Develop Reference

How to ensure that onCreateView() for a fragment class is called each time I swipe to it's tab?

In my program, I have 2 implemented tabs using fragments. I've placed an EditText inside Tab2. I want to write all my main code for Tab2 inside onCreateView() of fragment Tab2, so that every time I swipe over to Tab2, this same code is executed. To test whether onCreateView() was being called every time I swiped to Tab2, I wrote the following statement in onCreateView() of Tab2:
text.setText("default");
Now when I run the app and swipe to Tab2- I see 'default' written. Now if I change this text manually, then swipe over to Tab1 and come back to Tab2- I still see this same text written. This obviously means that onCreateView() was not called again when I swiped to Tab2 for the 2nd time? How do I fix this?
Tab2.java
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Tab2 extends Fragment
{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
setRetainInstance(false);
final View rootView;
rootView= inflater.inflate(R.layout.fragment_tab2, container, false);
text.setText("default");
return rootView;
}
}
MainActivity.java
package com.example.nirvan.diary30;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v7.widget.Toolbar;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity
{
public static int itemPosition;
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
viewPager.setOffscreenPageLimit(0);
}
private void setupViewPager(ViewPager viewPager)
{
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new Tab1(), "ONE");
adapter.addFragment(new Tab2(), "TWO");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter
{
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}

If you are using ViewPager
ViewPager viewPager;
Try to use setOnPageChangeListenerin MainActivity
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if(mFragmentList.size() > position && mFragmentList.get(position) instanceof Tab2)
{
((Tab2)mFragmentList.get(position)).changeText("changed text")
}
// you can use interface insted
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
in Tab2
public void changeText(String string){
text.setText(string);
}
Update MainActivity.java
public class MainActivity extends AppCompatActivity
{
public static int itemPosition;
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
ViewPagerAdapter adapter;
private final List<Fragment> mFragmentLists = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
viewPager.setOffscreenPageLimit(0);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if(mFragmentList.size() > position && mFragmentList.get(position) instanceof Tab2)
{
((Tab2)mFragmentList.get(position)).changeText("changed text")
}
// you can use interface insted
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
}
private void setupViewPager(ViewPager viewPager)
{
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new Tab1(), "ONE");
adapter.addFragment(new Tab2(), "TWO");
viewPager.setAdapter(adapter);
mFragmentLists = adapter.getFragements();
}
class ViewPagerAdapter extends FragmentPagerAdapter
{
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public List<Fragment> getFragements()
{
return mFragmentList;
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}

Add ViewPager in Fragment in Android

I have two fragments: FirstFragment and SecondFragment. FirstFragment contains ViewPager, which has three pages (three fragments). In the onCreate of activty, I add FirstFragment to main layout, and three pages show normally.
Problem is: when I replace FirstFragment by SecondFragment, and then comeback FirstFragment three pages disappear. Then I scroll ViewPager forward and backward, pages show but only first and third pages show, second page disappear.
Here FirstFragment:
package com.example.bkmsx.afragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FirstFragment extends Fragment {
ViewPager mViewPager;
static MainActivity mainActivity;
public static FirstFragment newInstance(MainActivity activity){
mainActivity = activity;
return new FirstFragment();
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.first_fragment, null);
mViewPager = (ViewPager) view.findViewById(R.id.view_pager);
ViewPagerAdapter adapter = new ViewPagerAdapter(mainActivity.getSupportFragmentManager());
mViewPager.setAdapter(adapter);
return view;
}
private class ViewPagerAdapter extends FragmentPagerAdapter {
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
String text = "";
switch (position) {
case 0: text = "First Page";
break;
case 1: text = "Second Page";
break;
case 2: text = "Third Page";
break;
}
return TextFragment.newInstance(mainActivity, text);
}
#Override
public int getCount() {
return 3;
}
}
}
SecondFragment:
package com.example.bkmsx.afragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class SecondFragment extends Fragment {
static MainActivity mainActivity;
public static SecondFragment newInstance(MainActivity activity) {
mainActivity = activity;
return new SecondFragment();
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
TextView textView = new TextView(mainActivity);
textView.setText("New Fragment");
return textView;
}
}
Any suggestion? Thanks in advance.

In FirstFragment , Use this code and try
public View view; // declare view as global variable
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
if(view == null){
view = inflater.inflate(R.layout.first_fragment, null);
mViewPager = (ViewPager) view.findViewById(R.id.view_pager);
ViewPagerAdapter adapter = new ViewPagerAdapter(mainActivity.getSupportFragmentManager());
mViewPager.setAdapter(adapter);
}
return view;
}
As Divyesh comment has good suggestion there is also need to add
mViewPager.setOffscreenPageLimit(3);

use ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager() ); instead of mainActivity.getSupportFragmentManager()

Try this code Hope it helps
final ViewPager viewPager = (ViewPager) findViewById(R.id.container);
final PagerAdapter adapter = new PaginationAdapter(getSupportFragmentManager(),tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
viewPager.setOffscreenPageLimit(3);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});

Populating Custom ListView in a Fragment

I have two activities, the main activity invokes a navigation drawer and one of the drawer items invokes another activity(event_activity) containing a Swipeable Tabbed layout. Each tab is a fragment invoked by the the event_activity. Now i want to populate custom ListViews to each fragment from a json data.
I tried using THIS tutorial, but its meant to be used with an activity, so got error while doing it with my fragment.
So, is there any way to populate the fragments using custom listviews?
Tabbed layout
This is my event_activity
package com.explore.sargam.activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import com.explore.sargam.R;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import java.util.ArrayList;
import java.util.List;
import com.explore.sargam.OneFragment;
import com.explore.sargam.ThreeFragment;
import com.explore.sargam.TwoFragment;
import com.explore.sargam.FourFragment;
public class ResultActivity extends AppCompatActivity {
private TabLayout tabLayout;
private ViewPager viewPager;
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(false);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new OneFragment(), "Day 1");
adapter.addFragment(new TwoFragment(), "Day 2");
adapter.addFragment(new ThreeFragment(),"Day 3");
adapter.addFragment(new FourFragment(), "Day 4");
viewPager.setAdapter(adapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_result, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
And this is my Fragment code
package com.explore.sargam;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class TwoFragment extends Fragment{
private static final String TAG = TwoFragment.class.getSimpleName();
public TwoFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_two, container, false);
}
}

How to set onclick listener for tabView with listed items and move to a new Activity

Here I created a simple Tablayout with some options under it. When clicked on particular item the application should open another activity containing the particular class. Could Some one please help how to write the code for item onclick listener .Here I am attaching the code of my TabLayout java class and my versionModel java class with xml included. I am also attaching the screenshot of the app. So as in the screenshot when i click on the Topwear , page containing Topwear should open.
TabAnimationActivity.java
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.FrameLayout;
import android.widget.Toast;
import com.suleiman.material.R;
import com.suleiman.material.adapter.SimpleRecyclerAdapter;
import com.suleiman.material.model.VersionModel;
import java.util.ArrayList;
import java.util.List;
public class TabAnimationActivity extends AppCompatActivity {
SimpleRecyclerAdapter adapter;
Intent intent;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab_animation);
final Toolbar toolbar = (Toolbar) findViewById(R.id.tabanim_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
final ViewPager viewPager = (ViewPager) findViewById(R.id.tabanim_viewpager);
setupViewPager(viewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabanim_tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
switch (tab.getPosition()) {
case 0:
showToast("One");
break;
case 1:
showToast("Two");
break;
case 2:
showToast("Three");
break;
}
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
void showToast(String msg) {
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new DummyFragment(getResources().getColor(R.color.accent_material_light)), "Men");
adapter.addFrag(new DummyFragment(getResources().getColor(R.color.ripple_material_light)), "Women");
adapter.addFrag(new DummyFragment(getResources().getColor(R.color.button_material_dark)), "Kids");
viewPager.setAdapter(adapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_tab_switch, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
case R.id.action_switch:
Intent intent = new Intent(TabAnimationActivity.this, TabsHeaderActivity.class);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
static class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
public static class DummyFragment extends Fragment {
int color;
SimpleRecyclerAdapter adapter;
public DummyFragment() {
}
#SuppressLint("ValidFragment")
public DummyFragment(int color) {
this.color = color;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dummy_fragment, container, false);
final FrameLayout frameLayout = (FrameLayout) view.findViewById(R.id.dummyfrag_bg);
frameLayout.setBackgroundColor(color);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.dummyfrag_scrollableview);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setHasFixedSize(true);
List<String> list = new ArrayList<String>();
for (int i = 0; i < VersionModel.data.length; i++) {
list.add(VersionModel.data[i]);
}
adapter = new SimpleRecyclerAdapter(list);
recyclerView.setAdapter(adapter);
return view;
}
}
}
VersionModel.java
public class VersionModel {
public String name;
public static final String[] data = {"Topwear", "Bottomwear", "Footwear",
"Sports wear", "Innerwear &Sleepwear", "SmartWearables",
"Watches", "Accessories", "PersonalGrooming", "T-Shirts"};
VersionModel(String name){
this.name=name;
}
}
dummy_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/dummyfrag_bg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/background_material_light">
<android.support.v7.widget.RecyclerView
android:id="#+id/dummyfrag_scrollableview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>

I hope This may give you an idea on Recyclerview OnItemClick.
RecyclerView recyclerView = (RecyclerView)v.findViewById(R.id.dummyfrag_scrollableview);
LinearLayoutManager llm = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(llm);
recyclerView.setHasFixedSize(true); // to improve performance
recyclerView.setAdapter(new YourRecylerAdapter());
recyclerView.addOnItemTouchListener( new RecyclerClickListener(getContext(), new RecyclerClickListener.OnItemClickListener() {
#Override
public void onItemClick(View view, int position) {
Intent intent = new Intent(getActivity(),
YourDetailedActivity.class);
startActivity(intent);
}}));
return v;

Android: tabs with swipe not showing listfragment

I'm dealing with this tutorial: http://www.lucazanini.eu/2012/android/tabs-and-swipe-views/?lang=en .
The problem is that if I set as layout of the tab a simple static layout, like this (as the tutorial does), everything works fine:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/tab1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/body1" />
</LinearLayout>
But I need the tab to be a ListFragment, and the matter is that my ListFragment shows nothing at all.
Here is the code. Don't desperate: I put lots of code but I think you will probably just need to look at the classes SongsFragment and SongsListAdapter (well, I am not sure because I were it I would not write here, however I suppose it because with a static layout everything works fine!)
EDIT: I post just one listfragment in the exemple, however it seems that every listfragment has the same issue
EDIT: probably the problem is that I need to use a method to show the fragment when the tab is selected
THANKS A LOT
Activity:
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
public class PlayerActivity extends FragmentActivity implements
ActionBar.TabListener {
CollectionPagerAdapter mCollectionPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mCollectionPagerAdapter = new CollectionPagerAdapter(getSupportFragmentManager());
final ActionBar actionBar = getActionBar();
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mCollectionPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// When swiping between different app sections, select
// the corresponding tab.
// We can also use ActionBar.Tab#select() to do this if
// we have a reference to the Tab.
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mCollectionPagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab()
.setText(mCollectionPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
mViewPager.setCurrentItem(tab.getPosition());
}
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// TODO Auto-generated method stub
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
SongsFragment
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
public class SongsFragment extends ListFragment {
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
public class SongsFragment extends ListFragment {
List<String[]> songs;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
songs = SongsDataSource.getInstance().getAllSongs();
List<String[]> values = new ArrayList<String[]>();
if (songs.size() == 0) {
values.add(new String[] { "No files found", "Try to update your database", "" });
}
for (String[] song : songs) {
values.add(new String[] { song[1], song[2], song[0] });
}
SongsListAdapter adapter = new SongsListAdapter(getActivity().getApplicationContext(),
R.layout.songs, R.id.songsFragment_titleTextView,R.id.songsFragment_artistTextView, values);
setListAdapter(adapter);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.songs, container, false);
return view;
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
}
}
SongsListAdapter
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class SongsListAdapter extends ArrayAdapter<List<String[]>> {
private final Context context;
private final List<String[]> values;
private final Integer listViewId;
private final Integer titleTextViewId;
private final Integer artistTextViewId;
public SongsListAdapter(Context context, Integer listViewId, Integer titleTextViewId,
Integer artistTextViewId, List values) {
super(context, listViewId, values);
this.context = context;
this.listViewId = listViewId;
this.values = values;
this.titleTextViewId = titleTextViewId;
this.artistTextViewId = artistTextViewId;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(listViewId, parent, false);
TextView titleView = (TextView) rowView.findViewById(titleTextViewId);
TextView artistView = (TextView) rowView.findViewById(artistTextViewId);
titleView.setText(values.get(position)[0]);
artistView.setText(values.get(position)[1]);
return rowView;
}
}
PagerAdapter
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class CollectionPagerAdapter extends FragmentPagerAdapter {
public CollectionPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment fragment = new TabFragment();
Bundle args = new Bundle();
args.putInt(TabFragment.ARG_OBJECT, i);
fragment.setArguments(args);
return fragment;
}
#Override
public int getCount() {
return MyApplication.getInstance().infoFragments.length;
}
#Override
public CharSequence getPageTitle(int position) {
String tabLabel = null;
if(0 <= position && position < MyApplication.getInstance().infoFragments.length) {
tabLabel = MyApplication.getInstance().infoFragments[position].getLabel();
}
return tabLabel;
}
}
TabFragment class:
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A fragment that launches other parts of the demo application.
*/
public class TabFragment extends Fragment {
public static final String ARG_OBJECT = "object";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Bundle args = getArguments();
int position = args.getInt(ARG_OBJECT);
int tabLayout = 0;
if(0 <= position && position < MyApplication.getInstance().infoFragments.length) {
tabLayout = MyApplication.getInstance().infoFragments[position].getLayout();
}
View rootView = inflater.inflate(tabLayout, container, false);
return rootView;
}
}
MyApplication class
import android.app.Application;
public class MyApplication extends Application {
//SIGLETON DECLARATION
private static MyApplication mInstance = null;
public static MyApplication getInstance() {
if (mInstance == null) {
mInstance = new MyApplication();
}
return mInstance;
}
public static InfoFragment[] infoFragments = new InfoFragment[] {
new InfoFragment("Songs", R.layout.songs)
};
public static class InfoFragment {
private String label;
private int layout;
public InfoFragment(String label, int layout) {
this.label = label;
this.layout = layout;
}
public String getLabel() {
return label;
}
public int getLayout() {
return layout;
}
}
}

Oh, it seems like you never actually return your SongsFragment in your getItem() method. It actually seems like you never use it!
#Override
public Fragment getItem(int i) {
Fragment fragment = new TabFragment();
Bundle args = new Bundle();
args.putInt(TabFragment.ARG_OBJECT, i);
fragment.setArguments(args);
return fragment;
}