Android create proper Fragment for TabFragmentAdapter; Fragment Communication

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Java

Android

communication

Hi!

I am trying to do following:

MainActivitiy(starts)-->TabFragment[FragmentPagerAdapter](starts) -->StyleFragment[has 4 Image Buttons to start 4 different Fragments]-->(regarding which is clicked) a proper Fragment should be shown in the next tab.


MainActivity
|
|
TabFragment
|
|
|_ _Tab(Style)
| |_ _ _ Style_Fragment(4 Buttons; Classic, Triple, Quadrupel,Multiple)
|
|
|
|_ _ _ Tab(Bild(Picture))
| |_ _ _ Classic
| |
| |_ _ _ Triple
| |
| |_ _ _ Quadrupel
| |
| |_ _ _ Multiple
|
|_ _ _ Tab C
| |_ _ _ Fragment 7
| |
| |_ _ _ Fragment 8
| |
| |_ _ _ Fragment 8
| |

I am able to pass Arguments from "Style_Fragment" to the "MainActivty" and Update the Tab Position, but I am not able to set the proper Fragment into that tab. I tried different approaches but I could never pass an Argument from Activity to TabFragment (paramter: "style_n") If i hardcoded the paramter "public static style_n = 1"(for style_classic) it shows the proper Fragment in the proper tab-Position. I can change style_n=2(for style_triple) and so on and that works. I tried it with bundles, Parameters for the TabFragment, Bundle, global Arguments for the whole application, a Special data storing class...nothing works. I think it has somehow to do with the Fragment LifeCycle.

Please see following Code:

MainActivity:

import java.nio.BufferUnderflowException;

public class MainActivity extends AppCompatActivity implements fragments_communicate {
    DrawerLayout mDrawerLayout;
    NavigationView mNavigationView;
    FragmentManager mFragmentManager;
    FragmentTransaction mFragmentTransaction;



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


        /**
         *Setup the DrawerLayout and NavigationView
         */

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
        mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;

        /**
         * Lets inflate the very first fragment
         * Here , we are inflating the TabFragment as the first Fragment
         */

        mFragmentManager = getSupportFragmentManager();
        mFragmentTransaction = mFragmentManager.beginTransaction();
        mFragmentTransaction.replace(R.id.containerView, new TabFragment()).addToBackStack(null).commit();


        /**
         * Setup click events on the Navigation View Items.
         */

        mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem menuItem) {
                mDrawerLayout.closeDrawers();


                switch (menuItem.getItemId()) {
                    case R.id.nav_item_sent:
                        FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                        fragmentTransaction.replace(R.id.containerView, new OneFragment()).addToBackStack(null).commit();
                        break;
                    case R.id.nav_item_inbox:
                        FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
                        xfragmentTransaction.replace(R.id.containerView, new OneFragment()).addToBackStack(null).commit();
                        break;

                    default:
                        break;
                }


                return false;
            }

        });

        /**
         * Setup Drawer Toggle of the Toolbar
         */

        android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar);
        toolbar.setLogo(R.mipmap.ic_launcher);
        ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, toolbar,R.string.app_name,
                R.string.app_name);

        mDrawerLayout.setDrawerListener(mDrawerToggle);

        mDrawerToggle.syncState();

    }


    public void updateTab(int tab_number, int style_number)
    {
        TabFragment tfrag = new TabFragment();
        tfrag.update_viewPager(tab_number);
        //to be implemented for style_number (I removed that for your ideas)
    }



}

TabFragment:

public class TabFragment extends Fragment  {

    public static TabLayout tabLayout;
    public static ViewPager viewPager;
    public static int int_items = 4 ;
    public static int style_n =1; 
//if I hardcode that I get the correct results
//but I want to Change that value with help of the Main Activity but nothing works

    public TabFragment()
    {

    }

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

        /**
         *Inflate tab_layout and setup Views.
         */
        View x =  inflater.inflate(R.layout.tab_layout,null);
        tabLayout = (TabLayout) x.findViewById(R.id.tabs);
        viewPager = (ViewPager) x.findViewById(R.id.viewpager);
        /**

         *Set an Apater for the View Pager
         */
        viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
        /**
         * Now , this is a workaround ,
         * The setupWithViewPager dose't works without the runnable .
         * Maybe a Support Library Bug .
         */
        tabLayout.post(new Runnable() {
            @Override
            public void run() {
                tabLayout.setupWithViewPager(viewPager);
            }
        });

        return x;

    }


    public class MyAdapter extends FragmentPagerAdapter{


        public MyAdapter(FragmentManager fm) {
            super(fm);
        }
        /**
         * Return fragment with respect to Position .
         */

        @Override
        public Fragment getItem(int position)
        {

            switch (position){

                case 0 : return new StyleFragment();

                case 1 :

                    if (style_n == 1) {

                        return new StyleClassicFragment();
                    }
                    else if (style_n == 2)
                    {
                        return new StyleTripleFragment();
                    }
                    else if (style_n == 3)
                    {
                        return new StyleQuadrupelFragment();

                    }
                    else if (style_n == 4)
                    {
                        return new StyleMultipleFragment();

                    }

                case 2: return new OneFragment();

                case 3: return new PictureFragment();


            }
            return null;
        }

        @Override
        public int getCount() {

            return int_items;

        }

        /**
         * This method returns the title of the tab according to the position.
         */

        @Override
        public CharSequence getPageTitle(int position) {

            switch (position){
                case 0 :
                    return "Style";
                case 1 :
                    return "Bild";
                case 2  :
                    return "One";
                case 3  :
                    return "Picture";

            }
            return null;
        }

    }

    public void update_viewPager(int tab_number)
    {
        viewPager.setCurrentItem(tab_number);
    }

}

Style_Fragment:

package com.sub_zero.ipostcard.fragments.tabs.Style;

/**
 * Created by Sub-Zero on 10.01.2016.
 */

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;

import com.sub_zero.ipostcard.R;
import com.sub_zero.ipostcard.interf.fragments_communicate;

public class StyleFragment extends Fragment implements View.OnClickListener {

    View rootView;
    fragments_communicate fc;


    ImageButton imageButton_classic, imageButton_triple, imageButton_quadrupel, imageButton_multiple ;

    public StyleFragment() {
        // Required empty public constructor
    }

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.fragment_style, container, false);
        imageButton_classic = (ImageButton) rootView.findViewById(R.id.imageButton_style_classic);
        imageButton_classic.setOnClickListener(this);
        imageButton_triple = (ImageButton) rootView.findViewById(R.id.imageButton_style_triple);
        imageButton_triple.setOnClickListener(this);
        imageButton_quadrupel = (ImageButton) rootView.findViewById(R.id.imageButton_style_quadrupel);
        imageButton_quadrupel.setOnClickListener(this);
        imageButton_multiple = (ImageButton) rootView.findViewById(R.id.imageButton_style_multiple);
        imageButton_multiple.setOnClickListener(this);
        fc = (fragments_communicate) getActivity();
        // Inflate the layout for this fragment
        return rootView;
    }

    @Override
    public void onClick(View v) {
        //do what you want to do when button is clicked
        switch (v.getId()) {
            case R.id.imageButton_style_classic:
                //1st Argument:return fragment at TabPosition 1(Bild)
                //2nd argument: regarding which style return: 1=Classic, 2=triple, 3=quadrupel, 4=multiple Fragment
                fc.updateTab(1, 1);
                break;
            case R.id.imageButton_style_triple:
                //return triple_fragment at TabPosition 1(Bild)
                fc.updateTab(1, 2);
                break;
            case R.id.imageButton_style_quadrupel:
                //return quadrupel fragment at TabPosition 1(Bild)
                fc.updateTab(1, 3);
                break;
            case R.id.imageButton_style_multiple:
                //return multiple fragment at TabPosition 1(Bild)
                fc.updateTab(1, 4);
        }
    }


    @Override
    public void onAttach(Activity activity)
    {
        super.onAttach(activity);
    }

    @Override
    public void onDetach()
    {
        super.onDetach();
    }



}

Interface (Fragment_communicate):

public interface fragments_communicate{
    public void updateTab(int tab_number, int style_number);
}