***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
}

在初始化对话框对象并设置内容视图之后。这样做并享受。

(在这种情况下，我设置90%的宽度和70%的高度，因为宽度90%，它将超过工具栏)

DisplayMetrics displaymetrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int width = (int) ((int)displaymetrics.widthPixels * 0.9);
int height = (int) ((int)displaymetrics.heightPixels * 0.7);
d.getWindow().setLayout(width,height);
d.show();

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();

试试这个:

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

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。

    ...
    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