how can i solve android tab layout switching

Question

i am developing an android app which has four fragments with tablayout and each fragment has connection error dialog box.

first problem is,when i start my app,four fragments work simultaneously at the same time.So,when i occur connection error four dialog boxes are shown in first fragment When i switch to second tab it doesn't show his dialog box because his dialog is shown in first fragment.
second problem is,i create that fragments with swipe refresh layout to fetch data from server.I call onRefresh method in onCreate method. when i start my app,first fragment data is loaded from server but when i switch first tab to second tab,it is not loaded his data from server but when i switch first tab to third tab,it is work. Also,when i switch second tab to third tab,it is not loaded data from server but when i switch second tab to fourth tab,it is work. It is only work when i switch tabs with one tab differ. Is there anyway to solve that problems.

I searched this problems from internet but i didn't get my problems answer. Please anyone help me.Thanks in advance..... Sorry for my poor english

this is tablyout code

        viewPager = (ViewPager) findViewById(R.id.viewpagerMain);
        tabLayout = (TabLayout) findViewById(R.id.tablayoutMain);
        tabLayout.addTab(tabLayout.newTab().setText("Noticeboard"));
        tabLayout.addTab(tabLayout.newTab().setText("News"));
        tabLayout.addTab(tabLayout.newTab().setText("Events"));
        tabLayout.addTab(tabLayout.newTab().setText("Result"));
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
        viewPager.setAdapter(new MyAdapter(getSupportFragmentManager(), tabLayout.getTabCount()));
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        viewPager.setOffscreenPageLimit(0);
        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

This is MyAdapter class

class MyAdapter extends FragmentStatePagerAdapter {
        int num_of_tab;

        public MyAdapter(FragmentManager fm, int num_of_tab) {
            super(fm);
            this.num_of_tab = num_of_tab;
        }

        @Override
        public Fragment getItem(int position) {
            switch (position) {
                case 0:
                    NoticeBoardFragment noticeBoardFragment = new NoticeBoardFragment();
                    return noticeBoardFragment;
                case 1:
                    NewsFragment newsFragment = new NewsFragment();
                    return newsFragment;
                case 2:
                    EventsFragment eventsFragment = new EventsFragment();
                    return eventsFragment;
                case 3:
                    ResultFragment resultFragment = new ResultFragment();
                    return resultFragment;
                default:
                    return null;
            }
        }

        @Override
        public int getCount() {
            return num_of_tab;
        }

    }

First Problem: you need to check the connection error in Onresume() method instead of oncreate(). — Arun Inbasekaran, Jun 14 '17 at 06:43
Visit https://stackoverflow.com/questions/30796710/tablayout-tab-selection Solve your quesion by this link — Sanjay Hadiya, Jun 14 '17 at 07:07

score 0 · Answer 1 · answered Jun 14 '17 at 06:48

0

Override setUserVisibleHint in each fragment and write your dialog box code in if(isVisibleToUser) instead of Oncreate. This should solve your problem

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);




    if(isVisibleToUser) {

     //dialog box code here 


     }

}

answered Jun 14 '17 at 06:48

Jani

77
2
14

but my dialog box is created in another class.How can i call it. – MD Shafee Jun 14 '17 at 06:57
i shared as an answer – MD Shafee Jun 14 '17 at 07:10
Write this method in FragmentActivity. public Fragment getFragment(int position){ Fragment fragment = (Fragment) viewPager.getAdapter().instantiateItem(viewPager,position); if (fragment instanceof NoticeBoardFragment){NoticeBoardFragment object = (NoticeBoardFragment) fragment; return object; }else if(fragment instanceof EventsFragment){ EventsFragment object = (EventsFragment) fragment; return object; .. Pass an unique int FRAGMENTAG along with the network call and call the Dailogalert from each fragment – Jani Jun 14 '17 at 07:22

how can i solve android tab layout switching

1 Answers1