android 监听键盘是否弹起，并根据键盘的弹起控制键盘显示关闭

直接撸码：
package com.example.administrator.keyboardapplication;import android.content.Context;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.inputmethod.InputMethodManager;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements View.OnLayoutChangeListener {    private View activityRootView;    private int screenHeight = 0;    private int keyHeight = 0;    private Button myButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        activityRootView = findViewById(R.id.root_layout);        screenHeight = this.getWindowManager().getDefaultDisplay().getHeight();        myButton = findViewById(R.id.button);        myButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);                imm.hideSoftInputFromWindow(myButton.getWindowToken(),0);            }        });        keyHeight = screenHeight/3;        activityRootView.addOnLayoutChangeListener(this);    }    @Override    public void onLayoutChange(View v, int left, int top, int right, int bottom,                               int oldLeft, int oldTop, int oldRight, int oldBottom) {        Log.i("iven","left:"+left+"\nright:"+right+"\ntop:"+top+"\nbottom:"+bottom);        Log.i("iven","oldleft:"+oldLeft+"\nOldright:"+oldRight+"\ntop:"+oldTop+"\nbottom:"+oldBottom);        //现在认为只要控件将Activity向上推的高度超过了1/3屏幕高，就认为软键盘弹起        if(oldBottom != 0 && bottom != 0 &&(oldBottom - bottom > keyHeight)){            Toast.makeText(MainActivity.this, "监听到软键盘弹起...", Toast.LENGTH_SHORT).show();        }else if(oldBottom != 0 && bottom != 0 &&(bottom - oldBottom > keyHeight)){            Toast.makeText(MainActivity.this, "监听到软件盘关闭...", Toast.LENGTH_SHORT).show();        }    }}
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