本文实例为大家讲解如何轻松实现android指南针功能，分享给大家供大家参考。具体如下：
（1）布局文件如下：
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<?xml version="1.0" encoding="utf-8"?><linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:orientation="vertical" > <imageview android:id="@+id/imageview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/zn" /></linearlayout> |
所需图片：
（2）mainactivity.java
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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.animation.animation;import android.view.animation.rotateanimation;import android.widget.imageview;public class mainactivity extends activity { private imageview imageview; private sensormanager manager; private sensorlistener listener = new sensorlistener(); @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); imageview = (imageview) this.findviewbyid(r.id.imageview); imageview.setkeepscreenon(true); manager = (sensormanager) getsystemservice(context.sensor_service); } @override protected void onresume() { sensor sensor = manager.getdefaultsensor(sensor.type_orientation); manager.registerlistener(listener, sensor, sensormanager.sensor_delay_game); super.onresume(); } @override protected void onpause() { manager.unregisterlistener(listener); super.onpause(); } private final class sensorlistener implements sensoreventlistener { private float predegree = 0; public void onsensorchanged(sensorevent event) { float degree = event.values[0];// 存放了方向值 90 rotateanimation animation = new rotateanimation(predegree, -degree, animation.relative_to_self, 0.5f, animation.relative_to_self, 0.5f); animation.setduration(200); imageview.startanimation(animation); predegree = -degree; } public void onaccuracychanged(sensor sensor, int accuracy) { } }} |
效果如下：
希望本文所述对大家学习android软件编程有所帮助。
