android传感器---光照

package com.yifei.myapplication;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView textView;
    SensorManager manager;
    Sensor sensor;
    private MySensorEventListener mySensorEventListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = findViewById(R.id.text);
        //得到传感器管理器实例
        manager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mySensorEventListener = new MySensorEventListener();
        if (manager != null) {
            //获取光照传感器实例
            sensor = manager.getDefaultSensor(Sensor.TYPE_LIGHT);
            if (sensor != null) {
                //注册光照传感器监听器
                manager.registerListener(mySensorEventListener, sensor, SensorManager.SENSOR_DELAY_NORMAL);
            }
        }


    }

    //监听器
    private class MySensorEventListener implements SensorEventListener {
        //当传感器的精度发送变化时通用的方法
        @Override
        public void onSensorChanged(SensorEvent event) {
            //光照传感器监听数值

            float value = event.values[0];//当values[]数组下标为0时,就是当前的光照强度
            Log.d("MainActivity12", "onSensorChanged: "+value);

        }

        //当传感器的精度发生变化式调用该方法
        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }
    }

    //activity销毁时,销毁传感器的监听器
    @Override
    protected void onDestroy() {
        super.onDestroy();
        manager.unregisterListener(mySensorEventListener);
    }
}