错误的窗口令牌，您无法在创建 Activity 之前或隐藏之后显示对话框 [英] Bad window token, you cannot show a dialog before an Activity is created or after it's hidden

问题描述

我在我的应用程序中使用 AppIntro 库.

I am using an AppIntro library in my app.

它有 3 张幻灯片.当显示第三张幻灯片时，我想问用户一些事情.为了实现这一点，我正在使用 afollestad 的材质对话框.

It has 3 slides. I want to ask the user something when the third slide is shown. To achieve that I am using material dialogs by afollestad.

我在 AppIntro Activity 中的代码如下所示:

My code in the AppIntro Activity looks like that:

@Override
    public void onNextPressed() {
        if(this.pager.getCurrentItem() == 2) {
            MaterialDialog dialog = new MaterialDialog.Builder(getApplicationContext())
                    .title("QR Code scannen")
                    .content("Möchtest du den QR Code scannen oder selbst eingeben?")
                    .positiveText("eingeben")
                    .negativeText("scannen")
                    .onPositive(new MaterialDialog.SingleButtonCallback() {
                        @Override
                        public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
                            Intent intent = new Intent(getApplicationContext(), RegistrationActivity.class);
                            startActivity(intent);
                        }
                    })
                    .onNegative(new MaterialDialog.SingleButtonCallback() {
                        @Override
                        public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
                            // TODO
                        }
                    })
                    .show();
        }
    } 

运行应用程序当我滑到第三张幻灯片时出现以下问题:

Running the App I get the following issue when I slide to the third slide:

com.afollestad.materialdialogs.MaterialDialog$DialogException: 
Bad window token, you cannot show a dialog before an Activity is created or after it's hidden.
at com.afollestad.materialdialogs.MaterialDialog.show(MaterialDialog.java:1328)
at com.afollestad.materialdialogs.MaterialDialog$Builder.show(MaterialDialog.java:1317)
at com.ads.adstimer.fragment.Registration.RegistrationActivity.onNextPressed(RegistrationActivity.java:64)
at com.github.paolorotolo.appintro.AppIntro$2.onClick(AppIntro.java:118)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21153)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我真的不明白这个问题.因为 AppIntro Activity 已经加载，我希望它在显示特定片段时显示一个对话框.

I do not really understand the problem. Because the AppIntro Activity is already loaded and I expect it to show a dialog when a specific fragment is shown.

如何实现在显示特定幻灯片时显示对话框?

How can I achieve to show a dialog when a specific slide is shown?

推荐答案

MaterialDialog dialog = new MaterialDialog.Builder(getApplicationContext())

我想你需要在这里传递 Activity 实例，而不是应用程序上下文.

I suppose you need to pass the Activity instance here, not the application context.

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