光线传感器

1、修改activity_main.xml布局文件

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

2、修改MainActivity文件

package com.example.yxp.jxol;

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.view.Menu;
import android.view.MenuItem;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;

public class MainActivity extends Activity {
    private sensorListener listener;
    private SensorManager sensorManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);// 得到传感器
        Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);// 获得光线传感器

        listener = new sensorListener();
        sensorManager.registerListener(listener, sensor, sensorManager.SENSOR_DELAY_UI);
    }

    private class sensorListener implements SensorEventListener {

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }

        @Override
        public void onSensorChanged(SensorEvent event) {
            float lux = event.values[0];
            System.out.println("光线强度：" + lux);
        }

    }

    @Override
         protected void onDestroy() {
        super.onDestroy();
        sensorManager.unregisterListener(listener);
        listener=null;
    }
}

3、效果