Develop Reference

Viewpager operations triggered on wrong reference

I am having a Viewpager where i am loading data of different categories. I want to show a custom dialog popup whenever user stays on a particular category for 5 seconds or more asking the user if he/she wants to share the content. For that i have used a custom dialog and am hiding/showing based on the condition.
But the problem is, that if i want to open the dialog if the user stays on Viewpager item at position let's say 3, the dialog is opening for the Viewpager item at position 4.
I am not sure why it's referencing the wrong Viewpager item.
I am including the code of Adapter class for the reference.
ArticleAdapter.java
public class ArticleAdapter extends PagerAdapter {
public List<Articles> articlesListChild;
private LayoutInflater inflater;
Context context;
View rootView;
View customArticleShareDialog, customImageShareDialog;
public int counter = 0;
int contentType = 0;
int userId;
public ArticleAdapter(Context context, List<Articles> articlesListChild, int userId) {
super();
this.context = context;
this.userId = userId;
this.articlesListChild = articlesListChild;
}
#Override
public int getCount() {
return articlesListChild.size();
}
#Override
public void destroyItem(View collection, int position, Object view) {
((ViewPager) collection).removeView((View) view);
}
private Timer timer;
private TimerTask timerTask;
public void startTimer() {
timer = new Timer();
initializeTimerTask();
timer.schedule(timerTask, 5*1000, 5*1000);
}
private void initializeTimerTask() {
timerTask = new TimerTask() {
public void run() {
switch (contentType) {
case 1:
showShareDialog("articles");
break;
case 2:
showShareDialog("images");
break;
default :
// Do Nothing
}
}
};
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
#SuppressLint("ClickableViewAccessibility")
#Override
public Object instantiateItem(ViewGroup container, final int position) {
inflater = LayoutInflater.from(container.getContext());
View viewLayout = inflater.inflate(R.layout.article_single_item, null, false);
final ImageView contentIv, imageContentIv;
final TextView sharingTextTv;
final LinearLayout articleShareBtn, articlesLayout, imagesLayout, customArticleShareDialog, customImageShareDialog;
contentIv = viewLayout.findViewById(R.id.content_iv);
articleShareBtn = viewLayout.findViewById(R.id.article_share_btn);
articlesLayout = viewLayout.findViewById(R.id.articles_layout);
imagesLayout = viewLayout.findViewById(R.id.images_layout);
imageContentIv = viewLayout.findViewById(R.id.image_content_iv);
sharingTextTv = viewLayout.findViewById(R.id.sharing_text_tv);
customArticleShareDialog = viewLayout.findViewById(R.id.articles_share_popup);
customImageShareDialog = viewLayout.findViewById(R.id.images_share_popup);
rootView = viewLayout.findViewById(R.id.post_main_cv);
viewLayout.setTag(rootView);
articleShareBtn.setTag(rootView);
// Images
if (articlesListChild.get(position).getArticleCatId() == 1) {
articlesLayout.setVisibility(GONE);
imagesLayout.setVisibility(View.VISIBLE);
RequestOptions requestOptions = new RequestOptions();
requestOptions.placeholder(R.drawable.placeholder);
Glide.with(context)
.setDefaultRequestOptions(requestOptions)
.load(articlesListChild.get(position).getArticleImage())
.into(imageContentIv);
imageContentIv.setScaleType(ImageView.ScaleType.FIT_XY);
sharingTextTv.setText("Found this image interesting? Share it with your friends.");
counter = 0;
startTimer();
// Articles
} else if (articlesListChild.get(position).getArticleCatId() == 2){
RequestOptions requestOptions = new RequestOptions();
requestOptions.placeholder(R.drawable.placeholder);
articlesLayout.setVisibility(View.VISIBLE);
Glide.with(context)
.setDefaultRequestOptions(requestOptions)
.load(articlesListChild.get(position).getArticleImage())
.into(contentIv);
contentIv.setScaleType(ImageView.ScaleType.FIT_XY);
sharingTextTv.setText("Found this article interesting? Share it with your friends.");
counter = 0;
startTimer();
}
container.addView(viewLayout, 0);
return viewLayout;
}
public void showShareDialog(String categoryType) {
if (categoryType.equalsIgnoreCase("articles")) {
new Handler(Looper.getMainLooper()).post(new Runnable() {
public void run() {
customArticleShareDialog.setVisibility(View.VISIBLE);
}
});
} else if (categoryType.equalsIgnoreCase("images")) {
new Handler(Looper.getMainLooper()).post(new Runnable() {
public void run() {
customImageShareDialog.setVisibility(View.VISIBLE);
}
});
}
}
}
ArticleActivity.java
public class ArticleActivity extends AppCompatActivity {
#BindView(R.id.toolbar)
Toolbar toolbar;
#BindView(R.id.drawer_layout)
DrawerLayout drawer;
#BindView(R.id.articles_view_pager)
ViewPager articlesViewPager;
#BindView(R.id.constraint_head_layout)
CoordinatorLayout constraintHeadLayout;
private ArticleAdapter articleAdapter;
private List<List<Articles>> articlesList = null;
private List<Articles> articlesListChild = new ArrayList<>();
private List<Articles> articlesListChildNew = new ArrayList<>();
SessionManager session;
Utils utils;
final static int MY_PERMISSIONS_WRITE_EXTERNAL_STORAGE = 1;
int userIdLoggedIn;
LsArticlesSharedPreference lsArticlesSharedPreference;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
ButterKnife.bind(this);
toolbar.setTitle("");
toolbar.bringToFront();
session = new SessionManager(getApplicationContext());
if (session.isLoggedIn()) {
HashMap<String, String> user = session.getUserDetails();
String userId = user.get(SessionManager.KEY_ID);
userIdLoggedIn = Integer.valueOf(userId);
} else {
userIdLoggedIn = 1000;
}
utils = new Utils(getApplicationContext());
String storedTime = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("lastUsedDate", "");
System.out.println("lastUsedDate : " + storedTime);
if (utils.isNetworkAvailable()) {
insertData();
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
toggle.getDrawerArrowDrawable().setColor(getResources().getColor(R.color.colorWhite));
drawer.addDrawerListener(toggle);
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
MY_PERMISSIONS_WRITE_EXTERNAL_STORAGE);
}
articleAdapter = new ArticleAdapter(getApplicationContext(), articlesListChild, userIdLoggedIn);
toggle.syncState();
clickListeners();
toolbar.setVisibility(View.GONE);
} else {
Intent noInternetIntent = new Intent(getApplicationContext(), NoInternetActivity.class);
startActivity(noInternetIntent);
}
}
#Override
public void onBackPressed() {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
finishAffinity();
super.onBackPressed();
}
}
#Override
public void onStart() {
super.onStart();
}
#Override
public void onStop() {
super.onStop();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.home, menu);
return true;
}
#Override
public boolean onSupportNavigateUp() {
finish();
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_refresh:
articleAdapter.notifyDataSetChanged();
insertData();
Toast.makeText(this, "Refreshed", Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#SuppressLint("ClickableViewAccessibility")
public void clickListeners() {
}
private void insertData() {
Intent intent = new Intent(getBaseContext(), OverlayService.class);
startService(intent);
final SweetAlertDialog pDialog = new SweetAlertDialog(ArticleActivity.this, SweetAlertDialog.PROGRESS_TYPE);
pDialog.getProgressHelper().setBarColor(getResources().getColor(R.color.colorPrimary));
pDialog.setTitleText("Loading");
pDialog.setCancelable(false);
pDialog.show();
Api.getClient().getHomeScreenContents(userIdLoggedIn, new Callback<ArticlesResponse>() {
#Override
public void success(ArticlesResponse articlesResponse, Response response) {
articlesList = articlesResponse.getHomeScreenData();
if (!articlesList.isEmpty()) {
for (int i = 0; i < articlesList.size(); i++) {
articlesListChildNew = articlesList.get(i);
articlesListChild.addAll(articlesListChildNew);
}
articleAdapter = new ArticleAdapter(getApplicationContext(), articlesList, articlesListChild, userIdLoggedIn, toolbar);
articlesViewPager.setAdapter(articleAdapter);
articleAdapter.notifyDataSetChanged();
pDialog.dismiss();
} else {
List<Articles> savedArticles = lsArticlesSharedPreference.getFavorites(getApplicationContext());
if (!savedArticles.isEmpty()) {
articleAdapter = new ArticleAdapter(getApplicationContext(), articlesList, savedArticles, userIdLoggedIn, toolbar);
articlesViewPager.setAdapter(articleAdapter);
articleAdapter.notifyDataSetChanged();
pDialog.dismiss();
} else {
Api.getClient().getAllArticles(new Callback<AllArticlesResponse>() {
#Override
public void success(AllArticlesResponse allArticlesResponse, Response response) {
articlesListChild = allArticlesResponse.getArticles();
articleAdapter = new ArticleAdapter(getApplicationContext(), articlesList, articlesListChild, userIdLoggedIn, toolbar);
articlesViewPager.setAdapter(articleAdapter);
articleAdapter.notifyDataSetChanged();
};
#Override
public void failure(RetrofitError error) {
Log.e("articlesData", error.toString());
}
});
pDialog.dismiss();
}
}
}
#Override
public void failure(RetrofitError error) {
pDialog.dismiss();
Toast.makeText(ArticleActivity.this, "There was some error fetching the data.", Toast.LENGTH_SHORT).show();
}
});
}
}

Issue reason:
You face this issue because the viewpager preload fragments in background. It means that when you see 3rd fragment, the viewpager is instantiating 4th. Due to this workflow your timer for 3rd screen is cancelled and timer for 4th screen is started. Check out this link to understand what is going on.
Solution:
I would do next:
Then set page change listener for your adapter. How to do it
In this listener you can get current page and start timer for this page (and cancel timer for previously visible page).
You don't need to call startTimer() method when you instantiate item in instantiateItem() method.

Toggle play pause ImageView inside listview

I have a list view of songs with play and pause button in every row.
Obviously, I can't have two pause Icon(two playing song)at the same time in my list view So I need to first reset all of them to play Icon then set the selected view to pause Icon.
How can I achieve this?
This is what I have done so far:
In the model class ( Product ):
public boolean paused = true;
private int PlayPauseId;
public int getPlayPauseId(){
return PlayPauseId;
}
public void setPlayPauseId(int playPauseId) {
PlayPauseId = playPauseId;
}
in Adapter:
public interface PlayPauseClick {
void playPauseOnClick(int position);
}
private PlayPauseClick callback;
public void setPlayPauseClickListener(PlayPauseClick listener) {
this.callback = listener;
}
.
.
.
holder.playPauseHive.setImageResource(product.getPlayPauseId());
holder.playPauseHive.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (callback != null) {
callback.playPauseOnClick(position);
}
}
});
my Callback inside my Activity:
#Override
public void playPauseOnClick(int position) {
final Product product = movieList.get(position);
if (product.paused) {
product.setPlayPauseId(R.drawable.ic_pause);
product.paused=false;
}else {
product.setPlayPauseId(R.drawable.ic_play);
product.paused = true;
}
this.adapter.notifyDataSetChanged();
}

You have to check condition in your getView() method of adapter like this:
if (product.paused) {
holder.playPauseHive.setImageResource(R.drawable.ic_play);
}else {
holder.playPauseHive.setImageResource(R.drawable.ic_pause);
}

How to implement onBackPressed() & intents in fragment?

I know that onBackPressed() is a method in activity but, I want to use the functionality in fragments such that when back button is pressed, it gets redirected to another activity via Intent. Is there any solution to this ?
public class News_Events_fragment extends Fragment {
ProgressDialog pd;
ListView lv1;
SharedPreferences sharedPreferences = null;
int NotiCount;
TextView txt_title, txt_msg, textView;
Context context;
Intent intent ;
ArrayList<SliderMsgTitleModel> CurrentOfficersPastList;
NewsActivityAdapter pastAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
context = (Context) getActivity();
View rootView = inflater.inflate(R.layout.activity_news, container, false);
new AsyncTask<Void, Void, ArrayList<SliderMsgTitleModel>>() {
protected void onPreExecute() {
pd = new ProgressDialog(getActivity());
pd.setCancelable(true);
pd.setTitle("UPOA");
pd.setMessage("Please wait,loading the data...");
pd.show();
}
#Override
protected ArrayList<SliderMsgTitleModel> doInBackground(
Void... params) {
System.out.println("In Background");
CurrentOfficersPastList = new ArrayList<SliderMsgTitleModel>();
// display view for selected nav drawer item
ParseQuery<ParseObject> query = ParseQuery.getQuery("message");
query.whereEqualTo("featured_status", true);
// query.whereEqualTo("push_status", true);
query.orderByDescending("updatedAt");
query.selectKeys(Arrays.asList("title"));
query.selectKeys(Arrays.asList("message"));
try {
query.setCachePolicy(ParseQuery.CachePolicy.NETWORK_ELSE_CACHE);
List<ParseObject> results = query.find();
for (int i = 0; i < results.size(); i++) {
ParseObject object = results.get(i);
CurrentOfficersPastList.add(new SliderMsgTitleModel(
object.getString("title"), object
.getString("message")));
System.out.println("title is=="
+ object.getString("title") + "&& message is"
+ object.getString("message") + "size is"
+ CurrentOfficersPastList.size());
}
} catch (Exception e) {
e.getMessage();
}
pd.dismiss();
return CurrentOfficersPastList;
}
#SuppressWarnings("unchecked")
#Override
protected void onPostExecute(ArrayList<SliderMsgTitleModel> value) {
pd.dismiss();
/*Intent ent = new Intent(getActivity(), NewsActivity.class);
ent.putExtra("NEWSLIST", (ArrayList<SliderMsgTitleModel>) value);
startActivity(ent);
System.out.println("Value is" + value.size());*/
CurrentOfficersPastList = new ArrayList<SliderMsgTitleModel>();
CurrentOfficersPastList = value;
lv1 = (ListView) getActivity().findViewById(R.id.list_title);
pastAdapter = new NewsActivityAdapter(getActivity(), R.layout.activity_news_txt, CurrentOfficersPastList);
lv1.setAdapter(pastAdapter);
}
}.execute();
return rootView;
}
public void onBackPressed() {
// TODO Auto-generated method stub
//super.onBackPressed();
//Toast.makeText(getApplicationContext(), "click",2000).show();
String cameback="CameBack";
intent = new Intent(getActivity(),HomeActivity.class);
intent.putExtra("Comingback", cameback);
startActivity(intent);
}
}

You can interact with the fragment using a callback interface. In your activity add the following:
public class MyActivity extends Activity {
protected OnBackPressedListener onBackPressedListener;
public interface OnBackPressedListener {
void doBack();
}
public void setOnBackPressedListener(OnBackPressedListener onBackPressedListener) {
this.onBackPressedListener = onBackPressedListener;
}
#Override
public void onBackPressed() {
if (onBackPressedListener != null)
onBackPressedListener.doBack();
else
super.onBackPressed();
}
#Override
protected void onDestroy() {
onBackPressedListener = null;
super.onDestroy();
}
}
In your fragment add the following:
public class MyFragment extends Fragment implements MyActivity.OnBackPressedListener {
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
((MyActivity) getActivity()).setOnBackPressedListener(this);
}
#Override
public void doBack() {
//BackPressed in activity will call this;
}
}

Yes, There is. You should implement like this.
#Override
public void onBackPressed() {
if (fragment != null)
//user defined onBackPressed method. Not of Fragment.
fragment.onBackPressed();
} else {
//this will pass BackPress event to activity. If not called, it will
//prevent activity to get BackPress event.
super.onBackPressed();
}
}
Explanation
Check whether your fragment is initialized or not. If it is, then pass on back press event to your fragment.
If above condition not passed, just pass back press to your activity so that it will handle it.
Note
Here condition can be anything. I just take fragment initialization as an example. May be that can't be helped you. You need to define your own condition to pass it to fragment.
Edit
I created a sample application on GitHub to implement Back Stack of fragment .
Download Fragment Back Stack application.

Override onKeyDown instead of onBackPressed. Not necessarily . But this works for me
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
String cameback="CameBack";
intent = new Intent(getActivity(),HomeActivity.class);
intent.putExtra("Comingback", cameback);
startActivity(intent);
return true
}
return false;
}

You can implement onKeyListener for your fragment and call next activity within that.
I've never tried this. But i hope it may help
For Example
fragmentObject.getView().setOnKeyListener( new OnKeyListener()
{
#Override
public boolean onKey( View v, int keyCode, KeyEvent event )
{
if( keyCode == KeyEvent.KEYCODE_BACK )
{
//your code here
}
return false;
}
} );

You need to override onBackPressed method in fragment.

Call method of interface implements with child fragment From container activity Android

I'm stuck with communication between activity and fragment using interface. I have created activity with child fragment. I wanna do some stuff with continuous thread defined in activity and during that thread when I'm getting some result at that time I wanna trigger to child fragment to do something.
My Container Activity
public class MySpaceActivity extends BaseDrawerActivity {
private OnSetLastSeenListener mListner;
public static Thread mThread = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setHeaders(Const.MY_SPACE);
super.setSubmenus(Const.MY_SPACE,
Utils.getSubmenuList(Const.MY_SPACE, MySpaceActivity.this),
submenuBean);
// super.attachFragment(submenuBean);
}
#Override
public void setHeaderSubMenu(SubmenuBean subMenuBean) {
// txt_submenu.setText(subMenuBean.getSubmenu_name());
this.submenuBean = subMenuBean;
Log.print("::::: setHeaderSubMenu ::::");
super.attachFragment(submenuBean);
}
public void setsubFragment(SubmenuBean subMenuBean) {
this.submenuBean = subMenuBean;
super.attachSubFragment(submenuBean);
}
#Override
public void onBackPressed() {
super.onBackPressed();
popLastFragment();
}
private void popLastFragment() {
if (super.getNumberOfChilds() > 1) {
super.popSubFragment();
} else {
finish();
}
}
#Override
protected Fragment getFragement() {
StudentsFragment fragment = new StudentsFragment(Const.MY_SPACE,
getSubmenubean());
return fragment;
}
public SubmenuBean getSubmenubean() {
return submenuBean;
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mThread = new Thread(new CountDownTimer(MySpaceActivity.this));
mThread.start();
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
if (mThread.isAlive()) {
mThread.interrupt();
mThread = null;
}
}
public void updateLastSeen(){
Log.print("::::::Call Interface::::::");
mListner.updateLastSeen();
}
class CountDownTimer implements Runnable {
private Context mContext;
private JSONObject mJsonObject;
private JSONArray mJsonArray;
public CountDownTimer(Context mContext) {
this.mContext = mContext;
}
// #Override
public void run() {
while (!Thread.currentThread().isInterrupted()) {
try {
HttpChatLastSeen mChat = new HttpChatLastSeen();
mJsonObject = mChat.Http_ChatLastSeen(mContext);
String mResult = mJsonObject.getString("Result");
if (mResult.equalsIgnoreCase(String
.valueOf(Const.RESULT_OK))) {
mJsonArray = mJsonObject.getJSONArray("UserData");
for (int i = 0; i < mJsonArray.length(); i++) {
mJsonObject = mJsonArray.getJSONObject(i);
new DbStudentMasterBll(mContext).update(
"last_seen", mJsonObject
.getString("LastSeen"), Integer
.parseInt(mJsonObject
.getString("UserId")));
}
} else {
Log.print("MY LAST SEEN Response : "
+ mJsonObject.toString());
}
updateLastSeen();
Thread.sleep(15000);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (Exception e) {
Log.print("ChatLastSeenThread : ", e.getMessage());
}
}
}
}
}
My Child Fragment With Interface :
public class StudentsFragment extends Fragment implements OnSetLastSeenListener{
TextView txt_submenu;
ListView list_students;
SubmenuBean submenuBean;
int Mainmenu;
MySpaceActivity mMySpaceActivity;
ArrayList<DbStudentMasterBean> studentsList;
StudentsAdapter mAdapter = null;
OnSetLastSeenListener mListner;
public StudentsFragment() {
super();
}
public StudentsFragment(int Mainmenu, SubmenuBean submenuBean) {
this.submenuBean = submenuBean;
this.Mainmenu = Mainmenu;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_students, container,
false);
mMySpaceActivity = (MySpaceActivity) getActivity();
txt_submenu = (TextView) view.findViewById(R.id.txt_submenu);
txt_submenu.setText(submenuBean.getSubmenu_name());
txt_submenu.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mMySpaceActivity.openDrawer();
}
});
list_students = (ListView) view.findViewById(R.id.list_colleagues);
studentsList = new DbStudentMasterBll(getActivity()).getAllRecords();
mAdapter = new StudentsAdapter(getActivity(), studentsList, handler);
list_students.setAdapter(mAdapter);
list_students.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
DbStudentMasterBean bean = (DbStudentMasterBean) parent
.getAdapter().getItem(position);
Message msg = new Message();
msg.what = CHAT;
msg.obj = bean;
handler.sendMessage(msg);
}
});
return view;
}
Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case CHAT:
submenuBean.setTag(VIEWCHATSTUDENT);
DbStudentMasterBean bean = (DbStudentMasterBean) msg.obj;
mMySpaceActivity.setsubFragment(submenuBean);
break;
}
};
};
#Override
public void updateLastSeen() {
// TODO Auto-generated method stub
Log.print("!!!!!!!!!Refresh Adapter!!!!!!!!!!!");
mAdapter.notifyDataSetChanged();
}
}
My Interface :
public interface OnSetLastSeenListener {
public void updateLastSeen();
}
So I have implemented interface OnSetLastSeenListener with my child fragment StudentsFragment . Now I'm calling method of tht interface updateLastSeen() from my container activity with thread. But it is not getting trigger to child fragment where I have implemented interface. So I don't know whether it is good way to communicate or not? Let me take your help to suggest on this solution or best way to communicate from child fragment to parent activity.
Thanks,

It is better to use interface when you want to communicate something from Fragment to Activity and not vice versa.
In your case, you can directly call the method in Fragment from Activity through fragment object. No need to use interface.
Something like this (For static fragments)
StudentsFragment fragment = (StudentsFragment) getFragmentManager()
.findFragmentById(R.id.fragmentid);
if (fragment != null && fragment.isInLayout()) {
fragment.updateLastSeen();
}
For dynamic fragment you can use the fragment object directly.

Call Custom Listener in ListFragment from CursorAdapter Event

I have a SherlockListFragment in which I have a custom list item (checkbox, icon and some text) - works fine. The list is populated from a custom CursorAdapter and it is in here that I trap the Checkbox events (so I can preserve the data through orientation changes as well - also works). I want to be able to raise an event in the ListFragment when the user checks one or more checkboxes to display an actionbar item.
I've implemented an interface in the fragment to accept the event but just cannot work out the syntax for raising the fragment event in the cursoradapter's checkbox onClick listener - the event triggers ok but a can't call the listener, can't suss the object to use.
Fragment:
public class ContactListFragment extends SherlockListFragment implements
LoaderManager.LoaderCallbacks<Cursor>
{
public interface ListItemCheckedListener
{
public void OnListItemChecked(int count);
}
private SimpleCursorAdapter mAdapter;
public ListItemCheckedListener checkListener;
public void setListItemListener(ListItemCheckedListener listener)
{
checkListener = listener;
}
<snip>
#Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
<snip>
setListItemListener(new ListItemCheckedListener()
{
#Override
public void OnListItemChecked(int count)
{
// Turn on/off Action Bar Item
//if (count > 0)...
}
});
CursorAdapter:
public class ContactCursorAdapter extends SimpleCursorAdapter
{
<snip>
#Override
public void bindView(View view, Context context, Cursor cursor)
{
<snip>
CheckBox cBox = (CheckBox)view.findViewById(R.id.checkBox);
final int pos = cursor.getPosition();
cBox.setOnClickListener(new OnClickListener()
{
public void onClick(View view)
{
CheckBox cb = (CheckBox)view.findViewById(R.id.checkBox);
if (cb.isChecked())
{
itemChecked.set(pos, true);
countChecked++;
<something>.checkListener(countChecked); // <----- Umm?
}
else if (!cb.isChecked())
{
itemChecked.set(pos, false);
countChecked--;
<something>.checkListener(countChecked); // <----- ditto
}
}
});
cBox.setChecked(itemChecked.get(pos));
}
I've tried all manner of objects for "something" but can't seem to quite get the right one.
Help... please...!

Well, after quite a few dead ends I finally came up with a solution. Don't know if it is a good solution or if it is the "correct" way to do it but it works...
I simply added a public ListItemCheckedListener variable to the CursorAdapter class, assigned my ListFragment ListItemCheckedListener instance to it straight after setting up the adapter and then could call the local instance of the listener within the CursorAdapter and the event would propagate out to the ListFragment.
ListFragment:
public class ContactListFragment extends SherlockListFragment implements
LoaderManager.LoaderCallbacks<Cursor>// , OnQueryTextListener
{
private ContactCursorAdapter _adapter; // <----- HERE
<snip>
#Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
setListItemListener(new ContactListItemCheckedListener()
{
#Override
public void OnListItemChecked(int count)
{
if (count > 0)
{
if (_mode == null)
{
_loaderManager = getLoaderManager();
ContactsActivity activity = (ContactsActivity)getActivity();
_mode = activity.startActionMode(_actionModeCallback);
}
if (_contactInvite != null)
_contactInvite.setRecipCount(count);
}
else
{
if (_mode != null)
{
_mode.finish();
_mode = null;
}
}
}
});
_fragment = this;
setListProcessedListener(new ContactListProcessedListener()
{
public void OnListProcessed(int contactMethod)
{
for (int i = 0; i < _adapter.itemChecked.size(); i++)
_adapter.itemChecked.set(i, false);
_fragment.setListAdapter(_adapter);
_loaderManager.initLoader(0, null, _fragment);
}
});
setEmptyText(this.getString(R.string.contacts_none));
setHasOptionsMenu(true);
_adapter = new ContactCursorAdapter(getActivity(),
R.layout.contact_list_item,
null,
new String[] { Contacts._ID,
Contacts.DISPLAY_NAME,
Contacts.CONTACT_STATUS },
CONTACT_SUMMARY_FIELDS,
0);
_adapter.checkListener = checkListener;
boolean[] iChecked = null;
if (savedInstanceState != null)
{
if (savedInstanceState.containsKey("itemChecked"))
{
iChecked = savedInstanceState.getBooleanArray("itemChecked");
for (int i = 0; i < iChecked.length; i++)
_adapter.itemChecked.add(i, iChecked[i]);
_adapter.countChecked = savedInstanceState.getInt("countChecked");
checkListener.OnListItemChecked(_adapter.countChecked);
}
}
try
{
setListAdapter(_adapter);
setListShown(false);
// Prepare the loader. Either re-connect with an existing one,
// or start a new one.
getLoaderManager().initLoader(0, null, this);
((ContactsActivity)getActivity()).setSearchTextListener(new ContactsActivity.SearchTextListener()
{
#Override
public void OnSearchTextChange(String text)
{
onQueryTextChange(text);
}
});
}
catch (Exception e)
{
Singletons.Logger().error(TAG + ".onActivityCreated() failed",
e.getMessage());
}
}
CursorAdapter:
public class ContactCursorAdapter extends SimpleCursorAdapter
{
<snip>
public ListItemCheckedListener checkListener; // <----- HERE
<snip>
#Override
public void bindView(View view, Context context, Cursor cursor)
{
<snip>
cBox.setOnClickListener(new OnClickListener()
{
public void onClick(View view)
{
CheckBox cb = (CheckBox)view.findViewById(R.id.checkBox);
if (cb.isChecked())
{
itemChecked.set(pos, true);
countChecked++;
checkListener.OnListItemChecked(countChecked); // <----- HERE
}
else if (!cb.isChecked())
{
itemChecked.set(pos, false);
countChecked--;
checkListener.OnListItemChecked(countChecked); // <----- HERE
}
}
});
cBox.setChecked(itemChecked.get(pos));
}
Quite simple and fairly elegant, if I do say so myself. Well... at least it is in comparison to some of my earlier failed attempts(!). I still get the feeling that it isn't the best way to do it, somehow just feels wrong, but hey... it works.
If anyone has any better ways of doing this, I'd love to hear them. In the meanwhile, I hope this helps someone else.