ViewPager data not loading on initial app load

Question

i am working on a app which i created using android studio Tabbed Activity i choose this activity so that when user swipe it load some data from a json url

Answer 1

You have to make network call first and once you receive response refresh the Viewpager or set Adapter.

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //Add below two lines in on create
        fetchData process = new fetchData();
        process.execute();

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);

}

And on Post execute of async task, set adapter or refresh page

@Override
protected void onPostExecute(Void aVoid) {
    super.onPostExecute(aVoid);

    MainActivity.mViewPager.setAdapter(mSectionsPagerAdapter);

    MainActivity.factImg.setVisibility(View.VISIBLE);
    MainActivity.factTitle.setText(this.factTitle);
    MainActivity.factDesc.setText(this.factDesc);
    Picasso.get().load(factImg).placeholder(R.drawable.defaultthumb).into(MainActivity.factImg);
    MainA