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从 Android 中service 详解 和Android service 启动篇之 startForegroundService 中我们知道在android 8.0 禁止启动后台服务。提出通过startForegroundService() 启动前台服务。但是必须要配合在service 中调用Service.startForeground(),不然就会出现ANR 或者crash。
ANR log 如下:
- 11-06 02:01:59.616 3877 3893 E ActivityManager: ANR in com.shift.phonemanager.permission.accesslog
- 11-06 02:01:59.616 3877 3893 E ActivityManager: PID: 1369
- 11-06 02:01:59.616 3877 3893 E ActivityManager: Reason: Context.startForegroundService() did not then call Service.startForeground()
- 11-06 02:01:59.616 3877 3893 E ActivityManager: Load: 0.0 / 0.0 / 0.0
- 11-06 02:01:59.616 3877 3893 E ActivityManager: CPU usage from 7945ms to 0ms ago (2007-11-06 02:01:51.418 to 2007-11-06 02:01:59.363):
- 11-06 02:01:59.616 3877 3893 E ActivityManager: 60% 3877/system_server: 35% user + 25% kernel / faults: 3744 minor 6 major
- 11-06 02:01:59.616 3877 3893 E ActivityManager: 25% 1042/com.android.launcher3: 20% user + 4.9% kernel / faults: 11190 minor 9 major
- 11-06 02:01:59.616 3877 3893 E ActivityManager: 18% 1149/android.process.media: 13% user + 5.3% kernel / faults: 6130 minor
- 11-06 02:01:59.616 3877 3893 E ActivityManager: 15% 1420/adbd: 3.6% user + 11% kernel / faults: 5074 minor
- 11-06 02:01:59.616 3877 3893 E ActivityManager: 9.7% 255/logd: 2.7% user + 6.9% kernel / faults: 5 minor
- 11-06 02:01:59.616 3877 3893 E ActivityManager: 9.2% 3814/surfaceflinger: 4.4% user + 4.8% kernel / faults: 658 minor
crash log 如下:
- --------- beginning of crash
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: FATAL EXCEPTION: main
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: Process: com.shift.phonemanager.permission.accesslog, PID: 3106
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: android.app.RemoteServiceException: Context.startForegroundService() did not then call Service.startForeground()
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1771)
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106)
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: at android.os.Looper.loop(Looper.java:164)
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6518)
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
- 11-06 02:06:05.307 3106 3106 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
- 11-06 02:06:05.320 3118 3118 D ExtensionsFactory: No custom extensions.
实例:
- private void showNotification() {
- // In this sample, we'll use the same text for the ticker and the expanded notification
- CharSequence text = getText(R.string.local_service_started);
-
- // The PendingIntent to launch our activity if the user selects this notification
- PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
- new Intent(this, LocalServiceActivities.Controller.class), 0);
-
- // Set the info for the views that show in the notification panel.
- Notification notification = new Notification.Builder(this)
- .setSmallIcon(R.drawable.stat_sample) // the status icon
- .setTicker(text) // the status text
- .setWhen(System.currentTimeMillis()) // the time stamp
- .setContentTitle(getText(R.string.local_service_label)) // the label of the entry
- .setContentText(text) // the contents of the entry
- .setContentIntent(contentIntent) // The intent to send when the entry is clicked
- .build();
-
- // Send the notification.
- mNM.notify(NOTIFICATION, notification);
- }

实例:
- private void setForegroundNotification() {
- NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
-
- String channelId = "access_log_channel";
- NotificationChannel channel = new NotificationChannel(channelId, "channel_1",
- NotificationManager.IMPORTANCE_DEFAULT);
-
- nm.createNotificationChannel(channel);
-
- Notification notification = new Notification.Builder(this).setChannelId(channelId)
- .setSmallIcon(R.drawable.ic_launcher)
- .setContentTitle(getString(R.string.permission_access_log_title))
- .build();
- startForeground(1, notification);
- }
参考:
https://developer.android.com/about/versions/oreo/background
https://developer.android.com/reference/android/app/Service
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