Google Android - это несложно

Код: Выделить всё

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="0.4" >
        
        <ImageView
            android:contentDescription="@string/content_description_add_contact"
            android:id="@+id/addContact"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:scaleType="fitXY"
            android:src="@drawable/add_contact" />
        
        <ImageView
            android:id="@+id/Call"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:scaleType="fitXY"
            android:src="@drawable/call" />
        
        <ImageView
            android:id="@+id/Erase"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:scaleType="fitXY"
            android:src="@drawable/backspace" />
        
    </LinearLayout>
	
	...
	
</LinearLayout>

Код: Выделить всё

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

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:text="B1" >
    </Button>

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="3"
        android:text="B2" >
    </Button>

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:text="B3" >
    </Button>

</LinearLayout>