[android-developers] Re: Removing a Fragment from FragmentPagerAdapter

Sorry its actually the Navigation Type: Swipe Views + Title Strip type

On Saturday, November 2, 2013 5:45:08 PM UTC+2, Boozel wrote:

Hi

I have created an Activity from the template of a Blank Activity (http://developer.android.com/tools/projects/templates.html#blank-activity) with Navigation Type: Tabs or Tabs + Swipe

My code is below. I cannot find a way to remove a fragment. I can delete a tab from the pager at the Top but the fragment below is not removed. Please can you tell me what I am doing wrong? Any help would be appreciated.

Thanks in advance.

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentPagerAdapter;

import android.support.v4.view.ViewPager;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends FragmentActivity {

    private static final String TAG = "Tag";

    SectionsPagerAdapter mSectionsPagerAdapter;

    Context context;

    ArrayList<String> titles;

    ArrayList<Fragment> frags;

    /**

     * The {@link ViewPager} that will host the section contents.

     */

    ViewPager mViewPager;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        context = getApplicationContext();

        //========================

        titles = new ArrayList<String>();

        frags = new ArrayList<Fragment>();

        titles.add("One");

        titles.add("Two");

        titles.add("Three");

        titles.add("Four");

        createFrags();

        //=========================

        setContentView(R.layout.activity_main);

        // Create the adapter that will return a fragment for each of the three

        // primary sections of the app.

        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

       // Set up the ViewPager with the sections adapter.

        mViewPager = (ViewPager) findViewById(R.id.pager);

        mViewPager.setAdapter(mSectionsPagerAdapter);

    }

    public void createFrags()

    {

        for (int i = 0; i < titles.size(); i++)

        {

        Fragment fragment = genFrag(i+"");

         frags.add(fragment);

        }

    }

    public Fragment genFrag(String i)

    {

        Fragment fragment = new DummySectionFragment();

        Bundle args = new Bundle();

        args.putString(DummySectionFragment.ARG_SECTION_NUMBER, i);

        fragment.setArguments(args);

        return fragment;

    }

    @Override

    public void onDestroy()

    {

        super.onDestroy();

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        Log.d(TAG,"onOptionsItemSelected");

        // Handle item selection

        switch (item.getItemId()) {

            case R.id.action_settings:

                Log.d(TAG,"Settings menu item pressed");

                Toast.makeText(this,"Settings",Toast.LENGTH_LONG);

                Intent i = new Intent(getApplicationContext(), SettingsActivity.class);

                startActivity(i);

                return true;

            case R.id.action_sendmsg:

                Log.d(TAG,"Send Message Option Pressed");

                // Start the service, keeping the device awake while it is launching.

                Intent intent =  new Intent(this, SendMsgIntentService.class);

                startService(intent);

                Log.d(TAG,"Service Should be started?");

                return true;

            case R.id.action_add:

                Log.d(TAG,"Add menu item pressed");

                addTab("New");

                return true;

            case R.id.action_delete:

                Log.d(TAG,"delete menu item pressed");

                int a = mViewPager.getCurrentItem();

                removeTab(a);

                return true;

            default:

                return super.onOptionsItemSelected(item);

        }

    }

    public void addTab(String name)

    {

        Log.i(TAG,"Add Tab");

        titles.add("New");

        Fragment f = genFrag(name);

        frags.add(f);

        mSectionsPagerAdapter.notifyDataSetChanged();

        /*

        int position = mSectionsPagerAdapter.getCount()+1;

        Fragment fragment = new DummySectionFragment();

        Bundle args = new Bundle();

        args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position);

        fragment.setArguments(args);

        mSectionsPagerAdapter.instantiateItem(mViewPager, position);

        mSectionsPagerAdapter.notifyAll();

        */

    }

    public void removeTab(int position)

    {

        Log.i(TAG,"Remove Tab");

        if(titles.size()==1)

        {

            Toast.makeText(context, "You need to have at least one page.",Toast.LENGTH_LONG).show();

        }else{

        titles.remove(position);

        frags.remove(position);

        mSectionsPagerAdapter.notifyDataSetChanged();

        }

     /*

        mSectionsPagerAdapter.destroyItem(mViewPager, position, mSectionsPagerAdapter.getItem(position));

        mSectionsPagerAdapter.notifyDataSetChanged();

     */

    }

    /**

     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to

     * one of the sections/tabs/pages.

     */

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {

            super(fm);

        }

        @Override

        public Fragment getItem(int position) {

            // getItem is called to instantiate the fragment for the given page.

            // Return a DummySectionFragment (defined as a static inner class

            // below) with the page number as its lone argument.

            return frags.get(position);

        }

        @Override

        public int getCount() {

            // Show 3 total pages.

            return frags.size();

        }

        @Override

        public CharSequence getPageTitle(int position) {

            return titles.get(position);

        }

    }

    /**

     * A dummy fragment representing a section of the app, but that simply

     * displays dummy text.

     */

    public static class DummySectionFragment extends Fragment {

        /**

         * The fragment argument representing the section number for this

         * fragment.

         */

        public static final String ARG_SECTION_NUMBER = "section_number";

        public DummySectionFragment() {

        }

        @Override

        public View onCreateView(LayoutInflater inflater, ViewGroup container,

                Bundle savedInstanceState) {

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

            TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);

            dummyTextView.setText(getArguments().getString(ARG_SECTION_NUMBER));

            return rootView;

        }

    }

}

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