...
    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

dialog.getWindow().setLayout(WindowManager.LayoutParams.MATCH_PARENT,WindowManager.LayoutParams.WRAP_CONTENT);

public static WindowManager.LayoutParams setDialogLayoutParams(Activity activity, Dialog dialog)
    {
        try 
        {
            Display display = activity.getWindowManager().getDefaultDisplay();
            Point screenSize = new Point();
            display.getSize(screenSize);
            int width = screenSize.x;

            WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
            layoutParams.copyFrom(dialog.getWindow().getAttributes());
            layoutParams.width = (int) (width - (width * 0.07) ); 
            layoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
            return layoutParams;
        } 
        catch (Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }

到目前为止我能想到的最简单的方法

如果你的对话框是由垂直线性布局组成的，只需添加一个“高度填充”虚拟视图，它将占据屏幕的整个高度。

例如:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:weightSum="1">

    <EditText
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:id="@+id/editSearch" />

    <ListView
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:id="@+id/listView"/>


   <!-- this is a dummy view that will make sure the dialog is highest -->
   <View
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:layout_weight="1"/>

</LinearLayout>

注意LinearLayout属性中的android:weightSum="1"和dummy View属性中的android:layout_weight="1"

我的答案是基于koma的，但它不需要覆盖onStart，但只需要onCreateView，当你创建新的片段时，默认情况下几乎总是被覆盖。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.your_fragment_layout, container);

    Rect displayRectangle = new Rect();
    Window window = getDialog().getWindow();
    window.getDecorView().getWindowVisibleDisplayFrame(displayRectangle);

    v.setMinimumWidth((int)(displayRectangle.width() * 0.9f));
    v.setMinimumHeight((int)(displayRectangle.height() * 0.9f));

    return v;
}

我在Android 5.0.1上进行了测试。

让你的对话成为一种活动。3个步骤

步骤1: 将其中一个放在styles.xml中

风格: 我喜欢这个，因为你可以将父主题更改为你的主题的名称，你将在你的应用程序的其余部分使用。

<style name="DialogTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowBackground">@color/transparent</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:windowMinWidthMajor">90%</item>
    <item name="android:windowMinWidthMinor">90%</item>
</style>

方式二:

<style name="DialogTheme" parent="Theme.AppCompat.Dialog">
    <item name="android:windowMinWidthMajor">90%</item>
    <item name="android:windowMinWidthMinor">90%</item>
</style>

步骤2: 然后把它放在AndroidManifest.xml中

<activity
    android:name="com.example.YourApp.DialogActivity"
    android:theme="@style/DialogTheme" />

步骤3: 确保你的主布局宽度fill_parent或match_parent在activity_dialog.xml中

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:layout_width="fill_parent"
    android:layout_height="wrap_content"
    tools:context=".DialogActivity">

</androidx.constraintlayout.widget.ConstraintLayout>