同时监听多个Button事件

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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    tools:context="com.example.administrator.myapplication7777.MainActivity">    <Button        android:id="@+id/but1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button1" />    <Button        android:id="@+id/but2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button2" />    <Button        android:id="@+id/but3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button3"        android:onClick="Btn3OnClick"/></LinearLayout>

package com.example.administrator.myapplication7777;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main);        //第一种方法        Button Btn1=(Button)findViewById(R.id.but1);         Button Btn2=(Button)findViewById(R.id.but2);        Button Btn3=(Button)findViewById(R.id.but3);        Btn1.setOnClickListener(Listener);        Btn2.setOnClickListener(Listener);        Btn3.setOnClickListener(Listener);    }    private OnClickListener Listener =new OnClickListener() {        @Override        public void onClick(View v) {            Button btn=(Button)v;            switch (btn.getId())            {                case R.id.but1:                    Toast.makeText(MainActivity.this,"你点击了1按扭",Toast.LENGTH_LONG).show();                 break;                case R.id.but2:                    Toast.makeText(MainActivity.this,"你点击了2按扭",Toast.LENGTH_LONG).show();                    break;                case R.id.but3:                    Toast.makeText(MainActivity.this,"你点击了3按扭",Toast.LENGTH_LONG).show();                    break;            }        }    };}

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