1. 传感器的介绍
最近有个需求是改造zxing的二维码扫描需求，其中开启闪光灯功能是根据当前环境的状态去打开闪光灯。
所谓的传感器就是根据手机的物理改变或者收到外界干扰所做出的反映，如光线传感器就是手机硬件根据外界的光线去做不同的变化，传感器大概可以分三种
运动传感器环境传感器位置传感器
具体参考官网介绍：https://developer./guide/topics/sensors/sensors_overview
1. 光线传感器的使用
package com.phone.test_sensors;import android.content.Context;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import java.util.List;public class MainActivity extends AppCompatActivity implements SensorEventListener{SensorManager sensorManager;Sensor lightSensor;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//1.获取传感器管理服务sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);// 2.获取手机支持的传感器列表集合List<Sensor> sensorList = sensorManager.getSensorList(Sensor.TYPE_ALL);for (Sensor sensor : sensorList) {Log.e("TAG", "==============="+sensor);}// 3.获取光线传感器lightSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);}@Overrideprotected void onResume() {super.onResume();// 4.注册传感器if(sensorManager!=null) {// 参数1监听接口// 参数2获取的传感器// 参数3接收事件的频率 SENSOR_DELAY_UI>SENSOR_DELAY_NORMAL>SENSOR_DELAY_GAME>SENSOR_DELAY_FASTESTsensorManager.registerListener(this,lightSensor,SensorManager.SENSOR_DELAY_NORMAL);}}// 当传感器接受的事件的时候@Overridepublic void onSensorChanged(SensorEvent event) {float[] values = event.values;Log.e("TAG", "当前亮度==============="+values[0]);}// 当注册传感器的精度改变时调用@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {}@Overrideprotected void onPause() {super.onPause();// 5.取消注册if(sensorManager!=null){sensorManager.unregisterListener(this);}}}
LOG日志如下
05-16 19:01:00.238 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============10.005-16 19:01:00.727 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============225.005-16 19:01:01.216 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============294.005-16 19:01:01.704 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============296.005-16 19:01:02.192 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============294.005-16 19:01:02.679 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============121.005-16 19:01:03.168 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============294.005-16 19:01:03.658 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============294.005-16 19:01:04.145 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============296.005-16 19:01:04.633 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============296.005-16 19:01:05.121 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============296.005-16 19:01:05.609 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============292.005-16 19:01:06.098 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============294.005-16 19:01:06.586 5946-5946/com.phone.test_sensors E/TAG: 当前亮度===============296.0
