android 传感器 操作代码
protected void onResume() {
super.onResume();
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_FASTEST);
x = new ValueHolder(ELEMENT_COUNT);
y = new ValueHolder(ELEMENT_COUNT);
z = new ValueHolder(ELEMENT_COUNT);
}