My main activity has 3 tabs, each one loads a different fragment.
i am trying to pass data from fragment 1 to fragment 3, but it doesnt work
all 3 fragment can be loaded, but the problem is that only 1&2 are loaded when i start the application. so when i run the application and i want to pass a string from fragment 1 to 3 it doesnt work because it doesnt exist yet. how can i change this?
I am using Eventbus (https://github.com/greenrobot/EventBus) for the communication between fragments.
public class MainActivity extends AppCompatActivity {
private Toolbar mToolbar;
private TabLayout mTabLayout;
private ViewPager mPager;
private MyPagerAdapter mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAdapter = new MyPagerAdapter(getSupportFragmentManager());
mToolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(mToolbar);
mTabLayout = (TabLayout) findViewById(R.id.tab_layout);
mPager = (ViewPager) findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
mTabLayout.setTabsFromPagerAdapter(mAdapter);
mTabLayout.setupWithViewPager(mPager);
mPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static class MyFragment extends Fragment {
public static final java.lang.String ARG_PAGE = "arg_page";
public MyFragment() {
}
public static MyFragment newInstance(int pageNumber) {
MyFragment myFragment = new MyFragment();
Bundle arguments = new Bundle();
arguments.putInt(ARG_PAGE, pageNumber + 1);
myFragment.setArguments(arguments);
return myFragment;
}
}
class MyPagerAdapter extends FragmentStatePagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
Fragment fragment = MainActivity.MyFragment.newInstance(position); //FRAGMENT fragment;
switch (position) {
case 0:
fragment = new Fragment1();
break;
case 1:
fragment = new Fragment2();
break;
case 2:
fragment = new Fragment3();
break;
default:
break;
}
return fragment;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) { //set tab names
switch (position) {
case 0:
return "Thread";
case 1:
return "AsyncTask";
case 2:
return "TODO";
}
return null;
}}}
Minimum number of pages you want your adapter to load is set this way
Viewpager.setOffscreenPageLimit(3);
Related
I'm a beginner. I am having a problem with Spinner. I'm using tabbed activity with fragments. When I add spinner in fragment main and add listener to it and when I run the app, it crashes, saying
( java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Spinner.setOnItemSelectedListener(android.widget.AdapterView$OnItemSelectedListener)' on a null object reference)
I've checked everything and seems fine. I don't know what is the matter, please guys help me out. I really need to fix this bug, my Android Studio version is 2.1.2
MainActivity.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner)findViewById(R.id.spin);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this, parent.getItemAtPosition(position).toString(), Toast.LENGTH_SHORT).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* 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 PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
}
}
This is one of my first apps. I want to know how I can detect what sliding tab the user is currently on. I know it in ViewPagerAdapter but I can't do anything because it's a fragment. How can I access this information?
MainActivity.java
public class MainActivity extends AppCompatActivity {
Toolbar mToolbar;
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[] = {"Factorial", "Permutation", "Random"};
int Numboftabs = 3;
FloatingActionButton fab;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.fab_pressed);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
fab = (FloatingActionButton) findViewById(R.id.fab);
fab.show(false);
//Animation FAB
Animation animation = AnimationUtils.loadAnimation(this, R.anim.simple_grow);
fab.startAnimation(animation);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
Toast.makeText(this, "Text", Toast.LENGTH_SHORT).show();
Animation animation = AnimationUtils.loadAnimation(this, R.anim.simple_grow);
fab = (FloatingActionButton) findViewById(R.id.fab);
fab.startAnimation(animation);
return true;
}
return super.onOptionsItemSelected(item);
}
}
ViewPagerAdapter.java
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
CharSequence Titles[]; // This will Store the Titles of the Tabs which are Going to be passed when ViewPagerAdapter is created
int NumbOfTabs; // Store the number of tabs, this will also be passed when the ViewPagerAdapter is created
// Build a Constructor and assign the passed Values to appropriate values in the class
public ViewPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) {
super(fm);
this.Titles = mTitles;
this.NumbOfTabs = mNumbOfTabsumb;
}
//This method return the fragment for the every position in the View Pager
#Override
public Fragment getItem(int position) {
if(position == 0) // if the position is 0 we are returning the First tab
{
FactorialTab factorialTab = new FactorialTab();
return factorialTab;
} else if(position == 1) // As we are having 2 tabs if the position is now 0 it must be 1 so we are returning second tab
{
PermutationTab permutationTab = new PermutationTab();
return permutationTab;
}
else {
RandomTab randomTab = new RandomTab();
return randomTab;
}
}
// This method return the titles for the Tabs in the Tab Strip
#Override
public CharSequence getPageTitle(int position) {
return Titles[position];
}
// This method return the Number of tabs for the tabs Strip
#Override
public int getCount() {
return NumbOfTabs;
}
}
RandomTab.java (one of the sliding tabs)
public class RandomTab extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.tab_random, container, false);
return v;
}
}
Set an OnPageChangeListener to your ViewPager
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if (position == WHATEVER) {
//do what you want
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
I Create New Navigation Drawer Activity use Android Studio 1.2.1.1, i have some problem in switch the fragment.
My Activity :
public class MainActivity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {#link #restoreActionBar()}.
*/
private CharSequence mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
#Override
public void onNavigationDrawerItemSelected(int position) {
Fragment fragment = null;
switch (position) {
case 1 :
fragment = new List();
break;
}
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment).commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_home);
break;
case 2:
mTitle = getString(R.string.title_list);
break;
case 3:
mTitle = getString(R.string.title_history);
break;
case 4:
mTitle = getString(R.string.title_data);
break;
case 5:
mTitle = getString(R.string.title_download);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
public void onButtonLogoutClick (View v) {
if(v.getId()==R.id.bLogout) {
Intent l = new Intent (MainActivity.this, Login.class);
startActivity(l);
finish();
}
}
}
The problem is here : (required : android.support.v4.app.Fragment)
Fragment fragment = null;
switch (position) {
case 1 :
fragment = new List();
break;
}
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment).commit();
List.java :
public class List extends Fragment {
public List(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_list, container, false);
return rootView;
}
}
I have searched for like three days for a solution for this. I have tried a lot of methods but I couldn't get it right. (Or maybe I am doing something wrong where).
So, what I am trying to do is change the Activity title to the current tab name, each time I change the tab, the activity title should change too.
So I have a MainActivity where I have 3 Tabs and 3 different fragments for the tabs. Here the MainActivity:
public class MainActivity extends ActionBarActivity {
private Toolbar toolbar;
private ViewPager mPager;
private SlidingTabLayout mTabs;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
mPager = (ViewPager) findViewById(R.id.pager);
mPager.setAdapter(new CustomPagerAdapter(getSupportFragmentManager()));
mTabs = (SlidingTabLayout) findViewById(R.id.tabs);
mTabs.setDistributeEvenly(true);
mTabs.setViewPager(mPager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//Custom ViewPager for the tabs
class CustomPagerAdapter extends FragmentPagerAdapter {
String[] tabsTitles;
String vpPager;
public CustomPagerAdapter(FragmentManager fm) {
super(fm);
tabsTitles = getResources().getStringArray(R.array.tabTitles);
}
#Override
public Fragment getItem(int position) {
//if (position == 0){
// news_fragment news_fragment = new news_fragment();
// return news_fragment;
//}
if (position == 1){
login_fragment login_fragment = new login_fragment();
return login_fragment;
}
else if (position == 2){
about_fragment about_fragment = new about_fragment();
return about_fragment;
}
else {
news_fragment news_fragment = new news_fragment();
return news_fragment;
}
}
#Override
public CharSequence getPageTitle(int position) {
return tabsTitles[position];
}
#Override
public int getCount() {
return 3;
}
}
}
And I am using this SlidingTabLayout
Try this one :
viewpager
.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
actionBar.setTitle(tabsTitles[position]);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageScrollStateChanged(int pos) {
// TODO Auto-generated method stub
}
});
When you change activity. Firstlt onCreate method run. So in you onCreate get ActionBar and set its title.
EXAMPLE
ActionBar actionBar = getActionBar();
actionBar.setTitle("title");
Note : Change getActionBar() to getSupportActionBar() if you are using the support library for ActionBar.
Try this one too:
class CustomPagerAdapter extends FragmentPagerAdapter {
....
Toolbar toolbar;
public CustomPagerAdapter(FragmentManager fm, Toolbar toolbar) {
...
this.toolbar = toolbar;
}
#Override
public Fragment getItem(int position) {
toolbar.setTitle(getPageTitle(position));
...
}
...
}
Set a custom action bar in your activity by inflating some layout like(After Oncreate):
android.app.ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#ffffff")));
bar.setDisplayShowHomeEnabled(false);
bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
bar.setCustomView(R.layout.homescreen_actionbar);
Take a TextView in your custom layout and in the onresume method of your fragment fetch its id using getactivity(), and set your title and iit will be working fine.
I cannot figure out how to get PreferenceFragment to work correctly. I have a ViewPager hooked up to a FragmentPagerAdapter, with two Fragments that the user can swipe between. I am trying to get the "Settings" menu working, using a PreferenceFragment, but I am unsure what I'm doing wrong. When I tap Settings the view is changed to a blank white screen.
My SettingsFragment class:
public class SettingsFragment extends PreferenceFragment{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
My PagerAdapter class:
public class PagerAdapter extends FragmentPagerAdapter {
SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>();
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Object instantiateItem(ViewGroup container, int position){
Fragment fragment = (Fragment) super.instantiateItem(container, position);
registeredFragments.put(position, fragment);
return fragment;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
registeredFragments.remove(position);
super.destroyItem(container, position, object);
}
#Override
public Fragment getItem(int i) {
switch (i) {
// default case is also case 0 to avoid redundant code
default: return new CalculatorFragment();
case 1: return new TapeFragment();
}
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 1: return "Review";
default: return "Calculator";
}
}
public Fragment getRegisteredFragment(int position){
return registeredFragments.get(position);
}
}
My main class which should create the PreferenceFragment when user taps "Settings"
public class MangoCalc extends FragmentActivity implements CalculatorFragment.CalcTapeInterface{
PagerAdapter pagerAdapter;
ViewPager myViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
final ActionBar actionBar = getActionBar();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mango_calc);
pagerAdapter = new PagerAdapter(getFragmentManager());
myViewPager = (ViewPager) findViewById(R.id.main);
myViewPager.setAdapter(pagerAdapter);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
ActionBar.TabListener tabListener = new ActionBar.TabListener() {
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
myViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {}
};
for (int i=0; i< pagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab()
.setText(pagerAdapter.getPageTitle(i))
.setTabListener(tabListener));
}
myViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener());
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.mango_calc, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
FragmentManager fm = getFragmentManager();
SettingsFragment settingsFragment = new SettingsFragment();
fm.beginTransaction().replace(R.id.main, settingsFragment).commit();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onTapePass(ArrayList<String> data) {
if (data!=null) Log.d("Tape", "Last element got: "+data.get(data.size()-1));
TapeFragment tapeFragment = (TapeFragment) pagerAdapter.getRegisteredFragment(1);
tapeFragment.updateTape(data);
}
}
My preferences.XML
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="#string/lookandfeel">
<ListPreference
android:key="theme_preference"
android:title="#string/theme"
android:summary="#string/summary_theme_preference"
android:entries="#array/entries_theme_preference"
android:entryValues="#array/entryvalues_theme_preference"
android:defaultValue="mango"/>
<SwitchPreference
android:key="keypress_vibration_preference"
android:title="#string/keypress_vibration"
android:summaryOn="#string/summaryon_keypress_vibration_preference"
android:summaryOff="#string/summaryoff_keypress_vibration_preference"
android:switchTextOn="#string/text_keypress_vibration_on"
android:switchTextOff="#string/text_keypress_vibration_off"
android:defaultValue="true" />
</PreferenceCategory>
</PreferenceScreen>
and the XML for the activity:
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/main"
/>
In your getitem case 1 needs to be listed before the default