android.support.v7.widget.cardview cannot be found -

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i'm using android studio 1.2.2 , attempting use cardview in layout, preview giving me warning class android.support.v7.widget.cardview not found. question has been asked various times, , have looked @ these solutions:

error when adding cardview layout

android.support.v7.widget.cardview not found (android studio 1.1 preview)

but none of them have answer. have added gradle:

dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     compile 'com.android.support:cardview-v7:21.0.+' }

and have added layout:

xmlns:card_view="http://schemas.android.com/apk/res-auto"

which pretty sums answers given on 2 similar questions asked, still getting same error, , when run on device, cardview doesn't show @ all. can point out other possible solutions?

by way, minsdkversion 21.

layout:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="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:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" android:paddingbottom="@dimen/activity_vertical_margin"  tools:context="integraloftan.cardview.main">  <android.support.v7.widget.cardview     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:elevation="100dp"     card_view:cardcornerradius="8dp"> </android.support.v7.widget.cardview>

and gradle:

apply plugin: 'com.android.application'  android {     compilesdkversion 22     buildtoolsversion "21.1.2"      defaultconfig {         applicationid "integraloftan.match"         minsdkversion 21         targetsdkversion 22         versioncode 1         versionname "1.0"     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     compile 'com.android.support:cardview-v7:22.2.0' }

first of all, sorry if made unclear: set buildtoolsversion 22.0.1
secondly, cardview doesn't have children , height set wrap_content, that's why don't see anything. try setting height fixed value 100dp , see if appears.


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