Android 给按钮绑定事件

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="46dp"
android:text="@string/button1" />

Button btn = (Button)findViewById(R.id.button1);

btn.setOnClickListener(listen);

Button btn = (Button)findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
EditText et = (EditText)findViewById(R.id.editText1);
et.setText("very good");
}

});

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button)findViewById(R.id.button1);btn.setOnClickListener(new MyButtonOnClickListener());
}

public class MyButtonOnClickListener implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
EditText et = (EditText)findViewById(R.id.editText1);
et.setText("very good");
}

}
}