public void onResume() {

    Window window = Objects.requireNonNull(getDialog()).getWindow();
    Point size = new Point();
    assert window != null;
    Display display = window.getWindowManager().getDefaultDisplay();
    display.getSize(size);
    window.setLayout( (int)(size.x * 0.9), (int) (size.y * 0.75));
    window.setGravity( Gravity.CENTER );
    super.onResume();
    

}

Working on Android 6.0, ran into the same issue. AlertDialog would default to predefined width set in the theme regardless of the actual width set in the custom view's root Layout. I was able to get it to set properly adjusting the width of the loading_message TextView. Without investigating further, it seems that sizing the actual elements and having the root Layout wrap around them makes it work as expected. Below is an XML layout of a loading dialog which sets width of the the dialog correctly. Using the this library for the animation.

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@color/custom_color"
    android:padding="@dimen/custom_dimen">
    <com.github.rahatarmanahmed.cpv.CircularProgressView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/progress_view"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_centerHorizontal="true"
        app:cpv_color="@color/white"
        app:cpv_animAutostart="true"
        app:cpv_indeterminate="true" />
    <TextView
        android:id="@+id/loading_message"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/progress_view"
        android:layout_centerHorizontal="true"
        android:gravity="center"
        android:textSize="18dp"
        android:layout_marginTop="@dimen/custom_dimen"
        android:textColor="@color/white"
        android:text="@string/custom_string"/>
</RelativeLayout>

使用RelativeLayout作为DialogFragment的父元素

在我的例子中，DialogFragment占用了完整的活动大小，就像一个Fragment一样。DialogFragment基于xml布局，而不是AlertDialog。我的错误在于将对话片段作为常规片段添加到FragmentManager中:

fragmentManager?.beginTransaction()?.run {
    replace(R.id.container, MyDialogFragment.newInstance(), MyDialogFragment.TAG)
    addToBackStack(MyDialogFragment.TAG)
}?.commitAllowingStateLoss()

相反，我需要显示对话片段:

val dialogFragment = MyDialogFragment.newInstance()
fragmentManager?.let { dialogFragment.show(it, MyDialogFragment.TAG) }

经过一些编辑(我在布局中有ViewPager2)，对话框片段变得太窄:

我使用了N1hk的解决方案:

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)

    dialog?.window?.attributes?.width = ViewGroup.LayoutParams.MATCH_PARENT
    dialog?.window?.attributes?.height = ViewGroup.LayoutParams.MATCH_PARENT
}

现在它已经定义了宽度和高度，而不是完整的活动大小。

我想说onCreateView和onCreateDialog。如果你有一个基于布局的对话片段，你可以使用这两种方法中的任何一种。

If you use onCreateView, then you should use onActivityCreated to set width. If you use onCreateDialog instead of onCreateView, you can set parameters there. onActivityCreated won't be needed. override fun onCreateDialog(savedInstanceState: Bundle?): Dialog { super.onCreateDialog(savedInstanceState) val view = activity?.layoutInflater?.inflate(R.layout.your_layout, null) val dialogBuilder = MaterialAlertDialogBuilder(context!!).apply { // Or AlertDialog.Builder(context!!).apply setView(view) // setCancelable(false) } view.text_view.text = "Some text" val dialog = dialogBuilder.create() // You can access dialog.window here, if needed. return dialog }

早期的一个解决方案几乎起作用了。我尝试了一些稍微不同的方法，结果对我有用。

(一定要看他的解决方案) 这就是他的解决办法。点击这里 除了builder.getContext(). gettheme (). applystyle (R.style。Theme_Window_NoMinWidth,真正的);

我把它改成

 @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {


        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        // Get layout inflater
        LayoutInflater layoutInflater = getActivity().getLayoutInflater();

        // Set layout by setting view that is returned from inflating the XML layout
        builder.setView(layoutInflater.inflate(R.layout.dialog_window_layout, null));


        AlertDialog dialog = builder.create();

        dialog.getContext().setTheme(R.style.Theme_Window_NoMinWidth);

最后一行是真正的不同之处。

设置自定义对话框布局的父布局为RelativeLayout，自动获取公共宽度和高度。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">