Layout_Weight:
The Layout Attribute weight specify the size of Child views in a container. For example, if we want to place two buttons horizontally by occupying each half of the screen width, we can define layout weight as 0.5 for each button inside the Layout.
android:layout_weight="0.5"
Example:
Let's design two Linear Layout vertically, The first one designed without weight attribute and the second one using weight Property.
WeightSum: In Order to use Weight Property, weightSum attribute is required. WeightSum is the sum of all the child attributes weight.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:weightSum="3">
<Button
android:layout_weight="1" />
<Button
android:layout_weight="1" />
<Button
android:layout_weight="1" />
</LinearLayout>
In Above Example, the sum of weight is 3.
<!-- Without Using Weight attribute -->
<?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="wrap_content"
android:orientation="vertical">
<!-- vertical Orientation set -->
<!-- Child Views (In this case we have 3 Button) are here -->
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button1"
android:id="@+id/button"
android:background="#008080" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button2"
android:id="@+id/button2"
android:background="#08f9bd" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button3"
android:id="@+id/button3"
android:background="#f418d2" />
</LinearLayout>
<?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:weightSum="3"
android:orientation="vertical">
<!-- Child Views (In this case we have 3 Button) are here -->
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button 1"
android:background="#008080"
android:layout_weight="1" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button 2"
android:background="#08f9bd"
android:layout_weight="1" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button 3"
android:background="#f418d2"
android:layout_weight="1" />
</LinearLayout>
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