android - cannot resolve symbol FileProvider -

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i trying test fileprovider tutorial.

it asks include in manifest :

<provider     android:name="android.support.v4.content.fileprovider"     android:authorities="com.mydomain.fileprovider"     android:exported="false"     android:granturipermissions="true"> </provider>

in manifest, error:

 cannot resolve symbol fileprovider

i followed these instructions, add v4 support library android studio. add following build.gradle file, gradle sync fails :

 compile "com.android.support:support-v4:18.0.+"

what must resolve problem ?

go file > invalidate caches / restart , invalidate , restart.


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