如何從MainActivity外部的BroadcastReceiver類重新加載/刷新Main Activity-Android

Question

我有一個MainActivity類，該類調用服務器以在onCreate（）方法中獲取消息。

然后我在MainActivity類之外有一個BroadcastReceiver類。

這是我的BroadcastReceiver類：

  public class GcmBroadcastReceiver extends WakefulBroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    // Explicitly specify that GcmIntentService will handle the intent.
    ComponentName comp = new ComponentName(context.getPackageName(),
            GcmIntentService.class.getName());
    // Start the service, keeping the device awake while it is launching.
    startWakefulService(context, (intent.setComponent(comp)));
    setResultCode(Activity.RESULT_OK);

    Bundle extras = intent.getExtras();

    if (extras != null) {

        // This is where I want to refresh/reload MainActivity 

    }

}

}

如果Extras！= null，我想刷新MainActivity類，以便再次執行onCreate（）調用。 我怎樣才能做到這一點？

這是我的清單文件片段：

  <receiver
    android:name="za.co.vine.samplepush.GcmBroadcastReceiver"
    android:permission="com.google.android.c2dm.permission.SEND" >
    <intent-filter>

        <!-- Receives the actual messages. -->
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />

        <category android:name="za.co.vine.samplepush" />
    </intent-filter>
</receiver>

Answer 1

使用意圖啟動MainActivity然后將android：launchMode屬性更改為“ singleTop”，這樣您就不會有2個MainActivity實例