Develop Reference

Fragment doesnt show after coming from another fragment/activity

Im using FragmentPagerAdapter and ViewPager to show two fragments. First time when open the fragment, both show/work fine. When I go to another activity or go to another fragment outside these 2 and come back, nothing shows up. Here's the code.
Event:
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Events extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.event, container, false);
// Get the ViewPager and set it's PagerAdapter so that it can display items
ViewPager viewPager = (ViewPager) rootView.findViewById(R.id.pager);
FragmentManager fm = getFragmentManager();
viewPager.setAdapter(new MyFragmentPageAdapter(fm));
// Give the SlidingTabLayout the ViewPager
SlidingTabLayout slidingTabLayout = (SlidingTabLayout) rootView.findViewById(R.id.tabs);
// Center the tabs in the layout
slidingTabLayout.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.ColorSecondary);
}
});
slidingTabLayout.setDistributeEvenly(true);
slidingTabLayout.setViewPager(viewPager);
return rootView;
}
}
MYFramentAdapter.class:
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class MyFragmentPageAdapter extends FragmentPagerAdapter{
final int PAGE_COUNT = 2;
private String tabTitles[] = new String[] { "Upcoming", "Calendar" };
private Context context;
public MyFragmentPageAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return PAGE_COUNT;
}
#Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return FragmentEvents.newInstance(0);
case 1: return FragmentCalendar.newInstance(1);
default: return null;
}
}
#Override
public CharSequence getPageTitle(int position) {
// Generate title based on item position
return tabTitles[position];
}
}

Resolved:
I had to user getChildFragmentManager() in ViewPager because of nested fragments.

Tabs and Swipe - editing the getItem to display 3 different fragments

I have been at this for about 3 days looking up various websites for reference, but I am stuck. I am using the swipe and tabs layout which give you the standard dummy section fragment. But I have 3 separate fragments that I want to display different .xml layouts for. This is the section of code that is bothering me:
import java.util.Locale;
import android.app.ActionBar;
import android.app.FragmentTransaction;
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.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {#link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {#link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
#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));
}
}
#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) {
// 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();
Fragment fragment2 = new DummySectionFragment2();
Fragment fragment3 = new DummySectionFragment3();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
args.putInt(DummySectionFragment2.ARG_SECTION_NUMBER, position + 2);
args.putInt(DummySectionFragment3.ARG_SECTION_NUMBER, position + 3);
fragment.setArguments(args);
fragment2.setArguments(args);
fragment3.setArguments(args);
return fragment2;
}
#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);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
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, container, false);
TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
public static class DummySectionFragment2 extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment2() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView2 = inflater.inflate(R.layout.fragment_2, container, false);
return rootView2;
}
}
public static class DummySectionFragment3 extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number_3";
public DummySectionFragment3() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView3 = inflater.inflate(R.layout.fragment_3, container, false);
return rootView3;
}
}
}
This returns fragment 2. I want to display 3 fragments when each tab is selected. How do I do it? I'm guessing that it's what is returning right?
edit.. ive included the whole java class.. in the hope i can resove this.. How do I use FragmentPagerAdapter to have tabs with different content? ive just tried the following (Second Answer as i didnt understnd what was meant in the first) it didnt work

Use the method this way:
#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.
switch (position) {
case 0:
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(fragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
case 1:
Fragment fragment2 = new DummySectionFragment2();
Bundle args = new Bundle();
args.putInt(fragment2 .ARG_SECTION_NUMBER, position + 2);
fragment2.setArguments(args);
return fragment2;
case 2:
Fragment fragment3 = new DummySectionFragment3();
Bundle args = new Bundle();
args.putInt(fragment3.ARG_SECTION_NUMBER, position + 3);
fragment3.setArguments(args);
return fragment3;
default:
return null;
}
}

How to add class with listview to a viewpager

I'm very new to Android, so forgive me if this is a terrible question, but I've searched high and low and I've been reading lots of material and can't seem to figure this out. I've created an app in Eclipse using one of the default views (fixed tabs + swipe). I created a second class with a listview and I'm trying to add this class to load in one of the tabs.
EDIT to include full MainActivity.java
package com.sonnyparlin.gracietampa;
import java.util.Locale;
import android.app.ActionBar;
import android.app.FragmentTransaction;
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.text.Html;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
#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));
}
}
#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) {
// 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);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
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;
if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) {
rootView = inflater.inflate(R.layout.fragment_main_dummy,
container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Html.fromHtml(getString(R.string.page1text)));
} else if (getArguments().getInt(ARG_SECTION_NUMBER) == 2) {
// I want to add my listview here
} else {
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;
}
}
}
My TechniqueActivity.java file:
public class TechniqueActivity extends ListActivity{
public TechniqueActivity() {
// TODO Auto-generated constructor stub
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// storing string resources into Array
String[] technique_list = getResources().getStringArray(R.array.technique_list);
// Binding resources Array to ListAdapter
this.setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, R.id.label, technique_list));
}
}
I would really appreciate it if someone could point me in the right direction so that I can populate the second tab of my application with the listview I've created in TechniqueActivity.java. Or maybe there's a completely different / better way of doing it?

Okay, after more research and playing around, I found the solution, which was basically what Rarw said in the second part of his answer, which was to use a Fragment instead of an Activity. So, I got rid of TechniqueActivity.java and created a TechniqueFragment instead. Then I call it in the getItem().
package com.sonnyparlin.gracietampa;
import java.util.Locale;
import android.app.ActionBar;
import android.app.FragmentTransaction;
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.text.Html;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {#link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {#link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
#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));
}
}
#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) {
// 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;
if (position == 0 || position == 2) {
fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
} else {
fragment = new TechniqueFragment();
//setContentView(R.layout.technique_activity);
}
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);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
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;
if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) {
rootView = inflater.inflate(R.layout.fragment_main_dummy,
container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Html.fromHtml(getString(R.string.page1text)));
} else {
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;
}
}
public static class TechniqueFragment extends Fragment {
public TechniqueFragment() {
// TODO Auto-generated constructor stub
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View rootView;
rootView = inflater.inflate(R.layout.technique_activity,
container, false);
ListView lv1 = (ListView) rootView.findViewById(R.id.ListView01);
String[] technique_list = getResources().getStringArray(R.array.technique_list);
lv1.setAdapter(new ArrayAdapter<String>(lv1.getContext(), R.layout.list_item, technique_list));
return rootView;
}
}
}

It doesn't look like you're actually using any tabs. Check out this tutorial for the basic idea. If you're going to use tabs you need to (1) create the tabs and then (2) set your activity to be loaded by that tab. The code above just looks like you're creating one activity and then inflating that layout. The blog post provides a good overview of a simple 3 tab application which you can adapt to your case.
The other way to do this would be to use a ViewPager which you can read more about here. The ViewPager approach uses Fragment and not Acitivity. Basicly you create a ViewPager and an adapter which you then add instances of your fragments to. As you swipe the ViewPager rotates through the fragments in the order you add them to the adapter.
Those look like the 2 most relevant ways to approach this situation.

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()));

Android swiping, using ViewPager without tabs

Im trying to make an app that have the navigation type of swiping.
This is how far I have gone:
Fragment activity:
package com.app.BoomBase;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment_control extends Fragment {
String tag = this.getClass().getSimpleName();
#Override
public void onCreate(Bundle savedInstanceState) {
Log.i(tag, "onCreate");
super.onCreate(savedInstanceState);
/** Getting the arguments to the Bundle object */
Bundle data = getArguments();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.i(tag, "onCreateView");
View view = inflater.inflate(R.layout.fragment_controle,container, false );
return view;
}
}
FragmentPageAdapter:
package com.app.BoomBase;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class Fragment_Pager extends FragmentPagerAdapter {
final int PAGE_COUNT = 3;
public Fragment_Pager(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
#Override
public Fragment getItem(int arg0) {
Fragment_control myFragment = new Fragment_control();
Bundle data = new Bundle();
data.putInt("current_page", arg0+1);
myFragment.setArguments(data);
return myFragment;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return PAGE_COUNT;
}
}
MainActivity:
package com.app.BoomBase;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends FragmentActivity {
String tag = this.getClass().getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.i(tag, "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/** Getting a reference to the ViewPager defined the layout file */
ViewPager pager = (ViewPager) findViewById(R.id.pager);
/** Getting fragment manager */
FragmentManager fm = getSupportFragmentManager();
/** Instantiating FragmentPagerAdapter */
Fragment_Pager pagerAdapter = new Fragment_Pager(fm);
/** Setting the pagerAdapter to the pager object */
pager.setAdapter(pagerAdapter);
}
}
But my problem is that i can't figure out how to add fragments to the code. I want to swipe to the next activity with buttons and stuff on them. How do I do that ?

PageAdapter uses your getItem() to switch between Fragments, this is where you would declare which page does what. "Position" 0 is the first page, 1 is the second and so forth. You can simply return a new instance of your other Fragments or pass arguments if you wish.
For example:
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
// Your current main fragment showing how to send arguments to fragment
Fragment_control myFragment = new Fragment_control();
Bundle data = new Bundle();
data.putInt("current_page", position+1);
myFragment.setArguments(data);
return myFragment;
case 1:
// Calling a Fragment without sending arguments
return new MySecondFragment();
case 2:
return new MyThirdFragment();
default:
return null;
}
}
Then you would create a Fragment class for each of those you want to incorporate. In my example you would have a class for MySecondFragment and MyThirdFragment
public class MySecondFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.second_fragment, null);
return view;
}
}
And
public class MyThirdFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.third_fragment, null);
return view;
}
}
Any fragment may simply inflate a standard xml layout file, to access the children in the layout you would have to remember to use the following, I'll use MySecondFragment as an example.
Let's say you have two Buttons with id's R.id.button1 and R.id.button2 in a layout file titled 'second_fragment':
public class MySecondFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.second_fragment, null);
// Make sure to add the parent inflater before and layout child call
Button btn_one = (Button)view.findViewById(R.id.button1);
Button btn_two = (Button)view.findViewById(R.id.button2);
return view;
}
}
Edit
To start at a page other then 0 or the first position you would simply use setCurrentItem() in your MainAvticity, like so:
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.i(tag, "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager pager = (ViewPager) findViewById(R.id.pager);
FragmentManager fm = getSupportFragmentManager();
Fragment_Pager pagerAdapter = new Fragment_Pager(fm);
// Here you would declare which page to visit on creation
pager.setAdapter(pagerAdapter);
pager.setCurrentItem(1);
}

I have added this in fragment class ..
the issue i got is cannot resolve cannot resolve get support fragment manager ().
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.i(tag, "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager pager = (ViewPager) findViewById(R.id.pager);
FragmentManager fm = getSupportFragmentManager();
Fragment_Pager pagerAdapter = new Fragment_Pager(fm);
// Here you would declare which page to visit on creation
pager.setAdapter(pagerAdapter);
pager.setCurrentItem(1);
}