I am new to Android.Its my first application.I have tried searching on Internet but everyone tried to pass simple data from activity to fragment.I want to pass an whole object from activity to fragment.
I know there is one solution around is just use serialize & de-serialize & put the data in Bundle.
Instead trying serialize & deserialize,I created a non-static method in my activity & trying to getActivity() in fragment & then calling that method but it returns me null.Can anybody help me with what I am doing wrong.
Below is my code:-
BaseDefaultActivity is my own customized class which extends AppCompatActivity.
public class EventDetailActivity extends BaseDefaultActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setBaseContentView(R.layout.activity_event_detail);
ButterKnife.bind(this);
initialiseDataFromIntend();
DummyObject obj=new DummyObj();
setDataObject(obj);
// Get the ViewPager and set it's PagerAdapter so that it can display items
viewPager.setAdapter(new EventDetailFragementAdapter(getSupportFragmentManager(), EventDetailActivity.this));
// Give the TabLayout the ViewPager
tabLayout.setupWithViewPager(viewPager);
}
}
public class BaseDefaultActivity extends AppCompatActivity implements BaseActivity {
private Object dataObj;
public void setDataObject(Object obj) {
this.dataObj = obj;
}
public Object getDataObj() {
return this.dataObj;
}
}
public class EventDetailFragementAdapter extends FragmentPagerAdapter {
final int PAGE_COUNT = 3;
private String tabTitles[] = new String[]{"Tab1", "Tab2", "Tab3"};
private Context context;
public EventDetailFragementAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
#Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = new EventDetailFragement();
break;
case 1:
fragment = new EventBasicInfoFragement();
break;
default:
fragment = new EventDetailFragement();
break;
}
return fragment;
}
#Override
public int getCount() {
return PAGE_COUNT;
}
public class EventDetailFragement extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.event_detail_fragement, container, false);
TextView textView = (TextView) view;
textView.setText("AAAAAAA #" + (SearchEventResponseObject) ((BaseDefaultActivity) getActivity()).getDataObj());
return view;
}
}
Related
Activity
public class GroupesActivity extends BaseActivity {
SelectedBundle selectedBundle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_groupes);
sectionsPagerAdapter = new GroupPagerAdapter(this, getSupportFragmentManager());
viewPager.setAdapter(sectionsPagerAdapter);
tabs.setupWithViewPager(viewPager);
}
private void getAllGroup() {
// api call retrive data
// send data using interface on response
// set data selectedBundle.onBundleSelect(isVisible,calanderModelList,groupModelList,eventModelList);
}
public void setOnBundleSelected(SelectedBundle selectedBundle) {
this.selectedBundle = selectedBundle;
}
public interface SelectedBundle {
void onBundleSelect(boolean isVisible, List<CalanderModel> calanderModelList, List<GroupModel> groupModelList, List<EventModel> eventModelList);
}
}
Frgment
public class FragmentOne extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View root = inflater.inflate(R.layout.fragment_all_groups_fragments, container, false);
// get data only once on oncreateview
((GroupesActivity) getActivity()).setOnBundleSelected(new GroupesActivity.SelectedBundle() {
#Override
public void onBundleSelect(boolean isVisible, List<CalanderModel> calanderModelListtt, List<GroupModel> groupModelList, List<EventModel> eventModelList) {
Log.e("retrive data","data")
}
});
return root;
}
}
GroupPagerAdapter
public class GroupPagerAdapter extends FragmentPagerAdapter {
#StringRes
private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2, R.string.tab_text_3};
private final Context mContext;
public GroupPagerAdapter(Context context, FragmentManager fm) {
super( fm);
this.mContext=context;
}
#NonNull
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new AllGroupsFragments();
case 1:
return new HostFragments();
case 2:
return new GuestFragments();
}
return null;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return mContext.getResources().getString(TAB_TITLES[position]);
}
#Override
public int getCount() {
return 3;
}
}
problem
i have three fragments in tabview when i swipe this obove fragment
and then come again in this fragmnet that interface not called and i'm
not getting data from activity
How to get that data again from its parent activity, i need to only
retrive that data from activity on each time of fragments oncreateView
Thanks in adavance ;)
Use setMenuVisibility() method in Fragment to fix the issue.
//In fragments
#Override
public void setMenuVisibility(final boolean isVisible) {
super.setMenuVisibility(isVisible);
if (isVisible) {
//visible to user- do ur stuff
((GroupesActivity) getActivity()).setOnBundleSelected(new
GroupesActivity.SelectedBundle() {
#Override
public void onBundleSelect(boolean isVisible, List<CalanderModel>
calanderModelListtt, List<GroupModel> groupModelList, List<EventModel>
eventModelList) {
Log.e("retrive data","data")
}
});
}
}
the following link may help if you face any issues:
How to determine when Fragment becomes visible in ViewPager
I'm creating an app with vertical page adapter using FragmentStatePagerAdapter. The big issue i'm facing is, data is not displayed on the textview on first app launch but is displayed on scrolling the page. I believe the fragment view is delaying to create textview because, on my LoadAlbumDataCompleted() function inside Fragmentone.class, i'm able to print the data returned or also output via toast but is not getting populated to the textview.
Kindly help.
MainActivity.class
public class MainActivity extends FragmentActivity implements LoadAalbumsTotalListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new MainActivityVSlideAdapter(this, getSupportFragmentManager(), NUMBER_OF_PAGES);
mPager.setAdapter(mAdapter);
LoadTotalAlbumsNum.BindAlbumsTotalListener(this);
}
#Override
public void OnLoadAlbumsCompleted(String total) {
if(total.trim().equalsIgnoreCase("")){
NUMBER_OF_PAGES=0;
}else{
NUMBER_OF_PAGES=Integer.parseInt(total.trim());
}
mAdapter = new MainActivityVSlideAdapter(this, getSupportFragmentManager(), NUMBER_OF_PAGES);
mPager.setAdapter(mAdapter);
}
}
MainActivityVSlideAdapter.class Adapter
public class MainActivityVSlideAdapter extends FragmentStatePagerAdapter {
static int NUMBER_OF_PAGES;
private Context con;
public MainActivityVSlideAdapter(Context con, FragmentManager fm, int NUMBER_OF_PAGES) {
super(fm);
this.con=con;
this.NUMBER_OF_PAGES=NUMBER_OF_PAGES;
}
#Override
public int getCount() {
return NUMBER_OF_PAGES;
}
#Override
public Fragment getItem(int position) {
return FragmentOne.newInstance(position);
}
}
Fragmentone.class
public class FragmentOne extends Fragment implements LoadAlbumDataListener {
private static final String MY_NUM_KEY = "num";
private int mNum;
private TextView SaloonName;
private TextView location;
// You can modify the parameters to pass in whatever you want
public static FragmentOne newInstance(int num) {
FragmentOne f = new FragmentOne();
Bundle args = new Bundle();
args.putInt(MY_NUM_KEY, num);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//get argument from
mNum = getArguments() != null ? getArguments().getInt(MY_NUM_KEY) : 0;
session=new Session(getActivity());
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_one, container, false);
Methods methods=new Methods(getActivity());
// v.setBackgroundColor(mColor);
SaloonName = v.findViewById(R.id.SaloonName);
location=v.findViewById(R.id.location);
new LoadAlbumData(getActivity()).execute(getString(R.string.urlAddress)+"load-album-data.php", String.valueOf(mNum));
LoadAlbumData.BindLoadAlbumDataListener(this);
return v;
}
#Override
public void LoadAlbumDataCompleted(String s) {
JSONArray jsonPicsArray = null;
JSONObject jsonObj;
String BusinessLocation=null;
try {
jsonPicsArray = new JSONArray(s);
businessName = jsonObj.getString("businessName");
BusinessLocation = jsonObj.getString("location");;
}
Toast.makeText(getActivity(), businessName, Toast.LENGTH_LONG).show();
SaloonName.setText(businessName);
location.setText(BusinessLocation);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
From your code, it looks like, you are not setting the LoadAlbumDataListener correctly. Instead of statically setting the listener. Pass reference in constructor of your LoadAlbumData Asynctask
remove this line
LoadAlbumData.BindLoadAlbumDataListener(this);
replace
new LoadAlbumData(getActivity()).execute(getString(R.string.urlAddress)+"load-album-data.php", String.valueOf(mNum));
with
new LoadAlbumData(getActivity(), this).execute(getString(R.string.urlAddress)+"load-album-data.php", String.valueOf(mNum));
Modify your asynctask to have reference of LoadAlbumDataListener
Also as a good practice, never store strong reference of activity or fragment in your asynctask. Use WeakReference.
I have a Fragment with a TableLayout. The data in the table is from a SQLite db. The SQLite db is populated from a RESTful webservice in an AsyncTask in the MainActivity. The Fragment must wait for the task to complete before populating the table. The Fragment listens for the task onPostExecute() method to be called. When it is, the method onLoadAndStoreComplete in the Fragment is called. This all works.
What doesn't work is that I need the fragment activity in order to create new TableRows and TextViews in onLoadAndStoreComplete and I can't get it.
I've tried:
- making a class member fragmentActivity and assigning in onCreateView(), but by the time it gets to onLoadAndStoreComplete(), it is null.
- calling this.getActivity() again in onLoadAndStoreComplete(), but it returns null.
How do I get the fragment activity?
MyFragment.java:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
fragmentActivity = this.getActivity(); // return value is valid
...
}
#Override
public void onLoadAndStoreComplete() {
fragmentActivity = this.getActivity(); // returns null
...
}
from MainActivity.java (extends ActionBarActivity)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mainActivity = this;
setContentView(R.layout.activity_main);
Resources resources = getResources();
String[] tabTitleArray = { resources.getString(R.string.first_fragment),
resources.getString(R.string.second_fragment),
resources.getString(R.string.help_fragment) };
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getSupportActionBar();
mAdapter = new TabsPagerAdapter(this.getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
for (String tab_name : tabTitleArray) {
actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this));
}
// On swiping the ViewPager, select the respective tab
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position) ;// on changing the page, make respected tab selected
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
});
String url = "http://myrestfulwebservice";
Fragment secondFragment = mAdapter.getItem(SECOND_TAB);
new LoadAndStoreDataTask((OnLoadAndStoreCompleteListener)secondFragment).execute(url);
}
} // end OnCreate
TabsPagerAdapter.java
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
case 2:
return new HelpFragment();
}
return null;
}
#Override
public int getCount() {
return 3; // get item count - equal to number of tabs
}
public static void setTabColor(TabHost tabhost) {
for(int i=0;i<tabhost.getTabWidget().getChildCount();i++) {
tabhost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#FF0000")); //unselected
}
tabhost.getTabWidget().getChildAt(tabhost.getCurrentTab()).setBackgroundColor(Color.parseColor("#0000FF")); // selected
}
}
I haven't tested this, but it seems to me that it would work.
Add a Context parameter to the constructor for both TabsPagerAdapter and MyFragment.
Something like this:
TabsPagerAdapter.java:
public class TabsPagerAdapter extends FragmentPagerAdapter {
private Context mCtx;
public TabsPagerAdapter(FragmentManager fragmentManager, Context context) {
super(fragmentManager);
mCtx = context;
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new FirstFragment(mCtx);
case 1:
return new SecondFragment(mCtx);
case 2:
return new HelpFragment(mCtx);
}
return null;
}
#Override
public int getCount() {
return 3; // get item count - equal to number of tabs
}
public static void setTabColor(TabHost tabhost) {
for(int i=0;i<tabhost.getTabWidget().getChildCount();i++) {
tabhost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#FF0000")); //unselected
}
tabhost.getTabWidget().getChildAt(tabhost.getCurrentTab()).setBackgroundColor(Color.parseColor("#0000FF")); // selected
}
}
MainActivity.java:
mAdapter = new TabsPagerAdapter(this.getSupportFragmentManager(), this);
MyFragment.java (do this in FirstFragment, SecondFragment, and HelpFragment):
public static class MyFragment extends Fragment {
private Context fragmentActivity ;
public MyFragment(Context context){
fragmentActivity = context;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//.........
return rootView;
}
#Override
public void onLoadAndStoreComplete() {
//do something with fragmentActivity
}
}
It seems the AsyncTask starts too early. suggest loading the db in onActivityCreated(), it's be called after onCreateView
#Override
public void onActivityCreated (Bundle savedInstanceState) {
//load your db here
}
I have a FragmentActivity that uses a ViewPager to flip left and right through pages of data (two ListFragments).
public class StopsActivity extends FragmentActivity {
private ViewPager mViewPager;
private PagerTabStrip mPagerTabStrip;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stops);
mPagerTabStrip =(PagerTabStrip)findViewById(R.id.pager_header);
mViewPager = (ViewPager)findViewById(R.id.pager);
mPagerTabStrip.setDrawFullUnderline(true);
mPagerTabStrip.setTabIndicatorColorResource(R.color.pagerTabStrip);
mViewPager.setAdapter(new StopsAdapter(getSupportFragmentManager()));
mViewPager.setCurrentItem(0);
}
private class StopsAdapter extends FragmentPagerAdapter {
public StopsAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return StopsFragment.newInstance(routename, Stop.FORWARD);
case 1:
return StopsFragment.newInstance(routename, Stop.BACKWARD);
}
return null;
}
#Override
public int getCount() { return 2;}
#Override
public CharSequence getPageTitle(int position) { /* implementation ... */}
}
}
Everything runs ok, but I think that the instantation of the second StopFragment invalidate the data of the first one when getItem is called.
public class StopsFragment extends ListFragment {
private StopsAdapter mStopsAdapter;
private ListView mListView;
private String routename;
private int direction;
public static StopsFragment newInstance(String routename, int direction) {
StopsFragment stopsFragment = new StopsFragment();
// Supply arguments
Bundle args = new Bundle();
args.putString("routename", routename);
args.putInt("direction", direction);
stopsFragment.setArguments(args);
return stopsFragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Setup the adapter
ArrayList<Stop> stops = ...
mStopsAdapter = new StopsAdapter(getActivity(), stops);
setRetainInstance(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle inState) {
View rootView = inflater.inflate(R.layout.fragment_stops, container, false);
// Attach the adapter
mListView = (ListView) rootView.findViewById(android.R.id.list);
mListView.setAdapter(mStopsAdapter);
return rootView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
The page "IDA" corresponds to StopFragment with argument Stop.FORWARD and the page "VUELTA" corresponds the StopFragment with argument Stop.BACKWARD. As you can see in the images below, just one of them (the last one instantiate) is populated:
What I'm doing wrong?
EDIT
This is StopsAdapter
class StopsAdapter extends BaseAdapter {
private ArrayList<Stop> stops;
private LayoutInflater inflater;
public StopsAdapter(Context context, ArrayList<Stop> stops) {
this.stops = stops;
this.inflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return stops.size();
}
#Override
public Object getItem(int position) {
return stops.get(position);
}
#Override
public long getItemId(int position) {
return (long)position;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.item_stop, parent, false);
}
TextView name = (TextView)convertView.findViewById(R.id.tvStopName);
TextView description = (TextView)convertView.findViewById(R.id.tvStopDescription);
Stop stop = (Stop)getItem(position);
name.setText(stop.name);
if (stop.info != null) {
description.setText(stop.info);
}
return convertView;
}
}
Ok, my fault. The code that was giving me problems is the only that I haven't posted (ArrayList<Stop> stops = ...). The code about Fragments and ViewPager works correctly.
I have a viewpager with 2 pages, on each fragment i put a button to switching fragment,
but if i change orientation switching doesn't work.
For switching fragment I using my OnChangePageButtonClick interface
Why is this happening?
ViewPager Activity:
public class ViewPagerMusic extends FragmentActivity implements OnChangePageButtonClick {
private ViewPager vp;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_pager_music);
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(super.getSupportFragmentManager(), fragments);
vp = (ViewPager)findViewById(R.id.viewpager);
vp.setAdapter(viewPagerAdapter);
}
private class ViewPagerAdapter extends FragmentStatePagerAdapter {
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch(position) {
case 0:
MainPage mainPage = new MainPage();
mainPage.setOnChengeButtonListener(ViewPagerMusic.this);
return mainPage;
case 1:
PlaylistPage playlistPage = new PlaylistPage();
playlistPage.setOnChengeButtonListener(ViewPagerMusic.this);
return playlistPage;
}
return null;
}
#Override
public int getCount() {
return 2;
}
}
#Override
public void selectPage(int page) {
vp.setCurrentItem(page);
}
}
my Frgamnets:
public class MainPage extends Fragment {
public MainPage() {
setRetainInstance(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.music_main_page, container, false);
ImageButton btnPlaylist = (ImageButton)v.findViewById(R.id.btnGoPlaylist2);
btnPlaylist.setOnClickListener(onButtonListener);
return v;
}
private OnClickListener onButtonListener = new OnClickListener() {
#Override
public void onClick(View view) {
onChangePageButtonClick.selectPage(1);
}
};
public void setOnBackButtonListener(OnChangePageButtonClick onChangePageButtonClick) {
this.onChangePageButtonClick = onChangePageButtonClick;
}
private OnChangePageButtonClick onChangePageButtonClick;
}
Playlist fragment is similar to MainPage fragment.
Your fragments are storing a reference to the ViewPagerMusic activity. However, after rotation, the activity is destroyed and recreated, so the fragments now contain a reference to the old activity.
Instead of storing a reference to the activity, you can call the activity's method from the fragment like this:
((ViewPagerMusic) getActivity()).selectPage(1);
just create this method in your view pager
#Override
public void selectPage(int page) {
vp.setCurrentItem(page);
}
and then call this in your onclick method
((ViewPagerMusic) getActivity()).selectPage(1);