Back doesn't work in inner fragment

Back doesn't work in inner fragment - android

There is an activity in which there is a fragment, let's call it FirstFragment. There is a framelayout in this fragment containing another fragment, SecondFragment. By clicking on SecondFragment, ThirdFragment is fired. Here, I need to be able to go back to the SecondFragment when pressing back button. However, by clicking on back button, the activity is closed. Here's my code :
MainActivity.java
public class MainActivity extends AppCompatActivity{
ViewPager viewPager;
String[] titles;
SecondFragment secondFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentPagerAdapter fragment = new FragmentPagerAdapter(getSupportFragmentManager());
viewPager = findViewById(R.id.viewPager);
viewPager.setAdapter(fragment);
firstFragment = new FirstFragment();
}
public class FragmentPagerAdapter extends android.support.v4.app.FragmentPagerAdapter {
public FragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0 : return FirstFragment.newInstance("hi");
default: return new OtherFragment();
}
}
#Override
public int getCount() {
return 3;
}
}
#Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() > 0) {
getFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
}
FirstFragment.java
public class FirstFragment extends Fragment implements RecyclerViewListener {
public FirstFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
Fragment secondFragment =SecondFragment.newInstance("hi");
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.replace(R.id.frameLayout, secondFragment).commit();
return inflater.inflate(R.layout.fragment_first, container, false);
}
public static FirstFragment newInstance(String text) {
FirstFragment f = new FirstFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
#Override
public void clicked(int position) {
Fragment productDetailFragment = ThirdFragment.newInstance(position);
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.add(R.id.frameLayout, productDetailFragment).addToBackStack(null).commit();
Toast.makeText(getContext(), "pos : " + position, Toast.LENGTH_SHORT).show();
}
#Override
public boolean longClicked(int position) {
return false;
}
}
SecondFragment.java
public class SecondFragment extends Fragment {
RecyclerView recyclerView;
static ArrayList<Item> items;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_second, container, false);
recyclerView = v.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
items = new ArrayList<>();
for (int i = 0; i < 100; i++) {
Item item = new Item(R.drawable.accept_state, "esm" + i, Integer.toString(i * 100));
items.add(item);
}
recyclerView.setAdapter(new RecylcerViewAdapter(getContext(), (RecyclerViewListener) getParentFragment(), items));
return v;
}
public static SecondFragment newInstance(String text) {
SecondFragment f = new SecondFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}
ThirdFragment.java
public class ThirdFragment extends android.support.v4.app.Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_third, container, false);
return v;
}
public static ThirdFragment newInstance(int position) {
ThirdFragment f = new ThirdFragment();
Bundle b = new Bundle();
f.setArguments(b);
return f;
}
}
RecyclerViewListener.java
public interface RecyclerViewListener {
void clicked(int position);
boolean longClicked(int position);
}
RecyclerViewAdapter.java
public class RecylcerViewAdapter extends RecyclerView.Adapter<RecylcerViewAdapter.RecyclerViewHolder>{
private Context context;
private RecyclerViewListener recyclerViewListener;
private ArrayList<Item> items;
public RecylcerViewAdapter(Context context, RecyclerViewListener recyclerViewListener, ArrayList<Item> items) {
this.context = context;
this.recyclerViewListener = recyclerViewListener;
this.items = items;
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.recycler_item, parent, false);
RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(view);
return recyclerViewHolder;
}
#Override
public void onBindViewHolder(RecyclerViewHolder holder, int position) {
holder.bind(position);
}
#Override
public int getItemCount() {
return items.size();
}
public class RecyclerViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
TextView name;
TextView cost;
public RecyclerViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
recyclerViewListener.clicked(getAdapterPosition());
}
});
itemView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View view) {
return recyclerViewListener.longClicked(getAdapterPosition());
}
});
imageView = itemView.findViewById(R.id.image);
name = itemView.findViewById(R.id.name);
cost = itemView.findViewById(R.id.cost);
}
public void bind(int position) {
Item item = items.get(position);
imageView.setImageResource(item.getImageID());
name.setText(item.getName());
cost.setText(item.getCost());
}
}
}

First of all, override onBackPressed() and then use use getChildFragmentManager() as shown below:
public void onBackPressed() {
// If the fragment exists and has some back-stack entry
if (myFragment != null && mytFragment.getChildFragmentManager().getBackStackEntryCount() > 0){
// Get the fragment fragment manager - and pop the backstack
myFragment.getChildFragmentManager().popBackStack();
}
// Else, nothing in the direct fragment back stack
else{
// Let super handle the back press
super.onBackPressed();
}
}

Related

nestedviewpager nested fragment error

I have a Viewpager contains Recylerview which has 2 different holders. One of them is also view pager. Hence I have nested viewpager nad nested fragments. When I tap the second tab and tap back the first tab it is fine .But when I tap the third tab and tap back the first tab. It gives following error:
java.lang.IllegalArgumentException: No view found for id 0x7f0f00ce (:id/viewPagerComments) for fragment CommentFragment
MainAcitivty
viewPager.setAdapter(new MainViewPagerAdapter(getSupportFragmentManager(),models.size()));
navigationTabBar.setModels(models);
navigationTabBar.setViewPager(viewPager, 0);
MainViewPagerAdapter
private int size;
public MainViewPagerAdapter(FragmentManager fm, int size) {
super(fm);
this.size = size;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return DashboardtFragment.newInstance(size, position);
default:
return TempFragment.newInstance(size, position);
}
}
DashboardtFragment
public static DashboardtFragment newInstance(int size, int index) {
Bundle args = new Bundle();
args.putInt(ARG_I,index);
args.putInt(ARG_S,size);
DashboardtFragment fragment = new DashboardtFragment();
fragment.setArguments(args);
return fragment;
}
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState)
{
final View v = inflater.inflate(R.layout.dashboard_fragment, null);
return v;
}
#Override
public void showRecyleview(DashboardResponseModel model) {
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
DashboardRecyleViewAdapter adapter = new DashboardRecyleViewAdapter(getActivity(),getChildFragmentManager(),model);
recyclerView.setAdapter(adapter);
}
DashboardRecyleViewAdapter
public static class ViewHolder1 extends RecyclerView.ViewHolder {
public ViewHolder1(View itemView) {
super(itemView);
viewPager = itemView.findViewById(R.id.viewPagerComments);
}
}
case 1 :
return new ViewHolder1( layoutInflater.inflate(R.layout.dashboard_comments, parent,
false));
case 1:
ViewHolder1 viewHolder1 = (ViewHolder1) holder;
viewPager.setAdapter(new CommentViewPagerAdapter(
childFragmentManager,
model.getCommentList().size(),
model.getCommentList()
));
break;
CommentViewPagerAdapter
public CommentViewPagerAdapter(FragmentManager fm, int size,
List<CommentList> list) {
super(fm);
this.size = size;
this.list=list;
}
#Override
public Fragment getItem(int position) {
return CommentFragment.newInstance(size,position,list.get(position));
}
CommentFragment
public static CommentFragment newInstance(int size, int index, CommentList
comment) {
Bundle args = new Bundle();
args.putString(ARG_C,new Gson().toJson(comment));
args.putInt(ARG_I,index);
args.putInt(ARG_S,size);
CommentFragment fragment = new CommentFragment();
fragment.setArguments(args);
return fragment;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup
container, #Nullable Bundle savedInstanceState)
{
final View v = inflater.inflate(R.layout.comment_content, null);
}

PagerAdapter mPagerAdapter;
#Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
super.setAdapter(null);
}
#Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (mPagerAdapter != null) {
super.setAdapter(mPagerAdapter);
}
}
#Override
public void setAdapter(PagerAdapter adapter) {
}
public void storeAdapter(PagerAdapter pagerAdapter) {
mPagerAdapter = pagerAdapter;
}
first create a customviewpager than add the above code. Use storeAdapter instead of setAdapter.

send data to second tab on click button(which is on first tab)

i have two Tabs as Tab1 and Tab2. On button click i want send list row data to send Tab , Following is my code.
PagerAdapter.java
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs = 2;
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
FragmentOne tab1 = new FragmentOne();
return tab1;
case 1:
FragmentTwo tab2 = new FragmentTwo();
return tab2;
default:
return null;
}
}
#Override
public int getCount() {
return mNumOfTabs;
}
}
TAB 1 :
TAB 2 :
FragmentOne.java
public class FragmentOne extends Fragment implements
FirstAdapter.MyClickListner {
private RecyclerView rvMovieList;
MovieModel movieModel;
private FirstAdapter firstAdapter;
private List<MovieModel> movieList = new ArrayList<>();
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_one, container, false);
rvMovieList = (RecyclerView) view.findViewById(R.id.rvMovieList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
rvMovieList.setLayoutManager(mLayoutManager);
rvMovieList.setItemAnimator(new DefaultItemAnimator());
new asyncGetMovie().execute();
return view;
}
#Override
public void onButtonClick(int position) {
Toast.makeText(getActivity(), "Clicked Item "+position, Toast.LENGTH_SHORT).show();
}
class asyncGetMovie extends AsyncTask<String, String, String> {
String jsonString;
ProgressDialog progressDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(getActivity());
progressDialog.setMessage("Loading");
progressDialog.show();
}
#Override
protected String doInBackground(String... strings) {
try {
// here we get movieList
} catch (Exception e) {
e.getMessage();
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
progressDialog.dismiss();
firstAdapter = new FirstAdapter(movieList , FragmentOne.this);
rvMovieList.setAdapter(firstAdapter);
}
}
}
FragmentTwo.java
public class FragmentTwo extends Fragment {
private TextView tvTitle;
public FragmentTwo() {
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_two, container, false);
MovieModel movieModel = null;
tvTitle = (TextView) view.findViewById(R.id.tvTitle);
if (movieModel != null){
movieModel = getArguments().getParcelable("data");
System.out.println(" movieModel title "+movieModel.getTitle());
tvTitle.setText(movieModel.getTitle());
}
return view;
}
}
FirstAdapter.java
public class FirstAdapter extends
RecyclerView.Adapter<FirstAdapter.MyViewHolder> {
private MyClickListner clickListner;
private List<MovieModel> moviesList;
FragmentOne fragament ;
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView tvTitle;
Button btnDetails;
MyClickListner clickListner;
public MyViewHolder(View view) {
super(view);
tvTitle = (TextView) view.findViewById(R.id.tvTitle);
btnDetails = (Button)view.findViewById(R.id.btnDetails);
}
}
public FirstAdapter(List<MovieModel> moviesList, FragmentOne fragmentOne) {
this.moviesList = moviesList;
this.fragament = fragmentOne;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row_movie_list, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
MovieModel movie = moviesList.get(position);
holder.tvTitle.setText(movie.getTitle());
holder.btnDetails.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
fragament.onButtonClick(position);
}
});
}
#Override
public int getItemCount() {
return moviesList.size();
}
public interface MyClickListner{
public void onButtonClick(int position);
}
}

Change you getItem()
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
FragmentOne tab1 = new FragmentOne();
return tab1;
case 1:
FragmentTwo tab2 = new FragmentTwo();
Bundle bundle = new Bundle();
bundle.putExtra("KEY_OF_WHATEVER_YOU_WANT_TO_SEND","VALUE");
tab2.setArguments(bundle);
return tab2;
default:
return null;
}
}

android onClick change fragment

I want to change the Fragment when i click the button. The fragments are in the same adapter/viewpager.
FROM THIS FRAGMENT:
public class LoginFragment extends Fragment {
TextView linkToRegister;
public static final LoginFragment newInstance()
{
LoginFragment mf = new LoginFragment();
Bundle bd = new Bundle(1);
mf.setArguments(bd);
return mf;
}
public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState )
{
View v = inflater.inflate(R.layout.fragment_login, container, false);
linkToRegister = (TextView) v.findViewById(R.id.link_to_register);
linkToRegister.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Change Fragment
}
});
return v;
}
}
TO THIS FRAGMENT:
public class RegisterFragment extends Fragment {
public static final String EXTRA_MESSAGE = "EXTRA_MESSAGE";
public static final RegisterFragment newInstance()
{
RegisterFragment mf = new RegisterFragment();
Bundle bd = new Bundle(1);
mf.setArguments(bd);
return mf;
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState )
{
View v = inflater.inflate(R.layout.fragment_register, container, false);
return v;
}
}
PagerAdapter:
public class WelcomePagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> Welcomefragments;
public WelcomePagerAdapter(FragmentManager fm, List<Fragment> Welcomefragments) {
super(fm);
this.Welcomefragments = Welcomefragments;
}
#Override
public Fragment getItem(int position) {
return this.Welcomefragments.get(position);
}
#Override
public int getCount() {
return this.Welcomefragments.size();
}
}
Activity:
public class WelcomeActivity extends AppCompatActivity {
ViewPager welcomeViewPager;
WelcomePagerAdapter welcomePagerAdapter;
List<Fragment> welcomeFragments;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
welcomeViewPager = (ViewPager) findViewById(R.id.viewPagerWelcome);
welcomeFragments = getWelcomeFragments();
welcomePagerAdapter = new WelcomePagerAdapter(getSupportFragmentManager(), welcomeFragments);
welcomeViewPager.setAdapter(welcomePagerAdapter);
}
public List<Fragment> getWelcomeFragments() {
List<Fragment> newFragment = new ArrayList<Fragment>();
newFragment.add(LoginFragment.newInstance());
newFragment.add(RegisterFragment.newInstance());
return newFragment;
}
}

Step 1: Define a callback interface in the Fragment and hook in the Activity when the Fragment attaches to it.
public class MyFragment extends Fragment {
public interface OnInteractionListener {
void doAction(); // Can include parameters here if needed
}
private OnInteractionListener listener;
#Override
public void onAttach(Context context) {
if (context instanceof OnInteractionListener) {
listener = (OnInteractionListener) context;
} else {
throw new ClassCastException(context + "must implement " + OnInteractionListener.class.getSimpleName());
}
super.onAttach(context);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_layout, container, false);
// ...
return v;
}
}
Step 2: Make sure your Activity implements that Interface
public class MyActivity extends AppCompatActivity implements MyFragment.OnInteractionListener {
#Override
public void doAction() {
// TODO: Implement this... e.g. switch fragments
}
...
}
Step 3: Inside the Fragment, you can invoke the callback whenever you want to perform some action
if (listener != null) {
listener.doAction();
}

From MainActivity(), get the navController and then use the navigate() function:
NavController navController = Navigation.findNavController(this,R.id.nav_host_fragment);
navController.navigate(R.id.nav_grid);

Calling methods between fragments

This is very simplified problem that I have regarding to Fragments and calling methods between fragments. I have put in the code place where I think calling method should be. Correct me if I'm wrong or if you have right solution for my problem. MainFragment extends Fragment because it is not activity... I have navigation drawer so that is how it suppose to be... :)
public class MainFragment extends Fragment{
public MainFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_pager, container, false);
adapter = new CategoriesPagerAdapter(getChildFragmentManager(),Titles,Numboftabs);
pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(adapter);
tabs = (SlidingTabLayout) rootView.findViewById(R.id.tabs);
tabs.setDistributeEvenly(true);
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
});
tabs.setViewPager(pager);
Toolbar mToolbar = (Toolbar) getActivity().findViewById(R.id.toolbar_actionbar);
final Spinner spinner_nav = (Spinner) mToolbar.findViewById(R.id.spinner_nav);
spinner_nav.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// ...here I need to call method "writeText()" in both fragments to update both TextViews also in both fragments (tabs)
}
});
}
public class CategoriesPagerAdapter extends FragmentStatePagerAdapter {
CharSequence Titles[];
int NumbOfTabs;
public CategoriesPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) {
super(fm);
this.Titles = mTitles;
this.NumbOfTabs = mNumbOfTabsumb;
}
#Override
public Fragment getItem(int position) {
if (position == 0) {
Tab1Class tab1 = new Tab1Class();
return tab1;
} else if (position == 1) {
Tab2Class tab2 = new Tab2Class();
return tab2;
} else {
return null;
}
}
#Override
public CharSequence getPageTitle(int position) {
return Titles[position];
}
#Override
public int getCount() {
return NumbOfTabs;
}
}
Tab2Class:
public class Tab1Class extends Fragment {
TextView tv1;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_tab1, container, false);
tv1 = (TextView) rootView.findViewById(R.id.tv1);
writeText();
}
public void writeText(){
tv1.setText("TV1 text");
}
}
Tab1Class:
public class Tab2Class extends Fragment {
TextView tv2;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_tab2, container, false);
tv2 = (TextView) rootView.findViewById(R.id.tv2);
writeText();
}
public void writeText(){
tv2.setText("TV2 text");
}
}

.
.
.
Toolbar mToolbar = (Toolbar) getActivity().findViewById(R.id.toolbar_actionbar);
final Spinner spinner_nav = (Spinner) mToolbar.findViewById(R.id.spinner_nav);
spinner_nav.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
/////////////////////////Added////////////
adapter.callWrite();
////////////////////////////////////////
}
});
}
public class CategoriesPagerAdapter extends FragmentStatePagerAdapter {
CharSequence Titles[];
int NumbOfTabs;
/////////////////////Added///////////////////
Tab1Class tab1;
Tab2Class tab2;
//////////////////////////////
public CategoriesPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) {
super(fm);
this.Titles = mTitles;
this.NumbOfTabs = mNumbOfTabsumb;
}
#Override
public Fragment getItem(int position) {
if (position == 0) {
tab1 = new Tab1Class();
return tab1;
} else if (position == 1) {
tab2 = new Tab2Class();
return tab2;
} else {
return null;
}
}
////////////////////////////Added////////////////////
public void callWrite(){
if(tab1 != null)
tab1.writeText();
if(tab2 != null)
tab2.writeText();
}
/////////////
.
.
.

Here's an alternative:
public class BlankFragment extends Fragment {
public static final String ACTION_SOME_STUFF_HAPPENED = "stuff_happened_yo";
public static final String EXTRA_STUFF = "this_is_stuff";
public static void notifyStuffHappening(Context context, String stuff){
Intent intent = new Intent(ACTION_SOME_STUFF_HAPPENED);
intent.putExtra(EXTRA_STUFF, stuff);
LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
}
private StuffHappenedReceiver mStuffListener;
public static class StuffHappenedReceiver extends BroadcastReceiver {
final BlankFragment mFragment;
public StuffHappenedReceiver(BlankFragment fragment) {
this.mFragment = fragment;
// listen for changes to the account we're using
IntentFilter filter = new IntentFilter(ACTION_SOME_STUFF_HAPPENED);
LocalBroadcastManager.getInstance(fragment.getContext()).registerReceiver(this, filter);
}
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_SOME_STUFF_HAPPENED.equals(action)) {
mFragment.someStuffHappened(intent.getStringExtra(EXTRA_STUFF));
}
}
}
private void someStuffHappened(String stringExtra) {
}
public BlankFragment() {
// Required empty public constructor
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
mStuffListener = new StuffHappenedReceiver(this);
}
#Override
public void onDetach() {
LocalBroadcastManager.getInstance(getContext()).unregisterReceiver(mStuffListener);
mStuffListener = null;
super.onDetach();
}
}
This shows the basics of a fragment that will register a broadcast receiver automatically as it attaches / detaches from the activity.
If the fragment is not attached, it won't be updated.
To update this fragment, call the static method "notifyStuffHappening"

Pass Values to GridView to TabActivity

in my App i have Gridview and TabActivity.
my Rice.class has gridview,
in MainActivity.class has tabActivity ,
myChild Tabs are FragmentA,FragmentB,FragmnetC.
i want pass my gridview index to FragmnetA.how can i slove this problem.
Rice.class
public class Rice extends ActionBarActivity {
FragmentA fa;
GridView gridView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rice);
gridView=(GridView) findViewById(R.id.gridViewR);
gridView.setAdapter(new MyRAdapter(this));
Intent intent = getIntent();
//Breakfast bf = (Breakfast) getFragmentManager().findFragmentById(R.id.fragment2);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(),MainActivity.class);
intent.putExtra("index",i);
startActivity(intent);
}
});
}
}
class MyRAdapter extends BaseAdapter {
private Context mContext;
public MyRAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
//imageView.setLayoutParams(new GridView.LayoutParams(450, 200));
//imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
//imageView.setPadding(5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
private Integer[] mThumbIds = {
R.drawable.back_1, R.drawable.back_2,
R.drawable.back_3, R.drawable.back_4,
R.drawable.back_5, R.drawable.back_6,
R.drawable.back_11,
};
}
MainActivity.class
public class MainActivity extends FragmentActivity {
ViewPager viewPager=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
FragmentManager fragmentManager = getSupportFragmentManager();
viewPager.setAdapter(new MyFrAdapter(fragmentManager));
Intent intent = getIntent();
int index = intent.getIntExtra("index",0);
}
}
class MyFrAdapter extends FragmentPagerAdapter{
public MyFrAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment fragment = null;
if(i==0){
fragment = new FragmentA();
}
if(i==1){
fragment = new FragmentB();
}
if(i==2){
fragment = new FragmentC();
}
return fragment;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
if(position == 0){
return "Ingredient";
}
if(position == 1){
return "Recipe";
}
if(position == 2){
return "Summary";
}
return null;
}
}
FragmentA.class
public class FragmentA extends Fragment {
TextView textView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a,container,false);
textView = (TextView) view.findViewById(R.id.textView);
return view;
}
}

public class MainActivity extends FragmentActivity {
int mIndex;
ViewPager viewPager=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
FragmentManager fragmentManager = getSupportFragmentManager();
viewPager.setAdapter(new MyFrAdapter(fragmentManager));
Intent intent = getIntent();
mIndex = intent.getIntExtra("index",0);
}
class MyFrAdapter extends FragmentPagerAdapter{
public MyFrAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment fragment = null;
if(i==0){
fragment = new FragmentA().newInstance(mIndex);
}
if(i==1){
fragment = new FragmentB();
}
if(i==2){
fragment = new FragmentC();
}
return fragment;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
if(position == 0){
return "Ingredient";
}
if(position == 1){
return "Recipe";
}
if(position == 2){
return "Summary";
}
return null;
}
}
}
//...
public class FragmentA extends Fragment {
TextView textView;
int FragmentA_index;
public static final String EXTRA_INDEX = "mypackage.index";
public static FragmentA newInstance(int index) {
Bundle args = new Bundle();
args.putInt(EXTRA_INDEX, index);
FragmentA fragment = new FragmentA();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FragmentA_index = getArguments().getInt(EXTRA_INDEX);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a,container,false);
textView = (TextView) view.findViewById(R.id.textView);
return view;
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

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