报错如下：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test2/com.example.test2.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
解决方法：
创建的activity是MainActivity extends ActionBarActivity这样的。把后面的ActionBarActivity改成Activity，然后导包，把下面报错的地方删掉运行就不报错了。。。
感应器在Android 1.5 API Level 3 使用了SensorEventListener 代替了SensorListener
而新的方法如下
private SensorEventListener sel = new SensorEventListener()
{
public void onSensorChanged(SensorEvent event)
{
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
{
event.values; //float[]保存了x,y,z
}
}
public void onAccuracyChanged(Sensor sensor, int accuracy){
}
};
Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sensorManager.registerListener(sel, sensor, SensorManager.SENSOR_DELAY_NORMAL);
