Android(安卓)电子罗盘 --指南针（方向传感器的应用）

,图片神马的在网上搜个指南针图片就好了，本来没有注释，发上来之后感觉不行，还是加上吧，方便学习

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:gravity="center"    >    <ImageView        android:id="@+id/compass_imageView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/compass" /></LinearLayout>

compass.Activity

import android.app.Activity;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;/** * 电子罗盘 方向传感器 */public class ComPassActivity extends Activity implements SensorEventListener {private ImageView imageView;private float currentDegree = 0f;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.compass);imageView = (ImageView) findViewById(R.id.compass_imageView);// 传感器管理器SensorManager sm = (SensorManager) getSystemService(SENSOR_SERVICE);// 注册传感器(Sensor.TYPE_ORIENTATION(方向传感器);SENSOR_DELAY_FASTEST(0毫秒延迟);// SENSOR_DELAY_GAME(20,000毫秒延迟)、SENSOR_DELAY_UI(60,000毫秒延迟))sm.registerListener(ComPassActivity.this,sm.getDefaultSensor(Sensor.TYPE_ORIENTATION),SensorManager.SENSOR_DELAY_FASTEST);}//传感器报告新的值(方向改变)public void onSensorChanged(SensorEvent event) {if (event.sensor.getType() == Sensor.TYPE_ORIENTATION) {float degree = event.values[0];/*RotateAnimation类：旋转变化动画类 参数说明:fromDegrees：旋转的开始角度。toDegrees：旋转的结束角度。pivotXType：X轴的伸缩模式，可以取值为ABSOLUTE、RELATIVE_TO_SELF、RELATIVE_TO_PARENT。pivotXValue：X坐标的伸缩值。pivotYType：Y轴的伸缩模式，可以取值为ABSOLUTE、RELATIVE_TO_SELF、RELATIVE_TO_PARENT。pivotYValue：Y坐标的伸缩值*/RotateAnimation ra = new RotateAnimation(currentDegree, -degree,Animation.RELATIVE_TO_SELF, 0.5f,Animation.RELATIVE_TO_SELF, 0.5f);//旋转过程持续时间ra.setDuration(200);//罗盘图片使用旋转动画imageView.startAnimation(ra);currentDegree = -degree;}}//传感器精度的改变public void onAccuracyChanged(Sensor sensor, int accuracy) {}}

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