片段中的对话框崩溃了Android应用程序.android.view.WindowsManager $ BadTokenException

Question

我试图创建一个对话框,但当我尝试运行代码时它崩溃了.我想在我的listview中选择一个项目时运行它,这是我的片段,现在我只想尝试显示对话框而不传入任何内容

这是我的java代码:

        myInfoList.setAdapter(new CustomAdapter(details , getActivity().getApplicationContext()));

        myInfoList.setOnItemClickListener(new OnItemClickListener() {
               public void onItemClick(AdapterView<?> a, View v, int position, long id) {
                   //System.out.println("Name: "+details.get(position).getSub();
                   //String s = details.get(position).getDescription();
                   final Dialog dialog = new Dialog(getActivity().getApplicationContext());
                   dialog.setContentView(R.layout.purchase);
                   dialog.setTitle("Title");

                   Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
                    // if button is clicked, close the custom dialog
                    dialogButton.setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            dialog.dismiss();
                        }
                    });

                    dialog.show();
               }
       });

logcat的:

07-06 12:05:16.012: V/21st Polling:(12319): clicked
07-06 12:05:16.957: D/AndroidRuntime(12319): Shutting down VM
07-06 12:05:16.957: W/dalvikvm(12319): threadid=1: thread exiting with uncaught exception (group=0x40e20930)
07-06 12:05:16.972: E/AndroidRuntime(12319): FATAL EXCEPTION: main
07-06 12:05:16.972: E/AndroidRuntime(12319): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.view.ViewRootImpl.setView(ViewRootImpl.java:571)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:246)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.app.Dialog.show(Dialog.java:281)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at com.example.isellcrazyitem.SalesOrder$1.onItemClick(SalesOrder.java:104)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.widget.AdapterView.performItemClick(AdapterView.java:298)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.widget.AbsListView.performItemClick(AbsListView.java:1102)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2751)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.widget.AbsListView$1.run(AbsListView.java:3426)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.os.Handler.handleCallback(Handler.java:725)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.os.Looper.loop(Looper.java:137)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at android.app.ActivityThread.main(ActivityThread.java:5233)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at java.lang.reflect.Method.invokeNative(Native Method)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at java.lang.reflect.Method.invoke(Method.java:511)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
07-06 12:05:16.972: E/AndroidRuntime(12319):    at dalvik.system.NativeStart.main(Native Method)
07-06 12:05:18.613: I/Process(12319): Sending signal. PID: 12319 SIG: 9

Answer 1

更改以下行:

final Dialog dialog = new Dialog(getActivity().getApplicationContext());

至:

final Dialog dialog = new Dialog(getActivity());

对话框无法使用应用程序上下文进行实例化,因为两者具有不同的生命周期:对话框的生命周期与托管的生命周期绑定Activity.在SO上进行一个简单的搜索可能也会带来这个问题.

有关不同Context口味的解释以及何时(不)使用哪种口味,我建议阅读有关此主题的可能的移动博客文章.它还包含一个方便的表格供参考.

Answer 2

改变这个

final Dialog dialog = new Dialog(getActivity());

而不是这个

final Dialog dialog = new Dialog(getActivity().getApplicationContext());

当你通过上下文时,请记住.

1. 在片段中使用 getActivity()
2. 在活动中 YourActivity.this

原因是您无法通过不是Activity的Context显示应用程序窗口/对话框.尝试传递有效的活动参考.