Android自定义Button的OnKeyDown方法没反应

Question

代码如下：
自定义Button类
public class MyButton extends Button{
public MyButton(Context context,AttributeSet set) {
super(context,set);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    super.onKeyDown(keyCode,event);
    TextView tv = (TextView) findViewById(R.id.aa);
    tv.setText("123232323");
    Log.v("111","2222");
    return super.onKeyDown(keyCode, event);
}

}

界面xml代码：
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:orientation="vertical"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<TextView
    android:id="@+id/aa"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<com.example.cg.view.MyButton
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

Answer 1

public class ****Acticity extends Activity {
@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

MyButton mybutton = new MyButton(this);

mybutton.setFocusable(true);

setContentView(mybutton);

}
}

点击没效果，是因为Activity也有onKeyDown，你在view中设置了onKeyDown，点击时，系统不知道要响应哪一个。你给button添加一个焦点。