在android 中利用button 按钮设置监听事件

新建一个空工程，然后当你点击button 按钮时，会提示你

<span style="color:#ff0000;">"TextView里的文字发生了改变,你注意到了吗?",  </span>

package com.example.androidtest;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.Button;import android.widget.Toast;import android.view.View;import android.widget.TextView; import android.view.View.OnClickListener;public class MainActivity extends Activity {private TextView textview1;      private Button button1;     @Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);    textview1 = (TextView)findViewById(R.id.textView1);      button1 = (Button)findViewById(R.id.button1);   button1=(Button)findViewById(R.id.button1);        //增加事件响应  button1.setOnClickListener(new Button.OnClickListener()        {               public void onClick(View v)              {                  //Toast提示控件                  Toast.makeText(MainActivity.this,                          "TextView里的文字发生了改变,你注意到了吗?",                           Toast.LENGTH_LONG).show();                  //将TextView的文字发生改变                  textview1.setText("欢迎你 前辈");                 // textview1.setText("你好，前辈");              }                  });       }@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

XML中的配置文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/textView1"        android:layout_marginTop="87dp"        android:layout_toRightOf="@+id/textView1"        android:text="Button test" />        </RelativeLayout>

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