Android 讀取加速度, 亮度, 接近等三種感應器

// 主程式: MainActivity.java

package com.example.mint.accelerometer;

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.widget.TextView;

public class MainActivity extends AppCompatActivity  implements SensorEventListener {
    SensorManager sensorMan;
    TextView textview;
    String accMeter, lightMeter, proximityMeter;
    public void onAccuracyChanged(Sensor arg0, int arg1) {
    }
    public void onSensorChanged(SensorEvent event) {
        switch( event.sensor.getType() ) {
            case Sensor.TYPE_ACCELEROMETER:
                accMeter = "\n加速感應器: x=" + event.values[0] + "    y=" + event.values[1] + "    z=" + event.values[2];
                break;
            case Sensor.TYPE_PROXIMITY:
                proximityMeter = "\n接近感應器:" + event.values[0];
                break;
            case Sensor.TYPE_LIGHT:
                lightMeter = "\n亮度感應器:" + event.values[0];
                break;
        }
        textview.setText(accMeter+proximityMeter+lightMeter);
    }
    @Override    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textview = (TextView)findViewById(R.id.meterInfo);
        sensorMan = (SensorManager) getSystemService(SENSOR_SERVICE);
    }
    protected void onResume() {
        super.onResume();
        sensorMan.registerListener(this, sensorMan.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
        sensorMan.registerListener(this, sensorMan.getDefaultSensor(Sensor.TYPE_PROXIMITY), SensorManager.SENSOR_DELAY_NORMAL);
        sensorMan.registerListener(this, sensorMan.getDefaultSensor(Sensor.TYPE_LIGHT), SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override    protected void onPause() {
        super.onPause();
        sensorMan.unregisterListener(this);
    }

}

// activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.mint.accelerometer.MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:id="@+id/meterInfo" />
</RelativeLayout>