Android开发之onClick事件的三种写法

 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     @Override
15     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     <Button
13         android:id="@+id/button1"
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:text="Button1" />
17 
18     <Button
19         android:id="@+id/button2"
20         android:layout_width="wrap_content"
21         android:layout_height="wrap_content"
22         android:text="Button2" />
23     
24  <Button
25         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  <EditText
32      android:id="@+id/editText1"
33      android:layout_width="match_parent"
34      android:layout_height="wrap_content" >
35 
36      <requestFocus />
37  </EditText>
38 
39 </LinearLayout>