光照传感器

package com.pingyijinren.test;

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.widget.TextView;

public class IndexActivity extends AppCompatActivity {
    private TextView textView;
    private SensorManager sensorManager;
    private Sensor sensor;
    private SensorEventListener sensorEventListener;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_index);

        textView=(TextView)findViewById(R.id.textView);
        sensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);
        sensor=sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
        sensorEventListener=new SensorEventListener() {
            @Override
            public void onSensorChanged(SensorEvent event) {
                textView.setText("光照发生改变，当前光照为"+event.values[0]);
            }

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

            }
        };
        sensorManager.registerListener(sensorEventListener,sensor,SensorManager.SENSOR_DELAY_NORMAL);
    }

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