我在使用Android的后台定位服务时遇到了一些问题。我开始使用此代码并根据我的需要对其进行了修改:https://gist.github.com/blackcj/20efe2ac885c7297a676
以下是LocationLoggerServiceManager的修改部分:
我更改了部分,因此我可以使用自己的广播手动启动此服务。
public class LocationLoggerServiceManager extends BroadcastReceiver {
private SharedPreferences mPrefs;
public static final String TAG = "LocationLoggerServiceManager";
@Override
public void onReceive(Context context, Intent intent) {
// Make sure we are getting the right intent
if( "android.intent.action.BOOT_COMPLETED".equals(intent.getAction()) || "ftm.vem_game.services.LocationLoggerServiceManager".equals((intent.getAction()))) {
boolean mUpdatesRequested = false;
// Open the shared preferences
mPrefs = context.getSharedPreferences("ftm.vem_game.shared_preferences",
Context.MODE_PRIVATE);
/*
* Get any previous setting for location updates
* Gets "false" if an error occurs
*/
if (mPrefs.contains("KEY_UPDATES_ON")) {
mUpdatesRequested = mPrefs.getBoolean("KEY_UPDATES_ON", false);
}
if(mUpdatesRequested){
//ComponentName comp = new ComponentName(context.getPackageName(), BackgroundLocationService.class.getName());
//ComponentName service = context.startService(new Intent().setComponent(comp));
Intent i = new Intent(context, BackgroundLocationService.class);
ComponentName service = context.startService(i);
if (null == service){
// something really wrong here
Log.e(TAG, "Could not start service BackgroundLocationService");
}
}
} else {
Log.e(TAG, "Received unexpected intent " + intent.toString());
}
}
}
以下是我在MainActivity类中发送Broadcast的部分:
public static final String BROADCAST = "ftm.vem_game.services.LocationLoggerServiceManager";
SharedPreferences sharedPref = getSharedPreferences("ftm.vem_game.shared_preferences", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean("KEY_UPDATES_ON", true);
editor.commit();
Intent intent = new Intent(BROADCAST);
Bundle extras = new Bundle();
extras.putString("send_data", "test");
intent.putExtras(extras);
sendBroadcast(intent);
在服务类上,我什么都没改变。问题是服务永远不会启动,在Log中它说“无法启动服务BackgroundLocationService”。而context.startService()每次都返回null。
我不知道自己做错了什么,或者在开始服务之前我想错过一些事情。
答案 0 :(得分:1)
也许您忘了在AndroidManifest.xml中定义服务,如果是这样,只需将以下代码添加到您的Manifest中:
<service
android:name="com.examples.yourApp.BackgroundLocationService"
android:icon="@drawable/ic_launcher"
android:label="@string/service_name">
</service>
如果您想在后台永久运行它,请查看以下链接: http://uncorkedstudios.com/blog/background-location-updates-on-android