光感传感器的使用demo

废话不多说，直接上代码。

import android.content.Context;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;public class MainActivity extends AppCompatActivity {private SensorManager sensorManager;    private SensorEventListener listener;    @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);        listener = new SensorEventListener() {            @Override            public void onSensorChanged(SensorEvent event) {                // values数组中第一个下标的值就是当前的光照强度                float value = event.values[0];                Log.e("光感强度:",value+"");//                lightLevel.setText("Current light level is " + value + " lx");            }            @Override            public void onAccuracyChanged(Sensor sensor, int accuracy) {            }        };        sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL);    }    @Override    protected void onDestroy() {        super.onDestroy();        if (sensorManager != null) {            sensorManager.unregisterListener(listener);        }    }
 }