Android监听软键盘状态

监听软键盘隐藏或显示，代码如下：

/**
 * 监听软键盘状态
 */
private void listenerInput() {
    final LinearLayout ll_main = (LinearLayout) findViewById(R.id.activity_main);

    ll_main.getViewTreeObserver().addOnGlobalLayoutListener(
            new ViewTreeObserver.OnGlobalLayoutListener() {
                @Override
                public void onGlobalLayout() {
                    Rect rect = new Rect();
                    ll_main.getWindowVisibleDisplayFrame(rect);
                    int rootInvisibleHeight = ll_main.getRootView().getHeight() - rect.bottom;
                    Log.d(TAG, "lin.getRootView().getHeight()=" + ll_main.getRootView().getHeight() +
                            ",rect.bottom=" + rect.bottom + ",rootInvisibleHeight=" + rootInvisibleHeight);
                    if (rootInvisibleHeight <= 100) {
                        //软键盘隐藏啦
                        Toast.makeText(MainActivity.this, "软键盘隐藏啦。。。。。。。",
                                Toast.LENGTH_SHORT).show();
                    } else {
                        //软键盘弹出啦
                        Toast.makeText(MainActivity.this, "软键盘弹出啦。。。。。。。",
                                Toast.LENGTH_SHORT).show();
                    }

                }
            });

}