1 package a.a; 2  3 import android.app.Activity; 4 import android.os.Bundle; 5 import android.view.View; 6 import android.widget.Button; 7 import android.widget.EditText; 8  9 public class AActivity extends Activity {10     /** Called when the activity is first created. */11 12     EditText Ev1;13 14     @Override15     public void onCreate(Bundle savedInstanceState) {16         super.onCreate(savedInstanceState);17         setContentView(R.layout.main);18 19         Ev1 = (EditText)findViewById(R.id.editText1);  20 21         //第一种方式  22         Button Btn1 = (Button)findViewById(R.id.button1);//获取按钮资源  23         Btn1.setOnClickListener(new Button.OnClickListener(){//创建监听  24             public void onClick(View v) {  25                 String strTmp = "点击Button01";  26                 Ev1.setText(strTmp);  27             }  28 29         });  30 31         //第二种方式  32         Button Btn2 = (Button) findViewById(R.id.button2);//获取按钮资源  33         Btn2.setOnClickListener(listener);//设置监听  34 35     }36 37     Button.OnClickListener listener = new Button.OnClickListener(){//创建监听对象  38         public void onClick(View v){  39             String strTmp="点击Button02";  40             Ev1.setText(strTmp);  41         }  42 43     };44 45 46     //第三种方式(Android1.6版本及以后的版本中提供了)  47     public void Btn3OnClick(View view){  48         String strTmp="点击Button03";49         Ev1.setText(strTmp);50 51     }  52 }

 1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3     android:layout_width="fill_parent" 4     android:layout_height="fill_parent" 5     android:orientation="vertical" > 6  7     <TextView 8         android:layout_width="fill_parent" 9         android:layout_height="wrap_content"10         android:text="@string/hello" />11 12     <Button13         android:id="@+id/button1"14         android:layout_width="wrap_content"15         android:layout_height="wrap_content"16         android:text="Button1" />17 18     <Button19         android:id="@+id/button2"20         android:layout_width="wrap_content"21         android:layout_height="wrap_content"22         android:text="Button2" />23     24  <Button25         android:id="@+id/button3"26         android:layout_width="wrap_content"27         android:layout_height="wrap_content"28         android:text="Button3" 29         android:onClick="Btn3OnClick"/>30 31  <EditText32      android:id="@+id/editText1"33      android:layout_width="match_parent"34      android:layout_height="wrap_content" >35 36      <requestFocus />37  </EditText>38 39 </LinearLayout>