Implementation code for monitoring soft keyboard display status in Android

/**监听软键盘状态
   * @param activity
   * @param listener
   */
  public static void addOnSoftKeyBoardVisibleListener(Activity activity, final OnSoftKeyBoardVisibleListener listener) {
    final View decorView = activity.getWindow().getDecorView();
    decorView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
      @Override
      public void onGlobalLayout() {
        Rect rect = new Rect();
        decorView.getWindowVisibleDisplayFrame(rect);
        int displayHight = rect.bottom - rect.top;
        int hight = decorView.getHeight();
        boolean visible = (double) displayHight / hight < 0.8;
          
        Log.d(TAG, "DecorView display hight = " + displayHight);
        Log.d(TAG, "DecorView hight = " + hight);
        Log.d(TAG, "softkeyboard visible = " + visible);
  
        if(visible != sLastVisiable){
          listener.onSoftKeyBoardVisible(visible);
        }
        sLastVisiable = visible;
      }
    });
  }

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