title: Cannot remove a view attached by windowManager.addView()
body: <p>I'm trying to remove a layer added to WindowManager. But nothing happens when I call removeView().
  Does anybody know how to remove it? My code looks like this.</p>
  
  <pre><code>public class MainActivity extends Activity implements View.OnClickListener{
  
      private WindowManager wm;
      private  WindowManager.LayoutParams orientationLayout;
      private LinearLayout orientationChanger;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          // init landscape things
          wm = (WindowManager) getApplicationContext().getSystemService(Service.WINDOW_SERVICE);
          orientationChanger = new LinearLayout(getApplicationContext());
          orientationChanger.setClickable(false);
          orientationChanger.setFocusable(false);
          orientationChanger.setFocusableInTouchMode(false);
          orientationChanger.setLongClickable(false);
          orientationLayout = new WindowManager.LayoutParams(
                  WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT,
                  WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,
                  WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                          | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                  PixelFormat.RGBA_8888);
          orientationLayout.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
  
          // set view
          setContentView(R.layout.calibrate);
  
          findViewById(android.R.id.button).setOnClickListener(this);
  
          lockLandScape();
      }
  
      public void lockLandScape(){
          wm.addView(orientationChanger, orientationLayout);
  
          orientationChanger.setVisibility(View.GONE);
          orientationLayout.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
          wm.updateViewLayout(orientationChanger, orientationLayout);
          orientationChanger.setVisibility(View.VISIBLE);
      }
  
      public void releaseLandScape(){
          wm.removeView(orientationChanger);
  
          // This doesn't work as well
          //wm.removeViewImmediate(orientationChanger);
      }
  
      @Overrride
      public void onClick(View view){
          Log.i("myapp", "clicked")
          releaseLandScape();
      }
  
  }
  </code></pre>