android - PercentRelativeLayout not working -

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i'm trying use percentrelativelayout obtain ratio widget. if updated dependecies, doesn't seem android studio recognize library.

here gradle 

android { compilesdkversion 23 buildtoolsversion "23.0.3"  defaultconfig {     applicationid "com.cobaltsign.androidwidget"     minsdkversion 21     targetsdkversion 23     versioncode 1     versionname "1.0" } buildtypes {     release {         minifyenabled false         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'     } }}  dependencies { compile filetree(dir: 'libs', include: ['*.jar']) testcompile 'junit:junit:4.12' compile 'com.android.support:appcompat-v7:23.4.0' compile 'joda-time:joda-time:2.9.3' compile 'com.squareup.picasso:picasso:2.5.2' compile 'com.google.android.gms:play-services-appindexing:9.0.2' compile 'com.makeramen:roundedimageview:2.2.1'}  idea ?

you have import compile 'com.android.support:percent:23.3.0' in build.gradle. take @ 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%"/>


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