无法从 Android 10 上的 BroadcastReceiver 启动活动

Question

我昨晚将操作系统版本更新为 android 10，从那时起，广播接收器中的 startActivity 函数就什么也不做。这就是我尝试根据 CommonsWare 的回答开始活动的方式：

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());

            }

日志显示我正在使用通知命令，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？

Answer 1

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。

Intent改为使用具有关联全屏的高优先级通知。请参阅文档。此示例应用程序演示了这一点，通过WorkManager用于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：

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

你可以在android 10中使用SYSTEM_ALERT_WINDOW强制启动活动窗口，参考这个设置叠加设置：

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>  
</activity>  
    <receiver
        android:name=".OnBootReceiver"
        android:enabled="true"
        android:exported="true"
        android:permission="android.permission.RECEIVE_BOOT_COMPLETED" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

在启动的应用程序检查权限中：

private void RequestPermission() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (!Settings.canDrawOverlays(this)) {
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:" + this.getPackageName()));
            startActivityForResult(intent, ACTION_MANAGE_OVERLAY_PERMISSION_REQUEST_CODE);
        } else {
            //Permission Granted-System will work
        }
    }
}

您可以将用户意图用作 android 旧版本

public class OnBootReceiver extends BroadcastReceiver {
    private static final String TAG = OnBootReceiver.class.getSimpleName();

    @Override
    public void onReceive(Context context, Intent intent) {
        try {
            Intent activity = new Intent(context, MainActivity.class);
            activity.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(activity);
        } catch (Exception e){
            Log.d(TAG,e.getMessage()+"");
        }
    }
}