Android FragmentTransaction commit already called

You are beginning the FragmentTransaction outside of the OnItemClickListener. Thus you are attempting to commit() a single FragmentTransaction every time the user clicks an item in your ListView.

You need to begin a new FragmentTransaction every time you intend to perform any number of Fragment operations.

A simple fix would look like this:

f1_fragment  = new F1_Fragments();f2_fragment = new F2_Fragments();listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {    @Override    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {        FragmentTransaction fragmentTransaction =getFragmentManager().beginTransaction();        parent.getItemAtPosition(position);        if(position==0){            fragmentTransaction.replace(android.R.id.content, f1_fragment);        }else{            fragmentTransaction.replace(android.R.id.content, f2_fragment);        }        fragmentTransaction.addToBackStack(null);        fragmentTransaction.commit();    }});

you can use this method for replace fragment with each other just call this

do those are global

YourFragment1 frg1 = new   YourFragment1 ();    YourFragment2 frg1 = new   YourFragment2 (); 

And then call it by

openFragment(frg1); 

or

  openFragment(frg2);

OpenFragment:

  private void openFragment(final Fragment fragment)   {    FragmentManager fragmentManager = getSupportFragmentManager();    FragmentTransaction transaction = fragmentManager.beginTransaction();            transaction.replace(R.id.container, fragment);    transaction.addToBackStack(null);    transaction.commit();}

Look at this scenario

I need to add new fragment on every list item click. Just initialise fragment transaction on every item click.

switch (v.getId()) {                case R.id.tvaddExpense:                    fragmentTransaction = getFragmentManager().beginTransaction();                    fragmentTransaction.add(R.id.containerFucntionsList, new Fragment1());                    fragmentTransaction.addToBackStack(null);                    fragmentTransaction.commit();                    break;                case R.id.relEvents:                    fragmentTransaction = getFragmentManager().beginTransaction();                    fragmentTransaction.replace(R.id.containerFucntionsList, new Fragment2());                    fragmentTransaction.addToBackStack(null);                    fragmentTransaction.commit();                    break;            }