当我的应用程序在后台时调用 onLocationChanged 太晚了

Question

我正在获取服务中的位置更新。当我的应用程序处于前台时，OnLocationChange 在几秒钟内被调用。但是当它在后台时，它会在几分钟后被调用.. 问题是什么？什么是解决方案？我在后台运行时不会停止我的服务。

Answer 1

我发现了问题。 Android 从 8.0 开始对位置更新添加了限制 here:

"In an effort to reduce power consumption, Android 8.0 (API level 26) limits how frequently background apps can retrieve the user's current location. Apps can receive location updates only a few times each hour."

解决方法：需要启动Foreground Service，需要显示通知，如：

Intent notificationIntent = new Intent(this, ExampleActivity.class);
PendingIntent pendingIntent =
        PendingIntent.getActivity(this, 0, notificationIntent, 0);

Notification notification =
          new Notification.Builder(this, CHANNEL_DEFAULT_IMPORTANCE)
    .setContentTitle(getText(R.string.notification_title))
    .setContentText(getText(R.string.notification_message))
    .setSmallIcon(R.drawable.icon)
    .setContentIntent(pendingIntent)
    .setTicker(getText(R.string.ticker_text))
    .build();

startForeground(ONGOING_NOTIFICATION_ID, notification);

当我的应用程序在后台时调用 onLocationChanged 太晚了

onLocationChanged is called too late when my App is in background

service

android

location