锁屏壁纸demo代码,Java代码库,德仔网

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【Java】锁屏壁纸demo
作者:zhuxian9397 / 发布于2013/10/23/ 809
选取一张图片，在裁剪为指定大小后保存到某目录，删除裁剪后的图片及数据库，通过FileObserver监视壁纸文件的变动，更新壁纸

	package gp.yunfei.lockscreenwallpaper;

	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileOutputStream;
	import java.io.IOException;

	import android.app.Activity;
	import android.app.ProgressDialog;
	import android.content.ComponentName;
	import android.content.ContentResolver;
	import android.content.Intent;
	import android.database.Cursor;
	import android.graphics.drawable.Drawable;
	import android.net.Uri;
	import android.os.AsyncTask;
	import android.os.Bundle;
	import android.os.FileObserver;
	import android.os.Handler;
	import android.os.Message;
	import android.provider.MediaStore;
	import android.util.DisplayMetrics;
	import android.util.Log;
	import android.view.View;
	import android.widget.Toast;

	public class MainActivity extends Activity {
	private static final int GET_IMAGE = 0;
	private static final int CROP_IMAGE = 1;
	
	private static final String TAG = "LockWallpaper";
	private static final String LOCK_WALLPAPER = "lockwallpaper";
	
	private ProgressDialog mWaitDialog;
	private FileObserver mFileObserver;
	
	private View mView;
	Handler mHandler = new Handler() {

	 @Override
	 public void handleMessage(Message msg) {
	 setBackground();
	 }
	
	};
	
	 @Override
	 public void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	
	 mView = new View(this);
	 setContentView(mView);
	
	 mWaitDialog = new ProgressDialog(this);
	 mWaitDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
	 mWaitDialog.setMessage(getString(R.string.setting_lock));
	 mWaitDialog.setCancelable(false);
	
	 mFileObserver = new FileObserver(getFilesDir().getAbsolutePath()
	 + "/" + LOCK_WALLPAPER, FileObserver.CLOSE_WRITE) {
	
	 @Override
	 public void onEvent(int event, String path) {
	 Log.d("gptest", "file event " + event + ", path = " + path);
	 mHandler.sendEmptyMessage(1);
	 }
	 };
	
	 mFileObserver.startWatching();
	
	 String action = getIntent().getAction();
	
	 if (action.equals(Intent.ACTION_SET_WALLPAPER)) {
	 Intent request = new Intent(Intent.ACTION_GET_CONTENT);
	 request.setType("image/*");
	 startActivityForResult(request, GET_IMAGE);
	 } else if (action.equals(Intent.ACTION_ATTACH_DATA)) {
	 cropImage(getIntent().getData());
	 }
	 }

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	 if (resultCode == RESULT_CANCELED)
	 return;
	 if (requestCode == GET_IMAGE) {
	 cropImage(data.getData());
	 } else {
	 Uri uri = data.getData();
	 if (uri != null) {
	 setLockWallpaper(uri);
	 }
	 }
	}
	
	@Override
	protected void onDestroy() {
	 mFileObserver.stopWatching();
	 super.onDestroy();
	}

	private void cropImage(Uri uri) {
	 DisplayMetrics d = getResources().getDisplayMetrics();
	 int width = d.widthPixels;
	 int height = d.heightPixels;
	
	 Intent i = new Intent("com.android.camera.action.CROP");
	 ComponentName cn = new ComponentName("com.google.android.gallery3d",
	 "com.android.gallery3d.app.CropImage");
	
	 i.setComponent(cn)
	 .setDataAndType(uri, "image/*")
	 .putExtra("crop", "true")
	 .putExtra("outputX", width)
	 .putExtra("outputY", height)
	 .putExtra("aspectX", width)
	 .putExtra("aspectY", height)
	 .putExtra("scale", true)
	 .putExtra("scaleUpIfNeeded", true);
	
	 startActivityForResult(i, CROP_IMAGE);
	}
	
	private void setBackground() {
	 File f = new File(getFilesDir(), LOCK_WALLPAPER);
	 if (!f.exists())
	 return;
	
	 Drawable d = Drawable.createFromPath(f.getAbsolutePath());
	 mView.setBackgroundDrawable(d);
	}

	private void setLockWallpaper(final Uri uri) {
	 new AsyncTask<Void, Void, Boolean>() {
	
	 @Override
	 protected void onPreExecute() {
	 mWaitDialog.show();
	 }
	
	 @Override
	 protected void onPostExecute(Boolean result) {
	 mWaitDialog.dismiss();
	
	 if (!result)
	 Toast.makeText(MainActivity.this, "Set LockScreen Wallpaper failed!",
	 Toast.LENGTH_SHORT).show();
	 //else
	 //setBackground();
	 }
	
	 @Override
	 protected Boolean doInBackground(Void... arg0) {
	 ContentResolver cr = getContentResolver();
	 String[] projection = new String[] {MediaStore.Images.ImageColumns.DATA};
	 Cursor c = null;
	 FileInputStream fin = null;
	 FileOutputStream fos = null;
	 try {
	 c = cr.query(uri, projection, null, null, null);
	 if (c == null || c.getCount() <= 0)
	 return false;
	
	 c.moveToFirst();
	 File imageFile = new File(c.getString(0));
	 if (!imageFile.exists())
	 return false;
	
	 File wallpaperFile = new File(getFilesDir(), LOCK_WALLPAPER);
	 if (!wallpaperFile.exists()) {
	 if (!wallpaperFile.createNewFile()) {
	 return false;
	 }
	 }
	
	 fin = new FileInputStream(imageFile);
	 fos = new FileOutputStream(wallpaperFile);
	
	 byte[] buffer = new byte[32768];
	 int amt;
	 while ((amt=fin.read(buffer)) > 0) {
	 fos.write(buffer, 0, amt);
	 }
	
	 if (imageFile.delete()) {
	 cr.delete(uri, null, null);
	 }
	
	 } catch (Exception e) {
	 Log.d(TAG, "set lockwallpaper failed! ", e);
	 return false;
	 } finally {

	 try {
	 if (c != null)
	 c.close();

	 if (fin != null)
	 fin.close();

	 if (fos != null)
	 fos.close();
	 } catch (IOException e) {
	 }
	 }
	
	 return true;
	 }
	
	 }.execute();
	}
	}
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