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>
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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) {
}
}
}
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效果如下：
希望本文所述对大家学习android软件编程有所帮助。