Android 利用方向传感器实现 指南针

               

step1:新建一个项目Compass,并将一张指南针图片导入到res/drawable-hdpi目录中

step2:设计应用的UI界面,main.xml

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

step3：MainActivity.java

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; /** 传感器管理器 */ 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);//屏幕高亮  //获取系统服务（SENSOR_SERVICE)返回一个SensorManager 对象  manager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); } @Override protected void onResume() {  /**   *  获取方向传感器   *  通过SensorManager对象获取相应的Sensor类型的对象   */  Sensor sensor = manager.getDefaultSensor(Sensor.TYPE_ORIENTATION);  //应用在前台时候注册监听器  manager.registerListener(listener, sensor,    SensorManager.SENSOR_DELAY_GAME);  super.onResume(); } @Override protected void onPause() {  //应用不在前台时候销毁掉监听器  manager.unregisterListener(listener);  super.onPause(); } private final class SensorListener implements SensorEventListener {  private float predegree = 0;  @Override  public void onSensorChanged(SensorEvent event) {   /**    *  values[0]: x-axis 方向加速度   　　 values[1]: y-axis 方向加速度   　　 values[2]: z-axis 方向加速度    */   float degree = event.values[0];// 存放了方向值   /**动画效果*/   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;      /**   float x=event.values[SensorManager.DATA_X];   float y=event.values[SensorManager.DATA_Y];   float z=event.values[SensorManager.DATA_Z];   Log.i("XYZ", "x="+(int)x+",y="+(int)y+",z="+(int)z);   */  }  @Override  public void onAccuracyChanged(Sensor sensor, int accuracy) {  } }}

step4:AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="cn.roco.sensor"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="8" />    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name="MainActivity"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

           

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