手机相册拍照、相册选取照片的裁剪代码,Java代码库,德仔网

代码语言
代码分类
【Java】手机相册拍照、相册选取照片的裁剪
作者:依依 / 发布于2016/3/15/ 546
之前项目中处理照片的逻辑以及相关处理可以直接对照片进行裁剪，支持被裁剪照片的放大缩小处理因为时间问题，没有加选择拍照和选择相册的popWindow，使用单一功能直接在SampleActivity中button的onClick事件切换可以解决在低端手机内存导致的图片无法裁剪的问题
package com.dingji.webpdemo;
 
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
 
/**
 * @author Almer Thie (code.almeros.com)
 *         Copyright (c) 2013, Almer Thie (code.almeros.com)
 *
 *         All rights reserved.
 *
 *         Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 *         following conditions are met:
 *
 *         Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 *         disclaimer.
 *         Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 *         disclaimer
 *         in the documentation and/or other materials provided with the distribution.
 *
 *         THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *         INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *         DISCLAIMED.
 *         IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *         EXEMPLARY,
 *         OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 *         OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *         LIABILITY,
 *         OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *         POSSIBILITY
 *         OF SUCH DAMAGE.
 */
public abstract class TwoFingerGestureDetector extends BaseGestureDetector {
 
    private final float mEdgeSlop;
    private float mRightSlopEdge;
    private float mBottomSlopEdge;
 
    protected float mPrevFingerDiffX;
    protected float mPrevFingerDiffY;
    protected float mCurrFingerDiffX;
    protected float mCurrFingerDiffY;
 
    private float mCurrLen;
    private float mPrevLen;
 
    public TwoFingerGestureDetector(Context context) {
        super(context);
 
        ViewConfiguration config = ViewConfiguration.get(context);
        mEdgeSlop = config.getScaledEdgeSlop();
    }
 
    @Override
    protected abstract void handleStartProgressEvent(int actionCode, MotionEvent event);
 
    @Override
    protected abstract void handleInProgressEvent(int actionCode, MotionEvent event);
 
    protected void updateStateByEvent(MotionEvent curr) {
        super.updateStateByEvent(curr);
 
        final MotionEvent prev = mPrevEvent;
 
        mCurrLen = -1;
        mPrevLen = -1;
 
        // Previous
        final float px0 = prev.getX(0);
        final float py0 = prev.getY(0);
        final float px1 = prev.getX(1);
        final float py1 = prev.getY(1);
        final float pvx = px1 - px0;
        final float pvy = py1 - py0;
        mPrevFingerDiffX = pvx;
        mPrevFingerDiffY = pvy;
 
        // Current
        final float cx0 = curr.getX(0);
        final float cy0 = curr.getY(0);
        final float cx1 = curr.getX(1);
        final float cy1 = curr.getY(1);
        final float cvx = cx1 - cx0;
        final float cvy = cy1 - cy0;
        mCurrFingerDiffX = cvx;
        mCurrFingerDiffY = cvy;
    }
 
    /**
     * Return the current distance between the two pointers forming the
     * gesture in progress.
     * 
     * @return Distance between pointers in pixels.
     */
    public float getCurrentSpan() {
        if (mCurrLen == -1) {
            final float cvx = mCurrFingerDiffX;
            final float cvy = mCurrFingerDiffY;
            mCurrLen = FloatMath.sqrt(cvx * cvx + cvy * cvy);
        }
        return mCurrLen;
    }
 
    /**
     * Return the previous distance between the two pointers forming the
     * gesture in progress.
     * 
     * @return Previous distance between pointers in pixels.
     */
    public float getPreviousSpan() {
        if (mPrevLen == -1) {
            final float pvx = mPrevFingerDiffX;
            final float pvy = mPrevFingerDiffY;
            mPrevLen = FloatMath.sqrt(pvx * pvx + pvy * pvy);
        }
        return mPrevLen;
    }
 
    /**
     * MotionEvent has no getRawX(int) method; simulate it pending future API approval.
     * 
     * @param event
     * @param pointerIndex
     * @return
     */
    protected static float getRawX(MotionEvent event, int pointerIndex) {
        float offset = event.getX() - event.getRawX();
        if (pointerIndex < event.getPointerCount()) {
            return event.getX(pointerIndex) + offset;
        }
        return 0f;
    }
 
    /**
     * MotionEvent has no getRawY(int) method; simulate it pending future API approval.
     * 
     * @param event
     * @param pointerIndex
     * @return
     */
    protected static float getRawY(MotionEvent event, int pointerIndex) {
        float offset = event.getY() - event.getRawY();
        if (pointerIndex < event.getPointerCount()) {
            return event.getY(pointerIndex) + offset;
        }
        return 0f;
    }
 
    /**
     * Check if we have a sloppy gesture. Sloppy gestures can happen if the edge
     * of the user's hand is touching the screen, for example.
     * 
     * @param event
     * @return
     */
    protected boolean isSloppyGesture(MotionEvent event) {
        // As orientation can change, query the metrics in touch down
        DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();
        mRightSlopEdge = metrics.widthPixels - mEdgeSlop;
        mBottomSlopEdge = metrics.heightPixels - mEdgeSlop;
 
        final float edgeSlop = mEdgeSlop;
        final float rightSlop = mRightSlopEdge;
        final float bottomSlop = mBottomSlopEdge;
 
        final float x0 = event.getRawX();
        final float y0 = event.getRawY();
        final float x1 = getRawX(event, 1);
        final float y1 = getRawY(event, 1);
 
        boolean p0sloppy = x0 < edgeSlop || y0 < edgeSlop || x0 > rightSlop || y0 > bottomSlop;
        boolean p1sloppy = x1 < edgeSlop || y1 < edgeSlop || x1 > rightSlop || y1 > bottomSlop;
 
        if (p0sloppy && p1sloppy) {
            return true;
        } else if (p0sloppy) {
            return true;
        } else if (p1sloppy) {
            return true;
        }
        return false;
    }
 
}



ShoveGestureDetector.java

package com.dingji.webpdemo;
 
import android.content.Context;
import android.view.MotionEvent;
 
public class ShoveGestureDetector extends TwoFingerGestureDetector {
 
    /**
     * Listener which must be implemented which is used by ShoveGestureDetector
     * to perform callbacks to any implementing class which is registered to a
     * ShoveGestureDetector via the constructor.
     * 
     * @see ShoveGestureDetector.SimpleOnShoveGestureListener
     */
    public interface OnShoveGestureListener {
 
        public boolean onShove(ShoveGestureDetector detector);
 
        public boolean onShoveBegin(ShoveGestureDetector detector);
 
        public void onShoveEnd(ShoveGestureDetector detector);
    }
 
    /**
     * Helper class which may be extended and where the methods may be
     * implemented. This way it is not necessary to implement all methods
     * of OnShoveGestureListener.
     */
    public static class SimpleOnShoveGestureListener implements OnShoveGestureListener {
 
        public boolean onShove(ShoveGestureDetector detector) {
            return false;
        }
 
        public boolean onShoveBegin(ShoveGestureDetector detector) {
            return true;
        }
 
        public void onShoveEnd(ShoveGestureDetector detector) {
            // Do nothing, overridden implementation may be used
        }
    }
 
    private float mPrevAverageY;
    private float mCurrAverageY;
 
    private final OnShoveGestureListener mListener;
    private boolean mSloppyGesture;
 
    public ShoveGestureDetector(Context context, OnShoveGestureListener listener) {
        super(context);
        mListener = listener;
    }
 
    @Override
    protected void handleStartProgressEvent(int actionCode, MotionEvent event) {
        switch (actionCode) {
            case MotionEvent.ACTION_POINTER_DOWN:
                // At least the second finger is on screen now
 
                resetState(); // In case we missed an UP/CANCEL event
                mPrevEvent = MotionEvent.obtain(event);
                mTimeDelta = 0;
 
                updateStateByEvent(event);
 
                // See if we have a sloppy gesture
                mSloppyGesture = isSloppyGesture(event);
                if (!mSloppyGesture) {
                    // No, start gesture now
                    mGestureInProgress = mListener.onShoveBegin(this);
                }
                break;
 
            case MotionEvent.ACTION_MOVE:
                if (!mSloppyGesture) {
                    break;
                }
 
                // See if we still have a sloppy gesture
                mSloppyGesture = isSloppyGesture(event);
                if (!mSloppyGesture) {
                    // No, start normal gesture now
                    mGestureInProgress = mListener.onShoveBegin(this);
                }
 
                break;
 
            case MotionEvent.ACTION_POINTER_UP:
                if (!mSloppyGesture) {
                    break;
                }
 
                break;
        }
    }
 
    @Override
    protected void handleInProgressEvent(int actionCode, MotionEvent event) {
        switch (actionCode) {
            case MotionEvent.ACTION_POINTER_UP:
                // Gesture ended but
                updateStateByEvent(event);
 
                if (!mSloppyGesture) {
                    mListener.onShoveEnd(this);
                }
 
                resetState();
                break;
 
            case MotionEvent.ACTION_CANCEL:
                if (!mSloppyGesture) {
                    mListener.onShoveEnd(this);
                }
 
                resetState();
                break;
 
            case MotionEvent.ACTION_MOVE:
                updateStateByEvent(event);
 
                // Only accept the event if our relative pressure is within
                // a certain limit. This can help filter shaky data as a
                // finger is lifted. Also check that shove is meaningful.
                if (mCurrPressure / mPrevPressure > PRESSURE_THRESHOLD && Math.abs(getShovePixelsDelta()) > 0.5f) {
                    final boolean updatePrevious = mListener.onShove(this);
                    if (updatePrevious) {
                        mPrevEvent.recycle();
                        mPrevEvent = MotionEvent.obtain(event);
                    }
                }
                break;
        }
    }
 
    @Override
    protected void resetState() {
        super.resetState();
        mSloppyGesture = false;
        mPrevAverageY = 0.0f;
        mCurrAverageY = 0.0f;
    }
 
    @Override
    protected void updateStateByEvent(MotionEvent curr) {
        super.updateStateByEvent(curr);
 
        final MotionEvent prev = mPrevEvent;
        float py0 = prev.getY(0);
        float py1 = prev.getY(1);
        mPrevAverageY = (py0 + py1) / 2.0f;
 
        float cy0 = curr.getY(0);
        float cy1 = curr.getY(1);
        mCurrAverageY = (cy0 + cy1) / 2.0f;
    }
 
    @Override
    protected boolean isSloppyGesture(MotionEvent event) {
        boolean sloppy = super.isSloppyGesture(event);
        if (sloppy)
            return true;
 
        // If it's not traditionally sloppy, we check if the angle between fingers
        // is acceptable.
        double angle = Math.abs(Math.atan2(mCurrFingerDiffY, mCurrFingerDiffX));
        // about 20 degrees, left or right
        return !((0.0f < angle && angle < 0.35f) || 2.79f < angle && angle < Math.PI);
    }
 
    /**
     * Return the distance in pixels from the previous shove event to the current
     * event.
     * 
     * @return The current distance in pixels.
     */
    public float getShovePixelsDelta() {
        return mCurrAverageY - mPrevAverageY;
    }
}


SampleActivity.java

package com.dingji.webpdemo;
 
import java.io.File;
 
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
 
public class SampleActivity extends Activity {
 
    private ImageView imageView;
    private Button button;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        initViews();
    }
 
    private void initViews() {
        imageView = (ImageView) findViewById(R.id.iv_webp);
        button = (Button) findViewById(R.id.btn_view_webp);
        button.setOnClickListener(new View.OnClickListener() {
 
            public void onClick(View v) {
                choiceFromCamera();
                // choiceFromAlbum();
            }
        });
    }
 
    public void choiceFromCamera() {
 
        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            Toast.makeText(getApplicationContext(), "没有储存卡", 0).show();
            return;
        }
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        File out = new File(Environment.getExternalStorageDirectory(), "camera.jpg");
        Uri uri = Uri.fromFile(out);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        try {
            startActivityForResult(intent, 716);
        } catch (Exception exception) {
            Toast.makeText(getApplicationContext(), "相机出错", 0).show();
        }
    }
 
    public void choiceFromAlbum() {
        try {
            Intent localIntent = new Intent(Intent.ACTION_PICK);
            localIntent.setDataAndType(MediaStore.Images.Media.INTERNAL_CONTENT_URI, "image/*");
            startActivityForResult(localIntent, 714);
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(), "相册不可用", 0).show();
        }
    }
 
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 716) {
            String fileName = Environment.getExternalStorageDirectory() + "/camera.jpg";
            startCropImage(this, fileName, 320, 320);
        } else if (requestCode == 728) {
            if (data != null) {
                String path = data.getStringExtra(ClipPictureActivity.IMAGE_PATH);
                if (path == null) {
                    return;
                }
                imageView.setImageBitmap(BitmapFactory.decodeFile(path));
            }
        } else if (requestCode == 714) {
            if (data != null) {
                Uri uri = data.getData();
                String filePath;
                if (uri.toString().startsWith("file")) {
                    filePath = uri.getPath();
                    startCropImage(this, filePath, 320, 320);
                } else {
                    ContentResolver resolver = this.getContentResolver();
                    Cursor cursor = resolver.query(uri, null, null, null, null);
                    if (cursor != null) {
                        cursor.moveToFirst();
                        filePath = cursor.getString(cursor.getColumnIndex("_data"));
                        startCropImage(this, filePath, 320, 320);
                    }
                }
            }
        }
    }
 
    /**
     * 选择过照片之后，开始编辑图片，可以放大缩小图片
     * 
     * @param instance
     * @param imagePath
     */
    public static void startCropImage(Activity instance, String imagePath, int outputX, int outputY) {
 
        Intent intent = new Intent(instance, ClipPictureActivity.class);
        intent.putExtra(ClipPictureActivity.IMAGE_PATH, imagePath);
 
        intent.putExtra(ClipPictureActivity.ASPECT_X, 3);
        intent.putExtra(ClipPictureActivity.ASPECT_Y, 2);
        intent.putExtra(ClipPictureActivity.OUTPUT_X, outputX);
        intent.putExtra(ClipPictureActivity.OUTPUT_Y, outputY);
 
        instance.startActivityForResult(intent, 728);
    }
 
}




RotateGestureDetector.java 

package com.dingji.webpdemo;
 
import android.content.Context;
import android.view.MotionEvent;
 
public class RotateGestureDetector extends TwoFingerGestureDetector {
 
    /**
     * Listener which must be implemented which is used by RotateGestureDetector
     * to perform callbacks to any implementing class which is registered to a
     * RotateGestureDetector via the constructor.
     * 
     * @see RotateGestureDetector.SimpleOnRotateGestureListener
     */
    public interface OnRotateGestureListener {
 
        public boolean onRotate(RotateGestureDetector detector);
 
        public boolean onRotateBegin(RotateGestureDetector detector);
 
        public void onRotateEnd(RotateGestureDetector detector);
    }
 
    /**
     * Helper class which may be extended and where the methods may be
     * implemented. This way it is not necessary to implement all methods
     * of OnRotateGestureListener.
     */
    public static class SimpleOnRotateGestureListener implements OnRotateGestureListener {
 
        public boolean onRotate(RotateGestureDetector detector) {
            return false;
        }
 
        public boolean onRotateBegin(RotateGestureDetector detector) {
            return true;
        }
 
        public void onRotateEnd(RotateGestureDetector detector) {
            // Do nothing, overridden implementation may be used
        }
    }
 
    private final OnRotateGestureListener mListener;
    private boolean mSloppyGesture;
 
    public RotateGestureDetector(Context context, OnRotateGestureListener listener) {
        super(context);
        mListener = listener;
    }
 
    @Override
    protected void handleStartProgressEvent(int actionCode, MotionEvent event) {
        switch (actionCode) {
            case MotionEvent.ACTION_POINTER_DOWN:
                // At least the second finger is on screen now
 
                resetState(); // In case we missed an UP/CANCEL event
                mPrevEvent = MotionEvent.obtain(event);
                mTimeDelta = 0;
 
                updateStateByEvent(event);
 
                // See if we have a sloppy gesture
                mSloppyGesture = isSloppyGesture(event);
                if (!mSloppyGesture) {
                    // No, start gesture now
                    mGestureInProgress = mListener.onRotateBegin(this);
                }
                break;
 
            case MotionEvent.ACTION_MOVE:
                if (!mSloppyGesture) {
                    break;
                }
 
                // See if we still have a sloppy gesture
                mSloppyGesture = isSloppyGesture(event);
                if (!mSloppyGesture) {
                    // No, start normal gesture now
                    mGestureInProgress = mListener.onRotateBegin(this);
                }
 
                break;
 
            case MotionEvent.ACTION_POINTER_UP:
                if (!mSloppyGesture) {
                    break;
                }
 
                break;
        }
    }
 
    @Override
    protected void handleInProgressEvent(int actionCode, MotionEvent event) {
        switch (actionCode) {
            case MotionEvent.ACTION_POINTER_UP:
                // Gesture ended but
                updateStateByEvent(event);
 
                if (!mSloppyGesture) {
                    mListener.onRotateEnd(this);
                }
 
                resetState();
                break;
 
            case MotionEvent.ACTION_CANCEL:
                if (!mSloppyGesture) {
                    mListener.onRotateEnd(this);
                }
 
                resetState();
                break;
 
            case MotionEvent.ACTION_MOVE:
                updateStateByEvent(event);
 
                // Only accept the event if our relative pressure is within
                // a certain limit. This can help filter shaky data as a
                // finger is lifted.
                if (mCurrPressure / mPrevPressure > PRESSURE_THRESHOLD) {
                    final boolean updatePrevious = mListener.onRotate(this);
                    if (updatePrevious) {
                        mPrevEvent.recycle();
                        mPrevEvent = MotionEvent.obtain(event);
                    }
                }
                break;
        }
    }
 
    @Override
    protected void resetState() {
        super.resetState();
        mSloppyGesture = false;
    }
 
    /**
     * Return the rotation difference from the previous rotate event to the current
     * event.
     * 
     * @return The current rotation //difference in degrees.
     */
    public float getRotationDegreesDelta() {
        double diffRadians = Math.atan2(mPrevFingerDiffY, mPrevFingerDiffX) - Math.atan2(mCurrFingerDiffY, mCurrFingerDiffX);
        return (float) (diffRadians * 180 / Math.PI);
    }
}




MoveGestureDetector.java

package com.dingji.webpdemo;
 
import android.content.Context;
import android.graphics.PointF;
import android.view.MotionEvent;
 
public class MoveGestureDetector extends BaseGestureDetector {
 
    /**
     * Listener which must be implemented which is used by MoveGestureDetector
     * to perform callbacks to any implementing class which is registered to a
     * MoveGestureDetector via the constructor.
     * 
     * @see MoveGestureDetector.SimpleOnMoveGestureListener
     */
    public interface OnMoveGestureListener {
 
        public boolean onMove(MoveGestureDetector detector);
 
        public boolean onMoveBegin(MoveGestureDetector detector);
 
        public void onMoveEnd(MoveGestureDetector detector);
    }
 
    /**
     * Helper class which may be extended and where the methods may be
     * implemented. This way it is not necessary to implement all methods
     * of OnMoveGestureListener.
     */
    public static class SimpleOnMoveGestureListener implements OnMoveGestureListener {
 
        public boolean onMove(MoveGestureDetector detector) {
            return false;
        }
 
        public boolean onMoveBegin(MoveGestureDetector detector) {
            return true;
        }
 
        public void onMoveEnd(MoveGestureDetector detector) {
            // Do nothing, overridden implementation may be used
        }
    }
 
    private static final PointF FOCUS_DELTA_ZERO = new PointF();
 
    private final OnMoveGestureListener mListener;
 
    private PointF mCurrFocusInternal;
    private PointF mPrevFocusInternal;
    private PointF mFocusExternal = new PointF();
    private PointF mFocusDeltaExternal = new PointF();
 
    public MoveGestureDetector(Context context, OnMoveGestureListener listener) {
        super(context);
        mListener = listener;
    }
 
    @Override
    protected void handleStartProgressEvent(int actionCode, MotionEvent event) {
        switch (actionCode) {
            case MotionEvent.ACTION_DOWN:
                resetState(); // In case we missed an UP/CANCEL event
 
                mPrevEvent = MotionEvent.obtain(event);
                mTimeDelta = 0;
 
                updateStateByEvent(event);
                break;
 
            case MotionEvent.ACTION_MOVE:
                mGestureInProgress = mListener.onMoveBegin(this);
                break;
        }
    }
 
    @Override
    protected void handleInProgressEvent(int actionCode, MotionEvent event) {
        switch (actionCode) {
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                mListener.onMoveEnd(this);
                resetState();
                break;
 
            case MotionEvent.ACTION_MOVE:
                updateStateByEvent(event);
 
                // Only accept the event if our relative pressure is within
                // a certain limit. This can help filter shaky data as a
                // finger is lifted.
                if (mCurrPressure / mPrevPressure > PRESSURE_THRESHOLD) {
                    final boolean updatePrevious = mListener.onMove(this);
                    if (updatePrevious) {
                        mPrevEvent.recycle();
                        mPrevEvent = MotionEvent.obtain(event);
                    }
                }
                break;
        }
    }
 
    protected void updateStateByEvent(MotionEvent curr) {
        super.updateStateByEvent(curr);
 
        final MotionEvent prev = mPrevEvent;
 
        // Focus intenal
        mCurrFocusInternal = determineFocalPoint(curr);
        mPrevFocusInternal = determineFocalPoint(prev);
 
        // Focus external
        // - Prevent skipping of focus delta when a finger is added or removed
        boolean mSkipNextMoveEvent = prev.getPointerCount() != curr.getPointerCount();
        mFocusDeltaExternal = mSkipNextMoveEvent ? FOCUS_DELTA_ZERO
                : new PointF(mCurrFocusInternal.x - mPrevFocusInternal.x, mCurrFocusInternal.y - mPrevFocusInternal.y);
 
        // - Don't directly use mFocusInternal (or skipping will occur). Add
        // unskipped delta values to mFocusExternal instead.
        mFocusExternal.x += mFocusDeltaExternal.x;
        mFocusExternal.y += mFocusDeltaExternal.y;
    }
 
    /**
     * Determine (multi)finger focal point (a.k.a. center point between all
     * fingers)
     * 
     * @param MotionEvent
     *            e
     * @return PointF focal point
     */
    private PointF determineFocalPoint(MotionEvent e) {
        // Number of fingers on screen
        final int pCount = e.getPointerCount();
        float x = 0f;
        float y = 0f;
 
        for (int i = 0; i < pCount; i++) {
            x += e.getX(i);
            y += e.getY(i);
        }
 
        return new PointF(x / pCount, y / pCount);
    }
 
    public float getFocusX() {
        return mFocusExternal.x;
    }
 
    public float getFocusY() {
        return mFocusExternal.y;
    }
 
    public PointF getFocusDelta() {
        return mFocusDeltaExternal;
    }
}



MonitoredActivity.java 

package com.dingji.webpdemo;
 
import java.util.ArrayList;
 
import android.app.Activity;
import android.os.Bundle;
 
public class MonitoredActivity extends Activity {
 
    private final ArrayList<LifeCycleListener> mListeners = new ArrayList<LifeCycleListener>();
 
    public static interface LifeCycleListener {
 
        public void onActivityCreated(MonitoredActivity activity);
 
        public void onActivityDestroyed(MonitoredActivity activity);
 
        public void onActivityPaused(MonitoredActivity activity);
 
        public void onActivityResumed(MonitoredActivity activity);
 
        public void onActivityStarted(MonitoredActivity activity);
 
        public void onActivityStopped(MonitoredActivity activity);
    }
 
    public static class LifeCycleAdapter implements LifeCycleListener {
 
        public void onActivityCreated(MonitoredActivity activity) {
 
        }
 
        public void onActivityDestroyed(MonitoredActivity activity) {
 
        }
 
        public void onActivityPaused(MonitoredActivity activity) {
 
        }
 
        public void onActivityResumed(MonitoredActivity activity) {
 
        }
 
        public void onActivityStarted(MonitoredActivity activity) {
 
        }
 
        public void onActivityStopped(MonitoredActivity activity) {
 
        }
    }
 
    public void addLifeCycleListener(LifeCycleListener listener) {
 
        if (mListeners.contains(listener))
            return;
        mListeners.add(listener);
    }
 
    public void removeLifeCycleListener(LifeCycleListener listener) {
 
        mListeners.remove(listener);
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
 
        super.onCreate(savedInstanceState);
        for (LifeCycleListener listener : mListeners) {
            listener.onActivityCreated(this);
        }
    }
 
    @Override
    protected void onDestroy() {
 
        super.onDestroy();
        for (LifeCycleListener listener : mListeners) {
            listener.onActivityDestroyed(this);
        }
    }
 
    @Override
    protected void onStart() {
 
        super.onStart();
        for (LifeCycleListener listener : mListeners) {
            listener.onActivityStarted(this);
        }
    }
 
    @Override
    protected void onStop() {
 
        super.onStop();
        for (LifeCycleListener listener : mListeners) {
            listener.onActivityStopped(this);
        }
    }
}


ClipView.java 

package com.dingji.webpdemo;
 
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
 
public class ClipView extends View {
 
    private Paint mStrokePaint;
    private Paint mBroadStrokePaint;
    private Paint mGrayPaint;
    private int mLeft;
    private int mRight;
    private int mTop;
    private int mBottom;
 
    public ClipView(Context context) {
        super(context);
        init();
    }
 
    public ClipView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
 
    public ClipView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }
 
    private void init() {
        mGrayPaint = new Paint();
        mGrayPaint.setColor(0xaa000000);
 
        mStrokePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mStrokePaint.setColor(Color.WHITE);
        mStrokePaint.setStyle(Style.STROKE);
 
        mBroadStrokePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mBroadStrokePaint.setColor(Color.BLACK);
        mBroadStrokePaint.setStrokeWidth(3);
        mBroadStrokePaint.setStyle(Style.STROKE);
    }
 
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int width = this.getWidth();
        int height = this.getHeight();
        // top
        canvas.drawRect(0, 0, width, mTop, mGrayPaint);
        // left
        canvas.drawRect(0, mTop, mLeft, mBottom, mGrayPaint);
        // right
        canvas.drawRect(mRight, mTop, width, mBottom, mGrayPaint);
        // bottom
        canvas.drawRect(0, mBottom, width, height, mGrayPaint);
        // gray border
        canvas.drawRect(mLeft, mTop, mRight, mBottom, mBroadStrokePaint);
        canvas.drawRect(mLeft, mTop, mRight, mBottom, mStrokePaint);
    }
 
    /**
     * clip area
     * 
     * @return clip area
     */
    public Rect getClipRect() {
        return new Rect(mLeft, mTop, mRight, mBottom);
    }
 
    /**
     * 
     * @param left
     * @param top
     * @param right
     * @param bottom
     */
    public void setClipRect(int left, int top, int right, int bottom) {
        mLeft = left;
        mTop = top;
        mRight = right;
        mBottom = bottom;
    }
 
    /**
     * 
     * @param rect
     */
    public void setClipRect(Rect rect) {
        mLeft = rect.left;
        mTop = rect.top;
        mRight = rect.right;
        mBottom = rect.bottom;
    }
 
}




ClipPictureActivity.java 

package com.dingji.webpdemo;
 
import java.io.Closeable;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
 
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PointF;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.text.TextUtils;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.TextView;
import android.widget.Toast;
 
public class ClipPictureActivity extends MonitoredActivity implements OnTouchListener {
 
    private static final String TAG = "ClipPictureActivity";
    final int IMAGE_MAX_SIZE = 1024;
 
    public static final String IMAGE_PATH = "image-path";
    public static final String ASPECT_X = "aspectX";
    public static final String ASPECT_Y = "aspectY";
    public static final String OUTPUT_X = "outputX";
    public static final String OUTPUT_Y = "outputY";
    public static final String RETURN_DATA_AS_BITMAP = "data";
    public static final String ACTION_INLINE_DATA = "inline-data";
    public static final String RETURN_DATA = "return-data";
 
    private Bitmap.CompressFormat mOutputFormat = Bitmap.CompressFormat.JPEG;
 
    private ContentResolver mContentResolver;
    private final Handler mHandler = new Handler();
    private ImageView mSrcImage;
    private ClipView mClipview;
 
    private TextView sure;
    private TextView cancel;
 
    private int mAspectX;
    private int mAspectY;
    private int mOutputX;
    private int mOutputY;
    private String mImagePath;
    private Uri mSaveUri = null;
    private String mSavePath;
    private Bitmap mBitmap;
 
    private Rect mClipRect;
    private boolean isCreated;
    private int mImageViewWidth;
    private int mImageViewHeight;
 
    private Matrix mMatrix = new Matrix();
    private float mScaleFactor = .4f;
    private float mRotationDegrees = 0.f;
    private float mFocusX = 0.f;
    private float mFocusY = 0.f;
    private int mAlpha = 255;
    private int mImageHeight, mImageWidth;
 
    private ScaleGestureDetector mScaleDetector;
    private RotateGestureDetector mRotateDetector;
    private MoveGestureDetector mMoveDetector;
    private ShoveGestureDetector mShoveDetector;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.clip_layout);
        mContentResolver = getContentResolver();
        // Setup Gesture Detectors
        initGesture();
        initData();
        initViews();
    }
 
    private void initGesture() {
        mScaleDetector = new ScaleGestureDetector(getApplicationContext(), new ScaleListener());
        mRotateDetector = new RotateGestureDetector(getApplicationContext(), new RotateListener());
        mMoveDetector = new MoveGestureDetector(getApplicationContext(), new MoveListener());
        mShoveDetector = new ShoveGestureDetector(getApplicationContext(), new ShoveListener());
    }
 
    private void initData() {
        Intent intent = getIntent();
        Bundle extras = intent.getExtras();
        if (extras != null) {
            mOutputX = extras.getInt(OUTPUT_X, 512);
            mOutputY = extras.getInt(OUTPUT_Y, 512);
 
            mImagePath = extras.getString(IMAGE_PATH);
            if (extras.containsKey(ASPECT_X) && extras.get(ASPECT_X) instanceof Integer) {
 
                mAspectX = extras.getInt(ASPECT_X);
            } else {
 
                throw new IllegalArgumentException("aspect_x must be integer");
            }
            if (extras.containsKey(ASPECT_Y) && extras.get(ASPECT_Y) instanceof Integer) {
 
                mAspectY = extras.getInt(ASPECT_Y);
            } else {
 
                throw new IllegalArgumentException("aspect_y must be integer");
            }
 
            mBitmap = getBitmap(mImagePath);
 
            mSavePath = getSaveImagePath(mImagePath);
            mSaveUri = getImageUri(mSavePath);
        }
 
        if (mBitmap == null) {
            Log.d(TAG, "finish!!!");
            Toast.makeText(getApplicationContext(), "图片加载失败，不能进行图片裁剪！", Toast.LENGTH_LONG).show();
            finish();
            return;
        }
    }
 
    private String getSaveImagePath(String imagePath) {
        String sdcardRootPath = Environment.getExternalStorageDirectory().getPath();
        if (!TextUtils.isEmpty(imagePath)) {
            int len = imagePath.lastIndexOf("/");
            String fileName = imagePath.substring(len + 1);
            String[] file = fileName.split("\\.");
            if (file != null && file.length >= 2) {
                fileName = file[0] + "_clip" + "." + file[file.length - 1];
            } else {
                fileName = fileName + "_clip";
            }
            if (!imagePath.startsWith(sdcardRootPath) || imagePath.startsWith("/system")) {
                return sdcardRootPath + "/" + fileName;
            }
            return imagePath.substring(0, len + 1) + fileName;
 
        }
        return imagePath;
    }
 
    private void initViews() {
        mClipview = (ClipView) this.findViewById(R.id.clipview);
        mSrcImage = (ImageView) this.findViewById(R.id.src_pic);
        mSrcImage.setOnTouchListener(this);
        mSrcImage.setScaleType(ScaleType.MATRIX);
        mSrcImage.setImageBitmap(mBitmap);
        isCreated = true;
        mClipview.getViewTreeObserver().addOnPreDrawListener(new OnPreDrawListener() {
 
            public boolean onPreDraw() {
                if (isCreated) {
                    isCreated = false;
                    initClipRange();
                }
                return true;
            }
 
        });
 
        sure = (TextView) this.findViewById(R.id.edit_pic_sure_text);
        sure.setOnClickListener(new OnClickListener() {
 
            public void onClick(View v) {
                try {
                    onSaveClicked();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
 
        cancel = (TextView) this.findViewById(R.id.edit_pic_cancel_text);
        cancel.setOnClickListener(new OnClickListener() {
 
            public void onClick(View v) {
                finish();
            }
        });
        ImageView roteBtn = (ImageView) this.findViewById(R.id.edit_pic_rote_imageview);
        roteBtn.setOnClickListener(new OnClickListener() {
 
            @Override
            public void onClick(View v) {
                if (mRotationDegrees <= 0) {
                    mRotationDegrees = 270;
                } else {
                    mRotationDegrees -= 90;
                }
                setImageMatrix(mSrcImage);
            }
        });
    }
 
    @SuppressWarnings("deprecation")
    public boolean onTouch(View v, MotionEvent event) {
        mScaleDetector.onTouchEvent(event);
        // mRotateDetector.onTouchEvent(event);
        mMoveDetector.onTouchEvent(event);
        // mShoveDetector.onTouchEvent(event);
        ImageView view = (ImageView) v;
        setImageMatrix(view);
        view.setAlpha(mAlpha);
 
        return true; // indicate event was handled
    }
 
    private void setImageMatrix(ImageView view) {
        float scaledImageCenterX = (mImageWidth * mScaleFactor) / 2;
        float scaledImageCenterY = (mImageHeight * mScaleFactor) / 2;
        mMatrix.reset();
        mMatrix.postScale(mScaleFactor, mScaleFactor);
        mMatrix.postRotate(mRotationDegrees, scaledImageCenterX, scaledImageCenterY);
        mMatrix.postTranslate(mFocusX - scaledImageCenterX, mFocusY - scaledImageCenterY);
        view.setImageMatrix(mMatrix);
    }
 
    private void initClipRange() {
        mImageViewWidth = mClipview.getWidth();
        mImageViewHeight = mClipview.getHeight();
 
        int cx = mImageViewWidth / 2; // 中心点x。
        int cy = mImageViewHeight / 2; // 中心点y。
        int aw = mImageViewWidth - 100; // 从中心点向外扩充的长度。
 
        int ah = aw * mOutputY / mOutputX;
 
        int left = cx - aw / 2;
        int top = cy - ah / 2;
        int right = cx + aw / 2;
        int bottom = cy + ah / 2;
 
        mClipRect = new Rect(left, top, right, bottom);
        mClipview.setClipRect(mClipRect);
 
        mImageWidth = mBitmap.getWidth();
        mImageHeight = mBitmap.getHeight();
 
        int scaleValue = mImageWidth > mImageHeight ? mImageWidth : mImageHeight;
        int scaleDenominator = mClipRect.width() > mClipRect.height() ? mClipRect.width() : mClipRect.height();
        mScaleFactor = (float) scaleDenominator / scaleValue;
 
        mFocusX = (int) mImageViewWidth / 2;
        mFocusY = (int) mImageViewHeight / 2;
 
        setImageMatrix(mSrcImage);
    }
 
    /**
     * Draw the view into a bitmap.
     */
    private Bitmap getViewBitmap(View v) {
        v.clearFocus();
        v.setPressed(false);
 
        boolean willNotCache = v.willNotCacheDrawing();
        v.setWillNotCacheDrawing(false);
 
        // Reset the drawing cache background color to fully transparent
        // for the duration of this operation
        int color = v.getDrawingCacheBackgroundColor();
        v.setDrawingCacheBackgroundColor(0);
 
        if (color != 0) {
            v.destroyDrawingCache();
        }
        v.buildDrawingCache();
        Bitmap cacheBitmap = v.getDrawingCache();
        if (cacheBitmap == null) {
            return null;
        }
 
        Bitmap result = Bitmap.createBitmap(mOutputX, mOutputY, Config.ARGB_8888);
        Canvas canvas = new Canvas(result);
        Rect src = mClipview.getClipRect();
        Rect dst = new Rect(0, 0, mOutputX, mOutputY);
        canvas.drawBitmap(cacheBitmap, src, dst, new Paint());
        // Restore the view
        v.destroyDrawingCache();
        v.setWillNotCacheDrawing(willNotCache);
        v.setDrawingCacheBackgroundColor(color);
 
        return result;
    }
 
    private Uri getImageUri(String path) {
        if (!TextUtils.isEmpty(path)) {
            File file = new File(path);
            if (file != null) {
                return Uri.fromFile(file);
            }
        }
        return null;
    }
 
    private Bitmap getBitmap(String path) {
 
        Uri uri = getImageUri(path);
        InputStream in = null;
        try {
            if (uri != null) {
                in = mContentResolver.openInputStream(uri);
 
                // Decode image size
                BitmapFactory.Options o = new BitmapFactory.Options();
                o.inJustDecodeBounds = true;
 
                BitmapFactory.decodeStream(in, null, o);
                in.close();
 
                int scale = 1;
                if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) {
                    scale = (int) Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) Math.max(o.outHeight, o.outWidth))
                            / Math.log(0.5)));
                }
 
                BitmapFactory.Options o2 = new BitmapFactory.Options();
                o2.inSampleSize = scale;
                in = mContentResolver.openInputStream(uri);
                Bitmap b = BitmapFactory.decodeStream(in, null, o2);
                in.close();
 
                return b;
            }
        } catch (FileNotFoundException e) {
            Log.e(TAG, "file " + path + " not found");
        } catch (IOException e) {
            Log.e(TAG, "file " + path + " not found");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    boolean mSaving; // Whether the "save" button is already clicked.
 
    private void onSaveClicked() throws Exception {
        if (mSaving)
            return;
        mSaving = true;
 
        Bitmap croppedImage = getViewBitmap(mSrcImage);
 
        // Return the cropped image directly or save it to the specified URI.
        Bundle myExtras = getIntent().getExtras();
        if (myExtras != null && myExtras.getBoolean(RETURN_DATA)) {
            Bundle extras = new Bundle();
            extras.putParcelable(RETURN_DATA_AS_BITMAP, croppedImage);
            setResult(RESULT_OK, (new Intent()).setAction(ACTION_INLINE_DATA).putExtras(extras));
            finish();
        } else {
            final Bitmap b = croppedImage;
            startBackgroundJob(this, null, "正在保存图片。。。", new Runnable() {
 
                public void run() {
                    saveOutput(b);
                }
            }, mHandler);
        }
    }
 
    private static class BackgroundJob extends MonitoredActivity.LifeCycleAdapter implements Runnable {
 
        private final MonitoredActivity mActivity;
        private final ProgressDialog mDialog;
        private final Runnable mJob;
        private final Handler mHandler;
        private final Runnable mCleanupRunner = new Runnable() {
 
            public void run() {
 
                mActivity.removeLifeCycleListener(BackgroundJob.this);
                if (mDialog.getWindow() != null)
                    mDialog.dismiss();
            }
        };
 
        public BackgroundJob(MonitoredActivity activity, Runnable job, ProgressDialog dialog, Handler handler) {
 
            mActivity = activity;
            mDialog = dialog;
            mJob = job;
            mActivity.addLifeCycleListener(this);
            mHandler = handler;
        }
 
        public void run() {
 
            try {
                mJob.run();
            } finally {
                mHandler.post(mCleanupRunner);
            }
        }
 
        @Override
        public void onActivityDestroyed(MonitoredActivity activity) {
            // We get here only when the onDestroyed being called before
            // the mCleanupRunner. So, run it now and remove it from the queue
            mCleanupRunner.run();
            mHandler.removeCallbacks(mCleanupRunner);
        }
 
        @Override
        public void onActivityStopped(MonitoredActivity activity) {
 
            mDialog.hide();
        }
 
        @Override
        public void onActivityStarted(MonitoredActivity activity) {
 
            mDialog.show();
        }
    }
 
    public static void startBackgroundJob(MonitoredActivity activity, String title, String message, Runnable job, Handler handler) {
        // Make the progress dialog uncancelable, so that we can gurantee
        // the thread will be done before the activity getting destroyed.
        ProgressDialog dialog = ProgressDialog.show(activity, title, message, true, false);
        new Thread(new BackgroundJob(activity, job, dialog, handler)).start();
    }
 
    private void saveOutput(Bitmap croppedImage) {
        if (mSaveUri != null) {
            OutputStream outputStream = null;
            try {
                outputStream = mContentResolver.openOutputStream(mSaveUri);
                if (outputStream != null) {
                    croppedImage.compress(mOutputFormat, 90, outputStream);
                }
            } catch (IOException ex) {
 
                Log.e(TAG, "Cannot open file: " + mSaveUri, ex);
                setResult(RESULT_CANCELED);
                finish();
                return;
            } finally {
                closeSilently(outputStream);
            }
 
            Bundle extras = new Bundle();
            Intent intent = new Intent(mSaveUri.toString());
            intent.putExtras(extras);
            intent.putExtra(IMAGE_PATH, mSavePath);
            setResult(RESULT_OK, intent);
        } else {
 
            Log.e(TAG, "not defined image url");
        }
        croppedImage.recycle();
        finish();
    }
 
    public static void closeSilently(Closeable c) {
 
        if (c == null)
            return;
        try {
            c.close();
        } catch (Throwable t) {
            // do nothing
        }
    }
 
    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
 
        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            mScaleFactor *= detector.getScaleFactor(); // scale change since
                                                        // previous event
 
            // Don't let the object get too small or too large.
            mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 10.0f));
 
            return true;
        }
    }
 
    private class RotateListener extends RotateGestureDetector.SimpleOnRotateGestureListener {
 
        @Override
        public boolean onRotate(RotateGestureDetector detector) {
            mRotationDegrees -= detector.getRotationDegreesDelta();
            return true;
        }
    }
 
    private class MoveListener extends MoveGestureDetector.SimpleOnMoveGestureListener {
 
        @Override
        public boolean onMove(MoveGestureDetector detector) {
            PointF d = detector.getFocusDelta();
            mFocusX += d.x;
            mFocusY += d.y;
 
            // mFocusX = detector.getFocusX();
            // mFocusY = detector.getFocusY();
            return true;
        }
    }
 
    private class ShoveListener extends ShoveGestureDetector.SimpleOnShoveGestureListener {
 
        @Override
        public boolean onShove(ShoveGestureDetector detector) {
            mAlpha += detector.getShovePixelsDelta();
            if (mAlpha > 255)
                mAlpha = 255;
            else if (mAlpha < 0)
                mAlpha = 0;
 
            return true;
        }
    }
}


BaseGestureDetector.java
package com.dingji.webpdemo;
 
import android.content.Context;
import android.view.MotionEvent;
 
public abstract class BaseGestureDetector {
 
    protected final Context mContext;
    protected boolean mGestureInProgress;
 
    protected MotionEvent mPrevEvent;
    protected MotionEvent mCurrEvent;
 
    protected float mCurrPressure;
    protected float mPrevPressure;
    protected long mTimeDelta;
 
    /**
     * This value is the threshold ratio between the previous combined pressure
     * and the current combined pressure. When pressure decreases rapidly
     * between events the position values can often be imprecise, as it usually
     * indicates that the user is in the process of lifting a pointer off of the
     * device. This value was tuned experimentally.
     */
    protected static final float PRESSURE_THRESHOLD = 0.67f;
 
    public BaseGestureDetector(Context context) {
        mContext = context;
    }
 
    /**
     * All gesture detectors need to be called through this method to be able to
     * detect gestures. This method delegates work to handler methods
     * (handleStartProgressEvent, handleInProgressEvent) implemented in
     * extending classes.
     * 
     * @param event
     * @return
     */
    public boolean onTouchEvent(MotionEvent event) {
        final int actionCode = event.getAction() & MotionEvent.ACTION_MASK;
        if (!mGestureInProgress) {
            handleStartProgressEvent(actionCode, event);
        } else {
            handleInProgressEvent(actionCode, event);
        }
        return true;
    }
 
    /**
     * Called when the current event occurred when NO gesture is in progress
     * yet. The handling in this implementation may set the gesture in progress
     * (via mGestureInProgress) or out of progress
     * 
     * @param actionCode
     * @param event
     */
    protected abstract void handleStartProgressEvent(int actionCode, MotionEvent event);
 
    /**
     * Called when the current event occurred when a gesture IS in progress. The
     * handling in this implementation may set the gesture out of progress (via
     * mGestureInProgress).
     * 
     * @param action
     * @param event
     */
    protected abstract void handleInProgressEvent(int actionCode, MotionEvent event);
 
    protected void updateStateByEvent(MotionEvent curr) {
        final MotionEvent prev = mPrevEvent;
 
        // Reset mCurrEvent
        if (mCurrEvent != null) {
            mCurrEvent.recycle();
            mCurrEvent = null;
        }
        mCurrEvent = MotionEvent.obtain(curr);
 
        // Delta time
        mTimeDelta = curr.getEventTime() - prev.getEventTime();
 
        // Pressure
        mCurrPressure = curr.getPressure(curr.getActionIndex());
        mPrevPressure = prev.getPressure(prev.getActionIndex());
    }
 
    protected void resetState() {
        if (mPrevEvent != null) {
            mPrevEvent.recycle();
            mPrevEvent = null;
        }
        if (mCurrEvent != null) {
            mCurrEvent.recycle();
            mCurrEvent = null;
        }
        mGestureInProgress = false;
    }
 
    /**
     * Returns {@code true} if a gesture is currently in progress.
     * 
     * @return {@code true} if a gesture is currently in progress, {@code false} otherwise.
     */
    public boolean isInProgress() {
        return mGestureInProgress;
    }
 
    /**
     * Return the time difference in milliseconds between the previous accepted
     * GestureDetector event and the current GestureDetector event.
     * 
     * @return Time difference since the last move event in milliseconds.
     */
    public long getTimeDelta() {
        return mTimeDelta;
    }
 
    /**
     * Return the event time of the current GestureDetector event being
     * processed.
     * 
     * @return Current GestureDetector event time in milliseconds.
     */
    public long getEventTime() {
        return mCurrEvent.getEventTime();
    }
}


clip_layout.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
 
    <RelativeLayout
        android:id="@+id/edit_pic_buttom_layout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        >
 
        <TextView
            android:id="@+id/edit_pic_cancel_text"
            android:layout_width="50dp"
            android:layout_height="match_parent"
            android:layout_alignParentLeft="true"
            android:layout_marginLeft="10dp"
            android:gravity="center"
            android:text="返回"
            android:textSize="18sp" />
 
        <TextView
            android:id="@+id/edit_pic_sure_text"
            android:layout_width="50dp"
            android:layout_height="match_parent"
            android:layout_alignParentRight="true"
            android:layout_marginRight="10dp"
            android:gravity="center"
            android:text="确定"
            android:textSize="18sp" />
 
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_toLeftOf="@id/edit_pic_sure_text"
            android:layout_toRightOf="@id/edit_pic_cancel_text" >
 
            <ImageView
                android:layout_width="0.4dp"
                android:layout_height="match_parent"
                android:layout_alignParentLeft="true"
                android:paddingBottom="10dp"
                android:paddingTop="10dp"
                />
 
            <ImageView
                android:layout_width="0.4dp"
                android:layout_height="match_parent"
                android:layout_alignParentRight="true"
                android:paddingBottom="10dp"
                android:paddingTop="10dp"
                 />
 
            <TextView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"
                android:text="可移动和缩放"
                android:textSize="18sp" />
        </RelativeLayout>
    </RelativeLayout>
 
    <FrameLayout
        android:id="@+id/edit_pic_frame_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/edit_pic_buttom_layout"
        android:layout_alignParentTop="true" >
 
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
 
            <ImageView
                android:id="@+id/src_pic"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="matrix" />
 
            <com.dingji.webpdemo.ClipView
                android:id="@+id/clipview"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
        </RelativeLayout>
 
        <ImageView
            android:id="@+id/edit_pic_rote_imageview"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:layout_gravity="top|right"
            android:layout_marginRight="10dp"
            android:layout_marginTop="10dp"
             />
    </FrameLayout>
 
</RelativeLayout>


main.xml 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <Button
        android:id="@+id/btn_view_webp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:text="@string/str_btn_view_webp" />
 
    <ImageView
        android:id="@+id/iv_webp"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scaleType="fitCenter"
        android:src="@drawable/ic_launcher" />
 
</LinearLayout>
试试其它关键字
　手机相册　　选取照片　
同语言下
可能有用的
依依贡献的其它代码(32)