Develop Reference

Pageviewer in a NestedScrollView not displaying text

I am using a PageViewer to display fragment's data, and whenever I put a TextView into the fragment's xml, it doesn't display when the app is being run. I put it in a NestedScrollView to put more widgets in then I could without it. I tried putting an ImageView in to see if it was removing everything but that worked fine, except it was a little laggy when changing fragments.
My code for my activity is
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.view_pager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new VolleyballFragment(), "Volleyball");
adapter.addFragment(new SoftballFragment(), "Softball");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
my fragment codes are the nearly same so I will only provide 1
public class VolleyballFragment extends Fragment{
public VolleyballFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_volleyball, container, false);
}
}
and the activity xml file is
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:layout_height="wrap_content"
android:layout_width="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"></androidx.appcompat.widget.Toolbar>
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.tabs.TabItem
android:id="#+id/softballFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Softball" />
<com.google.android.material.tabs.TabItem
android:id="#+id/volleyballFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Vollyball" />
</com.google.android.material.tabs.TabLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<androidx.viewpager.widget.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
If you need any of the xml files or anything else please let me know.
I fallowed an older tutorial online since this is my first time using fragments and tabs, so I'm a little confused to begin with
Also sorry for the code being cut off and replaced as normal text

I tried your code everything else is fine but you're just missing layout_behavior on NestedScrollView.
After adding this property your code would look like this.
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
android:fillViewport="true">
<androidx.viewpager.widget.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</androidx.core.widget.NestedScrollView>

How do i get the menu options menu to appear in ViewPager Fragments?

I have a FragmentActivity that has a ViewPager in it and need an options menu in the action bar at the top of the screen. The calls to public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) in the Fragments that I am adding to the ViewPager never gets called and so the options menu is never created and no action bar is shown.
I have added setHasOptionsMenu(true); to the public void onCreate(#Nullable Bundle savedInstanceState) of the Fragments.
I have also tried adding the options menu directly to the FragmentActivity that contains the ViewPager but this does not seem to work either.
MainActivity
public class MainActivity extends FragmentActivity {
private PagerAdaptor pager;
#Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_main);
setupPageViewer();
super.onCreate(savedInstanceState);
}
private void setupPageViewer() {
UIControlSurface cs = new UIControlSurface();
UIControlSurface cs2 = new UIControlSurface();
pager = new PagerAdaptor(getSupportFragmentManager());
pager.addPage(cs);
pager.addPage(cs2);
ViewPager v_pager = (ViewPager)super.findViewById(R.id.view_pager);
v_pager.setAdapter(pager);
v_pager.postInvalidate();
}
}
activity_main.xml
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/button_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="visible"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="visible" />
</android.support.constraint.ConstraintLayout>
UIControlSurface.java
public class UIControlSurface extends Fragment implements UIEditableListener{
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.ui_control_surface, container, false);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
Log.i("Menu Inflation", "Here i am!");// never logged
inflater.inflate(R.menu.navi, menu);
}
#RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.navi_enter_edit:
return true;
case R.id.navi_cancel:
return true;
}
return false;
}
}
ui_control_surface.xml
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/button_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/add_button"
style="#style/Widget.AppCompat.Button.Colored"
android:layout_width="52dp"
android:layout_height="54dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="+"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
With the setHasOptionsMenu(true); called in the onCreate method of the fragment I would expect the menu to be created but the action bar and options menu never appear. The Fragments appear in the ViewPager as expected, just with no options menu visible.

Fragments of view pager needs to be programmed from the main activity

I am using a view pager . I have three fragments in it I added a button in one of them and tried to make a method for it in the fragment class but this doesn't work. I tried after that to put the method in the main Activity class and it worked.
this is my MainActivity code :
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
assert actionBar != null;
actionBar.setDisplayShowTitleEnabled(false);
mAuth = FirebaseAuth.getInstance();
mViewPager = findViewById(R.id.viewpager);
adapter = new SamplePagerAdapter(this);
tabLayout = findViewById(R.id.tablayout);
mViewPager.setAdapter(adapter);
tabLayout.setupWithViewPager(mViewPager);
mViewPager.setCurrentItem(1);
TextView tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabOne.setText("تعلم");
tabOne.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.learn, 0, 0);
tabLayout.getTabAt(0).setCustomView(tabOne);
TextView tabTwo = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabTwo.setText("الصفحة الرئيسية");
tabTwo.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.home, 0, 0);
tabLayout.getTabAt(1).setCustomView(tabTwo);
TextView tabThree = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabThree.setText("التحديات");
tabThree.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.challenges, 0, 0);
tabLayout.getTabAt(2).setCustomView(tabThree);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
tabPosition = tab.getPosition();
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.myQuestions:
//newGame();
return true;
case R.id.aboutApp:
//showHelp();
return true;
case R.id.bestStudents:
//showHelp();
return true;
case R.id.myAccount:
//showHelp();
return true;
case R.id.signOut:
mAuth.signOut();
Intent i = new Intent(MainActivity.this, GeneralSignActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public void onBackPressed() {
super.onBackPressed();
if(tabPosition != 1){
mViewPager.setCurrentItem(1);
}
else{
this.finishAffinity();
System.exit(0);
}
}
}
and this is my fragment code :
public static LearnFragment newInstance(String param1, String param2) {
LearnFragment fragment = new LearnFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
myView=inflater.inflate(R.layout.fragment_learn,container,false);
return myView;
}
And this is the xml code of the main activity :
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/sample_main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/color1">
<TextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/app_name"
android:textColor="#color/white"
android:textSize="#dimen/text_size_in_toolbar" />
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/color1">
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="#android:color/white" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
and this is the fragment xml code :
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.mk.playAndLearn.fragment.LearnFragment">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/button"
android:onClick="click3"
android:text="click me"/>
</FrameLayout>

and tried to make a method for it in the fragment class but this
doesn't work
If you have added a Button to the Fragment, then you should initialize the Button inside the Fragment with the view prefix and adding the Button inside the Fragment layout too. So:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
myView = inflater.inflate(R.layout.fragment_learn,container,false);
Button myBtn = myView.findViewById(R.id.thebuttonid);
// use onClickListener here to handle the button
return myView;
}
I suppose you were handling the Button inside the MainActivity class which won't probably work.
You are handling the Button with onClick in the xml so, place the current code inside the Fragment and outside of onCreateView or any other methods:
public void click3(View v) {
switch(v.getId()) {
// do your stuff here
}
}

How to set view to a specific fragment when clicked recognized in navigation drawer in Android?

I have used a sectionsPageAdapter class in Java which is given below.
This is a tabbed activity and I later added a navigation drawer to it.
Now I wish to let user navigate through tabs from the main activity by swiping (which works successfully) and also through nav drawer as I have included the same fragments names there also.
what code should i write in the switch case to direct user to the clicked fragment activity?
Main Activity.java
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private SectionsPageAdapter mSectionsPageAdapter;
private ViewPager mViewPager;
private ArrayAdapter<String> mAdapter;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG,"onCreate: Starting");
mSectionsPageAdapter =new SectionsPageAdapter(getSupportFragmentManager());
mViewPager =(ViewPager)findViewById(R.id.container);
setupViewPager(mViewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
mDrawerLayout =(DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList=(ListView)findViewById(R.id.navList);
addDrawerItems();
mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position)
{
case 0:
// what Code??
break;
case 1:
break;
}
}
});
}
private void setupViewPager(ViewPager viewPager){
SectionsPageAdapter adapter=new SectionsPageAdapter(getSupportFragmentManager());
adapter.addFragment(new Tab1Fragment(),"Our Picks");
adapter.addFragment(new Tab2Fragment(),"Technology");
adapter.addFragment(new Tab3Fragment(),"Fashion");
viewPager.setAdapter(adapter);
}
private void addDrawerItems() {
String[] osArray = { "Our Picks", "Technology","Fashion" };
mAdapter = new ArrayAdapter<String>(this,R.layout.drawerpart1, osArray);
mDrawerList.setAdapter(mAdapter);
}
SectionsPageAdapter.java
public class SectionsPageAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList=new ArrayList<>();
private final List<String> mFragmentTitleList=new ArrayList<>();
public void addFragment(Fragment fragment,String title){
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public SectionsPageAdapter(FragmentManager fm) {
super(fm);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:id="#+id/drawer_layout"
android:layout_height="match_parent"
tools:context="com.example.aa.news.MainActivity">
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
<ListView
android:id="#+id/navList"
android:layout_width="250dp"
android:layout_height="match_parent"
android:layout_gravity="left|start"
android:background="#ffeeeeee"/>
</android.support.v4.widget.DrawerLayout>
drawerpart1.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/label"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip"
android:textSize="16dip"
android:textStyle="bold" >
</TextView>
Tab1Fragment
public class Tab1Fragment extends Fragment {
private static final String TAG = "Tab1Fragment";
private Button btn1;
#Nullable
#Override
public View onCreateView(#Nullable LayoutInflater inflater, #Nullable ViewGroup container,#Nullable Bundle savedInstanceState)
{
View view= inflater.inflate(R.layout.tab1_fragment,container,false);
btn1=(Button) view.findViewById(R.id.btn1);
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getActivity(),"Button 1 Clicked",Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
tab1_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="#+id/btn1"
android:text="Button 1" />
<TextView
android:layout_height="60dp"
android:layout_width="120dp"
android:id="#+id/tv1"
android:text="Fragment 1"/>
</LinearLayout>
The other fragments tab2 and 3 are same as tab 1.

Use setCurrentItem() on viewpager
mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener(){
#Override
public void onItemClick (AdapterView < ? > parent, View view,int position, long id){
mViewPager.setCurrentItem(position);
}
});

Unfrotunatly App stopped Navigation Drawer

This is my MainActivity.java File.
I got error while MainActivity is running in app. What should i do ?
public class MainActivity extends ActionBarActivity implements
NavigationDrawerFragment.NavigationDrawerCallbacks {
private Button btnTutor;
private Button btnStudent;
private TextView repIssue;
private TextView appVersion;
/**
* 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);
// Set up the drawer.
mNavigationDrawerFragment.setUp(R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
setContentView(R.layout.activity_main);
OnClickListener socialsClickListener = new OnClickListener(){
#Override
public void onClick(View v) {
Intent viewIntent = null;
viewIntent = new Intent(getApplicationContext(), MainActivity.class);
viewIntent.putExtra("PAGE", getSocialClicked(v.getId()));
startActivity(viewIntent);
}
};
// Loading Font Face
Typeface tfTitle = Typeface.createFromAsset(getAssets(), "Roboto-Light.ttf");
Typeface tfButtons = Typeface.createFromAsset(getAssets(), "Eraser.ttf");
((TextView) findViewById(R.id.txt_title)).setTypeface(tfTitle);
btnTutor = (Button)findViewById(R.id.btn_tutor);
btnTutor.setOnClickListener(socialsClickListener);
btnTutor.setTypeface(tfButtons);
btnStudent = (Button)findViewById(R.id.btn_student);
btnStudent.setOnClickListener(socialsClickListener);
btnStudent.setTypeface(tfButtons);
repIssue = (TextView) findViewById(R.id.txt_report);
repIssue.setOnClickListener(socialsClickListener);
appVersion = (TextView) findViewById(R.id.txt_app_version);
appVersion.setOnClickListener(socialsClickListener);
mNavigationDrawerFragment = (NavigationDrawerFragment) getSupportFragmentManager()
.findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
}
#Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager
.beginTransaction()
.replace(R.id.container,
PlaceholderFragment.newInstance(position + 1)).commit();
}
public void onSectionAttached(int number) {
switch (number) {
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;
}
}
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);
}
/**
* 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));
}
}
private String getSocialClicked(int id){
switch (id) {
case R.id.btn_tutor:
return "http://m.getedgeucated.com/sshs/dashboard/login.html";
case R.id.btn_student:
return "http://m.getedgeucated.com/sshs/timecheck.html";
case R.id.txt_app_version:
return "http://m.getedgeucated.com/sshs/appsupport.html";
case R.id.txt_report:
return "http://sshs.getedgeucated.com/chatsupport_redirect.html";
default:
return "";
}
}
}
`
This is my activity_main.xml.
`
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/activity_vertical_margin"
android:layout_gravity="center"
android:src="#drawable/getedgeucated_logo"
android:adjustViewBounds="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:textStyle="bold"
android:text="#string/logo_desc"
android:textColor="#android:color/darker_gray"
android:textAppearance="?android:attr/textAppearanceMedium"/>
<TextView
android:id="#+id/txt_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/dp_margin"
android:layout_gravity="center"
android:gravity="center"
android:textStyle="bold"
android:text="#string/subtitle"
android:textColor="#android:color/darker_gray"
android:textAppearance="?android:attr/textAppearanceLarge"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:orientation="vertical">
<Button
android:id="#+id/btn_student"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/half_padding"
android:background="#drawable/btn_home"
android:gravity="center"
android:text="I am a student"
android:textColor="#ffffff"
android:textSize="#dimen/text_size_large"
android:textStyle="bold" />
<Button
android:id="#+id/btn_tutor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="I am a tutor"
android:textStyle="bold"
android:textColor="#ffffff"
android:textSize="#dimen/text_size_large"
android:background="#drawable/btn_home"
android:layout_margin="#dimen/half_padding"/>
</LinearLayout>
<TextView
android:id="#+id/txt_report"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:textStyle="bold"
android:text="#string/report_issue"
android:textColor="#color/background"
android:textAppearance="?android:attr/textAppearanceSmall"/>
<TextView
android:id="#+id/txt_app_version"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="#string/app_version"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#color/background"
android:textStyle="bold" />
`
I still get error of FATAL EXCEPTION: main Java.io.NullpointerException error in debugger.

Begin with these steps :
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
//The rest of your code