Android利用Sensor实现指南针功能

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>

package cn.roco.sensor;    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) {      }     }  }

<?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>

step5:部署应用到真机环境中  就可以查看运行的效果啦

 来自：http://blog.csdn.net/qq446282412/article/details/8801204