警报对话框无法添加窗口错误

Question

I'm trying to create AlertDialog from RecyclerView.Adapter with this code

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(new ContextThemeWrapper(context, R.style.AppTheme));
alertDialogBuilder.setView(R.layout.reserve_dialog);
alertDialogBuilder.create();
alertDialogBuilder.show();

but I'm getting this error in logcat:

Theme: themes:{}
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

What is wrong?

Answer 1

Instead of getApplicationContext(), just use ActivityName.this.

   AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(new  ContextThemeWrapper(activity, R.style.AppTheme));
   alertDialogBuilder.setView(R.layout.reserve_dialog);
   alertDialogBuilder.create();
   if(!isFinishing()){
    alertDialogBuilder.show();
   }

Answer 2

you are passing context.getApplicationContext()

Instead of this pass activity context

    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(new ContextThemeWrapper(MainActivity.this, R.style.AppTheme));
    alertDialogBuilder.setView(R.layout.reserve_dialog);
    alertDialogBuilder.create();
    alertDialogBuilder.show();

Answer 3

删除getApplicationContext（）并传递活动上下文。

Answer 4

Inside New Dialogue(youractivity.this, style)

Hopefully it ll solved

Answer 5

If you are creating the dialog inside the RecylerView.Adapter , pass the activity object in the constructor of the Adapter and use the object itself when creating the builder -

    if (!activity.isFinishing()) {
      AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(new ContextThemeWrapper(activity, R.style.AppTheme));
      alertDialogBuilder.setView(R.layout.reserve_dialog);
      alertDialogBuilder.create();
      alertDialogBuilder.show();
    }

When you are displaying a dialog in a non activity class then you have to pass activity as a parameter.