屏幕关闭时从 BroadcastReceiver 打开 Activity

Question

当应用程序正在运行并且设备被锁定时，我可以开始活动。但是，当应用程序处于后台并且设备被锁定时，即使我在 BroadcastReceiver 类中获得了控制权，也无法启动活动。这是我的意图调用。

context.startActivity(new Intent(context, ReceiveCallActivity.class)
                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                    .setAction(Intent.ACTION_ANSWER)
                    .putExtra("title", intent.getStringExtra("title"))
                    .putExtra("action", intent.getStringExtra("action")));

活动清单

<activity
            android:name=".ReceiveCallActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:excludeFromRecents="true"
            android:launchMode="singleTop"
            android:showOnLockScreen="true"
            android:showWhenLocked="true"
            android:turnScreenOn="true"
            android:windowSoftInputMode="adjustPan|stateHidden" />

ReceiveCallActivity.class

 @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
            setShowWhenLocked(true);
            setTurnScreenOn(true);
        } else {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                    | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                    | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);
        }
        setContentView(R.layout.receive_call_activity);
        ...
        ...
}

setShowWhenLocked(true) && setTurnScreenOn(true) 有助于打开应用程序，即使设备被锁定，但应用程序必须在前台。

PS：我在所有情况下都在 BroadcastReceiver 中获得控制权。

TIA

Answer 1

我正在检查从设置中授予 Skype 的不同权限，并注意到“在锁定屏幕上显示”已启用，而我的应用程序已禁用相同权限。启用后，BroadcastReceiver 能够在所有场景中打开 Activity。我读到这是 Xiamoi 设备的问题（我使用的是 Note 5 Pro）。

编辑

对于 Android 10 需要在 manifest 中添加 USE_FULL_SCREEN_INTENT 权限。 那么当屏幕被锁定时，在NotificationCompat.Builder上设置为FullScreenIntent的PendingIntent会被调用。

我的通知代码：

private void showCallNotification(Map<String, String> dataMap) {

//CREATING pendingIntent
...
...
...

        PendingIntent fullScreenPendingIntent = PendingIntent.getActivity(this, 2, fullScreenIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        PendingIntent cancelPendingIntent = PendingIntent.getBroadcast(this, 1, cancelIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        RemoteViews notificationLayout = new RemoteViews(getPackageName(), R.layout.notification_small);
        notificationLayout.setTextViewText(R.id.tvTitle, dataMap.get("sender"));
        notificationLayout.setTextViewText(R.id.tvContent, getString(R.string.incoming_call));
        notificationLayout.setOnClickPendingIntent(R.id.tvAccept, pendingIntent);
        notificationLayout.setOnClickPendingIntent(R.id.tvDecline, cancelPendingIntent);

        RemoteViews notificationLayoutExpanded = new RemoteViews(getPackageName(), R.layout.notification_large);
        notificationLayoutExpanded.setTextViewText(R.id.tvTitle, dataMap.get("sender"));
        notificationLayoutExpanded.setTextViewText(R.id.tvContent, getString(R.string.incoming_call));
        notificationLayoutExpanded.setOnClickPendingIntent(R.id.btAccept, pendingIntent);
        notificationLayoutExpanded.setOnClickPendingIntent(R.id.btDecline, cancelPendingIntent);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, AppConstants.CALL_CHANNEL_ID)
                .setSmallIcon(R.drawable.ic_notification)
                .setContentTitle(dataMap.get("sender"))
                .setContentText(getString(R.string.incoming_call))
                .setAutoCancel(true)
                .setTimeoutAfter(CALL_DISMISS_TIME)
                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                .setCustomBigContentView(notificationLayout)
                .setCustomContentView(notificationLayoutExpanded)
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setContentIntent(fullScreenPendingIntent)
                .setFullScreenIntent(fullScreenPendingIntent, true);

        if (Build.VERSION.SDK_INT < 26) {
            builder.setPriority(NotificationCompat.PRIORITY_MAX);
        }

        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            createCallNotificationChannel();
        }

        notificationManager.notify(notificationId, builder.build());
}

我这样称呼它

onMessageReceived()

if (Build.VERSION.SDK_INT > 28) {
   if (isAppOnForeground(getApplicationContext())) {
       sendBroadcast(remoteMessage);
   } else {
       showCallNotification(dataMap);
   }
} else {
   sendBroadcast(remoteMessage);
}