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在我的应用程序中，我正在检查是否有网络连接；如果没有，则开始一项活动，当连接恢复时，完成该活动。我正在使用广播接收器来确定网络连接，但应用程序在需要完成该活动时崩溃，给我一个RestrictedContext error.

这是 LogCat 输出：

01-05 14:22:21.543: E/AndroidRuntime(7064): FATAL EXCEPTION: main
01-05 14:22:21.543: E/AndroidRuntime(7064): java.lang.RuntimeException: Unable to start receiver net.evolution.betting.application.ConnectionChangeReceiver: java.lang.ClassCastException: android.app.ReceiverRestrictedContext
01-05 14:22:21.543: E/AndroidRuntime(7064):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2821)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at android.app.ActivityThread.access$3200(ActivityThread.java:125)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2083)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at android.os.Looper.loop(Looper.java:123)

01-05 14:22:21.543: E/AndroidRuntime(7064):     at android.app.ActivityThread.main(ActivityThread.java:4627)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at java.lang.reflect.Method.invokeNative(Native Method)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at java.lang.reflect.Method.invoke(Method.java:521)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at dalvik.system.NativeStart.main(Native Method)
01-05 14:22:21.543: E/AndroidRuntime(7064): Caused by: java.lang.ClassCastException: android.app.ReceiverRestrictedContext
01-05 14:22:21.543: E/AndroidRuntime(7064):     at net.evolution.betting.application.ConnectionChangeReceiver.onReceive(ConnectionChangeReceiver.java:37)
01-05 14:22:21.543: E/AndroidRuntime(7064):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2810)
01-05 14:22:21.543: E/AndroidRuntime(7064):     ... 10 more

这是课程来源：

public class ConnectionChangeReceiver extends BroadcastReceiver {
    @Override
    public void onReceive( Context context, Intent intent ) {
        ActivityManager activityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE); 
        List<RunningTaskInfo> activitys = activityManager.getRunningTasks(Integer.MAX_VALUE); 
        boolean isActivityFound = false; 
        for (int i = 0; i < activitys.size(); i++) { 
            if (activitys.get(i).topActivity.toString().equalsIgnoreCase("ComponentInfo{net.evolution.betting.application/net.evolution.betting.application.NotationActivity}")) {
                isActivityFound = true;
            }
        } 

        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE );
        NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
        NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo(     ConnectivityManager.TYPE_MOBILE );
        if ( activeNetInfo != null && isActivityFound == true) {
            ((NotationActivity)context).finish();
        }else if( activeNetInfo == null){
            Intent i = new Intent("net.evolution.betting.application.NOTATIONACTIVITY");
            i.putExtra("DialogTitle", "Warining!");
            i.putExtra("DialogBody", "It seems like your app is not connected to Internet witch is required.Please check your network connection.");
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(i);
        }
    }
}
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2 回答 2

1

你不能这样做“（（NotationActivity）context）”。“上下文”它是您的接收者的上下文，而不是您的 NotationActivity 的上下文。所以你不能那样施放它并获得活动。

有几种方法可以满足您的需要。谷歌“从广播接收器完成活动”。有很多有用的信息可以帮助您找到最适合您的案例的方法。

于 2013-01-05T15:49:20.587 回答
1

问题是在这条线上

 ((NotationActivity)context).finish();

将您的 Receiver 作为 Activity 的内部类，以便它可以访问 finish() 方法，或者找到另一种从接收器到 Activity 的通信方式。

于 2013-01-05T15:50:31.103 回答