Android光线传感器-android学习之旅(65)

主要讲解光线传感器的使用,其实所有的传感器用法类似

主要是定义一个TextView用来显示光线强度,用完了以后记得在OnDestory里面释放资源

代码如下

public class MainActivity extends Activity {
private SensorManager sensorManager;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
sensorManager.registerListener(sensorEventListener,sensor,SensorManager.SENSOR_DELAY_NORMAL);
}
private SensorEventListener sensorEventListener = new SensorEventListener() {
@Override
public void onSensorChanged(SensorEvent sensorEvent) {
float value = sensorEvent.values[0];
textView.setText("光线强度是"+value+"勒克斯");
}

@Override
public void onAccuracyChanged(Sensor sensor, int i) {

}
};
@Override
protected void onDestroy() {
if (sensorManager != null){
sensorManager.unregisterListener(sensorEventListener);
}
super.onDestroy();
}