Getting data from MainActivity and handling it in Fragment

Question

I have a problem while getting data from MainActivity and handle it on Fragment.

At first, there are 4 Fragments. I am using TabLayout and ViewPager. Whenever a fragment selected from the Tab, it triggers onPageSelected() method. Here, I instantiate transaction and send the string URL according to selected Fragment by the means of setArguments(). In the Fragment I receive string URL with the help of getArguments() successfully, however when I retrieve data from API using that URL, fetchData()(using Volley) method ignores it.

Below is onPageSelected() method

@Override
            public void onPageSelected(int position) {
                switch (position) {
                    case 0:
                        getSupportFragmentManager().beginTransaction().replace(
                                R.id.linear_frame,
                                FragmentAllLanguages.newInstance(0, NetworkUtils.URL_ALL_NEWS))
                                .commit();
                        break;

onCreateView() of Fragment

        if (getArguments() != null) {
        fetchData(getArguments().getString(ARGS_URL));
        Toast.makeText(getContext(), "URL is " + getArguments().getString(ARGS_URL), Toast.LENGTH_SHORT).show();
        Log.e(TAG, "IF IF IF" + getArguments().getInt(ARGS_ID));
    } else {
        fetchData(NetworkUtils.URL_ALL_NEWS);
        Toast.makeText(getContext(), "else part", Toast.LENGTH_SHORT).show();
        Log.e(TAG, "ELSE ELSE ELSE");
    }

Finally, "interesting" log file when fragment selected

04-18 02:43:20.764 5610-5610/com.example.orkhan.nexeber E/Volley: ELSE ELSE ELSE
04-18 02:43:20.768 5610-5610/com.example.orkhan.nexeber E/RecyclerView: No adapter attached; skipping layout
04-18 02:43:20.770 5610-5683/com.example.orkhan.nexeber D/EGL_emulation: eglMakeCurrent: 0x9e105420: ver 2 0 (tinfo 0x9e103370)
04-18 02:43:20.794 5610-5610/com.example.orkhan.nexeber E/Volley: IF IF IF2
04-18 02:43:20.850 5610-5610/com.example.orkhan.nexeber E/RecyclerView: No adapter attached; skipping layout

My question is why if statement called twice though it is chosen once in Tab?

My version is maybe because of beginTransaction's delay, I mean, it cannot send data as fast as oncreateView() method's call. That's why at first else part is executed and then when if part is executed RecyclerView ignores it.

The Answer is on your Logs if you read it carefully. It's probably because you didn't attach any `adapter` to your `RecyclerView` — alizeyn, Apr 18 '18 at 05:09
@AliZeynali No, I already find an answer. Whenever it creates new instance it calls Fragment's onCreatView 2 times: once in newInstance class, the second when transaction happens. — Orkhan Bayramli, Apr 18 '18 at 23:29

Getting data from MainActivity and handling it in Fragment

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