Android:检查活动是否被系统从服务中销毁 [英] Android: Check if activity is destroyed by a system from service

问题描述

我有一项服务可以监听服务器中的某些事件. 服务具有START_STICKY标志，使该标志在被操作系统杀死后重新启动. 服务收到事件时，我有两种情况. 首先，如果没有杀死活动，我需要将结果发送到本地广播接收器并更新UI. 其次，如果它被操作系统杀死，我想重新创建它并捆绑发送数据.

I have a service listening to some events from server. A service has START_STICKY flag that makes him restart when it's killed by OS. When service receive an event i have two scenarios. First, if activity isn't killed i need to send result to local broadcast receiver and update UI. Second, if it's killed by OS i want to recreate it and send data in bundle.

但是我不知道如何识别android杀死了我的活动. 在这种情况下，不会发生onDestroy活动事件.

But i don't know how to recognize that android killed my activity. onDestroy activity event doesn't come in this situation.

    @Override
    public void onComplete(CurrentOrdersResponse response) {
        if (response == null) {
            return;
        }
        boolean isActivityDestroyed = mPreferences.getBoolean(MainActivity.IS_MAIN_ACTIVITY_DESTROYED_PREF_KEY, false);
        if (!isActivityDestroyed)
            sendResult(response.getResJSONStr(), CURRENT_ORDERS_ACTION);
        else {
            Intent intent = new Intent(this, MainActivity.class);
            intent.setAction(Intent.ACTION_VIEW);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.putExtras(extras);
            startActivity(intent);
        }
        int resCode = response.getResCode();
        Log.i(LOG_TAG, "Service resCode" + " " + resCode);
    }

推荐答案

听起来您正在使用LocalBroadcastManager.那挺好的.其 sendBroadcast()方法返回一个布尔值，指示是否找到了已注册的接收者.您可以使用该结果来确定您的接收活动(MainActivity)是否存在并且已注册接收广播.

It sounds like you are using LocalBroadcastManager. That's good. Its sendBroadcast() method returns a boolean indicating if a registered receiver was found. You can use that result to determine if your receiving activity (MainActivity) exists and has registered to receive the broadcast.

当您的服务有要发送给MainActivity的事件时，请首先尝试使用sendBroadcast()发送事件.如果返回true，则完成.如果返回false，则该活动未注册，必须使用startActivity()创建，并附加传递事件，如您发布的代码所示.

When your service has an event to send to MainActivity, first try to send the event using sendBroadcast(). If it returns true, your done. If it returns false, the activity is not registered and must be created using startActivity(), with the event passed as an extra, as shown in your posted code.

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