How to use Percentage for android layout?

Question

How can we use percentage values for android view elements? something like this

<TextView         android:id="@+id/"         android:layout_width="75%"         android:layout_height="50%"/> 

Answer 1

UPDATE 2018:

PercentRelativeLayout and PercentFrameLayout are deprecated. Consider using ConstraintLayout

Old Answer:

So far Android Support library has limited on where to use this:

1. with RelativeLayout

   android.support.percent.PercentRelativeLayout 

2. with FrameLayout

   android.support.percent.PercentFrameLayout 

How to use it?

Well, first make sure to include the dependency at build.grade(Module: app) in your android app.

dependencies {     compile 'com.android.support:percent:23.3.0' } 

Then navigate to your xml layout in this example (.MainActivity)

<android.support.percent.PercentRelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:app="http://schemas.android.com/apk/res-auto"   xmlns:tools="http://schemas.android.com/tools"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:paddingBottom="@dimen/activity_vertical_margin"   android:paddingLeft="@dimen/activity_horizontal_margin"   android:paddingRight="@dimen/activity_horizontal_margin"   android:paddingTop="@dimen/activity_vertical_margin"   tools:context=".MainActivity">     <Button     android:id="@+id/button"     android:text="Button"     android:layout_height="wrap_content"     android:layout_alignParentTop="true"     app:layout_widthPercent="30%"/>    <Button         android:id="@+id/button2"     android:text="Button 2"     android:layout_height="wrap_content"     android:layout_toRightOf="@id/button"     app:layout_widthPercent="60%"/>    <Button     android:id="@+id/button3"     android:text="Button 3"     android:layout_height="wrap_content"     android:layout_below="@+id/button"     android:layout_alignParentStart="true"     android:layout_alignParentLeft="true"     app:layout_widthPercent="90%"/>  </android.support.percent.PercentRelativeLayout> 

For more detail please check here: