图片的放大旋转代码,Java代码库,德仔网

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【Java】图片的放大旋转
作者:嘉诚 / 发布于2016/4/6/ 582
package com.example.ejcker_llin.imageview;
 
import android.app.Activity;
 
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.SeekBar;
 
public class MainActivity extends Activity implements SeekBar.OnSeekBarChangeListener {
    private ImageView iv_one;
    private SeekBar sb_one;
    private SeekBar sb_two;
    private Matrix matrix;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv_one= (ImageView) findViewById(R.id.iv_pic);
        sb_one= (SeekBar) findViewById(R.id.sb_one);
        sb_two= (SeekBar) findViewById(R.id.sb_two);
        // 设置SeekBar的progress值改变监听事件
        sb_one.setOnSeekBarChangeListener(this);
        sb_two.setOnSeekBarChangeListener(this);
        matrix=new Matrix();
        // 获取屏幕的宽度
        DisplayMetrics dm=new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        // 设置seekBar的最大progress值
        sb_one.setMax(dm.widthPixels);
 
    }
 
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            switch (seekBar.getId()){
                case R.id.sb_one:// 放大或缩小
                    int width=progress;
                    int height=progress*3/4;
                    iv_one.setLayoutParams(new LinearLayout.LayoutParams(width, height));
                    break;
                case R.id.sb_two:// 旋转
                    matrix.setRotate(progress);// 设置旋转的度数
                    Bitmap bitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.pic)).getBitmap();
                    Bitmap newBitmap = bitmap.createBitmap(bitmap, 0, 0,
                            bitmap.getWidth(), bitmap.getHeight(), matrix, true);
                    iv_one.setImageBitmap(newBitmap);
                    break;
            }
    }
 
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
 
    }
 
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
 
    }
}




activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <ImageView
        android:id="@+id/iv_pic"
        android:layout_width="match_parent"
        android:layout_height="300dip"
        android:scaleType="fitCenter"
        android:src="@drawable/pic"
        />
 
    <SeekBar
        android:id="@+id/sb_one"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="拖放来缩放或者放大图片"
        />
    <SeekBar
        android:id="@+id/sb_two"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="拖放来旋转图片" />
</LinearLayout>
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