您可以使用百分比(JUST)窗口对话框宽度。

看看这个来自Holo Theme的例子:

<style name="Theme.Holo.Dialog.NoActionBar.MinWidth">
    <item name="android:windowMinWidthMajor">@android:dimen/dialog_min_width_major</item>
    <item name="android:windowMinWidthMinor">@android:dimen/dialog_min_width_minor</item>
</style>

 <!-- The platform's desired minimum size for a dialog's width when it
     is along the major axis (that is the screen is landscape).  This may
     be either a fraction or a dimension. -->
<item type="dimen" name="dialog_min_width_major">65%</item>

你所需要做的就是扩展这个主题，并将“Major”和“Minor”的值改为90%而不是65%。

的问候。

尝试将你的自定义对话框布局包装成RelativeLayout而不是LinearLayout。这对我很管用。

实际90%计算解:

@Override public void onStart() {
   Dialog dialog = getDialog();
   if (dialog != null) {
     dialog.getWindow()
        .setLayout((int) (getScreenWidth(getActivity()) * .9), ViewGroup.LayoutParams.MATCH_PARENT);
   }
}

其中getScreenWidth(Activity Activity)定义如下(最好放在Utils类中):

public static int getScreenWidth(Activity activity) {
   Point size = new Point();
   activity.getWindowManager().getDefaultDisplay().getSize(size);
   return size.x;
}

只要给AlertDialog这个主题

<style name="DialogTheme" parent="Theme.MaterialComponents.Light.Dialog.MinWidth">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="android:windowMinWidthMajor">90%</item>
    <item name="android:windowMinWidthMinor">90%</item>
</style>

您可以使用百分比(JUST)窗口对话框宽度。

看看这个来自Holo Theme的例子:

<style name="Theme.Holo.Dialog.NoActionBar.MinWidth">
    <item name="android:windowMinWidthMajor">@android:dimen/dialog_min_width_major</item>
    <item name="android:windowMinWidthMinor">@android:dimen/dialog_min_width_minor</item>
</style>

 <!-- The platform's desired minimum size for a dialog's width when it
     is along the major axis (that is the screen is landscape).  This may
     be either a fraction or a dimension. -->
<item type="dimen" name="dialog_min_width_major">65%</item>

你所需要做的就是扩展这个主题，并将“Major”和“Minor”的值改为90%而不是65%。

的问候。

    ...
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    Dialog d = builder.create(); //create Dialog
    d.show(); //first show

    DisplayMetrics metrics = new DisplayMetrics(); //get metrics of screen
    getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);
    int height = (int) (metrics.heightPixels*0.9); //set height to 90% of total
    int width = (int) (metrics.widthPixels*0.9); //set width to 90% of total

    d.getWindow().setLayout(width, height); //set layout