Android : How to set application view to set for all android devices?

I am creating one application and I want my application to open without any issue with view,I tried to use weightsum attribute for that but I do not know why it shows different views all time in different devices,check this

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="vertical"
 android:background="@drawable/backgroundgd"
 android:weightSum="100.0"
 >
    <TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello_world" 
    android:background="@drawable/another"
    />
    <TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello_world" 
    android:background="@drawable/secondpart"
    />
 </LinearLayout>

in bluestack it looks like this