Replace one fragment with an another fragment

Question

I want to replace an old Fragment with a new Fragment, but i still get the buttons of the old Fragment that is still visible in the ne

Answer 1

Try the following code.

A) Create Activity as follows :

MainActivity

import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements ShowNextFragment{


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    FragmentA fragmentA=new FragmentA();
    FragmentTransaction fragmentTransaction=getFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.container,fragmentA);
    fragmentTransaction.addToBackStack("A");
    fragmentTransaction.commitAllowingStateLoss();

}

@Override
public void showFragment() {
    FragmentB fragmentB=new FragmentB();
    FragmentTransaction fragmentTransaction=getFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.container,fragmentB);
    fragmentTransaction.addToBackStack("B");
    fragmentTransaction.commitAllowingStateLoss();
}
}

B) Create 2 fragments as follows :

Fragment A

 import android.app.Fragment;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;


public class FragmentA extends Fragment {
private ShowNextFragment showNextFragment;



@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    try {

        showNextFragment=(ShowNextFragment)getActivity();
        Log.e("CAllback","Set");
    }catch (ClassCastException e){
        Log.e("Error","Please Implement ShowFragment Interface");
    }
    return inflater.inflate(R.layout.fragment_a,container,false);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    view.findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (showNextFragment!=null){
                showNextFragment.showFragment();
            }
        }
    });

}
}

Fragment B

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater; 
import android.view.View;
import android.view.ViewGroup;

public class FragmentB extends Fragment {



@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment_b,container,false);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);


}
}

C) Create an interface as follows

public interface ShowNextFragment {
void showFragment();
}

D) create following xmls as :

i) activity_main

ii) fragment_a

iii) fragment_b