介紹了給button設定click Listener的幾種寫法：

1：最簡單的是將處理該button點選事件的函式名字繫結到xml標籤上：

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
    android:onClick="handlerClick" />

然後在button所在的Activity裡面實現handlerClick()函式就可以了。

public void handlerClick(View v) {
        Toast.makeText(this, "haha 你點了button1", Toast.LENGTH_LONG).show();
    }

2：採用匿名內部類的方法,例項化OnClickListener()介面，作為形參傳給setOnClickListener()函式。

    button2.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
 

                Toast.makeText(MainActivity.this, "haha 你點了button2",
                        Toast.LENGTH_LONG).show();
            }

        });

這種寫法和下面的這種寫法的含義是一樣的。

    button2.setOnClickListener(listener);
    ...若干句程式碼之後
    OnClickListener listener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "haha 你點了button2"
 
,
                    Toast.LENGTH_LONG).show();
        }
    };

3：button所在的Activity實現OnClickListener介面，內部重寫OnClick函式。

public class MainActivity extends Activity implements OnClickListener{
    ...若干句程式碼之後
    button3.setOnClickListener(this);
    ...若干句程式碼之後
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if (v.getId() == R.id.button3) {
                Toast.makeText(this, "haha 你點了    button3",Toast.LENGTH_LONG).show();
        }
    }

}

4: 採用內部類的實現方式

public class MainActivity extends Activity implements OnClickListener{
    ...若干句程式碼之後
    button4.setOnClickListener(new MyClickListener());
    ...若干句程式碼之後
    class MyClickListener implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "haha 你點了button4",
                    Toast.LENGTH_LONG).show();
        }

    }

}

整個Demo如下所示：

package com.example.buttontest;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
    Button button1;
    Button button2;
    Button button3;
    Button button4;

    public void initView() {
        button1 = (Button) this.findViewById(R.id.button1);
        button2 = (Button) this.findViewById(R.id.button2);
        button3 = (Button) this.findViewById(R.id.button3);
        button4 = (Button) this.findViewById(R.id.button4);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

        button2.setOnClickListener(listener);
        button3.setOnClickListener(this);
        button4.setOnClickListener(new MyClickListener());
    }

    public void handlerClick(View v) {
        Toast.makeText(this, "haha 你點了button1", Toast.LENGTH_LONG).show();
    }

    OnClickListener listener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "haha 你點了button2",
                    Toast.LENGTH_LONG).show();
        }
    };

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if (v.getId() == R.id.button3) {
            Toast.makeText(this, "haha 你點了button3", Toast.LENGTH_LONG).show();
        }
    }

    class MyClickListener implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "haha 你點了button4",
                    Toast.LENGTH_LONG).show();
        }

    }
}

佈局檔案：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="handlerClick"
        android:text="繫結標籤的實現" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="匿名內部類的實現" />

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Activity作為監聽器" />

    <Button
        android:id="@+id/button4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="內部類的實現" />

</LinearLayout>