Unable to replace/navigate fragments

Question

I am trying to navigate from one fragment to another. These two fragments are 100% different, there is no ViewPager or something like that to connect them. Here

Answer 1

You are trying to replace firstView with the new fragment, but firstView is not a fragment, its' a RelativeLayout.

You cannot replace a fragment defined statically in the layout file. You can only replace fragments that you added dynamically via a FragmentTransaction.

None of your Layout contains fragment in layout.

<fragment
        android:id="@+id/fragment1"
        android:layout_width="march_parent"
        android:layout_height="match_parent"></fragment>

A new Fragment will replace an existing Fragment that was previously added to the container.

Take look on this.

Answer 2

If you need to replace one fragment with another then fallow undermentioned :

TalkDetail fragment = new TalkDetail(); 
// TalkDetail is name of fragment which you need to put while replacing older one.
Bundle bundle = new Bundle();

                    bundle.putString("title", m_ArrayList.get(arg2).title);
                    bundle.putString("largeimg", m_ArrayList.get(arg2).largeimg);
                    bundle.putString("excert", m_ArrayList.get(arg2).excert);
                    bundle.putString("description", m_ArrayList.get(arg2).description);
                    bundle.putString("cat", m_ArrayList.get(arg2).cat);
                    bundle.putString("header_title", "Talk");
                    //bundle.putInt("postid", m_ArrayList.get(arg2).postid);

                    fragment.setArguments(bundle);                  ((BaseContainerFragment)getParentFragment()).replaceFragment(fragment, true);

Here's your BaseContainerFragment.java class that will manage a lot of stuff for you.

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import app.drugs.talksooner.R;

public class BaseContainerFragment extends Fragment {

    public void replaceFragment(Fragment fragment, boolean addToBackStack) {
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        if (addToBackStack) {
            transaction.addToBackStack(null);
        }
        transaction.replace(R.id.container_framelayout, fragment);
        transaction.commit();
        getChildFragmentManager().executePendingTransactions();
    }

    public boolean popFragment() {
        Log.e("test", "pop fragment: " + getChildFragmentManager().getBackStackEntryCount());
        boolean isPop = false;
        if (getChildFragmentManager().getBackStackEntryCount() > 0) {
            isPop = true;
            getChildFragmentManager().popBackStack();
        }
        return isPop;
    }

}

For more specific details find my complete post over here ..

Dynamically changing the fragments inside a fragment tab host?