Android:使用相机检测手机周围环境的亮度(光量)

Android: detect brightness (amount of light) in phone#39;s surroundings using the camera?(Android:使用相机检测手机周围环境的亮度(光量)?)

问题描述

以下适用于 Android 操作系统.

The following applies to the Android operating system.

我正在尝试使用摄像头估计手机所在房间的黑暗(或光亮).

I am trying to estimate how dark (or light) it is in the room where the phone is located using the camera.

这个想法是相机可以返回一定的亮度水平，我可以用它来确定手机周围的光量.

The idea is that the camera can return a certain brightness level, which I can use to determine the amount of light in the surroundings of the phone.

我的问题很简单:如何使用摄像头(无论是前置摄像头还是后置摄像头)来获得这样的亮度(光量")?

My question is simple: how do I use the camera (either the front of back camera) to get this amount of brightness (the "amount of light")?

提前致谢.

推荐答案

以下是在光传感器上注册监听器的方法:

Here is how you register a listener on the light sensor:

private final SensorManager mSensorManager;
private final Sensor mLightSensor;
private float mLightQuantity;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Obtain references to the SensorManager and the Light Sensor
    mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
    mLightSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);

    // Implement a listener to receive updates
    SensorEventListener listener = new SensorEventListener() {
        @Override
        public void onSensorChanged(SensorEvent event) {
            mLightQuantity = event.values[0];
        }
    }

    // Register the listener with the light sensor -- choosing
    // one of the SensorManager.SENSOR_DELAY_* constants.
    mSensorManager.registerListener(
            listener, lightSensor, SensorManager.SENSOR_DELAY_UI);
}

感谢@AntiMatter 提出的更新建议.

Thanks to @AntiMatter for the suggested updates.

文档:SensorEventListenerSensorManagerSensorEvent传感器

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