CODEWITHSUNDEEP
androidandroid-fragmentsandroid-activitymethodstabs
Khashayar
Khashayar

Reputation: 356

Call function in fragment from MainActivity

Edit
fragment A with function A1
fragment B with function B1
Two tabs in main activity
tabA got fragment A
tabB got fragment B
my problem is : call function A1 from main activity 

 //here i create taps and fragment into viewpaper

 private void setupViewPager(ViewPager viewPager){
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new OneFragment(),"ONE");
    adapter.addFragment(new TwoFragment(),"TWO");
    viewPager.setAdapter(adapter);
}



 class ViewPagerAdapter extends FragmentPagerAdapter{
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();
        @Nullable
        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }

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

@Override
public Fragment getItem(int position) {
    return mFragmentList.get(position);
}

@Override
public int getCount() {
    return mFragmentList.size();
}
public void addFragment(Fragment fragment,String tittle){
    mFragmentList.add(fragment);
    mFragmentTitleList.add(tittle);
}
 }

Upvotes: 1

Views: 79

Answers (2)

prashant17
prashant17

Reputation: 1550

You can use broadcastreceiver

In fragment A

public static final String BROADCAST_ACTION = "BROADCAST_ACTION";

BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction() != null &&
                intent.getAction().equals(BROADCAST_ACTION)) {
                //Call your function A
        }
    }
};

@Override
public void onResume() {
    super.onResume();
    LocalBroadcastManager.getInstance(
            context).registerReceiver(broadcastReceiver, new IntentFilter(BROADCAST_ACTION));
}

@Override
public void onStop() {
    super.onStop();
    LocalBroadcastManager.getInstance(context).unregisterReceiver(broadcastReceiver);
}

In your activity where you want to call fragment method call send broadcast:

Intent intent = new Intent(FragmentA.BROADCAST_ACTION);
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent);

Upvotes: 1

Tyler V
Tyler V

Reputation: 10940

Based on the code you posted, you could just save an instance of the fragment directly in your Activity like this

private OneFragment f1;
private TwoFragment f2;

private void setupViewPager(ViewPager viewPager){
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    f1 = new OneFragment();
    f2 = new TwoFragment();
    adapter.addFragment(f1,"ONE");
    adapter.addFragment(f2,"TWO");
    viewPager.setAdapter(adapter);
}

then anywhere in your activity you want to use them just call

f1.myMethod();
f2.myMethod();

You could also just save your adapter and use it to access the Fragments, as in

private ViewPagerAdapter adapter;

private void setupViewPager(ViewPager viewPager){
    adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new OneFragment(),"ONE");
    adapter.addFragment(new TwoFragment(),"TWO");
    viewPager.setAdapter(adapter);
}

and to access them in the Activity call

OneFragment f1 = (OneFragment)adapter.getItem(0);
TwoFragment f2 = (TwoFragment)adapter.getItem(1);

Upvotes: 2

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