@Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   findViewById(R.id.add_picture).setOnClickListener(this);
   imageLayout = (DraggableImageLayout) findViewById(R.id.image_layout);
   imageLayout.setHoverView((ImageView) findViewById(R.id.hover_view));
   imageLayout.setScrollView((ScrollView) findViewById(R.id.scroll_view));
   imageLayout.setAddPictureView(findViewById(R.id.add_picture));
 }
  private void onImageTaken(Bitmap pBitmap) {
    if (pBitmap == null) {
      Toast.makeText(this, "image decode error", Toast.LENGTH_LONG).show();
      return;
    }
    DisplayMetrics dm = getResources().getDisplayMetrics();

    int width = dm.widthPixels;
    int height = pBitmap.getHeight() * dm.widthPixels / pBitmap.getWidth();

    ImageView imageView = new ImageView(this);
    imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
    imageView.setLayoutParams(new LinearLayout.LayoutParams(width, height));
    imageView.setImageBitmap(BitmapUtils.resizeBitmap(pBitmap, width, height));

    imageLayout.addView(imageView);
  }