Question

我需要访问对话框内的TextView才能更改其属性。我的代码如下：

public Dialog onCreateDialog(Bundle savedInstanceState) {

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    LayoutInflater inflater = getActivity().getLayoutInflater();
    final View view = inflater.inflate(R.layout.dialog_execute, null);

    builder.setMessage("Execute").setView(view)
            .setPositiveButton("Execute", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    filename = view.findViewById(R.id.filename);
                    [...]

当我运行它时，我得到：

java.lang.ClassCastException: android.support.constraint.ConstraintLayout cannot be cast to android.widget.TextView

xml是：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/dialogXfilename"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TextView
    android:id="@+id/textView3"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:textAlignment="center"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:text="notepad.exe"/>

[...]

</android.support.constraint.ConstraintLayout>

我尝试更改布局类型，但是执行代码后应用仍然崩溃

Answer 1

我刚刚意识到

android:id="@+id/dialogXfilename"

在布局中不是文本视图，这很糟糕

Android自定义对话框在ConstraintLayout中进入视图

1 个答案: