Develop Reference

Store and retrive Listview data using Shared Preferences

I have a listview of ringtones .. I feed the list via mysql database.. (such as song names,song urls ...).
I dynamically add products(ringtones) in my listview by adding new item in my database, so none of this data are inside my app except row icons.
This is the view
As you can see I have a bookmark border icon that when user clicks on it, it will turn into selected...This is how it works :
holder.favImage=(ImageView)v.findViewById(R.id.favImage);
holder.favImage.setImageResource(product.getFavId());
holder.favImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Product product = (Product) mDataItems.get(position);
if(product.faved){
product.setFavId(R.mipmap.bookmarked);
sharedPreference.addFavorite(mContext,product);
product.faved=false;
}
else {
sharedPreference.removeFavorite(mContext,product);
product.setFavId(R.mipmap.bookmark_border);
product.faved = true;
}
notifyDataSetChanged();
}
});
but nothing will happen in my "FAVORITES" tab .. Even the state of bookmark icon when it is selected will not be saved..
Custom Adapter
public class FunDapter<T> extends BaseAdapter {
protected List<T> mDataItems;
protected List<T> mOrigDataItems;
protected final Context mContext;
private final int mLayoutResource;
private final BindDictionary<T> mBindDictionary;
SharedPreference sharedPreference;
public FunDapter(Context context, List<T> dataItems, int layoutResource,
BindDictionary<T> dictionary) {
this(context, dataItems, layoutResource, null, dictionary);
}
public FunDapter(Context context, List<T> dataItems, int layoutResource,
LongExtractor<T> idExtractor, BindDictionary<T> dictionary) {
this.mContext = context;
this.mDataItems = dataItems;
this.mOrigDataItems = dataItems;
this.mLayoutResource = layoutResource;
this.mBindDictionary = dictionary;
sharedPreference = new SharedPreference();
}
public void updateData(List<T> dataItems) {
this.mDataItems = dataItems;
this.mOrigDataItems = dataItems;
notifyDataSetChanged();
}
#Override
public int getCount() {
if (mDataItems == null || mBindDictionary == null) return 0;
return mDataItems.size();
}
#Override
public T getItem(int position) {
return mDataItems.get(position);
}
#Override
public long getItemId(int position) {
if(idExtractor == null) return position;
else return idExtractor.getLongValue(getItem(position), position);
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View v = convertView;
final GenericViewHolder holder;
if (null == v) {
LayoutInflater vi =
(LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(mLayoutResource, null);
holder = new GenericViewHolder();
holder.root = v;
//init the sub views and put them in a holder instance
FunDapterUtils.initViews(v, holder, mBindDictionary);
v.setTag(holder);
}else {
holder = (GenericViewHolder) v.getTag();
}
final T item = getItem(position);
showData(item, holder, position);
final Product product = (Product) mDataItems.get(position);
holder.favImage=(ImageView)v.findViewById(R.id.favImage);
holder.favImage.setImageResource(product.getFavId());
holder.favImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(product.faved){
product.setFavId(R.mipmap.bookmarked);
sharedPreference.addFavorite(mContext,product);
product.faved=false;
}
else {
sharedPreference.removeFavorite(mContext,product);
product.setFavId(R.mipmap.bookmark_border);
product.faved = true;
}
notifyDataSetChanged();
}
});
return v;
}
}
Product model class
#SuppressWarnings("serial")
public class Product implements Serializable {
#SerializedName("pid")
public int pid;
#SerializedName("name")
public String name;
#SerializedName("qty")
public int qty;
#SerializedName("price")
public String description;
#SerializedName("song_url")
public String song_url;
#SerializedName("date")
public String date;
public boolean paused = true;
public boolean faved = true;
private int favId;
public int getFavId() {
return favId;}
public void setFavId(int favId) {
this.favId = favId;}
}
SharedPreferences class
public class SharedPreference {
public static final String PREFS_NAME = "PRODUCT_APP";
public static final String FAVORITES = "Product_Favorite";
public SharedPreference() {
super();
}
// This four methods are used for maintaining favorites.
public void saveFavorites(Context context, List<Product> favorites) {
SharedPreferences settings;
Editor editor;
settings = context.getSharedPreferences(PREFS_NAME,Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonFavorites = gson.toJson(favorites);
editor.putString(FAVORITES, jsonFavorites);
editor.commit();
}
public void addFavorite(Context context, Product product) {
List<Product> favorites = getFavorites(context);
if (favorites == null)
favorites = new ArrayList<Product>();
favorites.add(product);
saveFavorites(context, favorites);
}
public void removeFavorite(Context context, Product product) {
ArrayList<Product> favorites = getFavorites(context);
if (favorites != null) {
favorites.remove(product);
saveFavorites(context, favorites);
}
}
public ArrayList<Product> getFavorites(Context context) {
SharedPreferences settings;
List<Product> favorites;
settings = context.getSharedPreferences(PREFS_NAME,Context.MODE_PRIVATE);
if (settings.contains(FAVORITES)) {
String jsonFavorites = settings.getString(FAVORITES, null);
Gson gson = new Gson();
Product[] favoriteItems = gson.fromJson(jsonFavorites,Product[].class);
favorites = Arrays.asList(favoriteItems);
favorites = new ArrayList<Product>(favorites);
} else
return null;
return (ArrayList<Product>) favorites;
}
}
I'm stuck here for a few days, Can you help me please !

Actually your implementation more complex for the favorite, I thing simply take one column into your database like name isFavorite and by default added zero into this column when you press button then change value zero to one but every time we are not connected with internet so use SQLite database reason behind that size and speed of the SQLite database is more compare to SharedPreferences.
But here you not want to use SQLite database so first download json from the your web service and only change made when user click on the favorite button like
Json format before click:
{unieq_id:”1”, isFavorite :”0”}
Json format after click:
{unieq_id:”1”, isFavorite :”1”}
If isFavourite 0 then your non favorite icon display else display your favorite icon.

Adding favorites in list view using shared preferences

My app has a lost view and every listitem has a favorite button which when clicked should save the list item and save it in shared preferences. All the favorites list items should be displayed in another my favorites activity and when the list item from my favorites activity is long press it should be removed from favorites. When the favorites button is clicked it should turn dark indicating its added to favorites . in my case
1) when list item is added to favorites the favorites button turn dark but when the activity is closed and reopened the button is no longer dark
2)the list items are getting added to my favorites activity but on long press are not getting removed
sharedpreference.java
public class SharedPreference
{
public static final String PREFS_NAME = "MY_APP";
public static final String FAVORITES = "code_Favorite";
public SharedPreference(){
super();
}
public void saveFavorites(Context context, List<CodeList> favorites){
SharedPreferences settings;
Editor editor;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonFavorites = gson.toJson(favorites);
editor.putString(FAVORITES, jsonFavorites);
editor.commit();
}
public void addFavorite(Context context, CodeList code){
List<CodeList> favorites = getFavorites(context);
if(favorites == null)
favorites = new ArrayList<CodeList>();
favorites.add(code);
saveFavorites(context,favorites);
}
public void removeFavorite(Context context, CodeList code) {
ArrayList<CodeList> favorites = getFavorites(context);
if (favorites != null) {
favorites.remove(code);
saveFavorites(context, favorites);
}
}
public ArrayList<CodeList> getFavorites(Context context) {
SharedPreferences settings;
List<CodeList> favorites;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
if (settings.contains(FAVORITES)) {
String jsonFavorites = settings.getString(FAVORITES, null);
Gson gson = new Gson();
CodeList[] favoriteItems = gson.fromJson(jsonFavorites,
CodeList[].class);
favorites = Arrays.asList(favoriteItems);
favorites = new ArrayList<CodeList>(favorites);
} else
return null;
return (ArrayList<CodeList>) favorites;
}
}
my base adapter
public View getView(final int position, View view, ViewGroup parent)
{
final ViewHolder holder;
if(view == null){
holder = new ViewHolder();
view = inflater.inflate(R.layout.beg_list_item,null);
holder.listHeading = (TextView) view.findViewById(R.id.beg_list_itemTextView);
// holder.listHash = (TextView) view.findViewById(R.id.listview_hashtags);
holder.alphabetList = (ImageView) view.findViewById(R.id.beg_list_itemImageView);
holder.favoriteImg = (ImageView) view.findViewById(R.id.favbtn);
view.setTag(holder);
}else{
holder = (ViewHolder) view.getTag();
}
CodeList code = (CodeList) getItem(position);
holder.listHeading.setText(codeList.get(position).getListHeading());
imageLoader.DisplayImage(codeList.get(position).getAlphabetimg(),
holder.alphabetList);
// holder.listHash.setText(codeList.get(position).getListHashTags());
if (checkFavoriteItem(code)) {
holder.favoriteImg.setImageResource(R.drawable.favorite);
holder.favoriteImg.setTag("yes");
} else {
holder.favoriteImg.setImageResource(R.drawable.unfavorite);
holder.favoriteImg.setTag("no");
}
view.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View arg0){
Intent intent = new Intent(context, SingleItemView.class);
//intent.putExtra("listheading",
// (codeList.get(position).getListHeading()));
//intent.putExtra("alphabetimg",
// (codeList.get(position).getAlphabetimg()));
intent.putExtra("demovideo",
(codeList.get(position).getDailogdemovideo()));
intent.putExtra("download",
(codeList.get(position).getDownloadCode()));
// Start SingleItemView Class
context.startActivity(intent);
}
});
final ImageView favoritesbutton = (ImageView) view.findViewById(R.id.favbtn);
favoritesbutton.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v){
String tag = favoritesbutton.getTag().toString();
if(tag.equalsIgnoreCase("no")){
shrdPrefence.addFavorite(context, codeList.get(position));
Toast.makeText(context, R.string.fav_added, Toast.LENGTH_SHORT).show();
favoritesbutton.setTag("yes");
favoritesbutton.setImageResource(R.drawable.favorite);
}else{
shrdPrefence.removeFavorite(context, codeList.get(position));
favoritesbutton.setTag("no");
favoritesbutton.setImageResource(R.drawable.unfavorite);
Toast.makeText(context, R.string.fav_removed, Toast.LENGTH_SHORT).show();
}
}
});
return view;
}
//Checks whether a particular product exists in SharedPreferences*/
public boolean checkFavoriteItem(CodeList checkCode) {
boolean check = false;
List<CodeList> favorites = shrdPrefence.getFavorites(context);
if (favorites != null) {
for (CodeList code : favorites) {
if (code.equals(checkCode)) {
check = true;
break;
}
}
}
return check;
}
public void add(CodeList code) {
codeList.add(code);
notifyDataSetChanged();
}
public void remove(CodeList code) {
codeList.remove(code);
notifyDataSetChanged();
}
my favorite..java
public class MyFavActivity extends Activity
{
SharedPreference shrdPrfence;
List<CodeList> favorites;
FinalAdapter fnlAdpter;
Context context = this.context;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.fav_layout);
shrdPrfence = new SharedPreference();
favorites = shrdPrfence.getFavorites(MyFavActivity.this);
if(favorites == null){
Dialog dialog = new Dialog(MyFavActivity.this);
dialog.setTitle(R.string.nofav_title);
dialog.show();
}else{
if(favorites.size() == 0){
Dialog dialog = new Dialog(MyFavActivity.this);
dialog.setTitle(R.string.nofav_title);
dialog.show();
}
ListView favList = (ListView) findViewById(R.id.fav_layoutListView);
if(favorites != null){
fnlAdpter = new FinalAdapter(MyFavActivity.this, favorites);
favList.setAdapter(fnlAdpter);
favList.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View arg1,
int position, long arg3) {
}
});
favList.setOnItemLongClickListener(new OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
int position, long id) {
ImageView button = (ImageView) view
.findViewById(R.id.favbtn);
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("no")) {
shrdPrfence.addFavorite(MyFavActivity.this,
favorites.get(position));
Toast.makeText(
MyFavActivity.this,
R.string.fav_added,
Toast.LENGTH_SHORT).show();
button.setTag("yes");
button.setImageResource(R.drawable.favorite);
} else {
shrdPrfence.removeFavorite(MyFavActivity.this,
favorites.get(position));
button.setTag("no");
button.setImageResource(R.drawable.unfavorite);
fnlAdpter.remove(favorites.get(position));
Toast.makeText(
MyFavActivity.this,
R.string.fav_removed,
Toast.LENGTH_SHORT).show();
}
return true;
}
});
}
}
}
}
codelist.java
public class CodeList
{
private String description;
private String dailogdemovideo;
private String downloadCode;
public void setDailogdemovideo(String dailogdemovideo)
{
this.dailogdemovideo = dailogdemovideo;
}
public String getDailogdemovideo()
{
return dailogdemovideo;
}
public void setDownloadCode(String downloadCode)
{
this.downloadCode = downloadCode;
}
public String getDownloadCode()
{
return downloadCode;
}
public void setDescription(String description)
{
this.description = description;
}
public String getDescription()
{
return description;
}
}

Unable to use Shared Preferences for Arraylist

This is my list of songs from the NewList.class: http://postimg.org/image/uieab0wuv/ and i want in another activity to have a favorite list with the songs i get when the star button is long-pressed .
I used this tutorial(http://androidopentutorials.com/android-how-to-store-list-of-values-in-sharedpreferences/) to adapt my project but it doesn't work for an ArrayList
**the activity which generates the list **:
public class NewList extends Activity implements
AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener {
public static final String ARG_ITEM_ID = "product_list";
Activity activity;
ListView productListView;
ArrayList<Track> tracks;
SharedPreference sharedPreference;
private ListView newListView;
private EditText inputSearch;
private int TRACK_POSITION;
private AdapterExploreListView adapterExploreListView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_explore_music);
newListView = (ListView) findViewById(R.id.newListView);
Bundle extras = getIntent().getExtras();
int temp = extras.getInt("id");
TextView mTextView = (TextView) findViewById(R.id.title_genre);
mTextView.setText(Consts.genresArray[temp]);
fillListWithStyle(Consts.genresArray[temp]);
newListView.setOnItemClickListener(this);
newListView.setOnItemLongClickListener(this);
Toast.makeText(getApplicationContext(),
"Position :" + temp, Toast.LENGTH_LONG)
.show();
}
private void fillListWithStyle(final String style)
{
new AsyncTask<Void,Void,ArrayList<Track>>()
{
#Override
protected ArrayList<Track> doInBackground(Void... voids) {
JsonParser parser = new JsonParser();
String encodedURL="";
try {
encodedURL = URLEncoder.encode(style, "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return parser.getTracksForUrl(Consts.url1 + encodedURL + Consts.url2, "tracks");
}
#Override
protected void onPostExecute(ArrayList<Track> tracks) {
super.onPostExecute(tracks);
DataHolder.getInstance().setTracks(tracks);
adapterExploreListView = new AdapterExploreListView(NewList.this, tracks);
newListView.setAdapter(adapterExploreListView);
}
}.execute();
}
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(this, PlayerActivity.class);
intent.putExtra(PlayerActivity.TRACK_POSITION, i);
startActivityForResult(intent, 1);
TRACK_POSITION=i;
}
#Override
public boolean onItemLongClick(AdapterView<?> arg0, View view,
int position, long arg3) {
ImageView button = (ImageView) view.findViewById(R.id.favbutton);
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("grey")) {
sharedPreference.addFavorite(activity, tracks.get(position));
Toast.makeText(activity,
activity.getResources().getString(R.string.add_favr),
Toast.LENGTH_SHORT).show();
button.setTag("red");
button.setImageResource(R.drawable.favoritespic);
} else {
sharedPreference.removeFavorite(activity, tracks.get(position));
button.setTag("grey");
button.setImageResource(R.drawable.favoritespicg);
Toast.makeText(activity,
activity.getResources().getString(R.string.remove_favr),
Toast.LENGTH_SHORT).show();
}
return true;
}
}
the adapter
public class AdapterExploreListView extends ArrayAdapter<Track> {
private Context context;
ArrayList<Track> tracks;
SharedPreference sharedPreference;
public AdapterExploreListView(Context context, ArrayList<Track> tracks) {
super(context, R.layout.row_list_explore, tracks);
this.context = context;
this.tracks = new ArrayList<>();
this.tracks = tracks;
sharedPreference = new SharedPreference();
}
#Override
public int getCount() {
return tracks.size();
}
#Override
public Track getItem(int position) {
return tracks.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
View rowView = view;
// reuse views
if (rowView == null) {
LayoutInflater inflater = LayoutInflater.from(context);
rowView = inflater.inflate(R.layout.row_list_explore, null);
// configure view holder
ViewHolder viewHolder = new ViewHolder();
viewHolder.title = (TextView) rowView.findViewById(R.id.titleTextView);
viewHolder.userName = (TextView) rowView.findViewById(R.id.userNameTextView);
viewHolder.favoriteImg = (ImageView) rowView.findViewById(R.id.favbutton);
rowView.setTag(viewHolder);
}
// fill data
final ViewHolder holder = (ViewHolder) rowView.getTag();
Track track = tracks.get(i);
holder.title.setText(track.getTitle());
holder.userName.setText(track.getUsername());
if (checkFavoriteItem(track)) {
holder.favoriteImg.setImageResource(R.drawable.favoritespic);
holder.favoriteImg.setTag("red");
} else {
holder.favoriteImg.setImageResource(R.drawable.favoritespicg);
holder.favoriteImg.setTag("grey");
}
return rowView;
}
static class ViewHolder {
TextView title;
TextView userName;
ImageView favoriteImg;
}
/*Checks whether a particular product exists in SharedPreferences*/
public boolean checkFavoriteItem(Track checkProduct) {
boolean check = false;
List<Track> favorites = sharedPreference.getFavorites(context);
if (favorites != null) {
for (Track track : favorites) {
if (track.equals(checkProduct)) {
check = true;
break;
}
}
}
return check;
}
#Override
public void add(Track track) {
super.add(track);
tracks.add(track);
notifyDataSetChanged();
}
#Override
public void remove(Track track) {
super.remove(track);
tracks.remove(track);
notifyDataSetChanged();
}
}
**the SharedPreference class **
public class SharedPreference {
public static final String PREFS_NAME = "PRODUCT_APP";
public static final String FAVORITES = "Product_Favorite";
public SharedPreference() {
super();
}
// This four methods are used for maintaining favorites.
public void saveFavorites(Context context, ArrayList<Track> favorites) {
SharedPreferences settings;
Editor editor;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonFavorites = gson.toJson(favorites);
editor.putString(FAVORITES, jsonFavorites);
editor.commit();
}
public void addFavorite(Context context, Track track) {
ArrayList<Track> favorites = getFavorites(context);
if (favorites == null)
favorites = new ArrayList<Track>();
favorites.add(track);
saveFavorites(context, favorites);
}
public void removeFavorite(Context context, Track track) {
ArrayList<Track> favorites = getFavorites(context);
if (favorites != null) {
favorites.remove(track);
saveFavorites(context, favorites);
}
}
public ArrayList<Track> getFavorites(Context context) {
SharedPreferences settings;
ArrayList<Track> favorites;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
if (settings.contains(FAVORITES)) {
String jsonFavorites = settings.getString(FAVORITES, null);
Gson gson = new Gson();
Track[] favoriteItems = gson.fromJson(jsonFavorites,
Track[].class);
favorites = (ArrayList<Track>) Arrays.asList(favoriteItems);
favorites = new ArrayList<Track>(favorites);
} else
return null;
return (ArrayList<Track>) favorites;
}
}
and the activity where i want to generate my list of favorites
public class ForthActivity extends Activity {
SharedPreference sharedPreference;
ArrayList<Track> favorites;
ListView favoriteList;
AdapterExploreListView adapterExploreListView;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.forthact);
// Get favorite items from SharedPreferences.
sharedPreference = new SharedPreference();
favorites = sharedPreference.getFavorites(ForthActivity.this);
if (favorites == null) {
} else {
if (favorites.size() == 0) {
}
favoriteList = (ListView) findViewById(R.id.forthlistview);
if (favorites != null) {
adapterExploreListView = new AdapterExploreListView(ForthActivity.this, favorites);
favoriteList.setAdapter(adapterExploreListView);
favoriteList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View arg1,
int position, long arg3) {
}
});
favoriteList
.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(
AdapterView<?> parent, View view,
int position, long id) {
ImageView button = (ImageView) view
.findViewById(R.id.favbutton);
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("grey")) {
sharedPreference.addFavorite(ForthActivity.this,
favorites.get(position));
Toast.makeText(
ForthActivity.this,
ForthActivity.this.getResources().getString(
R.string.add_favr),
Toast.LENGTH_SHORT).show();
button.setTag("red");
button.setImageResource(R.drawable.favoritespic);
} else {
sharedPreference.removeFavorite(ForthActivity.this,
favorites.get(position));
button.setTag("grey");
button.setImageResource(R.drawable.favoritespicg);
adapterExploreListView.remove(favorites
.get(position));
Toast.makeText(
ForthActivity.this,
ForthActivity.this.getResources().getString(
R.string.remove_favr),
Toast.LENGTH_SHORT).show();
}
return true;
}
});
}
}
}
}
Please help me .Thank you !

#Override
public boolean onItemLongClick(AdapterView<?> arg0, View view,
int position, long arg3) {
ImageView button = (ImageView) view.findViewById(R.id.favbutton);
sharedPreference = new SharedPreference();
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("grey")) {
sharedPreference.addFavorite(NewList.this, tracks.get(position));
Toast.makeText(NewList.this,
NewList.this.getResources().getString(R.string.add_favr),
Toast.LENGTH_SHORT).show();
button.setTag("red");
button.setImageResource(R.drawable.favoritespic);
} else {
sharedPreference.removeFavorite(NewList.this, tracks.get(position));
button.setTag("grey");
button.setImageResource(R.drawable.favoritespicg);
Toast.makeText(NewList.this,
NewList.this.getResources().getString(R.string.remove_favr),
Toast.LENGTH_SHORT).show();
}
return true;
}
and this code
private void fillListWithStyle(final String style)
{
new AsyncTask<Void,Void,ArrayList<Track>>()
{
#Override
protected ArrayList<Track> doInBackground(Void... voids) {
JsonParser parser = new JsonParser();
String encodedURL="";
try {
encodedURL = URLEncoder.encode(style, "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return parser.getTracksForUrl(Consts.url1 + encodedURL + Consts.url2, "tracks");
}
#Override
protected void onPostExecute(ArrayList<Track> trackss) {
super.onPostExecute(trackss);
DataHolder.getInstance().setTracks(trackss);
adapterExploreListView = new AdapterExploreListView(NewList.this, trackss);
tracks = trackss;
newListView.setAdapter(adapterExploreListView);
}
}.execute();
}

I solved my problem ,these are the edits .I hope it will help someone else !
on the new list .class
#Override
public boolean onItemLongClick(AdapterView<?> arg0, View view,
int position, long arg3) {
TextView textView4 = (TextView)view.findViewById(R.id.titleTextView);
TextView textView5 = (TextView)view.findViewById(R.id.userNameTextView);
n =textView4.getText().toString();
m=textView5.getText().toString();
MyObject=new CustomObject(n,m);
sharedPreference = new SharedPreference();
sharedPreference.addFavorite(NewList.this, MyObject);
Toast.makeText(NewList.this,
NewList.this.getResources().getString(R.string.add_favr),
Toast.LENGTH_SHORT).show();
return true;
}
}
the favorites activity *
public class FavActivity extends Activity {
ListView lv;
SharedPreference sharedPreference;
List<CustomObject> favorites;
ProductListAdapter productListAdapter;
Activity context = this;
public static final String FAVORITES = "Favorite";
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.forthact);
sharedPreference = new SharedPreference();
favorites = sharedPreference.getFavorites(context);
lv = (ListView) findViewById(R.id.forthlistview);
fillFavoriteList();
}
private void fillFavoriteList() {
if (favorites != null) {
productListAdapter = new ProductListAdapter(ForthActivity.this, favorites);
lv.setAdapter(productListAdapter);
productListAdapter.notifyDataSetChanged();
}
}
}
the SharedPreferences class
public class SharedPreference {
public static final String PREFS_NAME = "PRODUCT_APP";
public static final String FAVORITES = "Product_Favorite";
public SharedPreference() {
super();
}
// This four methods are used for maintaining favorites.
public void saveFavorites(Context context, List<CustomObject> favorites) {
SharedPreferences settings;
SharedPreferences.Editor editor;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonFavorites = gson.toJson(favorites);
editor.putString(FAVORITES, jsonFavorites);
editor.commit();
}
public void addFavorite(Context context, CustomObject product) {
List<CustomObject> favorites = getFavorites(context);
String s=product.getProp1();
if (favorites == null)
favorites = new ArrayList<CustomObject>();
favorites.add(product);
saveFavorites(context, favorites);
}
public void removeFavorite(Context context, CustomObject product) {
ArrayList<CustomObject> favorites = getFavorites(context);
if (favorites != null) {
favorites.remove(product);
saveFavorites(context, favorites);
}
}
public ArrayList<CustomObject> getFavorites(Context context) {
SharedPreferences settings;
List<CustomObject> favorites;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
if (settings.contains(FAVORITES)) {
String jsonFavorites = settings.getString(FAVORITES, null);
Gson gson = new Gson();
CustomObject[] favoriteItems = gson.fromJson(jsonFavorites,
CustomObject[].class);
favorites = Arrays.asList(favoriteItems);
favorites = new ArrayList<CustomObject>(favorites);
} else
return null;
return (ArrayList<CustomObject>) favorites;
}
}

save arraylist in shared preference

I am storing values in ArrayList and pass it to using bundle to next Fragment, and there I set values to my TextView, till here it works fine, now when go to another page and proceed to app and come back again to that Fragment, my all data goes, so I am trying to store it in preferences but preference don't allow to access ArrayList, following is my code
public class Add_to_cart extends Fragment {
private Button continue_shopping;
private Button checkout;
ListView list;
private TextView _decrease,mBTIncrement,_value;
private CustomListAdapter adapter;
private ArrayList<String> alst;
private ArrayList<String> alstimg;
private ArrayList<String> alstprc;
private String bname;
private ArrayList<String> alsttitle;
private ArrayList<String> alsttype;
public static ArrayList<String> static_Alst;
public Add_to_cart(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.list_view_addtocart, container, false);
alst=new ArrayList<String>();
alstimg=new ArrayList<String>();
Bundle bundle = this.getArguments();
alst = bundle.getStringArrayList("prducts_id");
alsttype = bundle.getStringArrayList("prducts_type");
alstimg=bundle.getStringArrayList("prducts_imgs");
alsttitle=bundle.getStringArrayList("prducts_title");
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
System.out.println("TEst--" + alst);
// Toast.makeText(getActivity(),"Testing"+alstimg,Toast.LENGTH_LONG).show();
list=(ListView)rootView.findViewById(R.id.list_addtocart);
adapter = new CustomListAdapter(getActivity(),alst,alstimg,alsttitle,alsttype);
list.setAdapter(adapter);
adapter.notifyDataSetChanged();
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
// TODO Auto-generated method stub
}
});
return rootView;
}
public class CustomListAdapter extends BaseAdapter {
private Context context;
private ArrayList<String> listData;
private ArrayList<String> listDataimg;
private ArrayList<String> listDatatitle;
private ArrayList<String> listDatatype;
private AQuery aQuery;
String dollars="\u0024";
public CustomListAdapter(Context context,ArrayList<String> listData,ArrayList<String> listDataimg,ArrayList<String> listDatatitle,ArrayList<String> listDatatype) {
this.context = context;
this.listData=listData;
this.listDataimg=listDataimg;
this.listDatatitle=listDatatitle;
this.listDatatype=listDatatype;
aQuery = new AQuery(this.context);
}
public void save_User_To_Shared_Prefs(Context context) {
SharedPreferences appSharedPrefs = PreferenceManager
.getDefaultSharedPreferences(context.getApplicationContext());
SharedPreferences.Editor prefsEditor = appSharedPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(listData);
Add_to_cart.static_Alst=listData;
prefsEditor.putString("user", json);
prefsEditor.commit();
}
#Override
public int getCount() {
return listData.size();
}
#Override
public Object getItem(int position) {
return listData.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(getActivity()).inflate(R.layout.list_item_addtocart, null);
holder.propic = (ImageView) convertView.findViewById(R.id.img_addtocart);
holder.txtproname = (TextView) convertView.findViewById(R.id.proname_addtocart);
holder.txtprofilecast = (TextView) convertView.findViewById(R.id.proprice_addtocart);
holder.txtsize = (TextView) convertView.findViewById(R.id.txt_size);
_decrease = (TextView) convertView.findViewById(R.id.minuss_addtocart);
mBTIncrement = (TextView) convertView.findViewById(R.id.plus_addtocart);
_value = (EditText)convertView.findViewById(R.id.edt_procount_addtocart);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
mBTIncrement.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
increment();
}
});
_decrease.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
decrement();
}
});
holder.txtprofilecast.setText(dollars+listData.get(position));
holder.txtproname.setText(listDatatitle.get(position));
holder.txtsize.setText(listDatatype.get(position));
System.out.println("Image ka array " + listDataimg.get(position));
//Picasso.with(mContext).load(mThumbIds[position]).centerCrop().into(imageView);
// Picasso.with(context).load(listDataimg.get(position)).into(holder.propic);
aQuery.id(holder.propic).image(listDataimg.get(position), true, true, 0, R.drawable.ic_launcher);
return convertView;
}
class ViewHolder{
ImageView propic;
TextView txtproname;
TextView txtprofilecast;
TextView txtsize;
}
}
}

Complete example of storing and retrieving arraylist in sharedpreference:http://blog.nkdroidsolutions.com/arraylist-in-sharedpreferences/
public void storeFavorites(Context context, List favorites) {
// used for store arrayList in json format
SharedPreferences settings;
Editor editor;
settings = context.getSharedPreferences(PREFS_NAME,Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonFavorites = gson.toJson(favorites);
editor.putString(FAVORITES, jsonFavorites);
editor.commit();
}
public ArrayList loadFavorites(Context context) {
// used for retrieving arraylist from json formatted string
SharedPreferences settings;
List favorites;
settings = context.getSharedPreferences(PREFS_NAME,Context.MODE_PRIVATE);
if (settings.contains(FAVORITES)) {
String jsonFavorites = settings.getString(FAVORITES, null);
Gson gson = new Gson();
BeanSampleList[] favoriteItems = gson.fromJson(jsonFavorites,BeanSampleList[].class);
favorites = Arrays.asList(favoriteItems);
favorites = new ArrayList(favorites);
} else
return null;
return (ArrayList) favorites;
}
public void addFavorite(Context context, BeanSampleList beanSampleList) {
List favorites = loadFavorites(context);
if (favorites == null)
favorites = new ArrayList();
favorites.add(beanSampleList);
storeFavorites(context, favorites);
}
public void removeFavorite(Context context, BeanSampleList beanSampleList) {
ArrayList favorites = loadFavorites(context);
if (favorites != null) {
favorites.remove(beanSampleList);
storeFavorites(context, favorites);
}
}

Use tinydb. check following link you might get some idea.
https://github.com/kcochibili/TinyDB--Android-Shared-Preferences-Turbo
using tinydb you can store array in local db.

You can use gson:
To Save Preferences:
public void save_User_To_Shared_Prefs(Context context, List<User> users) {
SharedPreferences settings;
Editor editor;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonUsers = gson.toJson(users);
editor.putString(USERS, jsonUsers);
editor.commit();
}
To get Preferences:
public ArrayList<User> getUsers(Context context) {
SharedPreferences settings;
List<User> users;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
if (settings.contains(USERS)) {
String jsonUsers = settings.getString(USERS, null);
Gson gson = new Gson();
User[] userItems = gson.fromJson(jsonUsers,
User[].class);
users = Arrays.asList(userItems);
users= new ArrayList<User>(users);
} else
return null;
return (ArrayList<User>) users;
}
To add user:
public void addUser(Context context, User user) {
List<Product> favorites = getUsers(context);
if (users == null)
users = new ArrayList<User>();
users.add(user);
save_User_To_Shared_Prefs(context, users);
}

First download Gson.jar from below link and then add it to libs folder of your project
http://www.java2s.com/Code/Jar/g/Downloadgson17jar.htm
then put That ArrayList in the Class and make object of that class then you can save that object to SharedPreferences like below
public static void save_User_To_Shared_Prefs(Context context, User _USER) {
SharedPreferences appSharedPrefs = PreferenceManager
.getDefaultSharedPreferences(context.getApplicationContext());
SharedPreferences.Editor prefsEditor = appSharedPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(_USER);
prefsEditor.putString("user", json);
prefsEditor.commit();
}
above code is an example _USER objext contain ArrayList.
And to read the object have a look at below code
public static User get_User_From_Shared_Prefs(Context context) {
SharedPreferences appSharedPrefs = PreferenceManager
.getDefaultSharedPreferences(context.getApplicationContext());
Gson gson = new Gson();
String json = appSharedPrefs.getString("user", "");
User user = gson.fromJson(json, User.class);
return user;
}
now when you want to get the _USER object call the above function and in result you will have the object and in that you will have the ArrayList

An alternative solution (just thought of it):
If you have an array called addtos and you want to add the array to shared preferences, since the variable is represented in the dictionary as a String, you could append the array index to the end of that string.
e.g -
Storing
for(int i = 0; i<addtos.size(); i++)
prefsEditor.putString("addtos"+i, addtos.get(i));
Receiving
int i = 0;
while(true){
if(prefs.getString("addtos"+i, "")!=""){ // or whatever the default dict value is
// do something with it
i++;
}else{break;}
}
Seems ok to me, if anyone sees a problem with this, let me know.
Also, no need for ArrayLists

how to remove list item or clearing listview using shared preferences?

I have following base adapter custom class, creating listview and items. but i want to remove all items from the list when I click reset button.
My code :
public class Scores extends Activity implements OnClickListener {
public static final String MY_PREFS_NAME = "PrefName";
SharedPreferences pref;
static String[] tempTime = new String[10];
static String[] tempScore = new String[10];
private static class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public EfficientAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return tempTime.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(
R.layout.mathmatch_score_format, null);
holder = new ViewHolder();
holder.text1 = (TextView) convertView
.findViewById(R.id.time_text);
holder.text2 = (TextView) convertView
.findViewById(R.id.score_text);
/*final ImageView deleteButton = (ImageView)
convertView.findViewById(R.id.score_reset);
deleteButton.setOnClickListener(this);*/
convertView.setTag(holder);
//deleteButton.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.text1.setText(tempTime[position]);
holder.text2.setText(tempScore[position]);
return convertView;
}
static class ViewHolder {
TextView text1;
TextView text2;
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mathmatch_score);
setUpViews();
pref = getSharedPreferences(MY_PREFS_NAME, 0);
strTime = pref.getString("high_score_times", "");
intScore = pref.getString("high_score_values", "");
tempTime = strTime.split(",");
tempScore = intScore.split(",");
Comparator<String> comparator = new CustomArrayComparator<String, String>(tempScore, tempTime);
Arrays.sort(tempTime, comparator);
Arrays.sort(tempScore, Collections.reverseOrder());
lv.setAdapter(new EfficientAdapter(this));
}
private void setUpViews() {
lv = (ListView) findViewById(R.id.list);
reset = (ImageView) findViewById(R.id.score_reset);
reset.setOnClickListener(this);
}
#Override
protected void onPause() {
super.onPause();
pref = getSharedPreferences(MY_PREFS_NAME, 0);
SharedPreferences.Editor edit = pref.edit();
edit.putString("high_score_times", strTime);
edit.putString("high_score_values", intScore);
edit.commit();
}
#Override
protected void onStop() {
super.onStop();
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.score_reset:
AlertDialog.Builder alertbox = new AlertDialog.Builder(this);
alertbox.setTitle("Reset");
alertbox.setMessage("Are you sure all time ans score are reset?");
alertbox.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
pref = getSharedPreferences(MY_PREFS_NAME, 0);
SharedPreferences.Editor edit = pref.edit();
/*edit.remove("high_score_times");
edit.remove("high_score_values");*/
/*edit.remove(intScore);
edit.remove(strTime);
*/
//edit.clear();
edit.remove(MY_PREFS_NAME);
edit.commit();
}
});
alertbox.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(getApplicationContext(), "'No' button clicked", Toast.LENGTH_SHORT).show();
}
});
alertbox.show();
break;
default:
break;
}}}
My reset button is not including on a list.
I have tried this in yes button click event in above code but could not get any update. So what to do?
Thanks in advance.

using your listview instance get the list adapter like
urlist.setAdapter("pass your updated adapter with empty string array");
OR
you can also call notifyDataSetChanged(); to tell the list view that its data set is changed

For a start, your using your adapter wrong. Your adapter should be a wrapper around your data, not a facade used to expose data contained elsewhere in your code.
In your case your using it to access the two variables (very bad form to make these static):
static String[] tempTime = new String[10];
static String[] tempScore = new String[10];
On create your filling these variables from your shared preferences.
Then on your "Yes" your updating your preferences but no matter how much you press the "update" button on your adapter, it's still looking at those variables which haven't been updated.
If you want your "Yes" button to clear your list then you need to change the data which backs the adapter then tell the adapter that it has changed and to redraw itself.
alertbox.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
pref = getSharedPreferences(MY_PREFS_NAME, 0);
SharedPreferences.Editor edit = pref.edit();
/**/
edit.remove(MY_PREFS_NAME);
edit.commit();
strTime = pref.getString("high_score_times", "");
intScore = pref.getString("high_score_values", "");
tempTime = strTime.split(",");
tempScore = intScore.split(",");
EfficientAdapter adapter = (EfficientAdapter)lv.getAdapter();
adapter.notifyDataSetChanged();
});

To clear List:
set tempTime and tempScore to empty array
tempTime= new String[0];
adapter.notifyDataSetChanged();
To Add/Remove Data :
Alter data source tempTime and tempScore accordingly and call adapter.notifyDataSetChanged();