在进度造成AsynchTask崩溃,"无法添加窗口 - 令牌null不是一个申请表] [英] progressBar in AsynchTask causes crash, "Unable to add window -- token null is not for an application"
问题描述
在我的应用程序,我试图展现一个繁忙的指标,当我连接到服务器,所以我创建 AsynchTask
与对话框
与进度
。
在运行时,当我尝试连接到服务器时,应用程序crashs,走出了贴在下面 LogCat中
现在看来,这与<$ C $问题C>对话框,但我不知道究竟是什么导致错误。
应用程序是在横向模式下使用 navigationdrawer
请看看在上preExecute
方法和的logcat
的错误。
在preExecute
@覆盖
在preExecute保护无效(){
// TODO自动生成方法存根
super.on preExecute();
对话框=新的对话框(getApplicationContext());
dialog.setCancelable(假);
//dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.progressdialog);
进度=(进度)dialog.findViewById(R.id.progressBar1);
dialog.show();
}
LogCat中
E / AndroidRuntime(20575):工艺:com.example.mqtt_designlayout_02,PID:20575
E / AndroidRuntime(20575):$ android.view.WindowManager BadTokenException:无法添加窗口 - 令牌null不是一个应用程序
E / AndroidRuntime(20575):在android.view.ViewRootImpl.setView(ViewRootImpl.java:731)
E / AndroidRuntime(20575):在android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:278)
E / AndroidRuntime(20575):在android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
E / AndroidRuntime(20575):在android.app.Dialog.show(Dialog.java:288)
E / AndroidRuntime(20575):在com.example.mqtt_designlayout_02.MainActivity $ BusyIndicator.on preExecute(MainActivity.java:768)
E / AndroidRuntime(20575):在android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
E / AndroidRuntime(20575):在android.os.AsyncTask.execute(AsyncTask.java:535)
E / AndroidRuntime(20575):在com.example.mqtt_designlayout_02.MainActivity.connectionIndicator(MainActivity.java:468)
E / AndroidRuntime(20575):在com.example.mqtt_designlayout_02.MainActivity.MQTTConnect(MainActivity.java:460)
E / AndroidRuntime(20575):在com.example.mqtt_designlayout_02.MainActivity.MQTT_Connection_Module(MainActivity.java:558)
E / AndroidRuntime(20575):在com.example.mqtt_designlayout_02.MainActivity.access $ 0(MainActivity.java:548)
E / AndroidRuntime(20575):在com.example.mqtt_designlayout_02.MainActivity $ 1.onClick(MainActivity.java:79)
E / AndroidRuntime(20575):在android.view.View.performClick(View.java:4626)
E / AndroidRuntime(20575):在android.view.View $ PerformClick.run(View.java:19293)
E / AndroidRuntime(20575):在android.os.Handler.handleCallback(Handler.java:733)
E / AndroidRuntime(20575):在android.os.Handler.dispatchMessage(Handler.java:95)
E / AndroidRuntime(20575):在android.os.Looper.loop(Looper.java:157)
E / AndroidRuntime(20575):在android.app.ActivityThread.main(ActivityThread.java:5293)
E / AndroidRuntime(20575):在java.lang.reflect.Method.invokeNative(本机方法)
E / AndroidRuntime(20575):在java.lang.reflect.Method.invoke(Method.java:515)
E / AndroidRuntime(20575):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1265)
E / AndroidRuntime(20575):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
E / AndroidRuntime(20575):在dalvik.system.NativeStart.main(本机方法)
我很抱歉,但我从和取缔。所以您的解决方案就是,
更改以下行,
对话框=新的对话框(的getParent());
看一看在这个博客帖子:的 http://possiblemobile.com/2013/06/context/ 和其中示出不同的上下文之间的比较向下滚动。
您正在使用的应用程序上下文:结果对话框=新的对话框(getApplicationContext());
结果
显示对话框,但是应用程序上下文无法做到这一点。
使用而不是活动场景。
更新参照您的评论:结果
您可以在活动实例传递给的AsyncTask
通过构造函数接受上下文
参数。
例如:
公共类MyAsyncTask扩展的AsyncTask&LT;&GT; {
私人上下文的背景下; 公共MyAsyncTask(上下文的背景下){
this.context =背景;
} //然后在preExecute使用环境
//对话框=新的对话框(背景);
}
和你这样的活动打电话给你的AsyncTask
新MyAsyncTask(本).execute();
//'这'是当前的活动实例。
//和活动扩展了上下文,因此,它是一个上下文。
in my App, i am trying to show a busy indicator while i am connecting to a server, so I created AsynchTask
with dialog
with progressBar
.
At run time when i try to connect to the server, the App crashs, out of the below posted LogCat
it seems it is a problem with the dialog
but i do not know what causes the error exactly.
the app is in LandScape mode with navigationdrawer
please have a look at the onPreExecute
method and the logcat
errors.
onPreExecute:
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
dialog = new Dialog(getApplicationContext());
dialog.setCancelable(false);
//dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.progressdialog);
progressBar = (ProgressBar) dialog.findViewById(R.id.progressBar1);
dialog.show();
}
LogCat:
E/AndroidRuntime(20575): Process: com.example.mqtt_designlayout_02, PID: 20575
E/AndroidRuntime(20575): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
E/AndroidRuntime(20575): at android.view.ViewRootImpl.setView(ViewRootImpl.java:731)
E/AndroidRuntime(20575): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:278)
E/AndroidRuntime(20575): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
E/AndroidRuntime(20575): at android.app.Dialog.show(Dialog.java:288)
E/AndroidRuntime(20575): at com.example.mqtt_designlayout_02.MainActivity$BusyIndicator.onPreExecute(MainActivity.java:768)
E/AndroidRuntime(20575): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
E/AndroidRuntime(20575): at android.os.AsyncTask.execute(AsyncTask.java:535)
E/AndroidRuntime(20575): at com.example.mqtt_designlayout_02.MainActivity.connectionIndicator(MainActivity.java:468)
E/AndroidRuntime(20575): at com.example.mqtt_designlayout_02.MainActivity.MQTTConnect(MainActivity.java:460)
E/AndroidRuntime(20575): at com.example.mqtt_designlayout_02.MainActivity.MQTT_Connection_Module(MainActivity.java:558)
E/AndroidRuntime(20575): at com.example.mqtt_designlayout_02.MainActivity.access$0(MainActivity.java:548)
E/AndroidRuntime(20575): at com.example.mqtt_designlayout_02.MainActivity$1.onClick(MainActivity.java:79)
E/AndroidRuntime(20575): at android.view.View.performClick(View.java:4626)
E/AndroidRuntime(20575): at android.view.View$PerformClick.run(View.java:19293)
E/AndroidRuntime(20575): at android.os.Handler.handleCallback(Handler.java:733)
E/AndroidRuntime(20575): at android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime(20575): at android.os.Looper.loop(Looper.java:157)
E/AndroidRuntime(20575): at android.app.ActivityThread.main(ActivityThread.java:5293)
E/AndroidRuntime(20575): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(20575): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(20575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
E/AndroidRuntime(20575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
E/AndroidRuntime(20575): at dalvik.system.NativeStart.main(Native Method)
i am sorry but i am banned from and. so your solution is just, Change following line, dialog = new Dialog(getParent());
Have a look over this blog post: http://possiblemobile.com/2013/06/context/ , and scroll down where the comparison between different contexts is shown.
You are using application context:
dialog = new Dialog(getApplicationContext());
to show the dialog, but app context can't do that.
Use instead the activity context.
Update. With reference to your comment:
You can pass an activity instance to the AsyncTask
by making your constructor accept a Context
parameter.
Eg.:
public class MyAsyncTask extends AsyncTask<>{
private Context context;
public MyAsyncTask(Context context){
this.context = context;
}
// and then in onPreExecute use that context
// dialog = new Dialog(context);
}
And you call your AsyncTask from the activity like this:
new MyAsyncTask(this).execute();
// 'this' is the current instance of Activity.
// and Activity extends Context, so, it IS a Context.
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