final LinearLayout rootView = (LinearLayout) findViewById(R.id.rootView);    rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {        @Override        public void onGlobalLayout() {            int heightDiff = rootView.getRootView().getHeight() - rootView.getHeight();            if (heightDiff > DensityUtil.dp2px(ChatActivity.this, 200)) { //如果view的高度大于200dp,那么很有可能就是键盘                isKeyboardVisible = true;            } else {                isKeyboardVisible = false;            }        }    });  复制代码