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//Add fragment

 FragmentManager fragmentManager = getSupportFragmentManager();
        Fragment fragment = fragmentManager.findFragmentById(R.id.fragment_container);

        if (fragment == null){
            fragment = new MainFragment();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.add(R.id.fragment_container,fragment);
            fragmentTransaction.commit();


//Replace fragment

        PickPowerFragment pickPowerFragment = new PickPowerFragment();
        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,pickPowerFragment).addToBackStack(null).commit();