Question

我正在提取推送通知的文本并在警报中显示 - 但是，我在激活接收器时遇到致命异常（请参阅下面的logcat）

11-26 08:35:51.919    4607-4607/au.gov.nsw.shellharbour.saferroadsshellharbour E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start receiver au.gov.nsw.shellharbour.saferroadsshellharbour.HomeScreen$Receiver: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application 
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:2291)
    at android.app.ActivityThread.access$1600(ActivityThread.java:143)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4963)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
    at android.view.ViewRootImpl.setView(ViewRootImpl.java:716)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:356)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:234)
    at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:153)
    at android.app.Dialog.show(Dialog.java:277)
    at android.app.AlertDialog$Builder.show(AlertDialog.java:932)
    at au.gov.nsw.shellharbour.saferroadsshellharbour.HomeScreen$Receiver.onPushOpen(HomeScreen.java:198)
    at com.parse.ParsePushBroadcastReceiver.onReceive(ParsePushBroadcastReceiver.java:108)
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:2284)
    at android.app.ActivityThread.access$1600(ActivityThread.java:143)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4963)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
    at dalvik.system.NativeStart.main(Native Method)
11-26 08:36:06.779    4607-4607/au.gov.nsw.shellharbour.saferroadsshellharbour I/Process﹕ Sending signal. PID: 4607 SIG: 9

以下是我的Receiver课程：

private void displayAlert（）{

    AlertDialog Alert= new AlertDialog.Builder(this)
            .setTitle("News")
            .setMessage(notificationText)
            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){
                public void onClick(DialogInterface dialog, int which){
                }
            })
            .show();

}


public static class Receiver extends ParsePushBroadcastReceiver {
    private String notificationText;
    public Receiver(){

    }
    private static final String TAG = "MyNotificationsReceiver";

    @Override
    public void onPushOpen(Context context, Intent intent) {
        Log.e("Push", "Clicked");
        Intent i = new Intent(context, HomeScreen.class);
        i.putExtras(intent.getExtras());
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
            try {
                JSONObject json = new JSONObject(intent.getExtras().getString("com.parse.Data"));

                notificationText = json.getString("alert");

            } catch (JSONException e) {
                Log.d(TAG, "JSONException: " + e.getMessage());

        }
    }

}

更新：现在我可以打开活动没问题，但无法提取推送通知消息，将其置于提醒对话框中，并显示提醒对话框。

Answer 1

给予BroadcastReceiver的Context无法显示Dialog。

听起来你应该遵循使用NotificationManager显示通知的标准模式。这是更标准的体验以及您的用户期望的内容。

以下链接将显示通知示例的文档，并且需要阅读整页以了解可用的不同选项。

http://developer.android.com/guide/topics/ui/notifiers/notifications.html#SimpleNotification

Answer 2

  public class scb998 extends Application { // this could be any singleton class not just application
    static boolean scb988b; // its false by default, but feel free to instatiate it
    static String msg = ""; // this came after the edit
   }

然后在你的接收器类之后context.startActivity(i);触发你的布尔值为true ..然后按照我的评论...实际上就是它..你也可以通过意图函数putString将字符串传递给活动一个静态单例字符串变量无论如何Sir ..

实际上这只是代表...大声笑..

在您的最后评论后编辑

整个故事是你正在尝试显示一个对话框，当收到一个消息时 - 但是你不能在你的接收器中这样做，所以你所做的就是与你的活动沟通时，让它知道一个收到了新的msg，有很多方法可以做到，从otto开始到local broadcast manager，您可以自己学习这些，或者使用我的这种简单方法，扩展应用程序类，并且像我一样放置一个静态布尔..不要把它放在Receiver你也可以为你的noty消息Scb998.msg = notificationText = json.getString("alert");创建一个静态字符串，然后在context.startActivity(i);之后设置你的布尔值Scb998 .scb988b = true ;,之后删除并将其放入您的活动

 void calalert(){
       AlertDialog Alert= new AlertDialog.Builder(this)
        .setTitle("News")
        .setMessage(Scb998.msg)
        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int which){
            }
        })
        .show();
        Scb998.scb988b = false;
 }

现在在你的Home类中调用它onresume并检查boolean

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    if(Scb998.scb988b)
        calalert();
}

Answer 3

只需使用YOUR-ACTIVITY-NAME.this作为警报构建器上下文。

更正后的表格，例如：

 AlertDialog Alert= new AlertDialog.Builder(YOUR-ACTIVITY-NAME.this)

无法添加窗口 - 令牌null不适用于应用程序

3 个答案: