Update a TextView in a ViewPager from another Fragment

Question

I am trying to update a TextView in a Fragment clicking on a button on another Fragment.

Actually I implemented the callback function to the Activity and it does wor

Answer 1

SOLVED!

Overriding instantiateItem() in TabsAdapter and adding the ViewPager as ContainerViewID in the FragmentTransaction made it!

Here's the functioning whole FragmentActivity!

import java.util.ArrayList;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentManager.OnBackStackChangedListener;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.ActionBar.Tab;
import android.support.v4.app.SupportActivity;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.TextView;

/**
 * Demonstrates combining the action bar with a ViewPager to implement a tab UI
 * that switches between tabs and also allows the user to perform horizontal
 * flicks to move between the tabs.
 */
public class ActionBarTabsPager extends FragmentActivity implements SecondFragment.OnButtonClickedXListener{
    ViewPager  mViewPager;
    TabsAdapter mTabsAdapter;
    FragmentManager fm;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Log.i("ONCREATE START","ONCREATE START");


        setContentView(R.layout.actionbar_tabs_pager);


        if (savedInstanceState == null) {


            Fragment newFragment = new FirstFragment();
            Fragment newFragment2 = new SecondFragment();

            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            ft.add(R.id.pager, newFragment, "FirstFragment");
            ft.add(R.id.pager, newFragment2, "SecondFragment");
            ft.commit();


       }

        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab tab1 = getSupportActionBar().newTab().setText("Fragment 1");
        ActionBar.Tab tab2 = getSupportActionBar().newTab().setText("Fragment 2");
        //ActionBar.Tab tab3 = getSupportActionBar().newTab().setText("Fragment 1");
        //ActionBar.Tab tab4 = getSupportActionBar().newTab().setText("Fragment 2");

        mViewPager = (ViewPager)findViewById(R.id.pager);
        mTabsAdapter = new TabsAdapter(this, getSupportActionBar(), mViewPager);

            mTabsAdapter.addTab(tab1, FirstFragment.class);
            mTabsAdapter.addTab(tab2, SecondFragment.class);//LoaderCursorSupport.CursorLoaderListFragment.class);
            //mTabsAdapter.addTab(tab3, FirstFragment.class);//LoaderCustomSupport.AppListFragment.class);
            //mTabsAdapter.addTab(tab4, SecondFragment.class);//LoaderThrottleSupport.ThrottledLoaderListFragment.class);



        if (savedInstanceState != null) {
            getSupportActionBar().setSelectedNavigationItem(savedInstanceState.getInt("index"));
        }

        Log.i("ONCREATE END","ONCREATE END");

    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        Log.i("onSaveInstanceState START","onSaveInstanceState START");
        super.onSaveInstanceState(outState);
        outState.putInt("index", getSupportActionBar().getSelectedNavigationIndex());
        Log.i("onSaveInstanceState END","onSaveInstanceState END");

    }

    /**
     * This is a helper class that implements the management of tabs and all
     * details of connecting a ViewPager with associated TabHost.  It relies on a
     * trick.  Normally a tab host has a simple API for supplying a View or
     * Intent that each tab will show.  This is not sufficient for switching
     * between pages.  So instead we make the content part of the tab host
     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
     * view to show as the tab content.  It listens to changes in tabs, and takes
     * care of switch to the correct paged in the ViewPager whenever the selected
     * tab changes.
     */
    public class TabsAdapter extends FragmentPagerAdapter implements ViewPager.OnPageChangeListener, ActionBar.TabListener {
        private final Context mContext;
        private final ActionBar mActionBar;
        private final ViewPager mViewPager;
        private final ArrayList mTabs = new ArrayList();
        private FragmentTransaction mCurTransaction = null;


        public TabsAdapter(FragmentActivity activity, ActionBar actionBar, ViewPager pager) {
            super(activity.getSupportFragmentManager());
            mContext = activity;
            mActionBar = actionBar;
            mViewPager = pager;
            mViewPager.setAdapter(this);
            mViewPager.setOnPageChangeListener(this);


        }

        public void addTab(ActionBar.Tab tab, Class clss) {
            Log.i("addTab","addTab");

            mTabs.add(clss.getName());
            mActionBar.addTab(tab.setTabListener(this));
            notifyDataSetChanged();
        }

        @Override
        public int getCount() {
            return mTabs.size();
        }

        @Override
        public Object instantiateItem(View container, int position) {
            if (mCurTransaction == null) {
                mCurTransaction = getSupportFragmentManager().beginTransaction();
            }
            // TODO Auto-generated method stub
            Fragment fragment = getItem(position);

            if (fragment!=null){
                Log.i("Fragment Found!","Fragment Found! "+fragment.getTag());
                mCurTransaction.attach(fragment);
                }


            return fragment;//super.instantiateItem(container, position);
        }

        @Override
        public Fragment getItem(int position) {
            Log.i("getItem","getItem");

            if (position==0)
                {Log.i("position=0","position=0");
                return getSupportFragmentManager().findFragmentByTag("FirstFragment");}

            else if (position==1)
            {Log.i("position=1","position=1");
                return getSupportFragmentManager().findFragmentByTag("SecondFragment");}

            else return null;//Fragment.instantiate(mContext, mTabs.get(position), null);

        }


        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }

        @Override
        public void onPageSelected(int position) {
            mActionBar.setSelectedNavigationItem(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {
        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            mViewPager.setCurrentItem(tab.getPosition());

        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        }


    }

    @Override
    public void OnButtonClickedX(View v) {

        if (v==findViewById(R.id.button1)){
            Log.i("TRIGGERED","TRIGGERED");

            FirstFragment ff = (FirstFragment) getSupportFragmentManager().findFragmentByTag("FirstFragment");

            View root = ff.getView();
            TextView tv = (TextView) root.findViewById(R.id.textView1);
            Log.i("Text before Edit",""+tv.getText());
                  tv.setText("MODIFIED");
                  Log.i("Text after Edit",""+tv.getText());




        }
        // TODO Auto-generated method stub

    }





}

Thanks to vbsteven!