在 Android 中从 BroadcastReceiver 调用 Activity 方法 [英] Calling a Activity method from BroadcastReceiver in Android

问题描述

这里我正在创建一个仅依赖于 Internet 的在线应用程序.

Here I am creating an online application that depends only on Internet.

所以每当出现网络错误时，它必须通知用户.为此，我创建了一个 BroadcastReciver，它可以在网络连接丢失(互联网)时接收呼叫.

So whenever there is a network error it must notify user. For that, I have created a BroadcastReciver that receives call when network connection gets lost(Internet).

所有这些都完美无缺.现在我需要的是我必须从这个广播接收器调用一个 Activity 方法，我在那里创建了一个警报对话.

All this works perfectly. Now what I need is that I have to call a method of Activity from this Broadcast Receiver, where I have created an Alert Dialogue.

我在 stack-overflow.com 上阅读了许多答案，我可以声明该方法为静态并仅使用活动名称进行调用，

I have read many answers on stack-overflow.com that I can declare that method static and call by using only Activity name,

例如 MyActivityName.myMethod()

但是我不能声明我的方法是静态的，因为我在那里使用 Alert Dialogue 并且它在线显示我的错误，

But I can't declare my method static, because I am using Alert Dialogue there and it shows me error on line,

AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);

不能在静态上下文中使用它.

那么，我如何从广播接收器调用 Activity 的方法(不能是静态的并且不启动该活动)?

So, how can I call a method of Activity(must not static and without starting that activity) from a Broadcast Receiver ?

我可以从当前正在运行的广播接收器中获取活动(或片段)名称吗?

And can I get Activity(or fragment) name from Broadcast Receiver which is currently running?

推荐答案

试试这个代码:

您的广播接收器类用于互联网丢失类:

your broadcastreceiver class for internet lost class :

public class InternetLostReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
    context.sendBroadcast(new Intent("INTERNET_LOST"));
}
}

在您的活动中添加此用于调用广播:

in your activity add this for calling broadcast:

public class TestActivity  extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    registerReceiver(broadcastReceiver, new IntentFilter("INTERNET_LOST"));
}

BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        // internet lost alert dialog method call from here...
    }
};

@Override
protected void onDestroy() {
    super.onDestroy();
    unregisterReceiver(broadcastReceiver);
}
}

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