Develop Reference

Moving Data from Activity to Another Activity's TabFragment's Fragment

I want to move some data from my Mainactivity to a Fragment...which is inside a tab fragment (which handles a SectionPagerAdapter)....which is inside a fragment in Mainactivity2.
I feel its too complicated and cant get it done.
GameEndedActivity (See wrong and correct variable...these are to be transferred)
public class GameEndedActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_ended);
int correct = getIntent().getIntExtra("correct", 0);
int wrong = getIntent().getIntExtra("wrong", 0);
}
}
TabFragment
public class TabFragment extends Fragment {
private int tabsCount;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_tab, container, false);
if(this.getContext() instanceof ChallengeOverviewActivity){
tabsCount = 2;
} else {
tabsCount = 3;
}
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this.getContext(), getFragmentManager(), tabsCount);
ViewPager viewPager = view.findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = view.findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
return view;
}
}
ResultFragment (Transfer data here - wrong and correct variables)
public class ResultDetailsFragment extends Fragment {
private TextView tvWrong, tvCorrect;
private AnswerListener answerListener;
public interface AnswerListener {
public void correct(int i);
public void wrong(int i);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_result_details, container, false);
tvCorrect = view.findViewById(R.id.tvCorrect);
tvWrong = view.findViewById(R.id.tvWrong);
return view;
}
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
if (context != null) {
answerListener = (AnswerListener) context;
}
}
}

One way to do this is the add arguments to the fragment when you create an instance of it. In your activity when you create the fragment you want to attach you add some arguments to it. These arguments can then be accessed from the fragments onCreate method.
Just do this same thing again when you are in your fragment and create your second one.
Check this answer out which explains more in detail how to do it: https://stackoverflow.com/a/17436739/964887

Android pass View as an object to fragment

I'm more googling to find how can i pass simple view as an object to fragment, but i can't.
for example in MainActivity i have simple view as :
TextView text = (TextView) findviewById(R.id.tv_text);
now i want to pass that to fragment. this below code is my attach Fragment on MainActivity
MainActivity :
public void attachFragment() {
fts = getActivity().getFragmentManager().beginTransaction();
mFragment = new FragmentMarketDetail();
fts.replace(R.id.cardsLine, mFragment, "FragmentMarketDetail");
fts.commit();
}
and this is my Fragment:
public class FragmentMarketDetail extends Fragment implements ObservableScrollViewCallbacks {
public static final String SCROLLVIEW_STATE = "scrollviewState";
private ObservableScrollView scrollViewTest;
private Context context;
private int scrollY;
public static FragmentMarketDetail newInstance() {
FragmentMarketDetail fragmentFirst = new FragmentMarketDetail();
return fragmentFirst;
}
#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.fragment_online_categories, container, false);
scrollViewTest = (ObservableScrollView) view.findViewById(R.id.scrollViewTest);
scrollViewTest.setScrollViewCallbacks(this);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = getActivity().getBaseContext();
}
}

It wouldn't be good practise to pass a view that way. If you want to access the view in your activity from within your fragment class, use getActivity() to access the activity to which your fragment is attached, and from there you find your TextView.
TextView text = (TextView) getActivity().findViewById(R.id.tv_text);

How about adding a set function in your custom fragment
e.g.
public void setTextView(TextView tv){
this.tv = tv
}
and then calling it after
mFragment = new FragmentMarketDetail();
mFragment.setTextView(textView)

Find fragment by tag and invoke a function on it:
mFragment = (FragmentMarketDetail ) getActivity().getFragmentManager().findFragmentByTag(FragmentMarketDetail .class.getSimpleName());
mFragment.passTextView(textView);
Of course fragment must be added to backstack.

Notify from child fragment inside ViewPager to his parent an event

i have a fragment inside a activity, this fragment contains a viewpager, this is the code:
public class RepliesContainerFragment extends Fragment {
#InjectView(R.id.viewPager)
ViewPager pager;
private PagerAdapter adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ReplyActivity replyActivity = (ReplyActivity) getActivity();
List<Replie> replies = getArguments().getParcelableArrayList("replies");
adapter = new PagerAdapter(replyActivity.getSupportFragmentManager(), replies);
setActionBar();
}
private void setActionBar() {
getActivity().getActionBar().setDisplayHomeAsUpEnabled(false);
getActivity().getActionBar().setIcon(getResources().getDrawable(R.drawable.ic_back));
getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
getActivity().getActionBar().setTitle("Respuestas");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.work_containter_replies, container, false);
ButterKnife.inject(this, view);
pager.setAdapter(adapter);
return view;
}
}
Inside the adapter i had instantiate some fragments like this:
public class ReplyFragment extends Fragment {
#InjectView(R.id.tvQuestion)
TextView tvQuestion;
#InjectView(R.id.frameContainter)
FrameLayout replyContainer;
private ReplyView replyView;
private String question;
private String currentReplie;
private int replieType;
private int questionId;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
replieType = getArguments().getInt("replyType");
question = getArguments().getString("question");
questionId = getArguments().getInt("questionId");
currentReplie = getArguments().getString("currentReplie");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.work_reply_fragment, container, false);
ButterKnife.inject(this, view);
initQuestionText();
return view;
}
private void persistReply() {
ReplyActivity replyActivity = (ReplyActivity) getActivity();
if (replyActivity != null) {
//DO SOMETHING
//Notify to adapter from here
}
}
}
}
As you can see, i want to notify to my RepliesContainerFragment and his inside adapter that some event happens and do an action..
How can i do it this?
With broadcastreceivers, with callbacks(Interfaces)..?I am not sure.

The very simple solution for this is to pass a listener instance from your parent fragment to a child fragment. You have to create a listener interface, create an instance of it in your parent fragment, and pass that instance to all your children fragments.
By the way there is a topic regarding this problem in the official tutorial.
Hope this helps.

I think it is easier:
private void persistReply() {
ReplyActivity replyActivity = (ReplyActivity) getActivity();
if (replyActivity != null) {
//DO SOMETHING
RepliesContainerFragment frag = ((RepliesContainerFragment)this.getParentFragment());
frag.getAdapter().notifyDataSetChanged();
}
}
}
and make getter setter for adapter

FragmentTabHost does not have the nested fragments in onTabChanged, why? How can I do?

I'm doing a small app with FragmentTabHost and two nested fragments. I need update the data of nested fragments from the fragment that contains the FragmentTabHost but for any reason I don't have the second fragment (second tab) when I do click in its tab then I get a null pointer exception.
Here it is a test of my code:
TabsTransactionFragment.java, this is the Fragment that contain the FragmentTabHost
public class TabsTransactionFragment extends Fragment implements
OnTabChangeListener{
private static final String TAB_ONE_TAG = "ONE";
private static final String TAB_TWO_TAG = "TW0";
private FragmentTabHost mTabHost;
private ArrayList<Integer> mData;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mData = new ArrayList<Integer>();
for (int i=0; i<10; i++) {
mData.add(i);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_tabs_transations,
container, false);
mTabHost = (FragmentTabHost) view.findViewById(android.R.id.tabhost);
mTabHost.setup(getActivity(), getChildFragmentManager(),
android.R.id.tabcontent);
mTabHost.addTab(
mTabHost.newTabSpec(TAB_ONE_TAG).setIndicator(
"ODD"),
ListDataFragment.class, null);
mTabHost.addTab(
mTabHost.newTabSpec(TAB_TWO_TAG).setIndicator(
"EVEN"),
ListDataFragment.class, null);
mTabHost.setOnTabChangedListener(this);
return mTabHost;
}
#Override
public void onDestroyView() {
super.onDestroyView();
mTabHost = null;
}
private void updateDataChildFragments(String tabName) {
if (mData != null) {
ListDataFragment listOneFragment =
(ListDataFragment) getChildFragmentManager().findFragmentByTag(TAB_ONE_TAG);
ListDataFragment listTwoFragment =
(ListDataFragment) getChildFragmentManager().findFragmentByTag(TAB_TWO_TAG);
if (tabName.equalsIgnoreCase(TAB_ONE_TAG)) {
ArrayList<Integer> odds = new ArrayList<Integer>();
for (int i=0; i<mData.size(); i++) {
if (mData.get(i) % 2 != 0) {
odds.add(mData.get(i));
}
}
listOneFragment.updateData(odds);
} else {
ArrayList<Integer> even = new ArrayList<Integer>();
for (int i=0; i<mData.size(); i++) {
if (mData.get(i) % 2 != 0) {
even.add(mData.get(i));
}
}
// Fragment two is null then crash...
listTwoFragment.updateData(even);
}
}
}
#Override
public void onTabChanged(String tabName) {
updateDataChildFragments(tabName);
}
}
Each tab contains a simple ListFragment like this:
public class ListDataFragment extends ListFragment {
private ArrayAdapter<Integer> mAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new ArrayAdapter<Integer>(getActivity(), android.R.layout.simple_list_item_1);
setListAdapter(mAdapter);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent,
Bundle savedInstanceState) {
return super.onCreateView(inflater, parent, savedInstanceState);
}
public void updateData(ArrayList<Integer> data) {
mAdapter.addAll(data);
mAdapter.notifyDataSetChanged();
}
}
And layout fragment_tabs_transations.xml is the structure of android.support.v4.app.FragmentTabHost with a linearLayout, TabWidget and FrameLayout.
I have tried many things and ways but I haven't got to pass data to the second fragment once I do click... I have tried to created first both fragment and add to FragmentTabHost but I didn't get neither...
I think the problem it is the second fragment it is attached to FragmentTabHost after onTagChanged and that is because I can not find it... But I don't understand this behaviour... :S.
Anybody can help me? Or know any solution to pass data to second Fragment before do click in its tab?
Many thanks!!

Android: Can't load tab. Says child already has a parent

I have the following FragmentActivity:
public class TabsActivity extends FragmentActivity {
private FragmentTabHost mTabHost;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tabs);
mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
mTabHost.addTab(mTabHost.newTabSpec("Home").setIndicator("Home", getResources().getDrawable(R.drawable.hometab)),HomeTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Explore").setIndicator("Explore", getResources().getDrawable(R.drawable.exploretab)),ExploreTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Info").setIndicator("Info", getResources().getDrawable(R.drawable.infotab)),InfoTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Social").setIndicator("Social", getResources().getDrawable(R.drawable.socialtab)),SocialTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Contact").setIndicator("Contact", getResources().getDrawable(R.drawable.contacttab)),ContactTab.class, null);
TabWidget tabWidget = mTabHost.getTabWidget();
tabWidget.setStripEnabled(false);
for(int i=0; i < tabWidget.getChildCount(); i++){
tabWidget.getChildAt(i).setBackgroundResource(R.drawable.tab_bg);
TextView tv = (TextView)tabWidget.getChildAt(i).findViewById(android.R.id.title);
tv.setTextColor(this.getResources().getColor(R.color.white));
}
mTabHost.setOnTabChangedListener(new OnTabChangeListener() {
#Override
public void onTabChanged(String tabId) {
Log.d("PAUL",tabId);
if(tabId=="Home"){
finish();
}
TabWidget tw = mTabHost.getTabWidget();
for(int i=0; i < tw.getChildCount(); i++){
TextView tabText = (TextView)tw.getChildAt(i).findViewById(android.R.id.title);
if(tabText.getText()==tabId){
tabText.setTextColor(TabsActivity.this.getResources().getColor(R.color.tcmgreen));
} else {
tabText.setTextColor(TabsActivity.this.getResources().getColor(R.color.white));
}
}
}
});
Intent intent = getIntent();
String tag = intent.getStringExtra("tab");
Log.d("DEBUG",tag);
mTabHost.setCurrentTabByTag(tag);
}
}
When the user taps the 'Explore' tab I get the following error: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. Here is my ExploreTab class:
public class ExploreTab extends Fragment {
private ArrayList<Level> levels;
private TCMSQLiteHelper sqliteHelper;
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
sqliteHelper = new TCMSQLiteHelper(this.getActivity());
levels = sqliteHelper.getAllLevels();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d("DEBUG","Explore Created");
View v = inflater.inflate(R.layout.explorelist, container);
return v;
}
}
This doesn't make any sense to me because I don't see where there could be a problem of a view already being loaded. What am I missing here?

In onCreateView(), you should be passing in a third parameter, false. This third parameter specifies whether the layout should attached itself to the ViewGroup container.
From the Fragments documentation:
In this case, this is false because the system is already inserting the inflated layout into the container—passing true would create a redundant view group in the final layout.
Thus your code should be:
View v = inflater.inflate(R.layout.explorelist, container, false);