android - how to use external library within a fragment? -

plz how use external library(image slider library) inside fragment,when extending fragment error comes in findviewbyid & when extending fragmentactivity fragmentmanager not support it.

did add this?

dependencies {         compile "com.android.support:support-v4:+"         compile 'com.squareup.picasso:picasso:2.3.2'         compile 'com.nineoldandroids:library:2.4.0'         compile 'com.daimajia.slider:library:1.1.5@aar' } 

to gradle?

also, check if fragment imported support library.