上面的许多答案都很好，但没有一个对我完全有效。所以我结合@nmr的答案得到了这个。

final Dialog d = new Dialog(getActivity());
        //  d.getWindow().setBackgroundDrawable(R.color.action_bar_bg);
        d.requestWindowFeature(Window.FEATURE_NO_TITLE);
        d.setContentView(R.layout.dialog_box_shipment_detail);

        WindowManager wm = (WindowManager) getActivity().getSystemService(Context.WINDOW_SERVICE); // for activity use context instead of getActivity()
        Display display = wm.getDefaultDisplay(); // getting the screen size of device
        Point size = new Point();
        display.getSize(size);
        int width = size.x - 20;  // Set your heights
        int height = size.y - 80; // set your widths

        WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
        lp.copyFrom(d.getWindow().getAttributes());

        lp.width = width;
        lp.height = height;

        d.getWindow().setAttributes(lp);
        d.show();

部分基于阿南德的回答。这对我来说很管用:

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    val fragmentActivity = requireActivity()
    val v = View.inflate(context, R.layout.fragment_about_dialog, null)
    val dialog = Dialog(fragmentActivity)
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
    dialog.setContentView(v)

    val wm = fragmentActivity.getSystemService(Context.WINDOW_SERVICE) as WindowManager 

    val display = if (VERSION.SDK_INT >= VERSION_CODES.R) {
        fragmentActivity.display
    } else {
        wm.defaultDisplay // deprecated in API 30
    }

    val size = Point()
    display?.getSize(size)

    val width = size.x - 50
    val height = size.y - 50
    val lp = WindowManager.LayoutParams()
    lp.copyFrom(dialog.window?.attributes)
    lp.width = width
    lp.height = height
    dialog.show()
    dialog.window?.attributes = lp
    
    return dialog
}

对于对话框布局使用constraintLayout:

<androidx.constraintlayout.widget.ConstraintLayout 
        android:id="@+id/dialogLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    ...
</androidx.constraintlayout.widget.ConstraintLayout>

结果:

这在改变屏幕方向时工作得很好。

获取设备宽度:

public static int getWidth(Context context) {
    DisplayMetrics displayMetrics = new DisplayMetrics();
    WindowManager windowmanager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    windowmanager.getDefaultDisplay().getMetrics(displayMetrics);
    return displayMetrics.widthPixels;
}

然后用它来制作对话90%的设备，

Dialog filterDialog = new Dialog(context, R.style.searchsdk_FilterDialog);

filterDialog.setContentView(R.layout.searchsdk_filter_popup);
initFilterDialog(filterDialog);
filterDialog.setCancelable(true);
filterDialog.getWindow().setLayout(((getWidth(context) / 100) * 90), LinearLayout.LayoutParams.MATCH_PARENT);
filterDialog.getWindow().setGravity(Gravity.END);
filterDialog.show();

你必须在显示之前设置对话框的高度和宽度(dialog.show())

所以，像这样做:

dialog.getWindow().setLayout(width, height);

//then

dialog.show()

得到这段代码，我做了一些改变:

dialog.getWindow().setLayout((int)(MapGeaGtaxiActivity.this.getWindow().peekDecorView().getWidth()*0.9),(int) (MapGeaGtaxiActivity.this.getWindow().peekDecorView().getHeight()*0.9));

但是，当设备改变位置时，对话框的大小也会改变。当度量发生变化时，您可能需要自己处理。 peekDecorView，暗示在活动中的布局是正确初始化的，否则你可以使用

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int wwidth = metrics.widthPixels;

为了得到屏幕大小

下面是我的自定义对话框宽度的变体:

DisplayMetrics displaymetrics = new DisplayMetrics();
mActivity.getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int width = (int) (displaymetrics.widthPixels * (ThemeHelper.isPortrait(mContext) ? 0.95 : 0.65));

WindowManager.LayoutParams params = getWindow().getAttributes();
params.width = width;
getWindow().setAttributes(params);

因此，根据设备方向(ThemeHelper.isPortrait(mContext))对话框的宽度将是95%(纵向模式)或65%(横向模式)。这比作者要求的要多一点，但对某些人来说可能有用。

你需要创建一个从Dialog扩展而来的类，并把这段代码放到你的onCreate(Bundle savedInstanceState)方法中。

对于对话框的高度，代码应该类似于此。

***In Kotlin You can Code like This : -*** 

fun customDialog(activity: Activity?, layout: Int): Dialog {
    val dialog = Dialog(activity!!)
    try {
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
        dialog.setCancelable(false)
        dialog.setContentView(layout)
        dialog.window!!.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
        dialog.window!!.setLayout(ConstraintLayout.LayoutParams.MATCH_PARENT, ConstraintLayout.LayoutParams.WRAP_CONTENT);
        dialog.show()
    } catch (e: Exception) {

    }
    return dialog
}