ViewPager blank on back from another fragment

This is my Solution and i have searched a lot of the answer so if you got a better one please share it with me..

i switched the ViewPager to the Activity

Activity XML

<RelativeLayout ....
   xmlns.

<FrameLayout 
    android:id="@+id/container"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
 />

 <android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
 </...viewPager>

Activity Class

public MainActivity extends Activity .... {

   private boolean mShowPager;
   private FrameLayout mContainer;
   private ViewPager mPager;

   //Inflate them


  public void showViewPager() {
        mPager.setVisibility(View.Visible);
        mContainer.setVisibilty(View.Gone);
  }

  public void showContainer() {
        mContainer.setVisibility(View.Visible);
        mPager.setVisibilty(View.Gone);
  }


  public void showViewPager(boolean show) {
       mShowPager = show;
  }


  @override
  public void onBackPressed() {

        if(mShowPager) {
             showViewPager();
        }
        super.onBackPressed();

Fragment Example

  public void onAttach(Activity activity) {

         ((MainActivity)activity).showViewPager(true);
         ((MainActivity)activity).showContainer();

//True means when back pressed back show ViewPager //Back means still show Container but do Back pressed Info : you decide what you want to show ViewPager or the Container that contain the Fragments plus you can use the BackStack if needed.

Hope it helps its helped me.

I got an answer by my self on debugging. Problem was I was using fragmentPager inside fragment so there for adapter initialization we have to pass getChildFragmentManager() instead of getFragmentManager()