Question

我的申请仅涉及两项活动,即主要活动和优惠行动。当各州出现变化时(航空模式正在转轨或关闭,全球定位系统被转用或关闭等),我想更新这两项活动。

我需要更新一些变数,而且只有当评估活跃时,才需要评估,因此我相信,最好在编码上而不是在申请表上登记接收器。

由于我有意在每项活动中重复守则,我尝试将广播接收器放在自己的班级。然而,我发现我无法登记广播接收员。这一问题是否有办法?

感谢您, 页: 1

public class melsBigListener {


IntentFilter intentFilter = new IntentFilter("android.intent.action.SERVICE_STATE");
BroadcastReceiver receiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        //TO DO Update both my main activity and the preference activity
        //TO DO deal with different intents via switch statement... 
    } 

}; 

//registering as receiver(like below) can not work
//registerReceiver(receiver, intentFilter);}

Relevant post:RegisterBroadcastReceiver in Manifest.xmlring or by implementing source Code

Answer 1

registerReceiver(receiver, intentFilter); should be in some method.

。应扩大活动范围,或需要将活动环境纳入这一类别,并将其用于登记接收者。

最好不要做这种sil弄,而是在最坏的档案中写到接收器。

Answer 2

I suggest registering the receiver in the manifest and use it to alter variables stored in a preferences file (whether the app is running or not) and then query the preferences for state when needed.

But you could extend Application and register the receiver in code in the Application.onCreate() method.

Answer 3

BroadcastReceivers should work as an extended class that is registered to the phone using the manifest file. I m not too sure how it will work as an instantiated class inside an activity. judging by your code so far, the intent will never even be received by the Activity and your BigListener class because the intent filter was never declared in the manifest.

To solve your problem: 1. create a myBroadcastReceiver, extending from BroadcastReceiver, declaring the necessary intents in the manifest 2. create a myApplication, extending from Application 3. use your Activities onCreate, onDestroy, onStartCmd, onPause etc to manage the "only when the app is active" part, by toggling a variable in myApplication. 4. use myBroadcastReceiver to read off the variable in (3) whenever the intent is received, to decide if you "need to update some variables" and update accordingly. Since these variables are shared by your 2 Activities, the variables should be put inside the myApplication class

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