bitmap - 我可以使用android默认裁剪功能在imageview中裁剪我的位图吗

Question

我想使用android默认裁剪功能来裁剪imageview中存在的位图，然后将该裁剪的位图设置为当前的imageview。这是我的代码，但它不起作用。需要帮助...

ImageView iv;
final int CROP_PIC_REQUEST_CODE = 1;
String path;
Uri getUri;
Bitmap bitmap;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    iv = (ImageView) findViewById(R.id.imageView);
    bitmap =     Bitmap.createBitmap(iv.getWidth(),iv.getHeight(),Bitmap.Config.RGB_565);

    Canvas canvas = new Canvas(bitmap);
    iv.draw(canvas);

    iv.setBackgroundResource(R.drawable.ally);

    // to get Uri of the imageview
    getUri = getImageUri(this, bitmap);

    //android cropping function
    doCrop();




    }

public void doCrop() {
    try {
        // cropping intent
        Intent cropIntent = new Intent("com.android.camera.action.CROP");
        // Set data and type 
        cropIntent.setDataAndType(getUri, "image/*");
        cropIntent.putExtra("crop", "true");
        cropIntent.putExtra("aspectX", 1);
        cropIntent.putExtra("aspectY", 1);
        cropIntent.putExtra("outputX", 128);
        cropIntent.putExtra("outputY", 128);
        cropIntent.putExtra("return-data", true);
        //start the activity for cropping
        startActivityForResult(cropIntent, CROP_PIC_REQUEST_CODE);
    }
    // respond to users whose devices do not support the crop action
    catch (ActivityNotFoundException anfe) {
        // display an error message
        String errorMessage = "Whoops - your device doesn't support the crop action!";
        Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
        toast.show();
    }
}
    public Uri getImageUri(Context inContext, Bitmap inImage) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
        path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
        return Uri.parse(path);
    }

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CROP_PIC_REQUEST_CODE) {
        if (data != null) {
            // get the returned data
            Bundle extras = data.getExtras();
            // get the cropped bitmap
            bitmap= extras.getParcelable("data");
            //set the bitmap to imageview
            iv.setImageBitmap(bitmap);
        }
    }
}