Dynamically changing the fragments inside a fragment tab host?

Basic concept- We can achieve this by creating a container. Each tab will be assigned with a specific container. Now when we need a new fragment then we will replace same using this container.

Kindly follow undermentioned code step by step to have better understanding. Step-1: Create Tabs for your app. Say "Home.java". It will contain code for creating tabs using fragment.

    import android.os.Bundle;
    import android.support.v4.app.FragmentActivity;
    import android.support.v4.app.FragmentTabHost;
    import android.widget.TextView;
    import app.drugs.talksooner.container.GoContainerFragment;
    import app.drugs.talksooner.container.LearnContainerFragment;
    import app.drugs.talksooner.container.MoreContainerFragment;
    import app.drugs.talksooner.container.TalkContainerFragment;
    import app.drugs.talksooner.container.WatchContainerFragment;
    import app.drugs.talksooner.utils.BaseContainerFragment;

    public class Home extends FragmentActivity {

        private static final String TAB_1_TAG = "tab_1";
        private static final String TAB_2_TAG = "tab_2";
        private static final String TAB_3_TAG = "tab_3";
        private static final String TAB_4_TAG = "tab_4";
        private static final String TAB_5_TAG = "tab_5";
        private FragmentTabHost mTabHost;

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

        private void initView() {
            mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
            mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);

           // mTabHost.addTab(mTabHost.newTabSpec(TAB_1_TAG).setIndicator("Talk", getResources().getDrawable(R.drawable.ic_launcher)), TalkContainerFragment.class, null);
            mTabHost.addTab(mTabHost.newTabSpec(TAB_1_TAG).setIndicator("Talk"), TalkContainerFragment.class, null);
            mTabHost.addTab(mTabHost.newTabSpec(TAB_2_TAG).setIndicator("Learn"), LearnContainerFragment.class, null);
            mTabHost.addTab(mTabHost.newTabSpec(TAB_3_TAG).setIndicator("Go"), GoContainerFragment.class, null);
            mTabHost.addTab(mTabHost.newTabSpec(TAB_4_TAG).setIndicator("Watch"), WatchContainerFragment.class, null);
            mTabHost.addTab(mTabHost.newTabSpec(TAB_5_TAG).setIndicator("More"), MoreContainerFragment.class, null);

            /* Increase tab height programatically 
             * tabs.getTabWidget().getChildAt(1).getLayoutParams().height = 150; 
             */

            for (int i = 0; i < mTabHost.getTabWidget().getChildCount(); i++) {
                final TextView tv = (TextView) mTabHost.getTabWidget().getChildAt(i).findViewById(android.R.id.title);
                if (tv == null)
                continue;
                else
                tv.setTextSize(10);

            }

        }

        @Override
        public void onBackPressed() {
            boolean isPopFragment = false;
            String currentTabTag = mTabHost.getCurrentTabTag();
            if (currentTabTag.equals(TAB_1_TAG)) {
                isPopFragment = ((BaseContainerFragment)getSupportFragmentManager().findFragmentByTag(TAB_1_TAG)).popFragment();
            } else if (currentTabTag.equals(TAB_2_TAG)) {
                isPopFragment = ((BaseContainerFragment)getSupportFragmentManager().findFragmentByTag(TAB_2_TAG)).popFragment();
            } else if (currentTabTag.equals(TAB_3_TAG)) {
                isPopFragment = ((BaseContainerFragment)getSupportFragmentManager().findFragmentByTag(TAB_3_TAG)).popFragment();
            } else if (currentTabTag.equals(TAB_4_TAG)) {
                isPopFragment = ((BaseContainerFragment)getSupportFragmentManager().findFragmentByTag(TAB_4_TAG)).popFragment();
            } else if (currentTabTag.equals(TAB_5_TAG)) {
                isPopFragment = ((BaseContainerFragment)getSupportFragmentManager().findFragmentByTag(TAB_5_TAG)).popFragment();
            }
            if (!isPopFragment) {
                finish();
            }
        }


    }

Your home.xml file

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

         <FrameLayout
            android:id="@+id/realtabcontent"
            android:layout_width="match_parent"
            android:layout_height="0dip"
            android:layout_weight="1" />


        <android.support.v4.app.FragmentTabHost
            android:id="@android:id/tabhost"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            >

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="0dip"
                android:layout_height="0dip"
                android:layout_weight="0" />

        </android.support.v4.app.FragmentTabHost>

    </LinearLayout>

Step-2: Define Base container fragment which will be helpful for backtracking and replacment of fragments "check out replaceFragement() ". Our class "BaseContainerFragment.java"

    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentTransaction;
    import android.util.Log;
    import app.drugs.talksooner.R;

    public class BaseContainerFragment extends Fragment {

        public void replaceFragment(Fragment fragment, boolean addToBackStack) {
            FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
            if (addToBackStack) {
                transaction.addToBackStack(null);
            }
            transaction.replace(R.id.container_framelayout, fragment);
            transaction.commit();
            getChildFragmentManager().executePendingTransactions();
        }

        public boolean popFragment() {
            Log.e("test", "pop fragment: " + getChildFragmentManager().getBackStackEntryCount());
            boolean isPop = false;
            if (getChildFragmentManager().getBackStackEntryCount() > 0) {
                isPop = true;
                getChildFragmentManager().popBackStack();
            }
            return isPop;
        }

    }

Step3: Now here I am considering for one fragment only hoping that rest can be handled by you in same fashion. Defining container Fragment class. Each tab will have specific container. Say TalkContainerFragment.java for first tab

    import android.os.Bundle;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import app.drugs.talksooner.R;
    import app.drugs.talksooner.Talk;
    import app.drugs.talksooner.utils.BaseContainerFragment;

    public class TalkContainerFragment extends BaseContainerFragment {

        private boolean mIsViewInited;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            Log.e("test", "tab 1 oncreateview");
            return inflater.inflate(R.layout.container_fragment, null);
        }

        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            Log.e("test", "tab 1 container on activity created");
            if (!mIsViewInited) {
                mIsViewInited = true;
                initView();
            }
        }

        private void initView() {
            Log.e("test", "tab 1 init view");
            replaceFragment(new Talk(), false);
        }

    }

It's xml file. "container_fragment.xml" this xml container contains frameLayout. we will use this id to replace different Fragments.

    <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/container_framelayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">


    </FrameLayout>

Your main class. "Talk.java"

    public class Talk extends Fragment {

        /** Define global variables over here */
        //private ProgressDialog pDialog;
        StaticApiList sal;
        TalkModelAll tma;
        JSONObject myJasonObject = null;
        private ListView lv;
        private ArrayList<TalkModelAll> m_ArrayList = null;
        //ArrayList<String> stringArrayList = new ArrayList<String>();
        TalkArrayAdapter taa;
        Set<String> uniqueValues = new HashSet<String>();
        TextView rowTextView = null;
        boolean vivek = false;

        int postid;
        String title;
        String thumsrc;
        String largeimg;
        String excert;
        String description;
        String cat;
        String myUrl;
        String jsonString;
        int mCurCheckPosition;
        String check_state = null;
        String ccc;
        LinearLayout myLinearLayout;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.talk, container, false);

            Button btn = (Button) rootView.findViewById(R.id.your_btn_id);
            btn.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
//Here TalkDetail is name of class that needs to open
                    TalkDetail fragment = new TalkDetail();
                    // if U need to pass some data 
                    Bundle bundle = new Bundle();

                    bundle.putString("title", m_ArrayList.get(arg2).title);
                    bundle.putString("largeimg", m_ArrayList.get(arg2).largeimg);
                    bundle.putString("excert", m_ArrayList.get(arg2).excert);
                    bundle.putString("description", m_ArrayList.get(arg2).description);
                    bundle.putString("cat", m_ArrayList.get(arg2).cat);
                    //bundle.putInt("postid", m_ArrayList.get(arg2).postid);

                    fragment.setArguments(bundle);
                    ((BaseContainerFragment)getParentFragment()).replaceFragment(fragment, true);
                }
            });

            return rootView;
        }
    }

That's it. You are good to go. The whole magic lies in calling R.id. instead of R.layout. Cheers!

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