java - 警报对话框无法添加窗口错误

Question

我正在尝试使用此代码从 RecyclerView.Adapter 创建 AlertDialog

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

但我在 logcat 中收到此错误:

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

出了什么问题？

Answer 1

you are passing context.getApplicationContext()

而不是传递 Activity 上下文

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