CODEWITHSUNDEEP
android
androidnewbie
androidnewbie

Reputation: 374

Android ViewPager refresh when swipe

My fragment is not refreshing when I swipe back, so I want to know how I can refresh it when I swipe it back. I have seen many different answers online, but I don't why they don't work in my situation. It would be highly appreciated if someone could help me out, thanks.

public class MainActivity extends AppCompatActivity {

private SectionsPagerAdapter mSectionsPagerAdapter;

private ViewPager mViewPager;

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

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    // Create the adapter that will return a fragment for each of the three
    // primary sections of the activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                Profile tab1 = new Profile();
                return tab1;
            case 1:
                Puzzles tab2 = new Puzzles();
                return tab2;
            default:
                return null;
        }
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return 2;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "Profile";
            case 1:
                return "Puzzles";
        }
        return null;
    }
}
}

I have tried setOffscreenPageLimit(0), detach attach fragment in onTabSelected, using FragmentStatePagerAdapter, notifyDataSetChanged(), and even

public int getItemPosition(Object object) {
return POSITION_NONE;
}

this doesn't work too. So I hope someone could help.

Upvotes: 0

Views: 1034

Answers (2)

Tahmid Rahman
Tahmid Rahman

Reputation: 758

If you want to refresh the data in a particular Fragment, you have to do 2 things,

  1. Store the updated data into Activity
  2. Show the updated data in onResume() in that particular Fragment

If you want your data to be saved even after killing the app, store it in SharedPreference. Hope it helps!

Upvotes: 2

Niraj Niroula
Niraj Niroula

Reputation: 2424

On your fragment class add this.

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

     //Try adapter.notifyDataSetChanged or something like passing the new(updated) data to adapter from here.        

    }
}

Hope it helps.

Upvotes: 0

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