onclicklistener到底怎么用？

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.view.View;
 4 import android.widget.Button;
 5 import android.widget.TextView;
 6 
 7 /* 这里接口继承的方法是隶属于按钮BUTTON的，因此前面导入的头文件只需有BUTTON即可 */
 8 public class Hello_to_worldActivity extends Activity implements Button.OnClickListener {
 9     /** Called when the activity is first created. */
10     private Button btn_say_hello;
11     private TextView hello_world;
12 
13     @Override
14     public void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.main);
17         btn_say_hello = (Button) findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
18         hello_world = (TextView) findViewById(R.id.textView1);
19         btn_say_hello.setOnClickListener(this);// 由于该类继承了BUTTON的监听，
20     } // 因此设置监听的参数只需传本类的对象即可
21 
22     public void onClick(View v) {
23         // TODO Auto-generated method stub
24         hello_world.setText("dickren123!");// 抽象接口的内部方法的实现
25     }
26 }

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.view.View;
 4 import android.view.View.OnClickListener;/* 导入的头文件需要有view类监听 */
 5 import android.widget.Button;
 6 import android.widget.TextView;
 7 
 8 public class Hello_to_worldActivity extends Activity implements OnClickListener {
 9     /** Called when the activity is first created. */
10     private Button btn_say_hello;
11     private TextView hello_world;
12 
13     @Override
14     public void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.main);
17         btn_say_hello = (Button) findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
18         hello_world = (TextView) findViewById(R.id.textView1);
19         btn_say_hello.setOnClickListener(this);// 由于该类继承了view的监听，
20     } // 因此设置监听的参数只需传本类的对象即可
21 
22     public void onClick(View v) {
23         // TODO Auto-generated method stub
24         hello_world.setText("dickren123!");// 抽象接口的内部方法的实现
25     }
26 }  

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.view.View;
 4 import android.widget.Button;
 5 import android.widget.TextView;
 6 
 7 public class Hello_to_worldActivity extends Activity {
 8     /** Called when the activity is first created. */
 9     private Button btn_say_hello;
10     private TextView hello_world;
11 
12     @Override
13     public void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.main);
16         btn_say_hello = (Button) findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
17         hello_world = (TextView) findViewById(R.id.textView1);
18         btn_say_hello.setOnClickListener(new Button.OnClickListener() {
19             public void onClick(View v) { // 使用匿名的Button实例
20                 // TODO Auto-generated method stub
21                 hello_world.setText("dickren123!");// 抽象接口的内部方法的实现
22             }
23         });
24     }
25 }

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.view.View;
 4 import android.widget.Button;
 5 
 6 public class Hello_to_worldActivity extends Activity {
 7     /** Called when the activity is first created. */
 8     private Button btn_say_hello;
 9 
10     @Override
11     public void onCreate(Bundle savedInstanceState) {
12         super.onCreate(savedInstanceState);
13         setContentView(R.layout.main);
14         btn_say_hello = (Button) findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
15         btn_listener bl = new btn_listener();
16         btn_say_hello.setOnClickListener(bl); // bl是类btn_listener的实例，而btn_listener为监听方法的接口
17     } // 因此设置监听的参数只需传本类的对象即可
18 }
19 
20 class btn_listener implements Button.OnClickListener {
21     public void onClick(View v) {
22         // TODO Auto-generated method stub
23 
24     }
25 }