PercentRelativeLayout

This package is part of the Android support library which is no longer maintained. The support library has been superseded by AndroidX which is part of Jetpack. We recommend using the AndroidX libraries in all new projects. You should also consider migrating existing projects to AndroidX.

public class PercentRelativeLayout

extends RelativeLayout

This class was deprecated in API level 26.1.0.

consider using ConstraintLayout and associated layouts instead. The following shows how to replicate the functionality of percentage layouts with a ConstraintLayout. The Guidelines are used to define each percentage break point, and then a Button view is stretched to fill the gap:

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.constraint.Guideline android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/left_guideline" app:layout_constraintGuide_percent=".15" android:orientation="vertical"/> <android.support.constraint.Guideline android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/right_guideline" app:layout_constraintGuide_percent=".85" android:orientation="vertical"/> <android.support.constraint.Guideline android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/top_guideline" app:layout_constraintGuide_percent=".15" android:orientation="horizontal"/> <android.support.constraint.Guideline android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/bottom_guideline" app:layout_constraintGuide_percent=".85" android:orientation="horizontal"/> <Button android:text="Button" android:layout_width="0dp" android:layout_height="0dp" android:id="@+id/button" app:layout_constraintLeft_toLeftOf="@+id/left_guideline" app:layout_constraintRight_toRightOf="@+id/right_guideline" app:layout_constraintTop_toTopOf="@+id/top_guideline" app:layout_constraintBottom_toBottomOf="@+id/bottom_guideline" /> </android.support.constraint.ConstraintLayout> Subclass of RelativeLayout that supports percentage based dimensions and margins. You can specify dimension or a margin of child by using attributes with "Percent" suffix. Follow this example: <android.support.percent.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView app:layout_widthPercent="50%" app:layout_heightPercent="50%" app:layout_marginTopPercent="25%" app:layout_marginLeftPercent="25%"/> </android.support.percent.PercentRelativeLayout> The attributes that you can use are:

layout_widthPercent

layout_heightPercent

layout_marginPercent

layout_marginLeftPercent

layout_marginTopPercent

layout_marginRightPercent

layout_marginBottomPercent

layout_marginStartPercent

layout_marginEndPercent

layout_aspectRatio

layout_width/height

layout_widthPercent.

layout_width/height="wrap_content"

wrap_content

It is not necessary to specifyif you specifyHowever, if you want the view to be able to take up more space than what percentage value permits, you can add. In that case if the percentage size is too small for the View's content, it will be resized usingrule.

You can also make one dimension be a fraction of the other by setting only width or height and using layout_aspectRatio for the second one to be calculated automatically. For example, if you would like to achieve 16:9 aspect ratio, you can write:

android:layout_width="300dp" app:layout_aspectRatio="178%"

Summary

This will make the aspect ratio 16:9 (1.78:1) with the width fixed at 300dp and height adjusted accordingly.