1 @Override
 2     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 3         try {
 4             if (data != null) {
 5                 // 得到點(diǎn)擊圖片的uri
 6                 Uri uri = data.getData();
 7                 //原圖
 8                 Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
 9                 iv.setImageBitmap(bitmap);
10                 //原圖的拷貝
11                 Bitmap alterBitmap  = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight()-30, bitmap.getConfig());
12                 //以拷貝圖片的為模板創(chuàng)建一個(gè)畫布
13                 Canvas canvas = new Canvas(alterBitmap);
14                 Matrix matrix = new Matrix();
15 
16                 ColorMatrix cm = new ColorMatrix();
17 /*                cm.set(new float[] {
18                 1, 3, 0, 0, 0,
19                 0, 2, 0, 0, 0,
20                 0, 0, 3, 0, 0,
21                 0, 0, 0, 1, 0
22                 });*/
23                 cm.setSaturation(0.5f);
24 
25 
26                 
27                 
28                 Paint paint = new Paint();
29                 paint.setColorFilter(new ColorMatrixColorFilter(cm));
30                 
31                 paint.setAntiAlias(true);//在算法上 取消鋸齒
32                 canvas.drawBitmap(bitmap, matrix, paint);
33                 iv_copy.setImageBitmap(alterBitmap);
34             }
35         } catch (FileNotFoundException e) {
36             e.printStackTrace();
37         }
38         super.onActivityResult(requestCode, resultCode, data);
39     }