无法从 Android 10 上的 BroadcastReceiver 启动活动 [英] Can't start activity from BroadcastReceiver on android 10

问题描述

我昨晚将我的操作系统版本更新到了 android 10，从那以后广播接收器中的 startActivity 函数什么也没做.这就是我尝试根据 CommonsWare 的回答开始活动的方式:

I updated my OS version to android 10 last night, and since then the startActivity function inside the broadcast receiver is doing nothing. This is how I try to start the activity based on the answer of CommonsWare:

Intent i = new Intent(context, AlarmNotificationActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { // This is at least android 10...

                Log.d("Debug", "This is android 10");
                // Start the alert via full-screen intent.
                PendingIntent startAlarmPendingIntent = PendingIntent.getBroadcast(context, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
                String CHANNEL_ID = "my_channel_02";
                NotificationChannel channel = new NotificationChannel(CHANNEL_ID,
                        context.getString(R.string.notification_channel_name_second),
                        NotificationManager.IMPORTANCE_HIGH);
                NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
                notificationManager.createNotificationChannel(channel);
                NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
                        .setContentTitle("Um, hi!")
                        .setAutoCancel(true)
                        .setPriority(NotificationCompat.PRIORITY_HIGH)
                        .setFullScreenIntent(startAlarmPendingIntent, true);
                Log.d("Debug", "Try to load screen");
                notificationManager.notify(0, builder.build());

            }

日志显示我正在执行通知命令，但没有任何反应.我要求清单上的 USE_FULL_SCREEN_INTENT 权限，所以我应该能够使用全屏意图.由于这个问题，我的应用程序现在没用了.有谁知道如何解决它?

The log shows that I am getting to the notify command but nothing happens. I am asking for USE_FULL_SCREEN_INTENT permission on the manifest so I should be able to use full-screen intents. My app is useless now because of that issue. Does anyone know how to solve it?

推荐答案

Android 10 对后台活动启动的限制是在大约六个月前宣布的.您可以在文档中阅读更多相关信息.

Android 10's restriction on background activity starts was announced about six months ago. You can read more about it in the documentation.

改为使用具有关联全屏Intent的高优先级通知.请参阅文档.这个示例应用通过使用演示了这一点WorkManager 触发需要提醒用户的后台事件.在那里，我使用高优先级通知而不是直接启动活动:

Use a high-priority notification, with an associated full-screen Intent, instead. See the documentation. This sample app demonstrates this, by using WorkManager to trigger a background event needing to alert the user. There, I use a high-priority notification instead of starting the activity directly:

val pi = PendingIntent.getActivity(
  appContext,
  0,
  Intent(appContext, MainActivity::class.java),
  PendingIntent.FLAG_UPDATE_CURRENT
)

val builder = NotificationCompat.Builder(appContext, CHANNEL_WHATEVER)
  .setSmallIcon(R.drawable.ic_notification)
  .setContentTitle("Um, hi!")
  .setAutoCancel(true)
  .setPriority(NotificationCompat.PRIORITY_HIGH)
  .setFullScreenIntent(pi, true)

val mgr = appContext.getSystemService(NotificationManager::class.java)

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
  && mgr.getNotificationChannel(CHANNEL_WHATEVER) == null
) {
  mgr.createNotificationChannel(
    NotificationChannel(
      CHANNEL_WHATEVER,
      "Whatever",
      NotificationManager.IMPORTANCE_HIGH
    )
  )
}

mgr.notify(NOTIF_ID, builder.build())

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