无法在安卓 10上从BroadcastReceiver启动活动

Question

昨晚我把我的操作系统版本升级到了安卓10，从那以后，广播接收器内的startActivity功能就什么都没做了。以下是我如何根据Commonware的答案开始活动：

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 安卓 10...

                Log.d("Debug", "This is 安卓 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());

            }

日志显示我正在使用notify命令，但什么也没发生。我正在申请清单上的使用全屏意图许可，这样我就可以使用全屏意图了。 因为这个问题，我的应用程序现在没用了。有人知道怎么解决吗

Answer 1

安卓10对后台活动启动的限制大约在六个月前宣布。你可以在the documentation中阅读更多关于它的信息

使用高优先级通知，并使用相关的全屏Intent。见the documentationThis sample app通过使用WorkManager触发需要提醒用户的后台事件来演示这一点。在那里，我使用高优先级通知，而不是直接启动活动：

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())

Answer 2

安卓10对后台活动启动的限制大约在六个月前宣布。你可以在documentation中阅读更多关于它的信息

因此，您需要有一个高级通知，当用户单击该通知时，您的活动将被打开

public class UIExampleReceiver extends BroadcastReceiver {

public static final String TAG_NOTIFICATION = "NOTIFICATION_MESSAGE";
public static final String CHANNEL_ID = "channel_1111";
public static final int NOTIFICATION_ID = 111111;
private static final String TAG = "Receiver";

@Override
public void onReceive(Context context, Intent intent) {

    try {

            // If android 10 or higher
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.P)
            {

                 startActivityNotification(context,NOTIFICATION_ID,context.getResources().getString(R.string.open_app), context.getResources().getString(R.string.click_app));

            }
            else
            {
                // If lower than Android 10, we use the normal method ever.
                Intent activity = new Intent(context, ExampleActivity.class);
                activity.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(activity);
            }

    } catch (Exception e)
    {
        Log.d(TAG,e.getMessage()+"");
    }
}


 // notification method to support opening activities on Android 10
public static void startActivityNotification(Context context, int notificationID, 
String title, String message) {

    NotificationManager mNotificationManager =
            (NotificationManager) 
   context.getSystemService(Context.NOTIFICATION_SERVICE);
    //Create GPSNotification builder
    NotificationCompat.Builder mBuilder;

    //Initialise ContentIntent
    Intent ContentIntent = new Intent(context, ExampleActivity.class);
    ContentIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | 
    Intent.FLAG_ACTIVITY_CLEAR_TASK);
    PendingIntent ContentPendingIntent = PendingIntent.getActivity(context,
            0,
            ContentIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);

    mBuilder = new NotificationCompat.Builder(context)
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle(title)
            .setContentText(message)
            .setColor(context.getResources().getColor(R.color.colorPrimaryDark))
            .setAutoCancel(true)
            .setContentIntent(ContentPendingIntent)
            .setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE)
            .setCategory(NotificationCompat.CATEGORY_MESSAGE)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT);

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID,
                "Activity Opening Notification",
                NotificationManager.IMPORTANCE_HIGH);
        mChannel.enableLights(true);
        mChannel.enableVibration(true);
        mChannel.setDescription("Activity opening notification");

        mBuilder.setChannelId(CHANNEL_ID);

   Objects.requireNonNull(mNotificationManager).createNotificationChannel(mChannel);
    }

 Objects.requireNonNull(mNotificationManager).notify(TAG_NOTIFICATION,notificationID, 
 mBuilder.build());
    }

}