Android 安卓限制布局测量看不到软键盘

好的，我正在尝试创建一个事件挂钩，当软键盘显示或隐藏时通知我

我将约束布局细分如下：

public class MyConstraintLayout extends ConstraintLayout
{
    //public static final String KEYBOARD_STATE = "KEYBOARD_STATE", SHOWN = "SHOWN", HIDDEN = "HIDDEN";
    public static final String ACTION_KEYBOARD_SHOWN = "KEYBOARD_SHOWN";
    public static final String ACTION_KEYBOARD_HIDDEN = "KEYBOARD_HIDDEN";
    private LocalBroadcastManager localBroadcastManager;
    private Intent keyboardShown, keyboardHidden;
    private boolean shown = false;

    public MyConstraintLayout(Context context)
    {
        super(context);
        init(context);
    }

    public MyConstraintLayout(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        init(context);
    }

    public MyConstraintLayout(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    private void init(Context context)
    {
        localBroadcastManager = LocalBroadcastManager.getInstance(context);
        keyboardShown = new Intent(ACTION_KEYBOARD_SHOWN);
        keyboardHidden = new Intent(ACTION_KEYBOARD_HIDDEN);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        //Log.d("Search Layout", "Handling Keyboard Window shown");
        final int proposedHeight = MeasureSpec.getSize(heightMeasureSpec);
        final int actualHeight = getHeight();

        Log.v("MyConstraintLayout", "onMeasure: actualHeight="+actualHeight+", proposedHeight="+proposedHeight);

        if(actualHeight > proposedHeight)
        {
            // Keyboard is shown
            if(!shown)
            {
                shown = true;
                localBroadcastManager.sendBroadcast(keyboardShown);
            }
        }
        else
        {
            // Keyboard is hidden
            if(shown)
            {
                shown = false;
                localBroadcastManager.sendBroadcast(keyboardHidden);
            }
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

但布局似乎根本看不到键盘，因为显示键盘时的日志输出与删除键盘时的日志输出完全相同。 以下是日志输出： 显示键盘时：

V/MyConstraintLayout: onMeasure: actualHeight=1120, proposedHeight=1280 V/MyConstraintLayout: onMeasure: actualHeight=1120, proposedHeight=1120 V/MyConstraintLayout:On测量：实际高度=1120，建议高度=1280 V/MyConstraintLayout:On测量：实际高度=1120，建议高度=1120 当键盘被隐藏时

V/MyConstraintLayout: onMeasure: actualHeight=1120, proposedHeight=1280 V/MyConstraintLayout: onMeasure: actualHeight=1120, proposedHeight=1120 V/MyConstraintLayout:On测量：实际高度=1120，建议高度=1280 V/MyConstraintLayout:On测量：实际高度=1120，建议高度=1120 我正在测试运行安卓6.0.1的三星J500f

所以我有两个问题：
1-为什么布局看不到键盘？
2-为什么在1120和1280之间以提议的高度触发两次事件

还要注意的是，在我将

android:windowSoftInputMode=“adjustPan”

添加到Manifest.xml之前，它已经触发了4次（仍然只是在相同的值之间切换）