Android uses directional sensors to implement the compass specific steps _android

Step1:Create a new project compass and import a compass picture into the res/drawable-hdpi directory

Step2:UI interface for design applications, Main.xml

Copy Code code as follows:

<span style= "font-size:18px" ><strong><?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></STRONG></SPAN>

Step3:Mainactivity.java

Copy Code code as follows:

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;
/** Sensor Manager */
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);//Screen highlighting
Get system service (Sensor_service) returns a Sensormanager object
Manager = (Sensormanager) getsystemservice (Context.sensor_service);
}
@Override
protected void Onresume () {
/**
* Get direction sensor
* Get the corresponding sensor type object through the Sensormanager object
*/
Sensor Sensor = Manager.getdefaultsensor (sensor.type_orientation);
Apply to register listeners at the front desk
Manager.registerlistener (listener, sensor,
Sensormanager.sensor_delay_game);
Super.onresume ();
}
@Override
protected void OnPause () {
The application does not destroy the listener at the front
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 direction acceleration
VALUES[1]: Y-axis direction acceleration
VALUES[2]: Z-axis direction acceleration
*/
Float degree = event.values[0];//Store directional value
/** Animation Effect * *
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

Copy Code code as follows:

<span style= "font-size:18px" ><strong><?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>
& Lt;action android:name= "Android.intent.action.MAIN"/>
<category android:name= " Android.intent.category.LAUNCHER "/>
</intent-filter>
</activity>
</application>
</manifest></STRONG></SPAN>