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); } } }