SensorManager senserManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

Sensor sensor = senserManager.getDefaultSensor(Sensor.TYPE_LIGHT);

SensorEventListener listener = new SensorEventListener() {
  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    //当传感器精度发生变化时
  }
  @Override
  public void onSensorChanged(SensorEvent event) {
    //当传感器监测到的数值发生变化时
  }
};

senserManager.registerListener(listener, senser, SensorManager.SENSOR_ DELAY_NORMAL);

sensorManager.unregisterListener(listener);

package com.test.sensor.light;
import android.app.Activity;
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.widget.TextView;
public class MainActivity extends Activity {
  //感应器管理器
  private SensorManager sensorManager;
  //光线亮度
  private TextView light;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //当前Activity的内容是一个TextView
    light = new TextView(this);
    setContentView(light);
    //获得感应器服务
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    //获得光线感应器
    Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
    //注册监听器
    sensorManager.registerListener(listener, sensor, SensorManager. SENSOR_DELAY_NORMAL);
  }
  //Activity被销毁
  @Override
  protected void onDestroy() {
    super.onDestroy();
    //注销监听器
    if (sensorManager != null) {
      sensorManager.unregisterListener(listener);
    }
  }
  //感应器事件监听器
  private SensorEventListener listener = new SensorEventListener() {
    //当感应器精度发生变化
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
    //当传感器监测到的数值发生变化时
    @Override
    public void onSensorChanged(SensorEvent event) {
      // values数组中第一个值就是当前的光照强度
      float value = event.values[0];
      light.setText("当前亮度 " + value + " lx(勒克斯)");
    }
  };
}