从位图加载图像时，Android imageView滞后

Question

我有一个带有触摸事件的imageView，可以移动，旋转和缩放图像视图。代码工作正常，但是当我从我的图库而不是从drawable文件夹加载图像时，触摸事件是滞后的。当我尝试移动，旋转或放大图像时，会出现延迟和缓慢。

 imgPhoto.setOnTouchListener(new View.OnTouchListener() {

        RelativeLayout.LayoutParams parms;
        int startwidth;
        int startheight;
        float dx = 0, dy = 0, x = 0, y = 0;
        float angle = 0;

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            final ImageView view = (ImageView) v;

            ((BitmapDrawable) view.getDrawable()).setAntiAlias(true);
            switch (event.getAction() & MotionEvent.ACTION_MASK) {
                case MotionEvent.ACTION_DOWN:
                    parms = (RelativeLayout.LayoutParams) view.getLayoutParams();
                    startwidth = parms.width;
                    startheight = parms.height;
                    dx = event.getRawX() - parms.leftMargin;
                    dy = event.getRawY() - parms.topMargin;
                    mode = DRAG;
                    break;
                case MotionEvent.ACTION_POINTER_DOWN:
                    oldDist = spacing(event);
                    if (oldDist > 10f) {
                        mode = ZOOM;
                    }
                    d = rotation(event);
                    break;
                case MotionEvent.ACTION_UP:
                    break;
                case MotionEvent.ACTION_POINTER_UP:
                    mode = NONE;
                    break;
                case MotionEvent.ACTION_MOVE:
                    if (mode == DRAG) {
                        x = event.getRawX();
                        y = event.getRawY();
                        parms.leftMargin = (int) (x - dx);
                        parms.topMargin = (int) (y - dy);
                        parms.rightMargin = 0;
                        parms.bottomMargin = 0;
                        parms.rightMargin = parms.leftMargin + (5 * parms.width);
                        parms.bottomMargin = parms.topMargin + (10 * parms.height);
                        view.setLayoutParams(parms);
                    } else if (mode == ZOOM) {
                        if (event.getPointerCount() == 2) {
                            newRot = rotation(event);
                            float r = newRot - d;
                            angle = r;
                            x = event.getRawX();
                            y = event.getRawY();
                            float newDist = spacing(event);
                            if (newDist > 10f) {
                                float scale = newDist / oldDist * view.getScaleX();
                                if (scale > 0.6) {
                                    scalediff = scale;
                                    view.setScaleX(scale);
                                    view.setScaleY(scale);

                                }
                            }
                            view.animate().rotationBy(angle).setDuration(0).setInterpolator(new LinearInterpolator()).start();

                            x = event.getRawX();
                            y = event.getRawY();

                            parms.leftMargin = (int) ((x - dx) + scalediff);
                            parms.topMargin = (int) ((y - dy) + scalediff);
                            parms.rightMargin = 0;
                            parms.bottomMargin = 0;
                            parms.rightMargin = parms.leftMargin + (5 * parms.width);
                            parms.bottomMargin = parms.topMargin + (10 * parms.height);
                            view.setLayoutParams(parms);
                        }
                    }
                    break;
            }
            return true;
        }
    });

从可绘制文件夹加载图像时，工作正常，如下所示

  android:src="@drawable/icon"

但是，如果我尝试从图库中加载图像，那么假设移动，旋转和缩放图像的触摸事件就会滞后。

这是我用来从图库加载图像并将图像设置为imageView的位图的代码。

            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);

以下是我将imageview设置为手机图像的代码。

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

    if(requestCode == PICK_IMAGE && resultCode == Activity.RESULT_OK) {
        Uri selectedImage = data.getData();
        try{
            InputStream imageStream = getActivity().getContentResolver().openInputStream(selectedImage);
            Bitmap yourSelectedImage = BitmapFactory.decodeStream(imageStream);
            imgPhoto.setImageBitmap(yourSelectedImage);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}