奥利奥（Oreo）：如何从后台捕获位置更新？ [英] Oreo: how to catch location update from the background?
问题描述
我将我的应用程序迁移到了oreo（因为Google Play现在要求），并且在启动手机时出现错误：
I migrate my app to oreo (as it's requiered by google play now), and i have now an error when i start my phone :
不允许启动服务意图
Not allowed to start service Intent
我的应用在后台监听任何位置更新，并定期将这些获取的位置发送到服务器。为此我要做：
My app is listening in background any location update and send periodically those grabbed locations to a server. for this i do :
在 AndroidManifest.xml
<receiver android:name="com.myapp.StartServiceBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
@Override
public void onReceive(Context context, Intent intent) {
try {
/* start the location service */
Intent startServiceIntent = new Intent(context, LocationService.class);
context.startService(startServiceIntent);
} catch (Throwable e){ Log.e(TAG, "Exception", e); }
}
和LocationService基本运行：
and the LocationService basiqually do :
public void onCreate() {
mLocationServices.setListener(this);
mLocationServices.startLocationUpdates(true, // startWithLastKnownLocation,
150000, // interval => 2.5 min // Set the desired interval for active location updates, in milliseconds.
// The location client will actively try to obtain location updates for your
// application at this interval, so it has a direct influence on the amount
// of power used by your application. Choose your interval wisely.
30000, // fastestInterval => 30 s // Explicitly set the fastest interval for location updates, in milliseconds.
// This controls the fastest rate at which your application will receive location updates, which might be faster than setInterval(long)
// in some situations (for example, if other applications are triggering location updates).
// This allows your application to passively acquire locations at a rate faster than it actively acquires locations, saving power.
900000, // maxWaitTime => 15 min // Sets the maximum wait time in milliseconds for location updates.
// If you pass a value at least 2x larger than the interval specified with setInterval(long), then location
// delivery may be delayed and multiple locations can be delivered at once. Locations are determined at
// the setInterval(long) rate, but can be delivered in batch after the interval you set in this method.
// This can consume less battery and give more accurate locations, depending on the device's hardware
// capabilities. You should set this value to be as large as possible for your needs if you don't
// need immediate location delivery.
LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY, // priority => Block level accuracy is considered to be about 100 meter accuracy.
// Using a coarse accuracy such as this often consumes less power.
25); // smallestDisplacement => 25 meters // Set the minimum displacement between location updates in meters
}
@Override
public void onLocationChanged(Location location) {
....
}
在前色情电影中一切工作都很好，但是现在在oreo +上失败。我该怎么做才能使我的服务运行？
Everything was working well on pre-oreo but now it's failed on oreo+. What i can do to make my service running ?
推荐答案
从Android Oreo开始，您不能简单地在应用程序处于后台时启动后台服务。
Starting in Android Oreo you cannot simply start a background service while the app is in the background.
您可以像这样启动前台服务（Kotlin，但在Java中与此类似）：
You can start your service as foreground service like that (Kotlin, but similar in Java):
val serviceIntent = Intent(context, LocationService::class.java)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(serviceIntent)
} else {
context.startService(serviceIntent)
}
在您的服务中，请确保致电< a href = https://developer.android.com/reference/android/app/Service.html#startForeground(int,%20android.app.Notification） rel = nofollow noreferrer> startForeground 尽可能。这还将发出通知，以便用户知道您的应用程序在后台处于活动状态。
In your service make sure you call startForeground as soon as possible. This will also issue a notification so that the user knows your app is active in the background.
以 Anis BEN NSIR 在这些评论，您可能还会受到新的背景位置限制。
As Anis BEN NSIR has pointed out in the comments, you will probably also be affected by the new background location limits.
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