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);
        }}
 }

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