I am trying to move multiple ImageViews attached to the WindowManager but
after adding three views, the movement becomes very choppy.
After some investigation I think this is caused by calling updateViewLayout
too many times and on different views.
The code below is a simplified version of what I am trying to do and
illustrates the problem.
public class MainActivity extends AppCompatActivity {
WindowManager windowManager;
ArrayList<ImageView> imageViews = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
windowManager =
(WindowManager)this.getSystemService(Context.WINDOW_SERVICE);
addImageView();
addImageView();
addImageView();
addImageView();
addImageView();
}
private void addImageView() {
final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_PHONE,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT);
params.gravity = Gravity.TOP | Gravity.START;
ImageView imageView = new ImageView(this);
imageView.setImageResource(R.mipmap.ic_launcher);
imageView.setOnTouchListener(new ImageViewTouchListener());
imageViews.add(imageView);
windowManager.addView(imageView, params);
}
private class ImageViewTouchListener implements View.OnTouchListener {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_MOVE:
for(ImageView imageView : imageViews) {
WindowManager.LayoutParams params =
(WindowManager.LayoutParams)imageView.getLayoutParams();
params.x = (int)event.getRawX();
params.y = (int)event.getRawY();
windowManager.updateViewLayout(imageView, params);
}
return true;
}
return false;
}
}
}
As you can see, I am adding three ImageViews in onCreate, and each
ImageView has a TouchListener that updates the layout of every bubble in
ACTION_MOVE.
When adding one or two ImageViews, the movement is fluid, but three or more
and it lags badly.
Anyone have any ideas? Thank you very much!
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