Summary of Button's four Click response methods

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

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:
//Respond to Clicked event
//......
break;
default:
break;
}
}
}

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) {
//Respond to Clicked event
//......
}
}

//Directly use the 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);
}
//Respond to Click event
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_Demo:
//Respond to Clicked event
//......
break;
default:
break;
}
}
}