 private static final int TAKE_PICTURE_FROM_ALBUM = 1; 
 private void takePictureFromAlbum() { 
  Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
  intent.setType("image/*"); 
  startActivityForResult(intent, TAKE_PICTURE_FROM_ALBUM); 
 }

2. 通過startAcitivityForResult()方法，我們可以在onAcitivityResult()中來獲取圖片的URI，然后將圖片的URI傳遞給圖片裁剪函數(shù)，代碼如下：

 @Override 
 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
  if (resultCode == Activity.RESULT_OK) { 
   switch (requestCode) { 
   case TAKE_PICTURE_FROM_ALBUM: 
    if (data != null) { 
     cropPictureFromAlbum(data.getData()); 
    } 
    break; 
   case PICTURE_CROP_CODE: 
    if (data != null) { 
     // 這是裁剪后圖片的bitmap 
     Bitmap bitmap = data.getParcelableExtra("data"); 
    } 
    break; 
   default: 
    break; 
   } 
  } 
 } 
  
 private static final int TAKE_PICTURE_FROM_ALBUM = 1; 
  
 private void takePictureFromAlbum() { 
  Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
  intent.setType("image/*"); 
  startActivityForResult(intent, TAKE_PICTURE_FROM_ALBUM); 
 } 
  
 private static final int PICTURE_CROP_CODE = 2; 
  
 private void cropPictureFromAlbum(Uri pictureUri) { 
  Intent intent = new Intent("com.android.camera.action.CROP"); 
  intent.setDataAndType(pictureUri, "image/*"); 
  intent.putExtra("crop", "true"); 
  // 裁剪框比例 
  intent.putExtra("aspectX", 1); 
  intent.putExtra("aspectY", 2); 
  
  // 裁剪后輸入圖片的尺寸大小 
  intent.putExtra("outputX", 300); 
  intent.putExtra("outputY", 300); 
  
  // 取消人臉識(shí)別 
  intent.putExtra("noFaceDetection", true); 
  
  intent.putExtra("return-data", true); 
  
  startActivityForResult(intent, PICTURE_CROP_CODE); 
 }

3. 在onActivityResult里，通過data.getParcelableExtra("data")可以獲取圖片裁剪之后的bitmap，之后就可以將bitmap賦值給圖片控件了。

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