Develop android app using Navigation Drawer in Android Studio

Question

I'm using android studio 1.1.0 to develop an app with navigation drawer activity. To develop this app I refer this video in you tube.

when I create objFragment it automatically convert as android.app.Fragment objFragment = null; But in video it show as Fragment objFragment = null; At the 6.00 min of the video it replace placeHolderFragment(position +1) with objFragment which is created before. When doing this I got the following error.

How can I fixed this error.

Answer 1

Finally I have found the answer.

I replace

android.app.Fragment objFragment = null

by

android.support.v4.app.Fragment objFragment = null

and import android.app.Fragment; by import android.support.v4.app.Fragment; in all the java class files.