Summary of Four Click Response Methods of Button_HTML/Xhtml_Web Page Production

Button is used a lot. I have sorted out its event handling methods here and found that there are many implementation methods. I prefer the second one. What about you, which one is the most commonly used?

Implementation 1:

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The code is as follows:

Button bt_Demo = (Button)findViewById(R .id.bt_Demo);
bt_Demo.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
//Response to Clicked event
//......
}
});

Implementation 2:

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The code is as follows:

Button bt_Demo = (Button)findViewById(R .id.bt_Demo);
bt_Demo.setOnClickListener(listener);
private OnClickListener listener = new OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch(arg0.getId()){
case R.id.bt_Demo:
//Response to Clicked event
//...
break ;
default:
break;
}
}
}

Implementation three:

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The code is as follows:

Button bt_Demo = (Button)findViewById(R .id.bt_Demo);
bt_Demo.setOnClickListener(new ButtonListener());
private class ButtonListener implements OnClickListener{
@Override
public void onClick(View arg0) {
//Response Clicked event
//......
}
}

Implementation Four:

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The code is as follows:

//Direct OnClickListener interface in Activity:
import android.view.View.OnClickListener;
public class MyActivity extends Activity implements OnClickListener {
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView (R.layout.main);
//Button
Button bt_Demo = (Button)findViewById(R.id.bt_Demo);
bt_Demo.setOnClickListener(this);
｝
//Response to Click event
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_Demo:
//Respond to Clicked event
/ /......
break;
default:
break;
}
}
｝

Thanks for such a comprehensive summary. Although I know all this, I lack a summary.