实现一个view的监听的四种方法

方法一，用implements方法实现

 下面这段代码是实现Button的监听：

Javapackage com.listen;
import android.app.Activity;
import android.os.Bundle;
import android.util.Lg;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class EventListen1 extends Activity implements OnClickListener {//step2实现监听    
    /** Called when the activity is first created. */    
    @Override    
    public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            //step1,获取Button的id，设置监听
            //获取button01的id，并且设置监听        
            Button button01 = (Button)findViewById(R.id.button01);        
            button01.setOnClickListener(this);            
            }
            //step3,添加onClick方法， 
            @Override    
            public void onClick(View v) {        
            // TODO Auto-generated method stub                 
            Log.v("click..", "textview");                           
            }}  

xml代码如下：

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:orientation="vertical" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent">     
    <Button 
     android:id="@+id/button01" 
     android:layout_width="fill_parent"  
     android:layout_height="wrap_content"  
     android:text="点1实现监听" 
    />           
 </LinearLayout> 

运行结果：点击Button01，在logcat里面打印click...textview

方法二，用在xml中设置的方法实现

package com.listen;  
import android.app.Activity;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.TextView;  

public class EventListen1 extends Activity{  
/** Called when the activity is first created. */  
@Override  
public void onCreate(Bundle savedInstanceState) {  
         super.onCreate(savedInstanceState);  
         setContentView(R.layout.main);             
    }      

public void onClickButton(View v) {  
         // TODO Auto-generated method stub    
             Log.v("click..", "textview");  
           
    }  
 }

xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:id="@+id/textview"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:onClick="onClickButton"
    android:clickable="true" 
    android:text="@string/hello"
    />
    <Button
    android:id="@+id/button01"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:onClick="onClickButton"
    android:text="点1实现监听"
    />
</LinearLayout>

实现效果同上。

方法三：

在onCreate内部实现监听

package com.listen;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class EventListen1 extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button1 = (Button) findViewById(R.id.button1);
        /* 监听button1的事件信息 */
        button1.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.v("you click ", "button");
            }
        });
    
    }
    
}

xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

   <Button
    android:id="@+id/button1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="点我"/>
    
</LinearLayout>

方法四、在class内部，onCreate外部实现监听，

注意：插入的listener是：import android.view.View.OnClickListener

 

import android.app.Activity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import android.view.View.OnClickListener;

public class ActHelloAndroid extends Activity {
    /** Called when the activity is first created. */
    private EditText inname;
    private TextView outname;
    private Button button;
    private String TAG = "ActHelloAndroid";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button) findViewById(R.id.button);
        inname = (EditText) findViewById(R.id.edittext);
        outname = (TextView) findViewById(R.id.textview);

        button.setOnClickListener(listener);
        inname.setOnClickListener(listener);
        outname.setOnClickListener(listener);

    }

    private OnClickListener listener = new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (v.getId() == (R.id.textview)) {
                outname.setText(inname.getText() + "!" + "Welcome to Android");
            } else if (v.getId() == R.id.button) {
                outname.setText("你按了button！");
            } else {
                Log.v(TAG, "haha");
            }
        }

    };
}

xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<EditText
    android:id="@+id/edittext"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text=""
    />

<Button
    android:id="@+id/button"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Yes"
    />
<TextView
    android:id="@+id/textview"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:text="dd"
    />
</LinearLayout>

注意：当有多个view，需要点击button做出反应的时候，一定要每个view都绑定监听！！！！

效果图如图