android Button控件的四种不同方法

1.使用setOnClickListener方法监听按钮消息

package Button.bt;

import java.security.PublicKey;

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

public class ButtonActivity extends Activity {
private Button myButton;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myButton = (Button)findViewById(R.id.mButton);
       myButton.setOnClickListener(new Button.OnClickListener()
        {
        public void onClick(View v)
        {
        // TODO Auto-generated method stub
        }
        });   
    }

2. 以内部类的形式构建按钮的监听器

package Button.bt;

import java.security.PublicKey;

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

public class ButtonActivity extends Activity {
private Button myButton;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myButton = (Button)findViewById(R.id.mButton);
     
    }

// 自定义myButton类，对按钮消息监听，内部类可以使用外部类的变量
    class myButtonListener implements OnClickListener
    {
     public void onClick(View v) 
         {
    // TODO Auto-generated method stub
    }
    }
}

3. 在xml布局文件中的代码如下：

<Button
android:id= "@+id/mButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button"
      android:onClick="bt"   //关键是这句
></Button>

java代码：

package Button.bt;

import java.security.PublicKey;

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

public class ButtonActivity extends Activity {
private Button myButton;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myButton = (Button)findViewById(R.id.mButton);
 
    }
    public void bt(View myButton)
    {
    // TODO Auto-generated method stub
    }
  
}

4.仔细观察后会发现，这种方法和第二种其实很相似。

package Button.bt;

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

public class ButtonActivity extends Activity {
private Button myButton;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myButton = (Button)findViewById(R.id.mButton);
        myButton.setOnClickListener (mListener);  
    }
    Button.OnClickListener mListener = new Button.OnClickListener()
    {
    public void onClick(View v)
    {
    // TODO Auto-generated method stub
    }
    };

}

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