title: Display a view using windowmanager on lock screen
body: <p>I have a float icon that stays on top of all activities, but when the device get locked it disappear until the device get unlocked.</p>
  
  <p>Another meaning, I want to display a view (FloatIcon) on lock screen using windowmanager from service.</p>
  
  <p>This is my code so far.</p>
  
  <pre><code>public class FloatIcon extends Service {
  
      private WindowManager windowManager;
      private ImageView floatIcon;
  
      @Override
      public IBinder onBind(Intent intent) {
          return null;
      }
  
      @Override
      public void onCreate() {
          super.onCreate();
  
          windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
  
          floatIcon = new ImageView(this);
          floatIcon.setImageResource(R.drawable.ic_launcher);
          floatIcon.setClickable(true);
          floatIcon.setOnClickListener(new OnClickListener() {
              @Override
              public void onClick(View view) {
                  Intent intent = new Intent(getBaseContext(), MainActivity.class);
                  intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                  getApplication().startActivity(intent);
              }
          });
  
          final WindowManager.LayoutParams params = new WindowManager.LayoutParams(WindowManager.LayoutParams.WRAP_CONTENT,
              WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_PHONE,
              WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED + WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                      + WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT);
  
          params.gravity = Gravity.TOP | Gravity.LEFT;
          params.x = 0;
          params.y = 100;
  
          windowManager.addView(floatIcon, params);
  
      }
  
      @Override
      public void onDestroy() {
          super.onDestroy();
          if (floatIcon != null)
              windowManager.removeView(floatIcon);
      }
  }
  </code></pre>
  
  <p>I could not get something useful when I google it.</p>