Android 感測器之"光感測器"－魚的方舟圖形語言的世界 - LabVIEW & Arduino & Python工作室 - 新網站https://labview-tech.blogspot.com/

這一片篇介紹如何讀手機上的光感測器，

Android有關於環境感測器資料擷取，包含環境溫度、光、壓力、濕度，以及裝置溫度感測器，如下表所列：

Sensor	Sensor event data	Units of measure	Data description
`TYPE_AMBIENT_TEMPERATURE`	`event.values[0]`	°C	Ambient air temperature.
`TYPE_LIGHT`	`event.values[0]`	lx	Illuminance.
`TYPE_PRESSURE`	`event.values[0]`	hPa or mbar	Ambient air pressure.
`TYPE_RELATIVE_HUMIDITY`	`event.values[0]`	%	Ambient relative humidity.
`TYPE_TEMPERATURE`	`event.values[0]`	°C	Device temperature.¹

¹ Implementations vary from device to device. This sensor was deprecated in Android 4.0 (API Level 14).

以下為取得光感測器的Android code:

package com.example.light_sensor;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class LightSensorActivity extends Activity implements SensorEventListener{

   private SensorManager mysensorManager;
   private Sensor lsensor;
   private TextView lsensor_lx;
   private static final String TAG = "sensor";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_light_sensor);
        lsensor_lx = (TextView)this.findViewById(R.id.ls_lx);
        //Get an instance of the sensor service, and use that to get an instance of a particular sensor.
        mysensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        lsensor = mysensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);

    }
    @Override
    public final void onAccuracyChanged(Sensor sensor, int accuracy) {
      // Do something here if sensor accuracy changes.
    }

    @Override
    public final void onSensorChanged(SensorEvent event) {
      float light_value = event.values[0];
      // Do something with this sensor data.
      lsensor_lx.setText("Light:"+ String.valueOf(light_value)+"lux");
      Log.i(TAG,"\n lux" + light_value);
    }

    @Override
    protected void onResume() {
      // Register a listener for the sensor.
      super.onResume();
      mysensorManager.registerListener(this, lsensor, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
      // Be sure to unregister the sensor when the activity pauses.
      super.onPause();
      mysensorManager.unregisterListener(this);
    }
}

手機畫面：