Develop Reference

Android ViewPager FragmentManager cannot be applied error

I'm using pager view in the regular way. in the code below I get the error: android.support.v4.app.FragmentManager cannot be applied to android.app.FragmentManager. I checked all the solutions for this and implemented them as it can be seen (the import's seems OK), and still I have this error...
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
public class MyActivity extends FragmentActivity {
private static int NUM_PAGES = 0; //The number of pages to show.
private static ViewPager mPager; //The pager widget
private static PagerAdapter mPagerAdapter; //The pager adapter
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
mPager = (ViewPager) findViewById(R.id.pager);
//Next line is error
mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPager.setAdapter(mPagerAdapter);
}
/**
* A simple pager adapter
*/
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return MyFragment.create(position);
}
#Override
public int getCount() {
return NUM_PAGES;
}
}
...
}

Use getSupportFragmentManager() instead of getFragmentManager(). Accordingly to the imports of your class you are using the Fragment from the support's library

How can I access localised strings from within a static FragmentPagerAdapter

I have followed official documentation on how to implement swipe views with TabStrip instead of Tabs in order to create a Fragment (FragmentMyAccount.class) that contains Nested Fragments (FragmentMyProfile.class and FragmentMyLibrary.class). These nested fragments correspond to the two tabs managed by a childFragmentManager.
The two tabs and astuetz's pagerSlidingTabStrip work fine, but adapter's getPageTitle method doesn't have access to String resources and can only return a hardcoded string for each tab title (see on the bottom of the code). The compile-time error that appears when I try to access the xml resources reads:
"FragmentMyAccount.this cannot be referenced from a static context"
If the code below is not possible to tweak, what alternative implementation would be adequate to achieve my goal?
package com.kouretinho.myapp;
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;
import com.astuetz.PagerSlidingTabStrip;
public class FragmentMyAccount extends Fragment {
private static final int NUM_ITEMS = 2;
MyAccountAdapter mAdapter;
ViewPager mPager;
PagerSlidingTabStrip mTabStrip;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_my_account, container, false);
// Initialize the FragmentPager Adapter
mAdapter = new MyAccountAdapter(getChildFragmentManager());
// Initialize the ViewPager and set an adapter
mPager = (ViewPager) rootView.findViewById(R.id.viewpager_my_account);
mPager.setAdapter(mAdapter);
// Initialize the TabStrip and bind the tabs to the ViewPager
mTabStrip = (PagerSlidingTabStrip) rootView.findViewById(R.id.viewpager_tab_strip);
mTabStrip.setViewPager(mPager);
return rootView;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
public static class MyAccountAdapter extends FragmentPagerAdapter{
private static final int MY_PROFILE = 0;
private static final int MY_LIBRARY = 1;
private static final String sExceptionMessage = "FragmentPagerAdapter was asked to getItem " +
"with position other than 0 or 1. This FragmentPagerAdapter can only return one of" +
"two Fragments at position 0 or 1.";
public MyAccountAdapter(FragmentManager fm){
super(fm);
}
#Override
public int getCount() {
return FragmentMyAccount.NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
switch (position){
case MY_PROFILE:
return new UserProfileFragment();
case MY_LIBRARY:
return new UserBooksFragment();
default:
throw new IllegalStateException(sExceptionMessage);
}
}
#Override
public CharSequence getPageTitle(int position) {
switch (position){
case MY_PROFILE:
// ********** THIS LINE IS PROBLEMATIC, cannot get Localised String resources
return FragmentMyAccount.this.getActivity().getResources().getString(R.id.my_profile);
case MY_LIBRARY:
return "my_library";
default:
return "no_title";
}
}
}
}

In your case you have to replace:
public static class MyAccountAdapter extends FragmentPagerAdapter
with
public class MyAccountAdapter extends FragmentPagerAdapter
Another way to fix this is to pass Context to MyAccountAdapter in constructor (like you do with FragmentManager).

android error implementing pager on fragment

Im implementing a pager inside a fragment, but i get this error
The method getSupportFragmentManager() is undefined for the type
HowToUse_phone
on
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
here the code,
package com.chocte.ks_documents;
import java.util.Locale;
import android.os.Bundle;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.actionbarsherlock.app.SherlockFragment;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
public class HowToUse_phone extends SherlockFragment{
private LinearLayout lLayoutFrgHow;
ViewPager mViewPager;
SectionsPagerAdapter mSectionsPagerAdapter;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
//return inflater.inflate(R.layout.activity_how_phone, container, false);
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
//mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager = (ViewPager) getView().findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
//get the layou8t
lLayoutFrgHow=(LinearLayout) inflater.inflate(R.layout.activity_how_phone, container, false);
return lLayoutFrgHow;
}
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.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
//return getString(R.string.title_section1).toUpperCase(l);
return "a";
case 1:
//return getString(R.string.title_section2).toUpperCase(l);
return "b";
case 2:
//return getString(R.string.title_section3).toUpperCase(l);
return "c";
}
return null;
}
}
/**
* 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(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
}
I saw is some problems when importing fragment, but as you see in my code im android.support.v4.app...
what else is the problem?
thanks!

Instead of calling getSupportFragmentManager() call getSherlockActivity().getSupportFragmentManager(). You're now trying to call a method from SherlockActivity but you're in SherlockFragment; that's why you need to get a ref first to SherlockFragment object ...
But above will fix only the compile error ... I am not sure if you have any other problems in your code. According to previous answer you didn't instantiate your fragment view at the proper time.

You are trying to fetch the View, before you have inflated the Layout.
Assuming R.layout.activity_how_phone contains the Id to the ViewPager your trying to fetch here:
mViewPager = (ViewPager) getView().findViewById(R.id.pager);
It should be something like this:
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
lLayoutFrgHow=(LinearLayout) inflater.inflate(R.layout.activity_how_phone, container, false);
mViewPager = (ViewPager) lLayoutFrgHow.findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
//get the layout
return lLayoutFrgHow;
Besides that, why are you using a ViewPager within a Fragment? Usually its used wtihin an Activity, and it is hosting the Fragments.
And in addition your using 2 Different Kinds of Fragments. In your ViewPager you are using Fragments from support v4, and your Class is a SherlockFragment.

How to repeat the fragments (like a loop)?

i am developing an app which has a few fragments and i have set them up using an adapter which extends fragmentpager adapter, and i want the fragments to repeat when any of the end is reached. for e.g if i have set up 4 fragments and then when the user reaches the 4th fragment ,instead of blocking the view,the view should shift to the first fragment ...
i have been able to set up the fragments but don't know how to achieve this loop thing...
here is the code for the adapter
package sourcecode.jazzplayer;
import java.util.List;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.Fragment;
import android.support.v4.app.ListFragment;
public class ViewPagerAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
private static String[] titles = new String[] {"Songs", "My Playlists", "Artists","Albums"};
public ViewPagerAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
#Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
#Override
public int getCount() {
return this.fragments.size();
}
#Override
public String getPageTitle( int position )
{
return titles[ position ];
}
}
and here is the code how i have set up the fragments
package sourcecode.jazzplayer;
import java.util.List;
import java.util.Vector;
import sourcecode.jazzplayer.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
public class MyMusic extends FragmentActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mymusic);
List<Fragment> fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this, FragmentSongs.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentArtists.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentPlaylists.class.getName()));
fragments.add(Fragment.instantiate(this, FragmentAlbums.class.getName()));
ViewPagerAdapter adapter = new ViewPagerAdapter(super.getSupportFragmentManager(), fragments);
ViewPager pager = (ViewPager)super.findViewById(R.id.viewpager);
pager.setAdapter(adapter);
pager.setOffscreenPageLimit(4);
pager.setCurrentItem(0);
}
}

Check the Infinite Viewpager project on Github.

It is very simple with a FragmentPagerAdapter:
#Override
public Fragment getItem(int position) {
return this.fragments.get(position % 4);
}
#Override
public long getItemId(int position) {
return position % 4;
}
#Override
public int getCount() {
return Integer.MAX_VALUE;
}
And when initializing the ViewPager set the initial page to a very high value, so you can move the pages both ways. For 4 pages, 0x40000000 is roughly half of Integer.MAX_VALUE and is divisible by 4 (id is 0).

I just pushed my recent code to GitHub LoopingViewPager, I hope this will help you.
This ViewPager can work with views and with fragments, only small code modifications are needed in your adapter and xml files.

Android - Getting context of a fragment in a pager

I have a android application using a pager as navigation. For the tabs I have 3 layouts as content. On one of the fragments is a gallery and I want to add images to it. For that I have to set an ImageAdapter but I need to know how to access the context of a fragment.
final LayoutInflater factory = getLayoutInflater();
final View view = factory.inflate(R.layout.pictures, null);
Gallery g = (Gallery) view.findViewById(R.id.gallery1);
g.setAdapter(new ImageAdapter(view.getContext()));
I use this code above in the onCreate method to get the gallery from a layout that is not the contentview.
I have to give a Context to the ImageAdapter. But what context do I have to set there?
EDIT: This is my complete code:
package com.bw2801.uwelugemediathek;
import java.util.Locale;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.content.Context;
import android.database.DataSetObserver;
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.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.SpinnerAdapter;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
PicturesSectionFragment ps = new PicturesSectionFragment();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// 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);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
final LayoutInflater factory = getLayoutInflater();
final View view = factory.inflate(R.layout.pictures, null);
Gallery g = (Gallery) view.findViewById(R.id.gallery1);
g.setAdapter(new ImageAdapter(ps.getActivity()));
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private Integer[] mImageIds = {
R.drawable.image01,
R.drawable.image02,
R.drawable.image03,
R.drawable.image04,
R.drawable.image05,
R.drawable.image06,
R.drawable.image07,
R.drawable.image08,
};
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mImageIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(mContext);
i.setImageResource(mImageIds[position]);
i.setLayoutParams(new Gallery.LayoutParams(150, 100));
i.setScaleType(ImageView.ScaleType.FIT_XY);
return i;
}
}
#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 void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
#Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
/**
* 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) {
switch(position) {
case 0:
return new DummySectionFragment();
case 1:
return new SoundSectionFragment();
case 2:
return ps;
}
return new DummySectionFragment();
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Informationen";
case 1:
return "Soundboard";
case 2:
return "Galerie";
}
return null;
}
}
public static class DummySectionFragment extends Fragment {
public DummySectionFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.info, container, false);
}
}
public static class PicturesSectionFragment extends Fragment {
public PicturesSectionFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.pictures, container, false);
}
}
public static class SoundSectionFragment extends Fragment {
public SoundSectionFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.sounds, container, false);
}
}
}

Fragments don't have their own Context, they use parent Activity.
To get parent Activity Context, use getActivity()
To use Application Context, use getActivity().getApplicationContext()
Prefer Application Context wherever possible.
UPDATE:
getActivity() of a Fragment returns an Activity instance if and only if, the said Fragment is currently attached to an Activity.
So,
Fragment f = new MyFragment();
creates a fragment, but it is not attached to an activity yet. Hence f.getActivity() returns null.
After its added to an activity:
getFragmentManager().beginTransaction().add(f,"fragment").commit();
Now, getActivity() will return an Activity instance.
Again, if we detach the fragment from Activity:
getFragmentManager().beginTransaction().detach(f).commit()
getActivity() will again return a null value.
So, we should not use getActivity() outside the Fragment class, because we can't be sure of attached status. Thus I'll advice you to used getActivity() inside the fragment's own class in its methods: onAttach(), onCreate() or onActivityCreated().

you can use like this
g.setAdapter(new ImageAdapter(getActivity()));

The easiest and most precise way to get the context of the fragment that I found is to get it directly from the ViewGroup when you call onCreateView method at least here you are sure not to get null for getActivity()
public class Animal extends Fragment {
Context thiscontext;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
thiscontext = container.getContext();

write under code in Your CoreApplication.java
step1)
public class CoreApplication extends Application {
private static CoreApplication instance;
}
step2) onCreate(){
instance = this;
}
step3 )
add under method()
public static CoreApplication getGlobalApplicationContext() {
if (instance == null) {
throw new IllegalStateException("this application does not
inherit GlobalApplication"); " +
"}
return instance;
}
Step4)
g.setAdapter(new ImageAdapter(getGlobalApplicationContext()));