Question

报错textview cannot be cast to android.widget.linealayout，该怎么改xml

这是java代码：
public class MainActivity extends Activity{
private LinearLayout layout;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
layout = (LinearLayout) findViewById(R.id.LinearLayout01);

SensorManager sm = (SensorManager) getSystemService(SENSOR_SERVICE);

List<Sensor> allSensors = sm.getSensorList(Sensor.TYPE_ALL);

TextView text = new TextView(this); ;
text.setText("Sensors#：" + allSensors.size());
layout.addView(text);

TextView[] name = new TextView[allSensors.size()];
for (int i = 0;i < allSensors.size(); i++){
name[i] = new TextView(this);
name[i].setText((i + 1) + " : " + allSensors.get(i).getName());
layout.addView(name[i]);
}

}

}
然后xml编码是这样：

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:orientation="vertical">
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text=""
android:id="@+id/LinearLayout01"/>

</LinearLayout>
调试的时候总是报错。。。textview cannot be cast to android.widget.linealayout

Answer 1

layout = (LinearLayout) findViewById(R.id.LinearLayout01); 这句错了！
不知道你要干嘛？不过findViewById(R.id.LinearLayout01); 得到的是一个TextView，不能强制转换为LinearLayout

追问

啊 好像是 那要怎么改啊...就是想把手机的sensor list调出来啊

追答

用ListView来显示，上来搜一大把