错误的窗口令牌，在创建活动之前或隐藏活动之后您将无法显示对话框

问题描述

我在我的应用程序中使用了 AppIntro库.

I am using an AppIntro library in my app.

它有3张幻灯片.当第三张幻灯片显示时，我想问用户一些问题.为此，我正在使用 afollestad的材料对话框.

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活动中的代码如下:

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();
        }
    }

运行该应用程序，当我滑动到第三张幻灯片时，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)

我不太了解这个问题.因为AppIntro活动已经加载，我希望在显示特定片段时会显示一个对话框.

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.

当显示特定幻灯片时，如何实现显示对话框?

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

推荐答案

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

我想您需要在这里传递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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