I got a problem with updating ViewPager fragments. We need to show fragments with data to registered user, when he doesn't registered we need to show fragments with message to register. I use this method to check it in MainActivity:
#Override
public void setAdapter(boolean isUserExist) {
Log.d("RegDebug", "In setAdapter");
mainPagerAdapter.clearData();
mainPagerAdapter.addFragment(searchFragment, getString(R.string.search_title));
if (isUserExist) {
Log.d("RegDebug", "In setAdapter reg");
mainPagerAdapter.addFragment(new ChatsFragment(), getString(R.string.chats_title));
mainPagerAdapter.addFragment(new ActionsFragment(), getString(R.string.actions_title));
Toast.makeText(getApplicationContext(), "Registered!", Toast.LENGTH_SHORT).show();
} else {
Log.d("RegDebug", "In setAdapter unreg");
mainPagerAdapter.addFragment(RegisterFragment.newInstance(Consts.CHATS_TAB_NAME), getString(R.string.chats_title));
mainPagerAdapter.addFragment(RegisterFragment.newInstance(Consts.ACTIONS_TAB_NAME), getString(R.string.actions_title));
Toast.makeText(getApplicationContext(), "Unregistered!!!", Toast.LENGTH_SHORT).show();
}
mainPagerAdapter.notifyDataSetChanged();
viewPager.setAdapter(mainPagerAdapter);
}
I call this method in presenter with setting value from firebase auth, checking if user exists:
public void checkForUserExist() {
if (mainInteractor.isUserExist()) {
getViewState().setRegAdapter();
} else getViewState().setUnregAdapter();
}
And then call presenter method in onCreate of MainActivity:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dialogFragment = new FilterDialogFragment();
searchFragment = new SearchFragment();
//UI
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = findViewById(R.id.main_view_pager);
tabLayout = findViewById(R.id.main_tabs);
//mainPagerAdapter = new MainPagerAdapter(getSupportFragmentManager());
mainPresenter.checkForUserExist();
tabLayout.setupWithViewPager(viewPager);
}
I try to log the boolean result and it returns exactly value that must be, but pager adapter can't update its content.Code of MainPagerAdapter:
public class MainPagerAdapter extends FragmentPagerAdapter{
private final List<Fragment> fragmentList = new ArrayList<>();
private final List<String> fragmentTitleList = new ArrayList<>();
public MainPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
#Override
public int getCount() {
return fragmentTitleList.size();
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return fragmentTitleList.get(position);
}
public void addFragment(Fragment fragment, String title){
fragmentList.add(fragment);
fragmentTitleList.add(title);
}
public void clearData(){
fragmentList.clear();
fragmentTitleList.clear();
notifyDataSetChanged();
Log.d("RegDebug", " fragmentList size is " + fragmentList.size()
+ " fragmentTitleList size is " + fragmentTitleList.size());
}
}
Use OnPageChangeListener of ViewPager class & notify to your current fragment from there using interface.
Related
In my application , I have ViewPager containing 3 fragments (Home , Profile and More)
Home Fragment contain RecyclerView
when i navigate from Home Fragment to Profile Fragment or More Fragment, it work like expected.
But when i navigate back to Home Fragment , items in RecyclerView duplicate...
And when i navigate again and back , it duplicate again
Here is my MainActivity.java Code:
public class MainActivity extends AppCompatActivity {
TabLayout mainTabLayout;
ViewPager mainViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainTabLayout = findViewById(R.id.main_tablayout);
mainViewPager = findViewById(R.id.main_viewpager);
mainTabLayout.setupWithViewPager(mainViewPager);
//to put mainTabLayout Icons...
MainTabLayoutIcons();
}
//to Change MainLayout Icons...
private void MainTabLayoutIcons() {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
// add fragments to the adapter
adapter.addFragment(new Home());
adapter.addFragment(new MyActivity());
adapter.addFragment(new More());
mainViewPager.setOffscreenPageLimit(0);
mainViewPager.setAdapter(adapter);
// Select Home tab as default tab on startup
mainViewPager.setCurrentItem(0);
mainTabLayout.getTabAt(0).select();
// Set tabs Initial icons
mainTabLayout.getTabAt(0).setIcon(R.drawable.home_black);
mainTabLayout.getTabAt(1).setIcon(R.drawable.user_outline);
mainTabLayout.getTabAt(2).setIcon(R.drawable.more_outline);
/* tabSelectedListener to change the icon color once it is selected
// and change it back once another tab is selected */
mainTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
if (tab.getPosition() == 0) {
mainTabLayout.getTabAt(0).setIcon(R.drawable.home_black);
mainTabLayout.getTabAt(1).setIcon(R.drawable.user_outline);
mainTabLayout.getTabAt(2).setIcon(R.drawable.more_outline);
}
if (tab.getPosition() == 1) {
mainTabLayout.getTabAt(0).setIcon(R.drawable.home_outline);
mainTabLayout.getTabAt(1).setIcon(R.drawable.user_);
mainTabLayout.getTabAt(2).setIcon(R.drawable.more_outline);
}
if (tab.getPosition() == 2) {
mainTabLayout.getTabAt(0).setIcon(R.drawable.home_outline);
mainTabLayout.getTabAt(1).setIcon(R.drawable.user_outline);
mainTabLayout.getTabAt(2).setIcon(R.drawable.more_black);
}
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
//no need for it
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
//no need for it
}
});
}
}
and here is ViewPagerAdapter Code:
//Adapter for mainActivity ...
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> fragmentList = new ArrayList<>();
public ViewPagerAdapter(#NonNull FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
#Override
public int getCount() {
return fragmentList.size();
}
public void addFragment(Fragment fragment) {
fragmentList.add(fragment);
}
}
and here is first Fragment Home.java Code:
public class Home extends Fragment {
View v;
public SwipeRefreshLayout mSwipeRefreshLayout;
public RecyclerView mainRecyclerView;
private LinearLayoutManager linearLayoutManager;
public final List<MyActivityModel> mainPosts = new ArrayList<>();
private PostAdapter mAdapter;
public Home() {
/*Required Empty Constructor... */
}
#Override
public View onCreateView(LayoutInflater layoutInflater, ViewGroup container, Bundle bundle) {
v = layoutInflater.inflate(R.layout.fragment_home, container, false);
mSwipeRefreshLayout = (SwipeRefreshLayout) v.findViewById(R.id.mainSwipeRefresh);
mainRecyclerView = (RecyclerView) v.findViewById(R.id.MainRecyclerView);
linearLayoutManager = new LinearLayoutManager(getActivity());
mainRecyclerView.setLayoutFrozen(true);
mainRecyclerView.setNestedScrollingEnabled(false);
mainRecyclerView.setLayoutManager(linearLayoutManager);
mAdapter = new PostAdapter(mainPosts);
mainRecyclerView.setAdapter(mAdapter);
Swipe();
LoadPosts();
return v;
}
/**
* -----------------TODO: to load posts in Home RecyclerView...----------------
*/
public void LoadPosts() {
Query database = FirebaseDatabase.getInstance().getReference().child("Posts");
database.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(#NonNull DataSnapshot snapshot, #Nullable String previousChildName) {
if (snapshot.exists()) {
MyActivityModel post = snapshot.getValue(MyActivityModel.class);
mainPosts.add(0, post);
mAdapter.notifyDataSetChanged();
}
}
#Override
public void onChildChanged(#NonNull DataSnapshot snapshot, #Nullable String previousChildName) {
}
#Override
public void onChildRemoved(#NonNull DataSnapshot snapshot) {
}
#Override
public void onChildMoved(#NonNull DataSnapshot snapshot, #Nullable String previousChildName) {
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
private void Swipe() {
//to refresh page after swipe
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
try {
mainPosts.clear();
LoadPosts();
mSwipeRefreshLayout.setRefreshing(false);
Toast.makeText(v.getContext(),"Refreshed", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
mSwipeRefreshLayout.setRefreshing(false);
}
}
}, 500);
}
});
}
}
and this is an image showing item reeating
Anyone can help me how to prevent this duplication...
You may need to use FragmentPagerAdapter instead of FragmentStatePagerAdapter. Also, set mainRecyclerView.setLayoutFrozen(true); to false because, it will stop everything in recyclerView.
When you need to use FragmentPagerAdapter?
FragmentStatePagerAdapter is more useful when there are a large number
of pages, working more like a list view. When pages are not visible to
the user, their entire fragment may be destroyed, only keeping the
saved state of that fragment. This allows the pager to hold on to
much less memory associated with each visited page as compared to
FragmentPagerAdapter at the cost of potentially more overhead when
switching between pages.
Example of FragmentPagerAdapter:
class viewpager_class extends FragmentPagerAdapter {
int tabcount;
public viewpager_class(#NonNull FragmentManager fm, int tab_count) {
super(fm, tab_count);
this.tabcount = tab_count;
}
#NonNull
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
Fragment1 fragment1 = new Fragment1 ();
return todayBAFragment;
case 1:
Fragment2 fragment2 = new Fragment2 ();
return todayReminderDue;
case 2:
Fragment3 fragment3 = new Fragment3 ();
return currentTransaction;
default:
return null;
}
}
#Override
public int getCount() {
return tabcount;
}
}
Also, set adapter into ViewPager wherever you want show viewPager:
//set adapter into viewpager
viewpager_class viewpagerClass = new viewpager_class(getChildFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(viewpagerClass);
viewPager.setOffscreenPageLimit(2);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
Not able to pass the retrived list of data from retrofit to a recyclerview in fragment!
Tried some solutions but not working!
I have tried creating methods in fragment and passing but not working!
Getting null!
Activity
TabLayout tabLayout;
ViewPager viewPager;
RecyclerView recyclerView;
//vars
private Dto dto;
List<Post_DTO> post_dto_list=new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState)
{
dto=new Dto();
UpdateList();
super.onCreate(savedInstanceState);
setContentView(R.layout.home_layout);
tabLayout=(TabLayout)findViewById(R.id.tabLayout);
viewPager=(ViewPager)findViewById(R.id.viewPager);
tabLayout.addTab(tabLayout.newTab().setText("Dashboard"));
tabLayout.addTab(tabLayout.newTab().setText("Converations"));
tabLayout.addTab(tabLayout.newTab().setText("Profile"));
PostFragment pf=new PostFragment();
pf.passData(getApplicationContext(),post_dto_list);
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
//ft.add(R.id.posts_recyclerview, ft);
ft.addToBackStack(null);
ft.commit();
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final MyAdapter adapter = new MyAdapter(this,getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
System.out.println(tab.getPosition());
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void UpdateList() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(getString(R.string.postUrl))
.addConverterFactory(GsonConverterFactory.create())
.build();
PostsInterface postsInterface =retrofit.create(PostsInterface.class);
Call<Post_DTO_Resp> call= postsInterface.getPosts();
call.enqueue(new Callback<Post_DTO_Resp>() {
#Override
public void onResponse(Call<Post_DTO_Resp> call, Response<Post_DTO_Resp> response) {
//pDialog.dismiss();
if(!response.isSuccessful())
{
Toast.makeText(getApplicationContext(),"Loading the posts!",Toast.LENGTH_SHORT).show();
}
Post_DTO_Resp posts = response.body();
post_dto_list=posts.getPost_dto_list();
//dto.setList(post_dto_list);
}
#Override
public void onFailure(Call<Post_DTO_Resp> call, Throwable t) {
//pDialog.dismiss();
if(t.getMessage().equals("End of input at line 1 column 1 path $"))
{
Toast.makeText(getApplicationContext(), "There are no posts!", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(), "Api Error!", Toast.LENGTH_LONG).show();
}
}
});
}
}
Fragment!
public class PostFragment extends Fragment {
RecyclerView recyclerView;
View v;
Dto dtobject;
private static final String DESCRIBABLE_KEY = "list";
private Describable mDescribable;
List<Post_DTO> post_dto_list;
public PostFragment() {
// Required empty public constructor
}
public void passData(Context context, List<Post_DTO> list) {
//mContext = context;
post_dto_list = list;
// mIndex = pos;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
v=inflater.inflate(R.layout.fragment_posts, container, false);
recyclerView=(RecyclerView) v.findViewById(R.id.posts_recyclerview);
RecyclerViewAdapter recyclerViewAdapter=new RecyclerViewAdapter(getContext(),post_dto_list);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(recyclerViewAdapter);
//listupdater();
return v;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
}
Just want to get the post_dto_list from Activity to fragment class!
Suggestions please!
You can use a bundle to pass a list from activity to fragment.
In activity:
Bundle bundle = new Bundle();
bundle.putSerializable("list", mList);
mFragment.setArguments(bundle);
And then in your fragment:
mList = getIntent().getExtras().getSerializable("list"));
But the POJO that your list contains should be parcelable ( Parcelable better than Serializable).
Your POJO should be something like:
public class MyPOJO implements Parcelable {
For more info refer this.
I am trying to refresh a RecyclerView by assigning a new adapter to the RecyclerView but it is throwing a NullPointerException.
I have created a TabLayout which has three tabs and when you reselect the first tab the method is called to refresh the RecyclerView. But, I am getting a NullPointerException on recyclerViewAdapter.notifyDataSetChanged();. I have initialized recyclerViewAdapter in the onCreateView(); but I still get an Exception.
EDIT :
This is a fragment not an Activity, I cannot setContentView();. Please read the question before down voting or doing anything not helpful.
Please suggest a proper way if I am doing it wrong.
Fragment which has the RecyclerView :
Tab1.class :
public class Tab1 extends Fragment {
private RecyclerView recyclerView;
private RecyclerViewAdapter recyclerViewAdapter;
private List<World> worldList;
private OnFragmentInteractionListener mListener;
private DBHelper helper;
private Context myContext;
private View view;
#Override
public void onStart() {
this.helper = new DBHelper(getContext());
recyclerViewAdapter = new RecyclerViewAdapter(getContext(), helper.getList());
super.onStart();
}
public Tab1() {
}
public void update() {
recyclerViewAdapter.notifyDataSetChanged();
}
#Override
public void onCreate(Bundle savedInstanceState) {
this.helper = new DBHelper(getContext());
this.worldList = new ArrayList<>();
this.worldList = helper.getList();
this.recyclerViewAdapter = new RecyclerViewAdapter(getContext(), this.worldList);
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_tab1, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerViewAdapter = new RecyclerViewAdapter(getContext(), worldList);
recyclerView.setAdapter(recyclerViewAdapter);
return view;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
void onFragmentInteraction(Uri uri);
}
}
The method is called from the MainActivity.class(When the Tab is re selected).
MainActivty.class :
public class MainActivity extends AppCompatActivity implements Tab1.OnFragmentInteractionListener, Tab2.OnFragmentInteractionListener, Tab3.OnFragmentInteractionListener {
DBHelper helper;
World world;
Location location;
GPSTracker tracker;
RecyclerViewAdapter adapter;
public static Context CONTEXT = null;
RecyclerView recyclerView;
public Tab1 tab1;
public static final String BROADCAST_ACTION = "e.wolverine2.thewalkingapp";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 123);
CONTEXT = getApplicationContext();
MessageReciever reciever = new MessageReciever(new Message());
Intent intent = new Intent(this, MyService.class);
intent.putExtra("reciever", reciever);
startService(intent);
tracker = new GPSTracker(getApplicationContext());
location = tracker.getLocation();
helper = new DBHelper(getApplicationContext());
tab1 = new Tab1();
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
adapter = new RecyclerViewAdapter(getApplicationContext(), helper.getList());
final TabLayout tabLayout = (TabLayout) findViewById(R.id.myTabLayout);
tabLayout.addTab(tabLayout.newTab().setText("LOCATIONS"));
tabLayout.addTab(tabLayout.newTab().setText("TOTAL DISTANCE"));
tabLayout.addTab(tabLayout.newTab().setText("CALS"));
tabLayout.getTabAt(0).setIcon(R.drawable.ic_list);
tabLayout.getTabAt(1).setIcon(R.drawable.ic_person_pin);
tabLayout.getTabAt(2).setIcon(R.drawable.ic_fitness_excercise);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
//onError();
final ViewPager viewPager = (ViewPager) findViewById(R.id.myViewPager);
final PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(pagerAdapter);
viewPager.setOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
if (tab.getPosition() == 0) {
Tab1 tab1 = new Tab1();
tab1.update();
}
}
});
}
public void locationChanged(double longi, double lati) {
final Location location = new Location("");
location.setLatitude(lati);
location.setLongitude(longi);
world = new World();
String timeStamp = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss").format(new Date());
world.setLongitude(location.getLongitude());
world.setLatitiude(location.getLatitude());
world.setDate(timeStamp);
world.setTime(timeStamp);
world.setLocation("Anonymous");
helper.addRow(world);
//tab1.update(getApplicationContext());
}
#Override
public void onFragmentInteraction(Uri uri) {
}
public class Message {
public void displayMessage(int resultCode, Bundle resultData) throws NullPointerException {
double longi = resultData.getDouble("longitude");
double lati = resultData.getDouble("latitude");
locationChanged(longi, lati);
//Toast.makeText(MainActivity.this, "TOASTY X : " + e.getMessage(), Toast.LENGTH_SHORT).show();
//Log.v("TOASTY X : ","" + e.getMessage());
}
}
public void onError() {
helper.onDropTable();
Toast.makeText(this, "TABLE DROPED!", Toast.LENGTH_SHORT).show();
}
}
Logcat :
java.lang.NullPointerException: Attempt to invoke virtual method 'void e.wolverine2.thewalkingapp.RecyclerViewAdapter.notifyDataSetChanged()' on a null object reference
at e.wolverine2.thewalkingapp.Tab1.update(Tab1.java:57)
at e.wolverine2.thewalkingapp.MainActivity$1.onTabReselected(MainActivity.java:101)
at android.support.design.widget.TabLayout.dispatchTabReselected(TabLayout.java:1177)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1136)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1128)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1427)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1537)
at android.view.View$PerformClick.run(View.java:23985)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6816)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451)
Java Tip: When it gets here:
Tab1 tab1 = new Tab1();
tab1.update();
A new Tab is instantiated using the cunstructor:
public Tab1() {
}
in your Tab class. as you see the recyclerView is not initialized up to this point.So the recyclerView is actually Null!
Answer: To correctly implement fragment take a look at this:
https://stackoverflow.com/a/5161143/6094503
What you looking for is the following lines:
Fragment newFragment = new DebugExampleTwoFragment();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(CONTENT_VIEW_ID, newFragment).commit();
but I think you need more study about fragments and how they're added to (or removed from) an activity
I have an activity who load a list of data, this activity its a TabActivity with 3 Tabs, all tabs load a diferent data type.
But the data may be really a bunch of data, for that reason my activity may take a lot of time to show itself.
I start teh activity using
Intent intent = new Intent(MainActivity.this, PcapAnalisys.class);
startActivity(intent);
Then, when the activity is loading shows a black screen, and after a few seconds show the content properly.
There is a way on how to show a message like: "Loading activity... please wait" or something?
This is my code for a my TabActivity:
public class PcapAnalysis extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
private TabLayout tabLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pcap_analysis);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mViewPager = (ViewPager) findViewById(R.id.container);
tabLayout = (TabLayout) findViewById(R.id.tabs);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
//fab.setImageResource(R.drawable.ic_attach_file_white_24dp);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FileChooserDialog dialog = new FileChooserDialog(PcapAnalysis.this);
dialog.show();
dialog.addListener(new FileChooserDialog.OnFileSelectedListener() {
#Override
public void onFileSelected(Dialog source, File file) {
source.hide();
Toast.makeText(source.getContext(),
"File selected: " + file.getAbsolutePath(),
Toast.LENGTH_LONG).show();
Log.i("Archivo seleccionado", file.getAbsolutePath());
new AsyncTask_load(PcapAnalysis.this, file.getAbsolutePath()).execute();
}
public void onFileSelected(Dialog source, File folder, String name) {
source.hide();
Toast.makeText(source.getContext(),
"File created: " + folder.getName() + "/" + name,
Toast.LENGTH_LONG).show();
}
});
}
});
new Task().execute();
}
#Override
public void recreate()
{
super.recreate();
}
#Override
public boolean onSupportNavigateUp() {
onBackPressed();
return false;
}
#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_pcap_analysis, 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 PlaceholderFragment extends 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_pcap_analysis, 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;
}
}*/
private class Task extends AsyncTask<Void, Integer, Void> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
pDialog = new ProgressDialog(PcapAnalysis.this);
pDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pDialog.setMessage("Procesando...");
pDialog.setCancelable(true);
pDialog.setMax(100);
pDialog.setCanceledOnTouchOutside(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... voids) {
// 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.setOffscreenPageLimit(3); //cuantas paginas se precargan
mViewPager.setAdapter(mSectionsPagerAdapter);
tabLayout.setupWithViewPager(mViewPager);
//publishProgress(progress);
return null;
}
#Override
protected void onProgressUpdate(Integer... values) {
}
#Override
protected void onPostExecute(Void result) {
pDialog.dismiss();
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private Fragment http = new HttpList();
private Fragment dns = new DnsList();
private Fragment ip = new IpList();
private Fragment resume = new ResumeList();
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);
switch (position) {
case 0:
return http;
case 1:
return dns;
case 2:
return ip;
case 3:
return resume;
}
return null;
}
#Override
public int getCount() {
return 4;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "HTTP";
case 1:
return "DNS";
case 2:
return "RESOURCE IP";
case 3:
return "RESUME";
}
return null;
}
}
}
As you can see this activity use fragments to show the data, and each fragment has a for cicle to load the data (that is in a String array).
Also I use a AsyncTask trying to solve this problem, but is not working. Please help!
in my app i have a Tabs with fragment classes. i trying to refresh listView in "fragment a" with the new data i insert.
In "fragment b" i have EditText and Button ,that inserting text to the database.
in "fragment a" i have the ListView with the dataBase rows. when "fragment a" is "OnCreateView" i just put the dataBase on a "ArrayList" and past it to my baseAdapter.
but "onCreateView" not refreshing my new data every time i get into the "fragment a" else i goes to "fragment c" and "onDestroy" call on "fragment a".
so my result it was to call : "setUserVisibleHint" override method, and check if it is visible and refreshing the list.
but i dont think it is the good practice .
what should i do?
Class a
public class ListFragment extends Fragment{
basAdapterCustom adapter;
ListView lv;
ArrayList<Clock> list;
private DbHandler hand;
Context context;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.list_fragment, container, false);
context = getActivity();
Log.d(TAG, "onCreateView");
hand = new DbHandler(context);
list = new ArrayList<Clock>();
lv = (ListView) v.findViewById(R.id.listOfShifts);
adapter = new basAdapterCustom(list, getActivity());
lv.setAdapter(adapter);
refreshList();
return v;
}
//like on "resume":
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
// Make sure that we are currently visible
if (this.isVisible()) {
refreshList();
if (!isVisibleToUser) {
// TODO stop
}
}
}
private void refreshList() {
list = hand.getByWorkName();
adapter = new basAdapterCustom(list,getActivity());
lv.setAdapter(adapter);
}
class b:
public class ClockFragment extends Fragment{
DbHandler hand;
Context context;
#Override
public View onCreateView(LayoutInflater inflater,
#Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.clock, container,false);
context = getActivity();
hand = new DbHandler(context);
return v;
}
// ADD to .Db
public void addToDb(View v){
hand.add(new Clock(0, dateDay));
}
}
class mainActivity:
public class MainActivity extends FragmentActivity implements ActionBar.TabListener, OnPageChangeListener{
public static final String TAG = "myClock";
String[] tabMenu = {"FRAG A","FRAG B","FRAG C"};
private ViewPager viewPager;
private TabPagerAdapter mAdapter;
private ActionBar actionBar;
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(MainActivity.TAG, "OnCreate = MainActivity (Pager");
viewPager = (ViewPager) findViewById(R.id.pager );
actionBar = getActionBar();
mAdapter = new TabPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
for (String tabsNames : tabMenu) {
actionBar.addTab(actionBar.newTab().setText(tabsNames).setTabListener(this));
}
viewPager.setOnPageChangeListener(this);
}
// public void transDialog(){
// Dialog mDialog = new Dialog(this, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen);
// }
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
}
PagetAdapter.class
public class TabPagerAdapter extends FragmentPagerAdapter {
private static final String TAG = "myClock";
public TabPagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
#Override
public Fragment getItem(int index) {
Log.d(TAG, " CLASS : TabPagerAdapter");
switch (index) {
case 0:
return new ListFragment();
case 1:
return new ClockFragment();
case 2:
return new SettingFragment();
default:
break;
}
Log.d(TAG, " CLASS : TabPagerAdapter = "+index);
return null;
}
#Override
public int getCount() {
return 3;
}
}
Please help me i hope you are understand my problem...
You want to update listView in fragment A, after insert data in fragment b? Then you have a few solutions to choose:
1. Implement communications between fragments via activity. Then B insert date, it send message to activity, that data need to be updated. Then fragment A started, it's ask activity to need update data. For details on implementing this communication check link.
2. Use some bus library, EventBus for example. Then fragment B insert data, it post 'data changed' event to bus. Fragment A checks on start if this event occurs.
3. Use Loaders which "monitor the source of their data and deliver new results when the content changes."