Develop Reference

Tablayout on swipe not refreshing in android

I am implementing tablayout using view pager and in my scenario I have two tab. In my first tab I have add data which store in share preference. and when I move to second tab then data should be retrieve from share preference and show in listview. When I add the data from my first tab then data is added successfully but not show in my second tab means I have to close my application and again restart the app so that I can see saved the detail which saved from my first tab.
Below is my Activity code.
public class FragmentExample extends AppCompatActivity {
private ViewPagerAdapter viewPagerAdapter;
#BindView(R.id.tabCountryState)
TabLayout tabCountryState;
#BindView(R.id.viewPager)
ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment_example);
ButterKnife.bind(this);
setViewPager();
setTabIcon();
viewPager.setOffscreenPageLimit(2);
tabCountryState.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
Log.e("Current tab is ", "===> " + tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void setViewPager() {
// set Adaapter.
viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager(), FragmentExample.this);
viewPager.setAdapter(viewPagerAdapter);
tabCountryState.setupWithViewPager(viewPager);
}
// set custom icon to tab in Tablayout.
private void setTabIcon() {
// First Tab
View firstTab = (View) LayoutInflater.from(this).inflate(R.layout.tab_icon_first, null);
TextView tvFirsIcon = ButterKnife.findById(firstTab, R.id.tvFirsIcon);
tvFirsIcon.setText("First Tab");
tabCountryState.getTabAt(0).setCustomView(firstTab);
// First Tab
View secondTab = (View) LayoutInflater.from(this).inflate(R.layout.tab_icon_second, null);
TextView tvSecondIcon = ButterKnife.findById(secondTab, R.id.tvSecondIcon);
tvSecondIcon.setText("Second Tab");
tabCountryState.getTabAt(1).setCustomView(secondTab);
}
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private Context context;
private FirstFragment firstFragment;
private SecondFragment secondFragment;
public ViewPagerAdapter(FragmentManager fm, Context mainActivity) {
super(fm);
context = mainActivity;
new FirstFragment();
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
firstFragment = new FirstFragment();
return firstFragment;
case 1:
secondFragment = new SecondFragment();
return secondFragment;
default:
return null;
}
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
return " " + position;
}
}
}
Here is my FirstFragment in which I have added the data into share preference.
public class FirstFragment extends Fragment {
private View v;
#BindView(R.id.btnSubmit)
Button btnSubmit;
#BindView(R.id.edtCityName)
EditText edtCityName;
#BindView(R.id.spStateName)
Spinner spStateName;
private Unbinder unbinder;
private ArrayList<String> alStateName;
private ArrayList<AllStateCityModel> alAllStateCity;
private SpinnerStateAdapter spinnerAdapter;
private int spinnerPosition;
private String strCityName, strSpinnerValue;
#OnClick(R.id.btnSubmit)
public void submit(View view) {
if (spinnerPosition !=0) {
strCityName = edtCityName.getText().toString().trim();
alAllStateCity = SessinoManager.getCityList(getActivity());
if (strCityName.length() > 0) {
alAllStateCity.get(spinnerPosition).getAlCityName().add(new CityStateModel(strCityName));
} else {
}
// Save new data to Session.
SessinoManager.saveCityList(getActivity(), alAllStateCity);
SecondFragment.cityAdapter.notifyDataSetChanged();
Toast.makeText(getActivity(), "Detail saved successfully ", Toast.LENGTH_SHORT).show();
edtCityName.setText("");
} else {
Toast.makeText(getActivity(), "Please select state", Toast.LENGTH_SHORT).show();
}
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Bundle args = getArguments();
v = inflater.inflate(R.layout.fragment_first, container, false);
unbinder = ButterKnife.bind(this, v);
// arraylist checking if data is available into session.
if(SessinoManager.getCityList(getActivity()).size()>0){
Log.e("First fragment "," if condition ");
alAllStateCity = SessinoManager.getCityList(getActivity());
alStateName = new ArrayList<>();
for(int i=0;i<alAllStateCity.size();i++){
alStateName.add(alAllStateCity.get(i).getStrStateName());
}
setStateSpinner();
}else{
loadArraylist();
setStateSpinner();
}
return v;
}
private void setStateSpinner() {
spStateName.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
spinnerPosition = i;
spinnerAdapter.notifyDataSetChanged();
strSpinnerValue = alStateName.get(i).toString().trim();
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
spinnerAdapter = new SpinnerStateAdapter(getActivity(), alStateName);
spStateName.setAdapter(spinnerAdapter);
}
private void loadArraylist() {
alAllStateCity = new ArrayList<>();
alStateName = new ArrayList<>();
alStateName.add(0, "Select State");
alStateName.add("Gujarat");
alStateName.add("Maharashtra");
alStateName.add("Madhya Pradesh");
for (int i = 0; i < alStateName.size(); i++) {
alAllStateCity.add(new AllStateCityModel(alStateName.get(i), alAllStateCity.size(), new ArrayList<CityStateModel>()));
}
SessinoManager.saveCityList(getActivity(), alAllStateCity);
}
#Override public void onDestroyView() {
super.onDestroyView();
unbinder.unbind();
Log.e("First fragment "," on destroy");
}
}
Here is my SecondFragment in which I have to get saved detail from Share preference.
public class SecondFragment extends Fragment {
private View v;
private Unbinder unbinder;
#BindView(R.id.lvCityList)
ListView lvCityList;
#BindView(R.id.spinnerStateName)
Spinner spinnerStateName;
private ArrayList<AllStateCityModel> alAllStateCity;
private ArrayList<CityStateModel> alCityName;
private ArrayList<String> alStateName;
private int spinnerPosition;
private SpinnerStateAdapter spinnerAdapter;
private ArrayList<String> alCity;
public static CityAdapter cityAdapter;
private Context context;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Bundle args = getArguments();
v = inflater.inflate(R.layout.fragment_two, container, false);
unbinder = ButterKnife.bind(this, v);
context = getActivity();
loadArrayList(context);
Log.e("onCreateView", "onCreateView");
return v;
}
private void loadArrayList(Context context) {
alCityName = new ArrayList<>();
alStateName = new ArrayList<>();
alAllStateCity = SessinoManager.getCityList(context);
for (int j = 0; j < alAllStateCity.size(); j++) {
// Log.e("State name "," =========================> "+allPlayList.get(j).getStrStateName());
// get state name from session
alStateName.add(alAllStateCity.get(j).getStrStateName());
setSpinner(context);
}
}
private void setSpinner(Context context) {
spinnerAdapter = new SpinnerStateAdapter(context, alStateName);
spinnerStateName.setAdapter(spinnerAdapter);
spinnerStateName.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
spinnerPosition = i;
spinnerAdapter.notifyDataSetChanged();
setList(spinnerPosition);
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
private void setList(int position) {
alCityName = alAllStateCity.get(position).getAlCityName();
alCity = new ArrayList<>();
for (int i = 0; i < alCityName.size(); i++) {
// Log.e("City name "," !!!!!!!!!!!!!!!!"+alCityName.get(i).getStrCity());
alCity.add(alCityName.get(i).getStrCity());
}
cityAdapter = new CityAdapter(context, alCity);
lvCityList.setAdapter(cityAdapter);
cityAdapter.notifyDataSetChanged();
}
}
And I am saving data into Share preference which is given below.
public class SessinoManager {
private static final String CITY_PREFERENCE = "city_preference";
// Save data to share preference.
public static void saveCityList(Context context, ArrayList<AllStateCityModel> alAllPlayList) {
try {
SharedPreferences settings;
SharedPreferences.Editor editor;
settings = context.getSharedPreferences(CITY_PREFERENCE,Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonUsers = gson.toJson(alAllPlayList);
editor.putString("all_play_list", jsonUsers);
editor.commit();
// Check to save data into share preferent
for(int j=0;j<alAllPlayList.size();j++){
Log.e("State name ","----------------------"+alAllPlayList.get(j).getStrStateName());
ArrayList<CityStateModel> cityName = alAllPlayList.get(j).getAlCityName();
for(int i=0;i<cityName.size();i++){
Log.e("cityName "," in session ==> "+cityName.get(i).getStrCity());
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static ArrayList<AllStateCityModel> getCityList(Context context)
{
SharedPreferences settings;
List<AllStateCityModel> users = new ArrayList<>();
settings = context.getSharedPreferences(CITY_PREFERENCE,Context.MODE_PRIVATE);
if (settings.contains("all_play_list"))
{
String jsonUsers = settings.getString("all_play_list", null);
Gson gson = new Gson();
AllStateCityModel[] userItems = gson.fromJson(jsonUsers,AllStateCityModel[].class);
users = Arrays.asList(userItems);
users= new ArrayList<AllStateCityModel>(users);
}
return (ArrayList<AllStateCityModel>) users;
}
}
When I add new city detail into first tab then data is data successfully but when I swipe or move to next then data is not displaying and I have to restart whole application to get updated data from Share preference. Kindly help me to resolve this issue. Thanks in advance.

I have resolved the problem by implementing below method setUserVisibleHint.
public class SecondFragment extends Fragment {
private View v;
private Unbinder unbinder;
#BindView(R.id.lvCityList)
ListView lvCityList;
#BindView(R.id.spinnerStateName)
Spinner spinnerStateName;
private ArrayList<AllStateCityModel> alAllStateCity;
private ArrayList<CityStateModel> alCityName;
private ArrayList<String> alStateName;
private int spinnerPosition;
private SpinnerStateAdapter spinnerAdapter;
private ArrayList<String> alCity;
public static CityAdapter cityAdapter;
private Context context;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Bundle args = getArguments();
v = inflater.inflate(R.layout.fragment_two, container, false);
unbinder = ButterKnife.bind(this, v);
context = getActivity();
loadArrayList(context);
// Log.e("onCreateView", "onCreateView");
return v;
}
private void loadArrayList(Context context) {
alCityName = new ArrayList<>();
alStateName = new ArrayList<>();
alAllStateCity = SessinoManager.getCityList(context);
for (int j = 0; j < alAllStateCity.size(); j++) {
// Log.e("State name "," =========================> "+allPlayList.get(j).getStrStateName());
// get state name from session
alStateName.add(alAllStateCity.get(j).getStrStateName());
setSpinner(context);
}
}
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
Log.e("setUserVisibleHint","setUserVisibleHint "+isVisibleToUser);
if(isVisibleToUser==true){
loadArrayList(context);
}
}
#Override
public boolean getUserVisibleHint() {
Log.e("getUserVisibleHint","getUserVisibleHint "+super.getUserVisibleHint());
return super.getUserVisibleHint();
}
private void setSpinner(Context context) {
spinnerAdapter = new SpinnerStateAdapter(context, alStateName);
spinnerStateName.setAdapter(spinnerAdapter);
spinnerStateName.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
spinnerPosition = i;
spinnerAdapter.notifyDataSetChanged();
setList(spinnerPosition);
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
private void setList(int position) {
alCityName = alAllStateCity.get(position).getAlCityName();
alCity = new ArrayList<>();
for (int i = 0; i < alCityName.size(); i++) {
// Log.e("City name "," !!!!!!!!!!!!!!!!"+alCityName.get(i).getStrCity());
alCity.add(alCityName.get(i).getStrCity());
}
cityAdapter = new CityAdapter(context, alCity);
lvCityList.setAdapter(cityAdapter);
cityAdapter.notifyDataSetChanged();
}
}

how to add and remove hashmap key/value pair from view-pager fragment

I am using view-pager with fragment in my application. i want to add and remove any key/value from hash-map but it gives me null pointer exception. there are 5 elements in hash-map if i remove last key from map then it works fine. How to solve it.
Below is my problem code :
public class MainActivity extends AppCompatActivity {
ViewPager viewPager;
public PagerAdapter adapter1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager1);
final HashMap<String,Integer> sliderDataList = new HashMap<String,Integer>();
sliderDataList.put("0",R.drawable.first);
sliderDataList.put("1",R.drawable.second);
sliderDataList.put("2",R.drawable.three);
sliderDataList.put("3",R.drawable.four);
sliderDataList.put("4",R.drawable.xiaomi);
adapter1 = new PagerAdapter(getSupportFragmentManager(), sliderDataList, MainActivity.this);
viewPager.setAdapter(adapter1);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
remove("3");
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
}
public void remove(String s){
adapter1.remove(s);
}
public class PagerAdapter extends FragmentStatePagerAdapter {
private HashMap<String, Integer> hMap;
private final Context context;
public PagerAdapter(FragmentManager fm, HashMap<String,Integer> hMap, Context context) {
super(fm);
this.hMap=hMap;
this.context=context;
}
#Override
public int getItemPosition (Object object)
{
return POSITION_NONE;
}
#Override
public Fragment getItem(int position) {
return new SliderFragment(hMap,context,position);
}
#Override
public int getCount() {
return hMap.size();
}
public void remove(String s){
hMap.remove(s);
adapter1.notifyDataSetChanged();
}
}
#SuppressLint("ValidFragment")
public static class SliderFragment extends Fragment {
private HashMap<String, Integer> urls;
private int imageResourceId;
ImageView imageView;
private Context ctx;
public SliderFragment(HashMap<String,Integer> urls, Context c, int pos) {
this.urls = urls;
this.imageResourceId = pos;
this.ctx = c;
}
#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.content_main, container, false);
imageView = (ImageView) view.findViewById(R.id.img);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setImageResource(urls.get(imageResourceId +""));
return view;
}
}
}

public void remove(String s){
if(sliderDataList.containskey("3"))
{
containskey.remove("3");
adapter1.notifydataSetChanged();
}
}

Try this:
Iterator<Map.Entry<String,String>> iter = TestMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry<String,String> entry = iter.next();
if("Sample".equalsIgnoreCase(entry.getValue())){
iter.remove();
}
}
if you just want to remove the null pointer exception, then add this:
if (urls.get(imageResourceId + "") != null)
imageView.setImageResource(urls.get(imageResourceId + ""));

Android - Sending data from fragment to fragment using swipeview

Could be this is a dupe, but I've been looking for solutions and they always slightly differ from my problem.
So:
I'm currently creating an app that has 2 fragments that are swipeable. TaskGroupFragment shows a list and when you click on an item it wil slide to TasksFragment and show you a sublist. What I have to do now is send the id of the selected item from groups to tasks so I can get the sublist out of SQLite.
I know I'm supposed to communicate through the connected MainActivity and I'm already at the point that I've created an interface in TaskGroupsFragment and implemented this in the activity. Tried and tested and the activity receives the TaskGroupID.
The part where I'm stuck is getting this info in TasksFragment. Especially using swipeview makes this harder.
My code:
MainPagerAdapter:
public class MainPagerAdapter extends FragmentStatePagerAdapter {
public MainPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
switch (i) {
case 0: return TaskGroupFragment.newInstance();
case 1: return TasksFragment.newInstance();
default: return TaskGroupFragment.newInstance();
}
}
#Override
public int getCount() {
return 2;
}
}
TaskGroupActivity (sending fragment):
public class TaskGroupFragment extends ListFragment {
private DoItDataSource dataSource;
private List<TaskGroups> groups;
#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_task_group, container, false);
dataSource = new DoItDataSource(getActivity());
dataSource.open();
JSONContainer jsonContainer = dataSource.sqliteToContainer();
dataSource.close();
groups = jsonContainer.getTask_groups();
TaskGroupAdapter adapter = new TaskGroupAdapter(getActivity(), groups);
setListAdapter(adapter);
return view;
}
public static TaskGroupFragment newInstance() {
TaskGroupFragment tgf = new TaskGroupFragment();
return tgf;
}
public interface OnTaskGroupSelectedListener {
public void onTaskGroupSelected(String taskGroupId);
}
OnTaskGroupSelectedListener mListener;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnTaskGroupSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " Interface not implemented in activity");
}
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
((MainActivity)getActivity()).setCurrentItem(1, true);
mListener.onTaskGroupSelected(groups.get(position).getId());
}
}
MainActivity:
public class MainActivity extends FragmentActivity implements
TaskGroupFragment.OnTaskGroupSelectedListener{
private SharedPreferences savedValues;
private DoItDataSource dataSource = new DoItDataSource(this);
private String identifier, user, domain;
private JSONContainer containerToday;
private JSONContainer containerTomorrow;
public ViewPager pager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
savedValues = getSharedPreferences("SavedValues", MODE_PRIVATE);
identifier = savedValues.getString("Identifier", "");
pager = (ViewPager) findViewById(R.id.activity_main_pager);
pager.setAdapter(new MainPagerAdapter(getSupportFragmentManager()));
if (identifier == null || identifier.equals("")) {
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
intent.putExtra("APP_ID", APP_ID);
startActivity(intent);
}
}
#Override
protected void onResume() {
super.onResume();
identifier = savedValues.getString("Identifier", "");
user = savedValues.getString("User", "");
domain = savedValues.getString("Domain", "");
boolean onBackPressed = savedValues.getBoolean("OnBackPressed", false);
//
// getting lists
//
}
private void resultHandling(String json, String day) {
if (day.equals("today")) {
Gson gson = new Gson();
containerToday = gson.fromJson(json, JSONContainer.class);
jsonToSQLite(containerToday, "Today");
} else if (day.equals("tomorrow")) {
Gson gson = new Gson();
containerTomorrow= gson.fromJson(json, JSONContainer.class);
jsonToSQLite(containerTomorrow, "Tomorrow");
}
}
String taskGroupId = "";
#Override
public void onTaskGroupSelected(String taskGroupId) {
this.taskGroupId = taskGroupId;
// Enter missing link here?
}
}
TaskFragment (receiving fragment):
public class TasksFragment extends ListFragment
implements OnClickListener {
private final static String TAG = "TaskItemFragment logging";
private DoItDataSource dataSource;
private List<Tasks> tasks;
#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_task_item, container, false);
Button backButton = (Button)
view.findViewById(R.id.fragment_task_item_bar_back_button);
dataSource = new DoItDataSource(getActivity());
dataSource.open();
tasks = dataSource.getTasks("204"); // 204 is a placeholder, TaskGroupId should be here
dataSource.close();
TasksAdapter adapter = new TasksAdapter(getActivity(), tasks);
setListAdapter(adapter);
backButton.setOnClickListener(this);
return view;
}
public static TasksFragment newInstance() {
TasksFragment tif = new TasksFragment();
return tif;
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Toast.makeText(getActivity(), "Clicked item " + position, Toast.LENGTH_LONG).show();
}
#Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.fragment_task_item_bar_back_button:
((MainActivity)getActivity()).setCurrentItem(0, true);
break;
}
}
}
Solution
Thanks to Alireza! I had to make several changes to his proposed code, but in the end it helped me in finding the solution!
MainPageAdapter:
public class MainPagerAdapter extends FragmentStatePagerAdapter {
// ADDED
private String taskGroupId;
public MainPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
switch (i) {
case 0: return TaskGroupFragment.newInstance();
// MODIFIED
case 1:
Bundle args = new Bundle();
logcat("before setBundle " + taskGroupId);
args.putString("taskGroupId",taskGroupId);
Fragment fragment = new TasksFragment();
fragment.setArguments(args);
return fragment;
default: return TaskGroupFragment.newInstance();
}
}
// ADDED
public void setTaskGroupId(String id){
this.taskGroupId = id;
}
#Override
public int getCount() {
return 2;
}
}
MainActivity:
public class MainActivity extends FragmentActivity implements
TaskGroupFragment.OnTaskGroupSelectedListener{
private SharedPreferences savedValues;
private DoItDataSource dataSource = new DoItDataSource(this);
private String identifier, user, domain;
private JSONContainer containerToday;
private JSONContainer containerTomorrow;
// ADDED
private MainPagerAdapter adapter;
public ViewPager pager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
savedValues = getSharedPreferences("SavedValues", MODE_PRIVATE);
identifier = savedValues.getString("Identifier", "");
// ADDED
adapter = new MainPagerAdapter(getSupportFragmentManager());
pager = (ViewPager) findViewById(R.id.activity_main_pager);
// MODIFIED
pager.setAdapter(adapter);
if (identifier == null || identifier.equals("")) {
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
intent.putExtra("APP_ID", APP_ID);
startActivity(intent);
}
}
#Override
protected void onResume() {
super.onResume();
identifier = savedValues.getString("Identifier", "");
user = savedValues.getString("User", "");
domain = savedValues.getString("Domain", "");
boolean onBackPressed = savedValues.getBoolean("OnBackPressed", false);
//
// Getting lists
//
}
String taskGroupId = "";
#Override
public void onTaskGroupSelected(String taskGroupId) {
this.taskGroupId = taskGroupId;
// ADDED
adapter.setTaskGroupId(taskGroupId);
pager.setAdapter(adapter);
pager.setCurrentItem(1);
}
}
TaskFragment (receiving fragment):
public class TasksFragment extends ListFragment implements OnClickListener {
private final static String TAG = "TaskItemFragment logging";
private DoItDataSource dataSource;
private List<Tasks> tasks;
private String taskGroupId;
#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_task_item, container, false);
Button backButton = (Button) view.findViewById(R.id.fragment_task_item_bar_back_button);
dataSource = new DoItDataSource(getActivity());
// ADDED
Bundle bundle = getArguments();
taskGroupId = bundle.getString("taskGroupId");
// MODIFIED
dataSource.open();
tasks = dataSource.getTasks(taskGroupId);
dataSource.close();
TasksAdapter adapter = new TasksAdapter(getActivity(), tasks);
setListAdapter(adapter);
backButton.setOnClickListener(this);
return view;
}
// CAN BE REMOVED?
//public static TasksFragment newInstance() {
// TasksFragment tif = new TasksFragment();
// return tif;
//}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Toast.makeText(getActivity(), "Clicked item " + position, Toast.LENGTH_LONG).show();
}
#Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.fragment_task_item_bar_back_button:
((MainActivity)getActivity()).setCurrentItem(0, true);
break;
}
}
}
Please note that I'm using taskGroupId as a String, not an int.

First you need to make sure your adapter knows about taskGroupID. just add a variable and a public method to your adapter.
public class MainPagerAdapter extends FragmentStatePagerAdapter {
private int taskGroupId;
public void setTaskGroupId(int id){
this.taskGroupId = id;
}
}
then store a reference to your adapter in your activity. Now simply call this method whenever GroupId changes
#Override
public void onTaskGroupSelected(String taskGroupId) {
this.taskGroupId = taskGroupId;
adapter.setTastGroupId = taskGroupId; //data needed to initialize fragment.
adapter.setCurrentItem(1); //going to TasksFragment page
}
then you need to put some argumants before starting your fragment.
#Override
public Fragment getItem(int i) {
//this code is only for case 1:
Bundle args = new Bundle();
args.putInt("taskGroupId",taskGroupId);
Fragment fragment = new TasksFragment();
fragment.setArguments(args);
return fragment;
}
and lastly use this data in your TaskFragment to show the right content.

Two instances of the same ListFragment in one FragmentActivity using ViewPager

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.

Reverse direction of swiping in viewpager for Arabic language

Yesterday, I posted a question about the PagerAdapter and how to achieve it when using database. I managed to sorted it out, however, I do not want the viewpager to swipe/scroll left I want the opposite (swipe to right). The following is my code:
public class ScrollViewTest6 extends ActionBarAppActivity {
private ViewPager awesomePager;
private static int NUM_AWESOME_VIEWS;
private Context cxt;
private AwesomePagerAdapter awesomeAdapter;
TextView tv;
int _id;
int row_numbers;
int row_position;
private DataAdapter mySQLiteAdapter;
private Cursor cursor;
/** Called when the activity is first created. */
#SuppressWarnings("deprecation")
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
cxt = this;
awesomeAdapter = new AwesomePagerAdapter(awesomeAdapter);
awesomePager = (ViewPager) findViewById(R.id.awesomepager);
awesomePager.setAdapter(awesomeAdapter);
mySQLiteAdapter = new DataAdapter(this);
mySQLiteAdapter.createDatabase();
mySQLiteAdapter.open();
Bundle extras = getIntent().getExtras();
if (extras == null) {
return;
}
_id = extras.getInt("id");
row_numbers = extras.getInt("row_num");
row_position = extras.getInt("row_pos");
NUM_AWESOME_VIEWS = row_numbers;
awesomePager.setCurrentItem(row_position);
cursor = mySQLiteAdapter.get_AllColumns();
this.startManagingCursor(cursor);
this.awesomePager.setOnPageChangeListener(new ViewPager.OnPageChangeListener()
{
#Override
public void onPageScrollStateChanged(int arg0) {
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels){
}
#Override
public void onPageSelected(int position){
}
});
}
private class AwesomePagerAdapter extends PagerAdapter{
public AwesomePagerAdapter(PagerAdapter fm) {
}
#Override
public int getCount() {
return NUM_AWESOME_VIEWS;
}
#Override
public int getItemPosition(Object object) {return POSITION_NONE;}
#Override
public Object instantiateItem(ViewGroup collection, int position) {
LayoutInflater inflater = (LayoutInflater)cxt.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.mylayout, null);
TextView Title = (TextView)layout.findViewById(R.id.title);
if (cursor != null ) {
if (cursor.moveToPosition(position)) {
//do {
//cursor.moveToPosition(position);
String text = cursor.getString(
cursor.getColumnIndexOrThrow(DataAdapter.KEY_Title));
Title.setText(text);
}
}
((ViewPager) collection).addView(layout,0);
return layout;
}
#Override
public void destroyItem(View collection, int position, Object view) {
((ViewPager) collection).removeView((View) view);
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view==((View)object);
}
#Override
public void finishUpdate(View arg0) {
}
#Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
#Override
public Parcelable saveState() {
return null;
}
#Override
public void startUpdate(View arg0) {
}
}
}
I know some people suggest using
setCurrentItem(int); //Last page
But that conflicts with the listview order.
e.g. Listview:
1
2
3
when we use the line above it shows 1 <- 2 <- 3 (starting from 3)
and I want 3 <- 2 <- 1 (starting from 1)

I face this issue and I resolve with this library
use it and your pagination will work right to left perfectly
it work same as ViewPager
https://github.com/diego-gomez-olvera/RtlViewPager
<com.booking.rtlviewpager.RtlViewPager
android:id="#+id/arabicViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
arabicViewPager = (ViewPager) findViewById(R.id.arabicViewPager);
adapterViewPager = new Adpt_fragmentPageAdapter(getSupportFragmentManager());
arabicViewPager.setAdapter(adapterViewPager);
tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
tabLayout.setupWithViewPager(arabicViewPager);

Thanks to AleksG
Here is what he suggested to do which works for the required purpose, so add the following line to the list:
setCurrentItem(count - 1)
Then in the cursor you'll need to set up the list order in the cursor "_desc"
Thanks again.