I have implemented a TabLayout in android with two fragments. In one fragment I added a ListView. I am retrieving data from server to fill up the ListView. Everything was working fine until I tried to access the ListView from the MainActivity class.
I need access of the same listview(which is in the fragment) from the MainActivity where I created the TabLayout to load data. The fragment is created for a tab of the tablayout.
I added the code below.
Can anyone tell me how can I access that ListView from the MainActivity?
MainActivity.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detailed_report);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.ic_launcher));
tabLayout.addTab(tabLayout.newTab().setIcon(R.mipmap.ic_launcher));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setVisibility(View.INVISIBLE);
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
ReportListFragment.java
public class ReportListFragment extends Fragment{
private SimpleDateFormat mFormatter = new SimpleDateFormat("MMMM dd yyyy hh:mm aa");
Date newDate;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_item_list, container, false);
finder_sharedprefs = getActivity().getSharedPreferences(FINDERPREFERENCES, Context.MODE_PRIVATE);
listView=(ListView) view.findViewById(R.id.list);
reportLayout = (RelativeLayout) view.findViewById(R.id.new_report);
} catch (ParseException e) {
e.printStackTrace();
}
}
return view;
}
}
Kindly check this answer if it helps you,
In your respective Fragment code create a public function
FragmentA.java
create a function like below.
public void getData(int r) {
Log.e("data got from Activity", "" + r); // this is sample
//Do your updations to list view here.
}
Now in your mainActivity.java call this function like below wherever you want
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new FragmentA().getData(34);
}
});
Now check the log cat. you will see the number 34 is printed.
Let me know if you have any queries.
Related
i'm trying to create an Fragment with a tabs
first the main Activity has a bottom navigation with
4 fragments. 1 of the fragments i want to make a tabs which will insert another Fragment so basically the Fragment has a tabs with Fragment
and i have Class MyPagerAdapter here is the java file
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View pop = inflater.inflate(R.layout.fragment_adopt,
container, false);
TabLayout tabLayout = (TabLayout) pop.findViewById(R.id.tablayout);
tabLayout.addTab(tabLayout.newTab().setText("DOGS"));
tabLayout.addTab(tabLayout.newTab().setText("CATS"));
tabLayout.setTabGravity(tabLayout.GRAVITY_FILL);
final ViewPager viewpager = (ViewPager) pop.findViewById(R.id.pager);
final PagerAdapter adapter = new MyPagerAdapter.(getSupportFragmentManager().tablayout.getTabCount()) ;
ViewPager.setAdapter(adapter);
ViewPager.setOnPageListener(new tabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewpager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
return inflater.inflate(R.layout.fragment_adopt,container,false);
}
#Override
public void onFragmentInteraction(Uri uri) {
}
The problem is that the GetSupportFragment doesn't funtioning
thank you for answering and Godbles
The definition of getChildFragmentManager() is:
Return a private FragmentManager for placing and managing Fragments inside of this Fragment.
The definition of getSupportFragmentManager():
Return the FragmentManager for interacting with fragments associated with this fragment's activity.
I created an app on AS and I use Tab Layout with View Pager, Fragment in it from this site!
and I want to access each fragment layout (I have 3 fragment) to apply some changes on them. I searched about it in the Internet but I could not find anything about it.
Without seeing any code or errors.. I'll try to give the best answer I can.. In the class you set up the tab layout you can create the page fragments like so:
public class TabLayoutActivity extends MainActivity{
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab_layout);
ViewPager vp = (ViewPager) findViewById(R.id.view_pager);
this.addPages(vp);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(vp);
tabLayout.setOnTabSelectedListener(listener(vp));
}
//ADD ALL PAGES
private void addPages(ViewPager pager) {
MyFragPagerAdapter adapter = new MyFragPagerAdapter(getSupportFragmentManager());
Tab1Fragment tab1Fragment = new Tab1Fragment();
adapter.addPage(mondayFragment);
Tab2Fragment tab2Fragment = new Tab2Fragment();
adapter.addPage(tab2Fragment);
Tab3Fragment tab3Fragment = new Tab3Fragment();
adapter.addPage(tab3Fragment);
pager.setAdapter(adapter);
}
private TabLayout.OnTabSelectedListener listener(final ViewPager pager) {
return new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
pager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
};
}
}
You then create 3 classes, Tab1Fragment, Tab2Fragment, and Tab3Fragment, aswell as the xml layouts for each. Here is an example of one of the tab fragment classes:
public class Tab1Fragment extends Fragment{
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab1_fragment, null);
}
#Override
public String toString() {
return "Tab 1";
}
}
This is a very simple example to give you an idea. You can then change the xml layout in the corresponding fragment class. Let me know if you have any questions
I have a recyclerview inside a fragment which is inside viewpager. I have button outside viewpager. How to update the recyclerview upon clicking the button.
public class Level2MainActivity_grid1 extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.level2mainlayout_place1);
// I am putting a viewpager with fragments into them and put tabs
ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager(), Titles, Numboftabs);
viewPager.setAdapter(pagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);
tabLayout.setupWithViewPager(viewPager);
Button buttonId = (Button) findViewById(R.id.planmytraveludupitown);
buttonId.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//I want to save some things and do the changes in the recyclerview of tab 0;
}
});
}
}
The framgment code in tab 0 of the viewpager, in which i am using recyclerview is as below:
public class Udupiwhattosee extends Fragment {
private RecyclerView rv;
private List<Udupiwhattoseearray> udupiwhattoseearray;
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
RecyclerView v =(RecyclerView) inflater.inflate(R.layout.tab_1,container,false);
v.setLayoutManager(new LinearLayoutManager(getActivity()));
v.setHasFixedSize(true);
initializeData();
WhattoseeRVAdapter adapter = new WhattoseeRVAdapter(udupiwhattoseearray,container.getContext());
v.setAdapter(adapter);
return v;
}
private void initializeData(){
udupiwhattoseearray = new ArrayList<>();
udupiwhattoseearray.add(new Udupiwhattoseearray("Udupi Sri Krishna Temple", "Udupi, Karanata,INDIA", R.drawable.udupi));
udupiwhattoseearray.add(new Udupiwhattoseearray("Udupi place 2", "Udupi, Karanata,INDIA", R.drawable.udup_krishna_math_gopura_udupi));
udupiwhattoseearray.add(new Udupiwhattoseearray("Udupi Place 3", "Udupi, Karanata,INDIA", R.drawable.udupi_rath));
udupiwhattoseearray.add(new Udupiwhattoseearray("Udupi place 4", "Udupi, Karanata,INDIA", R.drawable.udupi_window));
}
recycler_view.post(new Runnable() {
public void run() {
adapter.notifyDataSetChanged();
}
});
HERE you will see the working of interface ,try this hope its gonna work fine
i wanted to know if someone can help me solve this issue. I have a button setup and when its clicked, its supposed to navigate to another viewpager page. But everytime its clicked, the app crashes returning the error at onClick at fragmenttab2 class. Here is my Main Activity.
public class MainActivity extends SherlockFragmentActivity {
ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
viewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
viewPager.setCurrentItem(1);
}
}
Here is the fragment containing the onClick:
public class FragmentTab1 extends SherlockFragment {
ViewPager viewPager;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Activity activity = getActivity();
if (activity != null) {
addListenerOnButton();
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragmenttab1, container, false);
return view;
}
public void addListenerOnButton() {
Button nextfrag = (Button) getView().findViewById(R.id.btn_nextfrag);
nextfrag.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
((ViewPager) viewPager.findViewById(R.id.pager)).setCurrentItem(1);
}
});
}
}
The log:
E/AndroidRuntime java.lang.NullPointerException
E/AndroidRuntime com.test.seriessample.FragmentTab1$1.onClick(FragmentTab1.java:58)
your viewPager is probably null. I also see that viewPager itself is a ViewPager and in the onClick you search for another ViewPager within that ViewPager which doesn't seem right.
EDIT:
you should add something like this in your activity
public ViewPager getPager() {
return viewPager;
}
And in the onClick of your Fragment
((MainActivity) getActivity()).getPager().setCurrentItem(1);
I've been wrestling with this for quite a while now.
I switched from having a regular Activity to now using fragments (by users recommendations), but I've been getting the same issue.
I have 3 pages that are now 3 fragments inside of a ViewPager. I want the button with the id addSiteButton in the addSite fragment; when clicked, to scroll over to setCurrentItem(2).
Any help is appreciated! Here's my code.
The FragmentActivity
public class fieldsActivity extends FragmentActivity {
private static final int NUMBER_OF_PAGES = 3;
ViewPager mPager;
MyFragmentPagerAdapter mMyFragmentPagerAdapter;
/**
* Called when the activity is first created.
*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// to create a custom title bar for activity window
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.fields);
// use custom layout title bar
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.topbar);
mPager = (ViewPager) findViewById(R.id.fieldspager);
mMyFragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
mPager.setAdapter(mMyFragmentPagerAdapter);
mPager.setCurrentItem(1);
}
private static class MyFragmentPagerAdapter extends FragmentPagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int page) {
switch (page) {
case 0: return new settingFields();
case 1: return new addSite();
case 2: return new createSite();
}
return null;
}
#Override
public int getCount() {
return NUMBER_OF_PAGES;
}
}
The class with the button
public class addSite extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
if (container == null) {
return null;
}
RelativeLayout mRelativeLayout = (RelativeLayout) inflater.inflate(R.layout.add_site, container, false);
final ViewPager mPager = (ViewPager) mRelativeLayout.findViewById(R.id.fieldspager);
Button addSiteButton = (Button) mRelativeLayout.findViewById(R.id.addSiteButton);
addSiteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mPager.setCurrentItem(2, true);
}
});
return mRelativeLayout;
}
}
I feel like I'm going in circles and not getting the desired motion.
Thanks for the help!
Simply make the Fragment as a class inside the FragmentActivity and take out the variable shadowing in onCreateView() since your pager is a global variable.
public class fieldsActivity extends FragmentActivity {
private static final int NUMBER_OF_PAGES = 3;
ViewPager mPager;
MyFragmentPagerAdapter mMyFragmentPagerAdapter;
/**
* Called when the activity is first created.
*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// to create a custom title bar for activity window
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.fields);
// use custom layout title bar
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.topbar);
mPager = (ViewPager) findViewById(R.id.fieldspager);
mMyFragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
mPager.setAdapter(mMyFragmentPagerAdapter);
mPager.setCurrentItem(1);
}
public static class addSite extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RelativeLayout mRelativeLayout = (RelativeLayout) inflater.inflate(R.layout.add_site, container, false);
//final ViewPager mPager = (ViewPager) mRelativeLayout.findViewById(R.id.fieldspager);
Button addSiteButton = (Button) mRelativeLayout.findViewById(R.id.addSiteButton);
addSiteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mPager.setCurrentItem(2, true);
}
});
return mRelativeLayout;
}
}
}
Also consider using the #Override annotation whenever you override a method so you don't make mistakes and use proper naming conventions. Java classes start with a capital.