请问作业中点击关闭wifi再打开之后如何让3个单选按钮全部显示未选中状态？

public class MainActivity extends Activity {

private ToggleButton on_Or_off;

private RadioGroup choose;

private ImageView imageView;

private RadioButton office,meeting,visitor;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

init();

on_Or_off.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

if (isChecked) {

choose.setVisibility(View.VISIBLE);

imageView.setVisibility(View.VISIBLE);

} else {

//直接用setSelected方法为什么没效果

office.setSelected(false);

meeting.setSelected(false);

visitor.setSelected(false);

choose.setVisibility(View.INVISIBLE);

imageView.setVisibility(View.INVISIBLE);

}

}

});

choose.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

switch (checkedId) {

case R.id.office:

imageView.setImageResource(R.drawable.office);

break;

case R.id.meeting:

imageView.setImageResource(R.drawable.meeting);

break;

case R.id.visitor:

imageView.setImageResource(R.drawable.visitor);

break;

}

}

});

}

private void init() {

on_Or_off = (ToggleButton) findViewById(R.id.openwifi);

choose = (RadioGroup) findViewById(R.id.choosewifi);

imageView = (ImageView) findViewById(R.id.image_display);

office=(RadioButton) findViewById(R.id.office);

meeting=(RadioButton) findViewById(R.id.meeting);

visitor=(RadioButton) findViewById(R.id.visitor);

}

}