How to correctly set the size of the widget?

Question

Android

I need to make a 4x1 cell widget. For this I use a simple code:

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="250dp"
    android:minHeight="40dip"
    android:updatePeriodMillis="0"
    android:initialLayout="@layout/widget"
    android:configure="ru.bartwell.myapp.WidgetActivity" />

I'm testing it on two Genymotion virtual devices:

1. Google Nexus 7, 800x1280, Android
   
2. 4.4.4 Samsung Galaxy S5, 1080x1920, Android 4.4.4
   

And I get two different results:
With android:minWidth="250dp" and android:minHeight="40dip" (new formula):

1. Google Nexus 7 - 3x1
   
2. Samsung Galaxy S5 - 4x1
   

With android:minWidth="292dp" and android:minHeight="70dip" (old formula):

1. Google Nexus 7 - 4x1
   
2. Samsung Galaxy S5 - 4x2
   

As you can see, the size of the widget depends on the screen resolution and is calculated incorrectly anyway (either 3x1 or 4x2). So what is the right way to set the size of the widget?