本文介绍了在后台运行在Android GPS监听器的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想知道如何接收GPS时,Android应用程序是在后台。是否有一个完整的教程来解释呢?
I would like to know how to receive GPS when the Android app is in the background. Is there a complete tutorial to explain it?
推荐答案
您需要使用AlarmManager激活挂起的意图(通过广播接收器)来启动一个后台服务。
You need to use a AlarmManager to activate a pending intent (via a broadcast receiver) to launch a background service.
有些样品code为您
在你MainActivity
In your MainActivity
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent notifyintent = new Intent(this, OnAlarmReceiver.class);
notifyintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
notifyintent.setAction("android.intent.action.NOTIFY");
PendingIntent notifysender = PendingIntent.getBroadcast(this, 0, notifyintent,
PendingIntent.FLAG_UPDATE_CURRENT);
am.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 20 * 1000,
notifysender);
AlarmReceiver类
AlarmReceiver class
public class OnAlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// PullPendingRequests.acquireStaticLock(context)
try {
lock = getLock(context);
lock.acquire();
context.startService(new Intent(context, UpdateCustomerRequests.class));
} finally {
if (lock.isHeld()) {
lock.release();
}
}
}
在BroadcastReceiver的
The BroadcastReceiver
private static final String NAME = "com.commonsware.cwac.wakeful.WakefulIntentService";
private static volatile PowerManager.WakeLock lockStatic = null;
private static PowerManager.WakeLock lock;
// Needed since network will to work when device is sleeping.
synchronized private static PowerManager.WakeLock getLock(Context context) {
if (lockStatic == null) {
PowerManager mgr = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
lockStatic = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, NAME);
lockStatic.setReferenceCounted(true);
}
return (lockStatic);
}
}
后台服务。在这里,你,直到另行通知2要点
The background Service. Here you till notice 2 important points
- WakeLock,以确保您的设备唤醒并使用网络的背景
- 在一个黑客的LocationManager工作。我不得不调试这2周左右,相信我,你需要这个。 requestLocationUpdates和getLastKnownLocation当你想将只是不会给你的位置。因此,AlarmManager(它的运行速度比Java的TimerTask的啄好得多)。
所有这些工作在Play商店生产应用程序。
All this works in a production app on the play store.
public class UpdateCustomerRequests extends IntentService implements LocationListener {
private static Context mainContext;
public UpdateCustomerRequests() {
super("UpdateCustomerRequests");
mHandler = new Handler();
me = this;
}
public static UpdateCustomerRequests getService() {
if (me == null)
me = new UpdateCustomerRequests();
return me;
}
@Override
final protected void onHandleIntent(Intent intent) {
mainContext = getApplicationContext();
Location myLocation;
if (HomeScreen.getLocationManager() != null) {
// this is needed to trigger a background location change. Since LocationManager does not work on Samsung phones. Its a hack needed.
HomeScreen.getLocationManager().requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 0, 0, new LocationListener() {
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onLocationChanged(final Location location) {
}
});
myLocation = HomeScreen.getLocationManager().getLastKnownLocation(
LocationManager.NETWORK_PROVIDER);
if (myLocation != null)
onLocationChanged(myLocation);
else {
God.notifications.setSpeedNotification();
}
} else
Log.e("Taxeeta:PullPendingRequets", "Not activated");
}
@Override
public void onLocationChanged(final Location location) {
// Do your background stuff
}
}
最后不要忘记你的清单啄。
Lastly dont forget your manifest thingy.
<service
android:name="com.taxeeta.UpdateCustomerRequests"
android:enabled="true"
android:label="@string/app_name"
android:screenOrientation="portrait"
android:theme="@android:style/Theme.Light.NoTitleBar" />
<receiver
android:name="com.taxeeta.support.OnAlarmReceiver"
android:exported="true" >
<intent-filter>
<action android:name="android.intent.action.NOTIFY" />
</intent-filter>
</receiver>
<receiver
android:name="com.taxeeta.HomeScreen$ResponseReceiver"
android:exported="true" >
<intent-filter>
<action android:name="com.taxeeta.intent.action.GET_SCREEN_UPDATES" />
</intent-filter>
</receiver>
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