I am trying to create a fragment that would have a ViewPager. When the said fragment is called and committed, it only displays the first image and it is not swipable. Any thoughts how to achieve this?
Here is the Fragment
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class HowToFragment extends Fragment {
private ViewPager mViewPager;
private MyAdapter mAdapter;
private int[] image_id = {R.drawable.image_1, R.drawable.image_2, R.drawable.image_3};
private static int image_pos = 0;
public static Fragment newInstance(int pos){
image_pos = pos;
return new HowToFragment();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_how_to_image, container, false);
v.setBackgroundResource(image_id[image_pos]);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mViewPager = new ViewPager(getActivity());
mViewPager.setId(R.id.viewPager_howto);
FragmentManager fm = getFragmentManager();
mAdapter = new MyAdapter(fm);
new setAdapterTask().execute();
}
private class setAdapterTask extends AsyncTask<Void,Void,Void>{
protected Void doInBackground(Void... params) {
return null;
}
#Override
protected void onPostExecute(Void result) {
mViewPager.setAdapter(mAdapter);
}
}
private class MyAdapter extends FragmentStatePagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
#Override
public int getCount() {
return image_id.length;
}
#Override
public Fragment getItem(int position) {
return HowToFragment.newInstance(position);
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
FragmentManager manager = getFragmentManager();
FragmentTransaction ft = manager.beginTransaction();
ft.remove((Fragment) object);
ft.commit();
super.destroyItem(container, position, object);
}
}
}
I doubt you are trying to run this app in Android version less than Honeycomb. What you are trying to achieve is nested fragments. Nested fragment support is available only since jellybean 4.2
Related
Good night, I'm new at this, the think that i need to do is this effect using a sroll which conceal a title & displays the following. For example: what happens in the contact list, when you spend the A and B, but still keeps all contacts letter.
I have an example implemented in ios with ViewForHeaderInSection this is what they used to do this effect in instagram this is what I need to do in android.
This is the closest thing I found:
Visit How to implement a scroll view on only part of my layout
Thanks, I apologize for my English is not excellent.
after search and search, i develop my woner layour with propierties...
This class help tu implements a #SlidePage into Fragment.
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import java.util.ArrayList;
import java.util.List;
import mijem.bitgray.us.mijem_android.R;
public class FragmentTutorial extends Fragment {
/**
* The number of pages (wizard steps) to show in this demo.
*/
private static final int NUM_PAGES = 3;
/**
* The pager widget, which handles animation and allows swiping horizontally
* to access previous and next wizard steps.
*/
private ViewPager mPager;
/**
* The pager adapter, which provides the pages to the view pager widget.
*/
private PagerAdapter mPagerAdapter;
ImageView indicator0;
ImageView indicator1;
ImageView indicator2;
List<ImageView> listIndicators = new ArrayList<ImageView>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
ViewGroup rootView = (ViewGroup) inflater.inflate(
R.layout.fragment_viewpager_tutorial, container, false);
// Instantiate a ViewPager and a PagerAdapter.
mPager = (ViewPager) rootView.findViewById(R.id.pager);
mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
resetIndicators();
listIndicators.get(mPager.getCurrentItem()).setImageResource(
R.drawable.indicador_slide_on);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
mPagerAdapter = new ScreenSlidePagerAdapter(getActivity()
.getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
indicator0 = (ImageView) rootView.findViewById(R.id.indicator0);
indicator1 = (ImageView) rootView.findViewById(R.id.indicator1);
indicator2 = (ImageView) rootView.findViewById(R.id.indicator2);
listIndicators.add(indicator0);
listIndicators.add(indicator1);
listIndicators.add(indicator2);
return rootView;
}
#Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
//TabListener.onResumeFragment(this);
}
public void resetIndicators() {
for (ImageView img : listIndicators)
img.setImageResource(R.drawable.indicador_slide_off);
}
/**
* A simple pager adapter that represents 5 ScreenSlidePageFragment objects,
* in sequence.
*/
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
ScreenSlidePageFragment fragment = new ScreenSlidePageFragment();
fragment.setPosition(position);
return fragment;
}
#Override
public int getCount() {
return NUM_PAGES;
}
}
}
enter code here
and the adapter:
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
ScreenSlidePageFragment fragment = new ScreenSlidePageFragment();
fragment.setPosition(position);
return fragment;
}
#Override
public int getCount() {
return NUM_PAGES;
}
}
enter code here
Code of fragmen pattern
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import java.util.ArrayList;
import java.util.List;
import mijem.bitgray.us.mijem_android.R;
public class FragmentTutorial extends Fragment {
/**
* The number of pages (wizard steps) to show in this demo.
*/
private static final int NUM_PAGES = 3;
/**
* The pager widget, which handles animation and allows swiping horizontally
* to access previous and next wizard steps.
*/
private ViewPager mPager;
/**
* The pager adapter, which provides the pages to the view pager widget.
*/
private PagerAdapter mPagerAdapter;
ImageView indicator0;
ImageView indicator1;
ImageView indicator2;
List<ImageView> listIndicators = new ArrayList<ImageView>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
ViewGroup rootView = (ViewGroup) inflater.inflate(
R.layout.fragment_viewpager_tutorial, container, false);
// Instantiate a ViewPager and a PagerAdapter.
mPager = (ViewPager) rootView.findViewById(R.id.pager);
mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
resetIndicators();
listIndicators.get(mPager.getCurrentItem()).setImageResource(
R.drawable.indicador_slide_on);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
mPagerAdapter = new ScreenSlidePagerAdapter(getActivity()
.getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
indicator0 = (ImageView) rootView.findViewById(R.id.indicator0);
indicator1 = (ImageView) rootView.findViewById(R.id.indicator1);
indicator2 = (ImageView) rootView.findViewById(R.id.indicator2);
listIndicators.add(indicator0);
listIndicators.add(indicator1);
listIndicators.add(indicator2);
return rootView;
}
#Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
//TabListener.onResumeFragment(this);
}
public void resetIndicators() {
for (ImageView img : listIndicators)
img.setImageResource(R.drawable.indicador_slide_off);
}
/**
* A simple pager adapter that represents 5 ScreenSlidePageFragment objects,
* in sequence.
*/
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
ScreenSlidePageFragment fragment = new ScreenSlidePageFragment();
fragment.setPosition(position);
return fragment;
}
#Override
public int getCount() {
return NUM_PAGES;
}
}
}
In my app I want to use swipe views of four tabs inside a fragment. The four tabs are contains different fragments each and all the four fragments are sliding by swipe from right to left or vice versa. The fragments are working fine but the tabs are not visible within the fragment. Anyone have any solution for this. Thanks in advance :)
this is the main fragment which contains the tabs:-
public class DashboardTabFragment extends Fragment implements ActionBar.TabListener {
private static final String ARG_SECTION_NUMBER = "arg_section_number";
private String[] tabTitle = {"Cleanness", "Product Display", "Hygiene", "Asm Visits"};
public static DashboardTabFragment newInstance(int position) {
DashboardTabFragment fragment = new DashboardTabFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, position);
fragment.setArguments(args);
return fragment;
}
private ViewPager viewPager;
public DashboardTabFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_dashboard_tab, container, false);
setHasOptionsMenu(true);
ActionBar actionBar = ((ActionBarActivity) getActivity()).getSupportActionBar();
assert actionBar != null;
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setHomeButtonEnabled(true);
actionBar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
viewPager = (ViewPager) rootView.findViewById(R.id.pager);
TabPageAdapter tabPageAdapter = new TabPageAdapter(getActivity().getSupportFragmentManager(), getActivity());
viewPager.setAdapter(tabPageAdapter);
for (String aTabTitle : tabTitle)
actionBar.addTab(actionBar.newTab().setText(aTabTitle).setTabListener(this));
return rootView;
}
This is the adapter for fragments:-
public class TabPageAdapter extends FragmentPagerAdapter {
Context context;
public TabPageAdapter(FragmentManager fm,Context context) {
super(fm);
this.context = context;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new CleannessChartFragment(context);
case 1:
return new ProductDisplayChartFragment(context);
case 2:
return new HygieneChartFragment(context);
case 3:
return new AsmVisitsChartFragment(context);
}
return null;
}
#Override
public int getCount() {
return 4;
}
I found the solution. I used TabHost for tabs with viewpager.
This is my fragment :-
package com.itpp.trt;
import android.annotation.TargetApi;
import android.app.Activity;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTabHost;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TabHost;
public class DashboardTabFragment extends Fragment implements ViewPager.OnPageChangeListener {
private static final String ARG_SECTION_NUMBER = "arg_section_number";
private ViewPager mViewPager;
private TabHost tabHost;
private String[] tabSpec = {"Tab_1", "Tab_2", "Tab_3", "Tab_4"};
private String[] tabTitle = {"Cleanness", "Product Display", "Hygiene", "Asm Visits"};
private TabHost.TabContentFactory mFactory = new TabHost.TabContentFactory() {
#Override
public View createTabContent(String tag) {
View v = new View(getActivity());
v.setMinimumHeight(0);
return v;
}
};
public static DashboardTabFragment newInstance(int position) {
DashboardTabFragment fragment = new DashboardTabFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, position);
fragment.setArguments(args);
return fragment;
}
public DashboardTabFragment() {
tabHost = null;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_dashboard_tab, container, false);
mViewPager = (ViewPager) rootView.findViewById(R.id.pager);
mViewPager.setAdapter(new TabPageAdapter(getChildFragmentManager(), getActivity()));
tabHost = (TabHost) rootView.findViewById(android.R.id.tabhost);
tabHost.setup();
mViewPager.setOnPageChangeListener(this);
for (int i = 0; i < tabSpec.length; i++) {
tabHost.addTab(tabHost.newTabSpec(tabSpec[i]).setIndicator(tabTitle[i]).setContent(mFactory));
}
tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
#Override
public void onTabChanged(String tabId) {
if (tabId.equals("Tab_1")) {
mViewPager.setCurrentItem(0);
} else if (tabId.equals("Tab_2")) {
mViewPager.setCurrentItem(1);
} else if (tabId.equals("Tab_3")) {
mViewPager.setCurrentItem(2);
} else if (tabId.equals("Tab_4")) {
mViewPager.setCurrentItem(3);
}
}
});
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MyActivity) activity).onSectionAttached(getArguments().getInt(ARG_SECTION_NUMBER));
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
tabHost.setCurrentTab(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
#Override
public void onDetach() {
super.onDetach();
}
}
This is my tabpager adapter :-
package com.itpp.trt;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentStatePagerAdapter;
/**
* Created by biswajit on 28-11-14.
*/
public class TabPageAdapter extends FragmentStatePagerAdapter{
Context context;
public TabPageAdapter(FragmentManager fm,Context context) {
super(fm);
this.context = context;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new CleannessChartFragment(context);
case 1:
return new ProductDisplayChartFragment(context);
case 2:
return new HygieneChartFragment(context);
case 3:
return new AsmVisitsChartFragment(context);
}
return null;
}
#Override
public int getCount() {
return 4;
}
}
Hope this helps other. Thanks :)
I'm trying to build a simple application that displays two fragments. The first fragment is displayed by default. It contains a list of names which you can choose and when you click on one of the items, it supposes to display a second fragment with a text view, displaying the name you have chosen.
The problem is everytime I click one of the names on the list, it throws me a NullPointerException. I really don't know what could be the problem.
Here are the codes( The app contains three class - two fragments and one activity. The FriendsF fragment is the list fragment and it performs well. The second fragment is FeedFragment and onitemclick it should display the name that was clicked)
FriendsF fragment:
package com.example.fragmentsexcersize;
import android.app.Activity;
import android.app.ListFragment;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class FriendsF extends ListFragment {
private static final String[] FRIENDS = { "ladygaga", "msrebeccablack",
"taylorswift13" };
public interface SelectionListener {
public void onItemSelected(int position);
}
private SelectionListener mCallback;
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ? android.R.layout.simple_list_item_activated_1
: android.R.layout.simple_list_item_1;
setListAdapter(new ArrayAdapter<String>(getActivity().getBaseContext(), layout, FRIENDS));
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (SelectionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement SelectionListener");
}
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (isInTwoPaneMode()) {
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}
}
#Override
public void onListItemClick(ListView l, View view, int position, long id) {
mCallback.onItemSelected(position);
}
private boolean isInTwoPaneMode() {
return getFragmentManager().findFragmentById(R.id.tweets) != null;
}
}
FeedFragment:
package com.example.fragmentsexcersize;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class FeedFragment extends Fragment{
private TextView mTextView;
private static final String[] data = { "ladygaga", "msrebeccablack",
"taylorswift13" };
public FeedFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.tweet_view, container, false);
mTextView = (TextView) rootView.findViewById(R.id.tweet_view);
return rootView;
}
public void updateFeedDisplay(int position) {
mTextView.setText(data[position]);
}
}
MainActivity:
package com.example.fragmentsexcersize;
import android.app.Activity;
import android.app.FragmentManager;
import android.os.Bundle;
import android.app.FragmentTransaction;
public class MainActivity extends Activity implements FriendsF.SelectionListener{
private FriendsF mFriendsFragment;
private FeedFragment mFeedFragment;
private FragmentManager fragMana;
private FragmentTransaction transaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mFriendsFragment = new FriendsF();
fragMana = getFragmentManager();
transaction = fragMana.beginTransaction();
transaction.add(R.id.friends, mFriendsFragment);
transaction.commit();
}
private boolean isInTwoPaneMode() {
return findViewById(R.id.tweets) == null;
}
public void onItemSelected(int position) {
if (mFeedFragment == null)
mFeedFragment = new FeedFragment();
if (!isInTwoPaneMode()) {
transaction = fragMana.beginTransaction();
transaction.add(R.id.tweets, mFeedFragment);
transaction.commit();
}
mFeedFragment.updateFeedDisplay(position);
}
}
Make the following changes to your source:
MainActivity
public void onItemSelected(int position) {
Bundle bundle = new Bundle();
if (mFeedFragment == null)
mFeedFragment = new FeedFragment();
if (!isInTwoPaneMode()) {
bundle.putInt("POSITION", position);
mFeedFragment.setArguments(bundle);
transaction = fragMana.beginTransaction();
transaction.replace(R.id.tweets, mFeedFragment);
transaction.commit();
}
}
FeedFragment
private TextView mTextView;
private static final String[] data = { "ladygaga", "msrebeccablack",
"taylorswift13" };
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle) {
View rootView = inflater.inflate(R.layout.tweet_view, container, false);
mTextView = (TextView) rootView.findViewById(R.id.tweet_view);
int mPosition = getArguments().getInt("POSITION", 0);
mTextView.setText(data[mPosition]);
return rootView;
}
I have a ViewPager setup with 3 fragment Classes, and a pageadapter class.
MainActivity class
package com.example.swipeview;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
public class MainActivity extends FragmentActivity {
ViewPager viewpager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewpager = (ViewPager) findViewById(R.id.viewpagers);
com.example.swipeview.PagerAdapter padapter = new com.example.swipeview.PagerAdapter(getSupportFragmentManager());
viewpager.setAdapter(padapter);
}
}
PageAdapter class
package com.example.swipeview;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class PagerAdapter extends FragmentPagerAdapter {
public PagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
#Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
switch(arg0){
case 0:
return new FragmentOne();
case 1:
return new FragmentTwo();
case 2:
return new FragmentThree();
default:
break;
}
return null;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return 3;
}
}
and my first FragmentClass as an example
package com.example.swipeview;
import com.example.swipeview.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentOne extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState){
return inflater.inflate(R.layout.fragment_one_layout, container, false);
}
}//end of class
I've tried my usual methods for creating a listview inside of an Activity class but that doesn't work with the fragment class. I was wondering if anyone could show me how to code a listview into a fragment class.
An example with a custom adapter (using a List as source):
public class ItemsFragment extends Fragment {
/* Must be populated later. */
private final List<Item> items = new ArrayList<>();
private ItemAdapter adapter;
private ListView listView = null;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View layout = inflater.inflate(R.layout.fragment_items_list, container, false);
adapter = new ItemAdapter(this.getActivity(), items);
listView = (ListView) layout.findViewById(R.id.listview_items);
return layout;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Item currentItem = adapter.getItem(position);
// (...)
}
});
}
/* (...) */
}
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;
}