[Solved] OnClick button replacing fragment many times with FragmentTransaction, ignoring Tag

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This line of code is misplaced:

Fragment fragment = fm.findFragmentByTag(MAIN);

You have it outside of the onClick() method, which means that the value of fragment is determined once (when you create/assign the OnClickListener) and then reused every time the button is clicked.

Just move that line inside the onClick() method:

    @Override
    public void onClick(View view) {
        Fragment fragment = fm.findFragmentByTag(MAIN);
        if(fragment == null) {
            FragmentTransaction transaction = fm.beginTransaction();
            transaction.replace(R.id.content, new MainFragment(), MAIN).addToBackStack(null).commit();
        }else{
            Toast.makeText(getApplicationContext(), "Fragment already created", Toast.LENGTH_SHORT).show();
            Log.i("onCreate():","Fragment Already created");
        }
    }

solved OnClick button replacing fragment many times with FragmentTransaction, ignoring Tag