Android实现指南针功能

（1）布局文件如下：

<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

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();@Overridepublic 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);}@Overrideprotected void onResume() {Sensor sensor = manager.getDefaultSensor(Sensor.TYPE_ORIENTATION);manager.registerListener(listener, sensor,SensorManager.SENSOR_DELAY_GAME);super.onResume();}@Overrideprotected 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 90RotateAnimation 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：

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