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Can't use Spinner in Android

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;
}
}
}

Passing a string between fragments in a viewpager doesnt work properly

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);

How to add icon into navigation drawer

I blur with the complicate code which is all customize navigation drawer. I just want create a simple navigation with icon only and it using fragment to swap the the content to be display when user click the navigation list.
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) {
android.app.Fragment objFragment = null;
switch (position){
case 0:
objFragment = new Overview();
mTitle = getString(R.string.title_section0);
break;
case 1:
objFragment = new Income();
mTitle = getString(R.string.title_section1);
break;
case 2:
objFragment = new Expenses();
mTitle = getString(R.string.title_section2);
break;
case 3:
objFragment = new Category();
mTitle = getString(R.string.title_section3);
break;
case 4:
objFragment = new CashConverter();
mTitle = getString(R.string.title_section4);
break;
case 5:
objFragment = new History();
mTitle = getString(R.string.title_section5);
break;
}
// update the main content by replacing fragments
android.app.FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, objFragment)
.commit();
}
public void onSectionAttached(int position) {
switch (position) {
case 0:
mTitle = getString(R.string.title_section0);
break;
case 1:
mTitle = getString(R.string.title_section1);
break;
case 2:
mTitle = getString(R.string.title_section2);
break;
case 3:
mTitle = getString(R.string.title_section3);
break;
case 4:
mTitle = getString(R.string.title_section4);
break;
case 5:
mTitle = getString(R.string.title_section5);
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);
}
}
PlaceholderFragment
/**
* 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));
}
}

there are 2 ways to do this.
1. you add the item for the navigation drawer manually.
2. still use list adapter but with overridden getView method and take advantage of TextView compound drawables. You can search for setCompoundDrawablesRelative for more info.
I'm not gonna post the first option since it would need to change many part of the code, but here is the example for the second option.
Find the onCreateView method in your NavigationDrawerFragment class and adapt this pseudocode below to your code.
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mDrawerListView = <get your navigation drawer list view here or leave it like the original>
mDrawerListView.setOnItemClickListener(<for the click listener, again leave it like the original>);
final LayoutInflater inflater1 = inflater; //this is for the child AdapterView to access the inflater
mDrawerListView.setAdapter(new ArrayAdapter<String>(
<get your context here>,
R.layout.simple_activated_list,
R.id.item,
<your array of items to be listed in the drawer>
){
#Override
public View getView(int pos, View convertView, ViewGroup parent){
super.getView(pos, convertView, parent);
if(convertView == null) {
// if the view is null, you need to inflate the view explicitly
convertView = inflater1.inflate(R.layout.simple_activated_list, parent, false);
}
TextView tv = (TextView)convertView.findViewById(R.id.item);
String str = getItem(pos); // for displaying your menu text, since you have overridden it
Drawable d; // for setting up your icon and its size
float density = getResources().getDisplayMetrics().density;
tv.setText(str); // set the text
// you can branch out by menu name or menu order (pos)
switch(str){
case "Your menu text":
// your specific menu item
d = getResources().getDrawable(R.drawable.ic_history);
break;
default:
// else
d = getResources().getDrawable(R.drawable.ic_arrow);
break;
}
// set it to 24dp x 24dp
d.setBounds(0,0,Math.round(24*density),Math.round(24*density));
tv.setCompoundDrawablesRelative(d, null, null, null); // set the icon
return convertView;
}
});
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
}
hope that helps

Issue with switching fragments while using navigation drawer

im having an issue with the navigation drawer. I am using eclipse and using the code it provides for the drawer. I have managed to add additional links to the drawer. When I click on them, the title (in the action bar) changes correctly, but the information doesnt change. I have created all the fragments inside the MainActivity.java file. Below is the code from my MainActivity.java...
MainActivity.java
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) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, SuikodenFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenIIFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenIIIFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenIVFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenVFragment.newInstance(position + 1))
.commit();
}
public void onSectionAttached(int position) {
switch (position) {
case 1:
mTitle = getString(R.string.title_suiko1);
break;
case 2:
mTitle = getString(R.string.title_suiko2);
break;
case 3:
mTitle = getString(R.string.title_suiko3);
break;
case 4:
mTitle = getString(R.string.title_suiko4);
break;
case 5:
mTitle = getString(R.string.title_suiko5);
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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Suikoden 1 Fragment Class
*/
public static class SuikodenFragment 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 SuikodenFragment newInstance(int sectionNumber) {
SuikodenFragment fragment = new SuikodenFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public SuikodenFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.test_drawer_item1, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
/**
* Suikoden 2 Fragment Class
*/
public static class SuikodenIIFragment 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 SuikodenIIFragment newInstance(int sectionNumber) {
SuikodenIIFragment fragment = new SuikodenIIFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public SuikodenIIFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.test_drawer_item2, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
/**
* Suikoden 3 Fragment Class
*/
public static class SuikodenIIIFragment 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 SuikodenIIIFragment newInstance(int sectionNumber) {
SuikodenIIIFragment fragment = new SuikodenIIIFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public SuikodenIIIFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.test_drawer_item3, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
/**
* Suikoden 4 Fragment Class
*/
public static class SuikodenIVFragment 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 SuikodenIVFragment newInstance(int sectionNumber) {
SuikodenIVFragment fragment = new SuikodenIVFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public SuikodenIVFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.test_drawer_item4, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
/**
* Suikoden 5 Fragment Class
*/
public static class SuikodenVFragment 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 SuikodenVFragment newInstance(int sectionNumber) {
SuikodenVFragment fragment = new SuikodenVFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public SuikodenVFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.test_drawer_item5, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
I have checked this site many many times to come up with a solution and have found some 'solutions' that havent worked. For example, placing the onSectionAttached content inside the onNavigationDrawerItemSelected class. However, this doesnt work or crashes the app. I feel that I am close to figuring it out. Any help would be much appreciated! Thanks!

What is this code:
fragmentManager.beginTransaction()
.replace(R.id.container, SuikodenFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenIIFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenIIIFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenIVFragment.newInstance(position + 1))
.replace(R.id.container, SuikodenVFragment.newInstance(position + 1))
.commit();
It should be like this:
switch(position){
case 0:
fragmentManager.beginTransaction()
.replace(R.id.container, SuikodenFragment.newInstance(position + 1)).commit();
//similar for others
}

I ran into the problem of the action bar not updating properly on Back presses using navigation drawer and also that the fragments just weren't working as intended, I posted a code example on this question here.
Android - How to change fragments in the Navigation Drawer

onItemClickListener in ListView not working

I have a ListView within a ListFragment, and currently I just want a click on any of the items to go to ProblemActivity.class, which is currently a barebones 'HelloWorld' activity. Problem is I don't think the onItemClickListener is firing, and I'm not sure why, as I'm an Android novice. Any ideas?
public class MainActivity extends Activity 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 activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// 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 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) {
return true;
}
return super.onOptionsItemSelected(item);
}
#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 PlaceholderFragment (defined as a static inner class
// below).
switch (position) {
case 0:
return MainFragment.newInstance(position);
case 1:
return ProfileFragment.newInstance(position);
case 2:
return ReferenceFragment.newInstance(position);
default:
return MainFragment.newInstance(position);
}
}
#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;
}
}
/**
* The default fragment containing a list view of problems.
*/
public static class MainFragment extends ListFragment {
/**
* 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 MainFragment newInstance(int sectionNumber) {
MainFragment fragment = new MainFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public MainFragment() {
}
static final String[] PROBLEMS = new String[] { "Problem 1", "Problem 2", "Probelm 3",
"Problem 4", "Problem 5", "Problem 6", "Problem 7", "Problem 8",
"Problem 9" };
#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(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));*/
setListAdapter(new ArrayAdapter<String>(getActivity(), R.layout.list_probs,PROBLEMS));
ListView listView = (ListView) rootView
.findViewById(android.R.id.list);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> a, View v, int position,
long id) {
Intent intent = new Intent(MainFragment.this.getActivity(), ProblemActivity.class);
startActivity(intent);
}
});
return rootView;
}
}
/**
* The profile fragment. To be completed later.
*/
public static class ProfileFragment 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 ProfileFragment newInstance(int sectionNumber) {
ProfileFragment fragment = new ProfileFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public ProfileFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_profile, container,
false);
TextView textView = (TextView) rootView
.findViewById(R.id.section_label);
textView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* The reference fragment. To be completed later.
*/
public static class ReferenceFragment 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 ReferenceFragment newInstance(int sectionNumber) {
ReferenceFragment fragment = new ReferenceFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public ReferenceFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_reference, container,
false);
TextView textView = (TextView) rootView
.findViewById(R.id.section_label);
textView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
}
list_probs.xml:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="20sp" >
</TextView>

Try this..
Change this..
ListView listView = (ListView) rootView.findViewById(android.R.id.list);
to
ListView listView = getListView();
EDIT
Add below code after onCreateView
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(getActivity(), R.layout.list_probs,PROBLEMS));
ListView listView = getListView();
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> a, View v, int position,
long id) {
Intent intent = new Intent(MainFragment.this.getActivity(), ProblemActivity.class);
startActivity(intent);
}
});
}

Apart for the other answer you directly add ListItem click event like
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Toast.makeText(getActivity(), PROBLEMS[(int) id],Toast.LENGTH_SHORT).show();
}
For example go to
DemonstrationofusingListFragmenttoshowalistofitemsfromacannedarray.
android-custom-adapter-listview-with-listfragment-and-loadermanager-inside-fragmentactivity

try this,
Add this property in your adapter layout android:descendantFocusability="blocksDescendants" listener of Listview starts working.