一、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>
二、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);// 获得传感器
Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);// 得到光线传感器
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;
}
}
三、效果