MaterialAlertDialogBu​​ilder 在自定义视图 editText 上崩溃

Question

尝试读取 editText 内容时 AlertDialog(Material) 崩溃。

警报对话框：

MaterialAlertDialogBuilder(activity)
            .setTitle(title)
            .setMessage(message)
            .setView(R.layout.dialog_settings_entry)
            .setPositiveButton(getString(R.string.text_change)) { dialog, which ->
                etUserInput.hint = message
                sgr = etUserInput.text.toString() // << crashes here
                dialog.dismiss()
            }
            .setNegativeButton(getString(android.R.string.cancel)) { dialog, _ ->
                dialog.dismiss()
            }
            .show()

单击肯定按钮结果如下：

    java.lang.IllegalStateException: etUserInput must not be null
        at com.home.profile.SettingsFragment$buildAlertDialog$1.onClick(SettingsFragment.kt:332)
        at androidx.appcompat.app.AlertController$ButtonHandler.handleMessage(AlertController.java:167)

该etUserInput是在一个单独的布局简单EDITTEXT。不确定崩溃原因。希望对它有任何了解或任何有用的材料样本。

Answer 1

将 投射DialogInterface到 anAlertDialog然后使用findViewById。

科特林：

val et = (dialog as? AlertDialog)?.findViewById<EditText>(R.id.etUserInput)
val text = et?.text.toString()

——

爪哇：

EditText et = ((AlertDialog)dialog).findViewById(R.id.etUserInput);
String text = et.getText().toString();

——

MaterialAlertDialogBuilder(activity)
            .setTitle(title)
            .setMessage(message)
            .setView(R.layout.dialog_settings_entry)
            .setPositiveButton(getString(R.string.text_change)) { dialog, which ->
                val text = (dialog as? AlertDialog)?.findViewById<EditText>(R.id.etUserInput)?.text?.toString()

                dialog.dismiss()
            }
            .setNegativeButton(getString(android.R.string.cancel)) { dialog, _ ->
                dialog.dismiss()
            }
            .show()