Easy to implement Android Compass features _android

This article examples for you to explain how to easily achieve the Android Compass function, share for everyone to reference. Specifically as follows:

(1) The layout file is as follows:

<?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>

Picture required:

(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 ();
    @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];//Store directional value rotateanimation a Nimation = new Rotateanimation (Predegree,-degree, Animation.relative_to_self, 0.5f, Animation.relativ
      E_to_self, 0.5f);
      Animation.setduration (200);
      Imageview.startanimation (animation);
    Predegree =-degree;
 public void onaccuracychanged (Sensor Sensor, int accuracy) {}}}

The effect is as follows:

I hope this article will help you learn about Android software programming.