I am developing an android app for students who can take test and exams.Here my question is that I have set of questions say 50 each having 4 answer options in a selectable listview manner.Now,what i want to ask is that i want them to be called in one activity only and not 50 searate activties.
here's the sample code
/***ArrayList goes here*****/
stuff.add("I'm noting.");
stuff.add("I always do nthing.");
stuff.add("All my efforts");
lv = (ListView) findViewById(R.id.list);
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
this,
android.R.layout.simple_list_item_1,stuff );
lv.setAdapter(arrayAdapter);
Button sbt=(Button)findViewById(R.id.sbt);
sbt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(getApplicationContext(),Screen5cActivity.class);
startActivity(i);
}
});
So,one method for doing this that comes to my mind is that take a static counter and keep on recreating that same activity by inflating data from same arraylist but that method gets a bit obfuscated as for storing result and other.
Any,other solutions withh efficiency and better explaination are welcome.
Okay, well here is how i would do this.
I create a MainActivity as Follows :
public class MainActivity extends FragmentActivity implements QuestionAnswerInterface{
private static final String FRAGMENT_TAG = "QuestionAnswerFragment";
private String [] questionsArray = {"How old was John Wayne when he died ?","Who was the First U.S. President ?", "How many vertices are on a Octagon ?"};
private String [][] answers = {{"43","56","34","none of these"},
{"George Bush","Barrack Obama","George Washington","none of these"},
{"6","4","8","none of these"}
};
private QuestionAnswerFragment fragment = null;
private ArrayList<ArrayList<String>> answersListOfLists = null;
private ArrayList<String> answersList = null;
private ArrayList<String> questionsList = null;
// Ultimate Holder to Link the ArrayLists
private HashMap<ArrayList<String>, ArrayList<ArrayList<String>>> questionAnswerList = null;
#Override protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// -------- Setup the Questions -------
setupQuestions(questionsArray, answers);
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
if(fragment == null)
{
// Create the Fragment
fragment = (QuestionAnswerFragment) QuestionAnswerFragment.newInstance(new Bundle(), "Test Example" , questionAnswerList);
ft.add(R.id.frameLayoutTest, fragment, FRAGMENT_TAG);
ft.commit();
}else{
fragment = (QuestionAnswerFragment) fm.findFragmentByTag(FRAGMENT_TAG);
ft.show(fragment);
}
}
private void setupQuestions(String [] questions, String[][] answers)
{
// The Ultimate Wrapper
questionAnswerList = new HashMap<ArrayList<String>, ArrayList<ArrayList<String>>>();
// ArrayList to hold the List of lists of answers
answersListOfLists = new ArrayList<ArrayList<String>>();
// ArrayList to hold the list of Questions
questionsList = new ArrayList<String>();
// Loop Through the Questions
for(int i = 0; i < questionsArray.length ; i++)
{
// Add them to the List
questionsList.add(questions[i]);
}
//*** Magic Stuff ***
for(int l = 0; l < answers.length ; l++)
{
// Needs to be created each time we add a new set of answers
answersList = new ArrayList<String>();
// Loop through the inner array values
for(int m = 0; m < answers[l].length ; m++)
{
// Add the Answers for index l using values of index m
answersList.add(answers[l][m]);
}
answersListOfLists.add(answersList);
}
questionAnswerList.put(questionsList, answersListOfLists);
}
#Override
public void sendBackAnswer(String answer) {
// TODO Auto-generated method stub
}
}
And then My Fragment Class :
public class QuestionAnswerFragment extends Fragment{
private static HashMap<ArrayList<String>, ArrayList<ArrayList<String>>> m_questionAnswerList;
private static String m_textName = null;
private static final String TAG = "QuestionAnswerFragment";
private QuestionAnswerInterface m_callBack = null;
private AnswerAdapter m_adapter = null;
private ArrayList<ArrayList<String>> m_answers = null;
private ArrayList<String> m_questions = null;
private int m_questionCount = 0;
private String currentQuestion = null;
private Entry<ArrayList<String>, ArrayList<ArrayList<String>>> entry = null;
private Iterator<Entry<ArrayList<String>, ArrayList<ArrayList<String>>>> iterator = null;
// UI Elements
private ListView m_listViewAnswers = null;
private Button m_buttonSubmitAnswer = null;
private TextView m_textViewQuestion = null;
// ----------------------------------------------------------------------------
// Interface
public interface QuestionAnswerInterface
{
// Returns the Right or wrong Answer to be kept for score calculation
public abstract void sendBackAnswer(String answer);
}
// Instance Method, so we can share the relevant information with the fragment
public static QuestionAnswerFragment newInstance(Bundle args, String testName, HashMap<ArrayList<String>, ArrayList<ArrayList<String>>> questionAnswerList)
{
QuestionAnswerFragment fragment = new QuestionAnswerFragment();
m_textName = testName;
m_questionAnswerList = questionAnswerList;
fragment.setArguments(args);
return fragment;
}
// --------------------------------------------------------------------------
// Class Overrides
#Override public void onAttach(Activity activity)
{
// Default Behavior
super.onAttach(activity);
try{
// Attach the Interface to the Parent Activity
m_callBack = (QuestionAnswerInterface) activity;
}catch(ClassCastException ex){
// Log the Error
Log.d(TAG, "Failed to Implement Interface in the Parent Activity " + ex.getMessage());
}
}
#Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
// Inflate the Layout from the XML Resource
return inflater.inflate(R.layout.question_answer_fragment, null);
}
#Override public void onActivityCreated(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
// Get a Reference to All the Views
m_listViewAnswers = (ListView) getView().findViewById(R.id.listViewAnswerOptions);
m_textViewQuestion = (TextView) getView().findViewById(R.id.textViewQuestion);
m_buttonSubmitAnswer = (Button) getView().findViewById(R.id.buttonDone);
// Add a Listener to the button & ListView
m_buttonSubmitAnswer.setOnClickListener(SubmitListener);
m_listViewAnswers.setOnItemSelectedListener(AnswerListener);
iterator = m_questionAnswerList.entrySet().iterator();
// Start the test from the Beginning using the String [0] as the first question
entry = iterator.next();
m_questions = entry.getKey();
m_answers = entry.getValue();
Log.d("ArraySize Questions", "Size of the Questions Array is "+ m_questions.size());
Log.d("ArraySize Answers", "Size of the Answers Array is "+ m_answers.size());
// Start the Test
updateTest();
}
public void updateTest()
{
m_textViewQuestion.setText(m_questions.get(m_questionCount));
updateAdapter(m_answers.get(m_questionCount));
m_questionCount += 1;
}
private void updateAdapter(ArrayList<String> arrayList)
{
m_adapter = new AnswerAdapter(getActivity(), arrayList);
m_listViewAnswers.setAdapter(m_adapter);
}
private OnItemSelectedListener AnswerListener = new OnItemSelectedListener()
{
#Override public void onItemSelected(AdapterView<?> adapter, View view, int position, long id)
{
// Get the Position of the List Item Selected
// Check if its correct or do what you need to do.
m_callBack.sendBackAnswer(m_listViewAnswers.getSelectedItem().toString());
}
#Override public void onNothingSelected(AdapterView<?> arg0) { }
};
// Submits the Answer to the Parent Activity
private OnClickListener SubmitListener = new OnClickListener()
{
#Override public void onClick(View view)
{
if(m_questionCount != m_questions.size())
{
// Notify the Parent that we want to share the Users choice
updateTest();
}else{
Toast.makeText(getActivity(), "You have reached the End of the Test", Toast.LENGTH_LONG).show();
}
}
};
}
And finally the Adapter Class
public class AnswerAdapter extends BaseAdapter{
//----------------------------------------------------------
// Member Variables
private Context m_classContext = null;
private ArrayList<String> m_answers = null;
private LayoutInflater m_inflater = null;
//----------------------------------------------------------
// Constructor
public AnswerAdapter(Activity activity, ArrayList<String> answers)
{
this.m_classContext = activity;
this.m_answers = answers;
this.m_inflater = LayoutInflater.from(m_classContext);
}
// RowContainer
public class Row
{
TextView m_textAnswer;
CheckBox m_selectedAnswer;
}
// ---------------------------------------------------------
// Class Overrides
#Override public int getCount()
{
int count = 0;
if(m_answers.size() > 0)
{
count = m_answers.size();
}
return count;
}
#Override public Object getItem(int position)
{
// return the Item at the current position
return m_answers.get(position);
}
#Override public long getItemId(int position)
{
// Return the current items position
return position;
}
#Override public View getView(int position, View convertView, ViewGroup parent)
{
Row theRow ;
if(convertView == null){
theRow = new Row();
convertView = m_inflater.inflate(R.layout.answer_row_item, null);
theRow.m_textAnswer = (TextView) convertView.findViewById(R.id.textViewAnswer);
theRow.m_selectedAnswer = (CheckBox) convertView.findViewById(R.id.checkBoxAnswer);
convertView.setTag(theRow);
}else{
theRow = (Row) convertView.getTag();
}
theRow.m_textAnswer.setText(m_answers.get(position).toString());
return convertView;
}
}
So Thats how i would approach this.
Use the Main Activity to Create new Tests, and then use the Interface to Share the results with the parent, so you can calculate totals and scores.
create one Pojo class with variables question.ans1 to ans4
i.e
class Question{
String question;
String ansOne;
String ansTwo;
String ansThree;
String ansFour;
String correctAns;
String selectedAnswer;
}
Now generate an arraylist with 50 questions;
ArrayList list=new ArrayList();
now generate list view with one text view for question and four check boxes for 4 answers.
Related
I am working on an app that includes shopping feature and items are added to cart.
I have navigation drawer. In that, I have my first fragment called as "POSFragment" in which I have implemented a viewpager as data to be shown in the form of swipeable tabs. The data will be inflated dynamically. So, I have used PagerTabStrip and a viewpager. There is a common fragment called "MenuDetailFragment" in which data will be inflated dynamically through a webservice. the adapter for this fragment is "MenuPagerAdapter". Now, In this fragment the data will shown in listview. In Listview in each row items can be incremented or decremented using plus and minus Buttons in each row. Between these button there is textview where the quantity will be displayed correspondingly. I have used a Linkedhashmap on both buttons so, the items along with the quantity is saved in linkedhashmap and then in Sharedpreferences. It's working fine till now. The issue occurs when I swipe in the View pager and next fragment appears and When I click on increment button or decrement button on item there. In shared preferences, It starts saving the current fragment items and previous fragment data is not there anymore. I have already used the "yourcustomviewpager.setOffscreenPageLimit(3)" So, I can see the selected items with the quantities whe I swipe to and fro but the data i stored in sharedpreferences using Linkedhashmap is not there instead current fragment's data is saved. I want that the new data is added to previous data and data in all the fragments should persist. Is there a way to do so? I have been facing this issue for quite a long time.
Here are some screenshots and relevant code snippet.
public class PosFragment extends Fragment {
private ViewPager viewPager;
View rootview;
String code;
String name;
String desc;
String rate;
String key;
Button viewCartBtn;
static TextView displayPrice;
static TextView noOfItemsInCart;
RippleView rippleView;
//private sendPosition pos;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
Log.e("oncreateview", "called");
// Inflate the layout for this fragment
rootview = inflater.inflate(R.layout.pos_fragment_layout, container, false);
initViews();
new AsyncTaskGetMenu().execute();
return rootview;
}
public void initViews() {
Log.e("init", "called");
viewPager = (ViewPager) rootview.findViewById(R.id.viewPager);
Button viewCartButton = (Button) rootview.findViewById(R.id.view_cart_btn);
viewPager.setOffscreenPageLimit(3);
viewCartBtn = (Button) rootview.findViewById(R.id.view_cart_btn);
AppMethods.setGlametrixBoldFont(getActivity(), viewCartBtn);
displayPrice = (TextView) rootview.findViewById(R.id.textView_totalprice_cart);
noOfItemsInCart = (TextView) rootview.findViewById(R.id.cart_items_quantity);
viewCartBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), ViewCartActivity.class);
intent.putExtra(AppConstants.SUBTOTAL, Integer.parseInt(displayPrice.getText().toString()));
startActivity(intent);
}
});
LinearLayout itemsInCartLinearLayout = (LinearLayout) rootview.findViewById(R.id.ll_items_in_cart);
itemsInCartLinearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), ViewCartActivity.class);
intent.putExtra(AppConstants.SUBTOTAL, Integer.parseInt(displayPrice.getText().toString()));
startActivity(intent);
}
});
}
This is "MenuDetailFragment" class
public class MenuDetailFragment extends Fragment {
View rootview;
private ListView listView;
private ArrayList<MenuHeadingDetailsModel> menuheadingDetailList;
private Communicate comm;
LinkedHashMap<String, ViewCartDetailsModel> viewCartDetailsModelMap = new LinkedHashMap<>();
ViewCartDetailsModel viewCartDetailsModel;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout for this fragment
rootview = inflater.inflate(R.layout.menu_list, container, false);
InitializeViews();
return rootview;
}
public void InitializeViews() {
listView = (ListView) rootview.findViewById(R.id.menu_items_list);
Bundle bundle = getArguments();
menuheadingDetailList = bundle.getParcelableArrayList(AppConstants.MENU_KEY);
listView.setAdapter(new MenuAdapter(getActivity(), menuheadingDetailList));[enter image description here][1]
This is"MenuPagerAdapter" class
public class MenuPagerAdapter extends FragmentStatePagerAdapter {
List<MenuModel> menu;
public MenuPagerAdapter(FragmentManager fm, List<MenuModel> menuList) {
super(fm);
this.menu = menuList;
}
#Override
public CharSequence getPageTitle(int position) {
return menu.get(position).getHeading().toString();
}
private List<MenuHeadingDetailsModel> getMenuHeadingDetails(int pos) {
return this.menu.get(pos).getMenuHeadingDetailList();
}
#Override
public Fragment getItem(int position) {
Fragment fragment = new MenuDetailFragment();
Bundle bundle = new Bundle();
bundle.putParcelableArrayList(AppConstants.MENU_KEY, (ArrayList<? extends Parcelable>) getMenuHeadingDetails(position));
fragment.setArguments(bundle);
return fragment;
}
#Override
public int getCount() {
return menu.size();
}
#Override
public void unregisterDataSetObserver(DataSetObserver observer) {
if (observer == null) {
super.unregisterDataSetObserver(observer);
}
}
#Override
public void destroyItem (ViewGroup container, int position, Object object)
{
Log.e("destroyitem","called");
}
}
class MenuAdapter extends BaseAdapter {
//ViewHolder holder;
Context context;
List<MenuHeadingDetailsModel> myItems = new ArrayList<>();
Button buttonPlus, buttonMinus;
int totalAmount = 0;
int pagePosition;
public MenuAdapter(Context context, List<MenuHeadingDetailsModel> myItems) {
this.context = context;
this.myItems = myItems;
}
#Override
public int getCount() {
return myItems.size();
}
#Override
public Object getItem(int position) {
return myItems.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder = new ViewHolder();
final LayoutInflater inflater = getActivity().getLayoutInflater();
convertView = inflater.inflate(R.layout.menu_list_item, null);
viewHolder.codeText = (TextView) convertView.findViewById(R.id.textView_code);
viewHolder.nameText = (TextView) convertView.findViewById(R.id.textView_name);
AppMethods.setGlametrixBoldFont(getActivity(), viewHolder.nameText);
viewHolder.descText = (TextView) convertView.findViewById(R.id.textView_desc);
viewHolder.rateText = (TextView) convertView.findViewById(R.id.textView_rate);
viewHolder.textViewNoOfItems = (TextView) convertView.findViewById(R.id.tv_no_of_items);
buttonMinus = (Button) convertView.findViewById(R.id.button_minus);
buttonPlus = (Button) convertView.findViewById(R.id.button_plus);
final MenuHeadingDetailsModel menu = myItems.get(position);
viewHolder.codeText.setText(menu.getCode());
viewHolder.nameText.setText(menu.getItemName());
viewHolder.descText.setText(menu.getDescription());
viewHolder.rateText.setText(menu.getRate());
viewHolder.textViewNoOfItems.setText("" + menu.getQuantity());
buttonPlus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MenuHeadingDetailsModel menuList = myItems.get(position);
menuList.setQuantity(menuList.getQuantity() + 1);
myItems.set(position, menuList);
int itemRate = Integer.parseInt(myItems.get(position).getRate());
int itemQuan = menuList.getQuantity();
String code = menuList.getCode();
String name = menuList.getItemName();
int totalAmountPerItem = itemQuan * itemRate;
viewCartDetailsModel = new ViewCartDetailsModel(code, name, itemQuan, itemRate);
viewCartDetailsModelMap.put(viewCartDetailsModel.getCode(), viewCartDetailsModel);
Log.e("hashmap", "size" + viewCartDetailsModelMap.size());
Gson gson = new Gson();
String hashMapToString = gson.toJson(viewCartDetailsModelMap);
AppPreferences.saveDataInSharedpreferences(getActivity(), AppConstants.VIEW_ITEMS_INT_CART_KEY, hashMapToString);
totalAmount += itemRate;
int amount = totalAmount;
onButtonPressedForAmount(amount);
notifyDataSetChanged();
int quan = 0;
TextView tv;
for (int i = 0; i < listView.getCount(); i++) {
View view = listView.getAdapter().getView(i, null, null);
tv = (TextView) view.findViewById(R.id.tv_no_of_items);
quan = quan + Integer.parseInt(tv.getText().toString());
}
onButtonClickedForQuantity(quan);
}
}
);
buttonMinus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MenuHeadingDetailsModel menuList = myItems.get(position);
if ((menuList.getQuantity() - 1) >= 0) {
menuList.setQuantity(menuList.getQuantity() - 1);
myItems.set(position, menuList);
int itemRate = Integer.parseInt(myItems.get(position).getRate());
int itemQuan = menuList.getQuantity();
String code = menuList.getCode();
String name = menuList.getItemName();
//int totalAmountPerItem = itemQuan * itemRate;
viewCartDetailsModel = new ViewCartDetailsModel(code, name, itemQuan, itemRate);
if (itemQuan == 0) {
viewCartDetailsModelMap.remove(code);
} else {
viewCartDetailsModelMap.put(viewCartDetailsModel.getCode(), viewCartDetailsModel);
}
Gson gson = new Gson();
String hashMapToString = gson.toJson(viewCartDetailsModelMap);
AppPreferences.saveDataInSharedpreferences(getActivity(), AppConstants.VIEW_ITEMS_INT_CART_KEY, hashMapToString);
if (totalAmount > 0) {
totalAmount -= itemRate;
Log.e("totalamount", "minus" + totalAmount);
int amount = totalAmount;
onButtonPressedForAmount(amount);
}
} else {
menuList.setQuantity(0);
myItems.set(position, menuList);
}
notifyDataSetChanged();
int quan = 0;
TextView tv;
for (int i = 0; i < listView.getCount(); i++) {
View view = listView.getAdapter().getView(i, null, null);
tv = (TextView) view.findViewById(R.id.tv_no_of_items);
quan = quan + Integer.parseInt(tv.getText().toString());
}
onButtonClickedForQuantity(quan);
}
}
);
return convertView;
}
public void onButtonPressedForAmount(int userData) {
if (comm != null) {
comm.sendAmount(userData);
}
}
public void onButtonClickedForQuantity(int quantity) {
if (comm != null) {
comm.sendQuantity(quantity);
}
}
class ViewHolder {
TextView nameText;
TextView codeText;
TextView descText;
TextView rateText;
TextView textViewNoOfItems;
}
}
//For settings fonts to the alert diaolog for customization of items
//public void setGlametrixBoldFont(TextView textView) {
//Typeface typeface = Typeface.createFromAsset(getActivity().getAssets(), "fonts/GlametrixBold.otf");
//textView.setTypeface(typeface);
// }
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
comm = (Communicate) activity;
} catch (Exception e) {
AppMethods.getStackTrace(e);
}
}
public interface Communicate {
public void sendAmount(int amount);
public void sendQuantity(int quantity);
}
// public void getPosition(int Position) {
//
// int pagePosition = Position;
// Log.e("pos", " " + pagePosition);
// }
}
You can get your current fragment inside view pager by following below way
SampleFragment sampleFr = (SampleFragment) viewPager.getAdapter().instantiateItem(viewPager, 0);
Now you can access any data you want using that fragment.
For the first time adding fragments in view pager do like below way.
BaseFragment frTimeLine = (BaseFragment) Fragment.instantiate(this, SampleFragment.class.getName());
fragments.add(frTimeLine);
BaseFragment frEarnTiqs = (BaseFragment) Fragment.instantiate(this, SampleFragment1.class.getName());
fragments.add(frEarnTiqs);
adapter = new ViewPagerAdapter(getSupportFragmentManager(), getResources(), fragments);
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(3);
I am unable to refresh my ListView in ListFragment with new data. Instead the new data is added to the previous.
The time period is from 6AM to 5PM for each entity. Then new data is appended to the list restarting at 6AM for another entity. The data for the first entity should be cleaned before the second is added to the ListView.
Here is the code:
public class FragmentStatePagerSupport extends FragmentActivity {
static final int NUM_ITEMS = 4; //control number of fragments
MyAdapter mAdapter;
ViewPager mPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(null);
mPager.setAdapter(mAdapter);
}
//===============================================================================================
public static class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
fragNumber = position;
return ArrayListFragment.newInstance(position);
}
}
//===============================================================================================
public static class ArrayListFragment extends ListFragment {
Integer mNum;
String FORMAT_LINE = "%s%7s%7s%10s%16s";
static ArrayListFragment newInstance(int num) {
ArrayListFragment f = new ArrayListFragment();
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
View tv = v.findViewById(R.id.text);
View tvd = v.findViewById(R.id.tv_description);
String title = "";
switch (mNum){
case 0:title = MyGlobals.getInstance().getToday();break;
case 1:title = MyGlobals.getInstance().getTomorrow();break;
case 2:title = MyGlobals.getInstance().getDayAfter();break;
case 3:title = MyGlobals.getInstance().getDayDayAfter();break;
}
((TextView) tv).setText(MyGlobals.getInstance().getName() + " on " + title);
((TextView) tvd).setText(String.format(FORMAT_LINE, "time", "temp", "rain", "wind", "weather"));
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
ArrayList<Data> row = Data.getRows(mNum);
ListViewAdapter adapter = new ListViewAdapter(getActivity(), row);
getListView().setAdapter(null);
getListView().setAdapter(adapter);
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
v.setBackgroundColor(getResources().getColor(R.color.blue));
}
}
//==============================================================================================
public static class ListViewAdapter extends ArrayAdapter<Data> {
public static class ViewHolder{
TextView time;
TextView temp;
TextView rain;
TextView wind_speed;
TextView weather;
}
public ListViewAdapter(Context context, ArrayList<Data> list) {super(context, R.layout.text_listview, list); }
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Data data = getItem(position);
ViewHolder holder;
if(convertView == null){
holder=new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView=inflater.inflate(R.layout.text_listview,parent,false);
holder.time=(TextView) convertView.findViewById(R.id.time);
holder.temp=(TextView) convertView.findViewById(R.id.temp);
holder.rain=(TextView) convertView.findViewById(R.id.rain);
holder.wind_speed=(TextView) convertView.findViewById(R.id.wind);
holder.weather=(TextView) convertView.findViewById(R.id.weather);
convertView.setTag(holder);
}else{
holder=(ViewHolder) convertView.getTag();
}
holder.time.setText(data.time);
holder.temp.setText(data.temp);
holder.rain.setText(data.rain);
holder.wind_speed.setText(data.wind_speed);
holder.weather.setText(data.weather);
return convertView;
}
}
}
This last piece populates the ListView. The calls adapter.clear() and adapter.notifyDataSetChanged() does not resolve the problem.
There is a similar question from 3 years ago How update ListView in ListFragment from FragmentActivity? still without accepted response despite the 6836 views.
Thanks a Lot.
The GetRows(mNum) piece as requested:
public class Data {
public String time;
public String temp;
public String rain;
public String wind_speed;
public String weather;
public Data(String time, String temp, String rain, String wind_speed, String weather) {
this.time = time;
this.temp = temp;
this.rain = rain;
this.wind_speed = wind_speed;
this.weather = weather;
}
public static ArrayList<Data> getRows(int fragNumber) {
int mNum = fragNumber;
int size;
String myList[] = null;
ArrayList<Data> list = new ArrayList<Data>();
switch (mNum) {
case 0://Today
size = MyGlobals.getInstance().getToday("time").size();
myList = new String[size];
for (int i = 0; i < size; i++) {
String time = (String) MyGlobals.getInstance().getToday("time").get(i);
String temp = (String) MyGlobals.getInstance().getToday("temperature").get(i);
String wind_speed = (String) MyGlobals.getInstance().getToday("wind_speed").get(i);
String pop = (String) MyGlobals.getInstance().getToday("pop").get(i);
//String wind_gust = (String) MyGlobals.getInstance().getToday("wind_gust").get(i); //when null breaks code
String weather = (String) MyGlobals.getInstance().getToday("weather").get(i);
if (time.length() == 4) time = "0" + time;
if (wind_speed.length() == 1) wind_speed = "0" + wind_speed;
if (pop.length() == 1) pop = "0" + pop;
list.add(new Data(time,temp,pop,wind_speed,weather));
}
return list;
case 1://Tomorrow
...snip... same as above with pertinent variables,...
case 2://DayAfter
...snip...
case 3://DayDayAfter
...snip....
case 4:// is an error
Log.d("***error***", "list got to case 5");
}
return list;
}
}
Try this;
Before adding new list of Data to the existing list, use list.clear();
Add new Data to the list and you should have only newly added data in the list..
pass the list to your adapter class.
Notify adapter of the new data i.e. adapter.notifyDataSetChanged()
You are returning list twice in your getRows()
remove the "return list" before the case structure
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
// Clear old list here before adding new one.
if (list! = null)
{
list.clear();
}
// Add New list
list = Data.getRows(mNum);
ListViewAdapter adapter = new
ListViewAdapter(getActivity(), list);
getListView().setAdapter(adapter);
adapter.notifyDataSetChange();
}
It's because everytime you set an Adapter, it will really be added., remove all its data first before setting again so it will be like
mPager.setAdapter(null);
before doing
mPager.setAdapter(mAdapter);
I am new to android and I am trying to create a list view using an array adapter, a run method and multi threading. The list displays all the data from an array list as a single row. How can I get the items from the ArrayList to use the ArrayAdapter display in the list view with multiple rows.
My MainActivity looks like this:
public class MainActivity extends FragmentActivity implements OnClickListener{
..
ArrayList<StorylineData> storylineData;
ArrayList<SummaryData> summary;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSpinnerAPI = (Spinner) findViewById(R.id.spinnerAPI);
mButtonSubmit = (Button) findViewById(R.id.buttonSubmit);
mEditTextResponse = (ListView) findViewById(R.id.editResponse);
mProgressRequest = (ProgressBar) findViewById(R.id.progressRequest);
mButtonSubmit.setOnClickListener(this);
...
#Override
public void onClick(View v) {
toggleProgress(true);
switch (mSpinnerAPI.getSelectedItemPosition()) {
case 0: // Authenticate
...
case 4: // Get Summary Day
MovesAPI.getSummary_SingleDay(summaryHandler, "20150418", null);//Date changed to "20150117"
break;
...
case 10: // Get Storyline Day
MovesAPI.getStoryline_SingleDay(storylineHandler, "20150418", "20140714T073812Z", false);//Date changed to "20150418" "null changed to"20140714T073812Z"
break;
...
toggleProgress(false);
break;
}
}
...
private MovesHandler<ArrayList<StorylineData>> storylineHandler = new MovesHandler<ArrayList<StorylineData>>() {
#Override
public void onSuccess(ArrayList<StorylineData> result) {
toggleProgress(false);
updateResponse(
"Date:\t" + result.get(0).getDate() + "\n"
+ "-----------Activity 1 Summary--------\t" + "\n"
+ "Activity:\t" + result.get(0).getActivity().toString() + "\n"//returns 1587 with .getCaloriesIdle()
...
});
}
}
public void updateResponse(final String message) {
MainActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
mButtonSubmit.setText(message);//Text not displayed without
StorylineAdapter adapter = new StorylineAdapter(MainActivity.this, R.layout.item_storyline, storylineData);
mEditTextResponse.setAdapter(adapter);
}
});
}
My ArrayAdapter class looks like this:
public class StorylineAdapter extends ArrayAdapter<SummaryData>{
private Context context;
private Runnable runnable;
private ArrayList<StorylineData> storylineData;
public StorylineAdapter(Context context, int resource, ArrayList<SummaryData> objects) {
super(context, resource, objects);
this.context = context;
this.runnable = runnable;
this.summary = objects;
}
#Override
public View getView(int position, View convertView, ViewGroup parent){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.item_storyline, parent, false);
//Display in the TextView widget
SummaryData summary1 = summary.get(position);
TextView tv = (TextView) view.findViewById(R.id.textView1);
tv.setText(summary1.getActivity());
return view;
}
}
EDIT (Array adapter get count method returning "StorylineData array is null"):
#Override
public int getCount()
{
if (storylineData!=null)
{
return storylineData.size();
}
else
{
Log.e("Adapter", "StorylinData array is null");
return 0;
}
}
}
Here is my parser class:
public class StorylineData extends ArrayList<StorylineData> {
...Getters/Setters...
/**
* Parse a {#link org.json.JSONObject} from storyline {#link org.json.JSONArray}, then return the corresponding {#link StorylineData} object.
*
* #param jsonObject : the storyline JSON object received from server
* #return corresponding {#link StorylineData}
*/
public static StorylineData parse(JSONObject jsonObject) throws JSONException {
if (jsonObject != null) {
StorylineData storylineData = new StorylineData();
/**Get the data associated with the array named summary **To get a specific JSONArray: Summary*/
JSONArray summariesJsonArray = jsonObject.optJSONArray("summary");
if (summariesJsonArray != null)
for (int i = 0; i < summariesJsonArray.length(); i++) {
/**each time through array will need to get a reference of current object*/
JSONObject summaryJsonObject = summariesJsonArray.optJSONObject(i);
if (summaryJsonObject != null) {
/**===============Translate data from json to Java=================*/
/**Create a new OBJECT OF ARRAY STORYLINE/SUMMARY*/
ArrayList<SummaryData> summary = new ArrayList<SummaryData>(); // initialisation must be outside the loop
storylineData.setSummary(summary);
/**Get summary from json into java*/
summariesJsonArray.getJSONObject(i).getString("distance");
/**Get group from json into java*/
String group = summaryJsonObject.optString("group");//Get name using key e.g. date
storylineData.setGroup(group);
...
storylineData.summary.add(SummaryData.parse(summaryJsonObject));
}
}
JSONArray segmentsJsonArray = jsonObject.optJSONArray("segments");
if (segmentsJsonArray != null) {
for (int i = 0; i < segmentsJsonArray.length(); i++) {
JSONObject segment = segmentsJsonArray.optJSONObject(i);
if (segment != null) {
ArrayList<SegmentData> segments = new ArrayList<SegmentData>(); // initialisation must be outside the loop
storylineData.setSegments(segments);
String type = segment.optString("type");
storylineData.setType(type);
...
storylineData.segments.add(SegmentData.parse(segment));
}
}
}
return storylineData;
}
return null;
}
}
Changed the following lines of code in MainActivity in order to set adapter with onClickListener:
public class MainActivity extends FragmentActivity implements OnClickListener{
...
Changed to:
public class MainActivity extends FragmentActivity implements View.OnClickListener {
...
MainActivity updateResponse method:
public void updateResponse(final String message) {
MainActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
mButtonSubmit.setText(message);
StorylineAdapter adapter = new StorylineAdapter(MainActivity.this, R.layout.item_storyline, storylineData);
mEditTextResponse.setAdapter(adapter);
}
});
}
Changed to:
public void updateResponse(final String message) {
runOnUiThread(new Runnable() {
//MainActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
ListView mListView = (ListView) findViewById(R.id.list_view);
String[] stringArray = message.split("\n");
// This is the array adapter, it takes the context of the activity as a
// first parameter, the type of list view as a second parameter and your
// array as a third parameter.
ArrayAdapter<String> adapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, stringArray);
mListView.setAdapter(adapter);
}
});
}
First, I'll preface my question with the fact that I'm not using a CursorLoader.
I'm pulling in data from a SQLlite database to populate a listview in a ListFragment. The initial load works well, but once the data is manipulated (i.e. an addition is made to the list), the listview NEVER refreshes to show the new data. I am implementing the Loader callbacks like so:
public class BillListingFragment extends ListFragment implements LoaderManager.LoaderCallbacks<List<Bill>> {
private billListAdapter mAdapter;
private static final int LOADER_ID = 1;
private SQLiteDatabase mDatabase;
private BillsDataSource mDataSource;
private BillsStoreDatabaseHelper mDbHelper;
/**
* The fragment argument representing the fragment type (archive or outstanding)
*/
private static final String ARG_FRAGMENT_TYPE = "fragment_type";
/**
* Returns a new instance of this fragment based on type
*/
public static BillListingFragment newInstance(String type) {
// TODO: Make the fragment type an enum
BillListingFragment fragment = new BillListingFragment();
Bundle args = new Bundle();
args.putString(ARG_FRAGMENT_TYPE, type);
fragment.setArguments(args);
return fragment;
}
public BillListingFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.bill_view_layout, container, false);
return rootView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mDbHelper = new BillsStoreDatabaseHelper(getActivity());
mDatabase = mDbHelper.getWritableDatabase();
mDataSource = new BillsDataSource(mDatabase);
mAdapter = new billListAdapter(getActivity(), R.layout.bill_row_layout);
setListAdapter(mAdapter);
getLoaderManager().initLoader(LOADER_ID, null, this);
}
#Override
public Loader<List<Bill>> onCreateLoader(int id, Bundle args) {
BillDataLoader loader = new BillDataLoader(getActivity(), mDataSource);
return loader;
}
#Override
public void onLoadFinished(Loader<List<Bill>> loader, List<Bill> data) {
for(Bill bill: data){
mAdapter.add(bill);
}
setListAdapter(mAdapter);
}
#Override
public void onLoaderReset(Loader<List<Bill>> loader) {
mAdapter.clear();
}
#Override
public void onDestroy() {
super.onDestroy();
mDbHelper.close();
mDatabase.close();
mDataSource = null;
mDbHelper = null;
mDatabase = null;
}
public void reload(){
getLoaderManager().restartLoader(LOADER_ID, null, this);
}
private class billListAdapter extends ArrayAdapter<Bill> {
Context context;
public billListAdapter(Context context, int resourceID){
super(context, resourceID);
this.context = context;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = getActivity().getLayoutInflater().inflate(R.layout.bill_row_layout, parent, false);
}
TextView payToField = (TextView) convertView.findViewById(R.id.nameField);
TextView dueDateField = (TextView) convertView.findViewById(R.id.overdueField);
payToField.setText(getItem(position).getPayTo());
// calculate days until due
Bill bill = getItem(position);
// TODO: Add how many days until bill in overdue field + add color
JodaTimeAndroid.init(getActivity());
DateTime dueDateDt = new DateTime(bill.getDateDue());
DateTime currentDt = new DateTime();
int daysDifference = Days.daysBetween(currentDt.toLocalDate(), dueDateDt.toLocalDate()).getDays();
// depending on what that differential looks like set text / color
if (daysDifference > 1) {
dueDateField.setText(Integer.toString(daysDifference) + " Days");
} else {
if (daysDifference == 0) {
dueDateField.setText("DUE TODAY");
} else {
if (daysDifference < 0) {
}
}
}
return convertView;
}
}
}
I have debugged my code so I know that the onLoadFinished callback is being made after the data has been manipulated. I also know that adapter contains the updated data at this point. I have tried resetting the adapter via setListAdapter(mAdatper) and every notifyDataChanged-like method I can find, but to no avail. What is going on here and how can I get the listview to update?
I have a SherlockFragmentActivity class that collects values from a server and loads it in to my database. This SherlockFragmentActivity as 3 Fragment called the Book, Video and Audios. Each of them are meant to show values that were downloaded into the db. By challenge now is when I open my UI i dont get to see the values on the fragments not until I start clicking each fragment before the values get populated into the list in the fragment. And I even notice a continuous addition of this values. My fragment class is pasted below.
public class BooksFragment extends SherlockListFragment{
TextView textview = null;
String CategoryID = null;
ArrayList<HashMap<String,String>> listBooks = null;
IDatabaseHelper databaseHelper = null;
Activity activity = null;
Context context = null;
ListAdapter adapter = null;
public BooksFragment(){
super();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.books, container, false);
// do your view initialization heres
textview = (TextView)view.findViewById(R.id.textView1);
return view;
}
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
listBooks = new ArrayList<HashMap<String,String>>();
}
#Override
public void onStart() {
super.onStart();
Bundle bundle =this.getArguments();
if(bundle != null){
CategoryID = bundle.getString("CategoryID");
}
this.initializeComponents();
this.populateListView();
}
#Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
activity = getActivity();
context = activity.getBaseContext();
databaseHelper= new DatabaseHelper(context);
}
//Now we are going to initialize components of the fragment
private void initializeComponents(){
ListView listview = getListView();
listview.setOnItemClickListener(listener);
}
//list item click listener
private OnItemClickListener listener = new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
}
};
//This method would be used to collect content from the database and populate the listview item
private void populateListView(){
MedicalBookModel[] booksmodel = this.databaseHelper.ReturnBooks(CategoryID);
if(booksmodel != null){
for(MedicalBookModel book : booksmodel){
HashMap<String,String> bookMap = new HashMap<String,String>();
bookMap.put(MedicalBookModel.MedicalBookModel_ID, book.getID());
bookMap.put(MedicalBookModel.MedicalBookModel_Name,book.getName());
Log.i("values",book.getName());
listBooks.add(bookMap);
}
}
adapter = new SimpleAdapter(context, listBooks,R.layout.list_book,new String[]{ "ID","Name"}, new int[]{ R.id.bookId, R.id.bookName});
setListAdapter(adapter);
}
}
For that you have several solutions :
1- Using the Application instance singleton which is global
2- Creating your own global class to manage your data
3- Use a service bound to the activity (or not) and call backs (maybe intent and broadcast receivers)
4- Pass your object as parceable in argument when adding the fragment
Note that sometimes you will need to invalidate views to force datas to refresh
EXEMPLE OF PARCEABLE OBJECT
public class ImageObject implements Parcelable {
/**
* ATTRIBUTES
*/
protected String _idPicture;
protected String _idAlbum;
protected String _name;
protected String _fileName;
protected String _imageUrl;
protected String _hierarchy;
public ImageObject(String _idPicture, String _idAlbum, String _name, String _fileName, String _imageUrl, String _hierarchy) {
super();
this._idPicture = _idPicture;
this._idAlbum = _idAlbum;
this._name = _name;
this._fileName = _fileName;
this._imageUrl = _imageUrl;
this._hierarchy = _hierarchy;
}
public ImageObject(Parcel in) {
String[] data = new String[6];
in.readStringArray(data);
this._idPicture = data[0];
this._idAlbum = data[1];
this._name = data[2];
this._fileName = data[3];
this._imageUrl = data[4];
this._hierarchy = data[5];
}
public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
public ImageObject createFromParcel(Parcel in) {
return new ImageObject(in);
}
public ImageObject[] newArray(int size) {
return new ImageObject[size];
}
};
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeStringArray(new String[] { this._idPicture, this._idAlbum, this._name, this._fileName, this._imageUrl, this._hierarchy });
}
}