Develop Reference

How to fetch link from json and connect it to button?

I am working with a project and I am trying to fetch some link from a json data and I want to connect the link with a button in my recycleview so that whenever the button is clicked, it'll automatically connet to the respective websites. I gave user permission to interner in Manifest. So, How to connect it?
package com.example.covidcuretemplate1;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private RequestQueue requestQueue;
private ExampleAdapter exampleAdapter;
private ArrayList<ExampleItem> exampleList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this, RecyclerView.HORIZONTAL,false));
exampleList = new ArrayList<>();
requestQueue = Volley.newRequestQueue(this);
parseJSON();
}
private void parseJSON() {
String url = "https://newsapi.org/v2/top-headlines?country=in&category=health&apiKey=*************************";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("articles");
for(int i = 0; i < jsonArray.length(); i++)
{
JSONObject article = jsonArray.getJSONObject(i);
if(article.isNull("description") || article.isNull("urlToImage")) {
continue;
}
if(article.getString("description").isEmpty() || article.getString("urlToImage").isEmpty())
continue;
String title = article.getString("title");
String description = article.getString("description");
String date = article.getString("publishedAt");
String imageurl = article.getString("urlToImage");
//How to connect this??????
String newsurl = article.getString("url");
exampleList.add(new ExampleItem(imageurl,title,description,date));
}
exampleAdapter = new ExampleAdapter(MainActivity.this,exampleList);
recyclerView.setAdapter(exampleAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
requestQueue.add(request);
}
}
My Adapter class, Here can anybody suggest anything in the place of toast? The Toast is working fine !!!
public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
public Context mcontext;
public ArrayList<ExampleItem> marrayList;
public ExampleAdapter(Context mcontext, ArrayList<ExampleItem> marrayList) {
this.mcontext = mcontext;
this.marrayList = marrayList;
}
#NonNull
#Override
public ExampleViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mcontext).inflate(R.layout.card_item,parent,false);
ExampleViewHolder exampleViewHolder = new ExampleViewHolder(view);
return exampleViewHolder;
}
#Override
public void onBindViewHolder(#NonNull ExampleViewHolder holder, int position) {
ExampleItem examplItem = marrayList.get(position);
String imageurl = examplItem.getMimgurl();
String title = examplItem.getMtitle();
String description = examplItem.getMdescription();
String date = examplItem.getMdate();
/////////////
final String newsurl = examplItem.getMurl();
////////////
holder.textview_title.setText(title);
holder.textview_description.setText(description);
holder.textview_date.setText(date);
Glide.with(mcontext).load(imageurl).into(holder.imageview_news);
///////////////////////////
holder.button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//////////////////////////////////NEED HELP!!!!!!!!!!!!!!!!!!/////////
Toast.makeText(mcontext,newsurl,Toast.LENGTH_LONG).show();
}
});
//////////////////////////
}
#Override
public int getItemCount() {
return marrayList.size();
}
public static class ExampleViewHolder extends RecyclerView.ViewHolder{
public ImageView imageview_news;
public TextView textview_title;
public TextView textview_description;
public TextView textview_date;
///////////////////////////
public Button button;
///////////////////////////
public ExampleViewHolder(#NonNull View itemView) {
super(itemView);
imageview_news = itemView.findViewById(R.id.imageview_news);
textview_title = itemView.findViewById(R.id.textview_title);
textview_description = itemView.findViewById(R.id.textview_description);
textview_date = itemView.findViewById(R.id.textview_date);
/////////////////////////
button = itemView.findViewById(R.id.button);
////////////////////////
}
}
}

Try to set intent for the website inside the onClickListener. Something like this:
Button button= findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String url = "http://www.YourWebsite.com"; //insert the link you prase
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
startActivity(intent);
}
});

You can use this code inside onClickListener to open it in the browser.
Uri uri = Uri.parse(newsurl);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);

GridView Always Scroll To The Top After Success Load Next Page

I face a difficulty when working using recyclerview and Gridview. The problem is when my application success load next page (next data), the recyclerview always back to the top.
I want the recyclerview start from last index.
Example : First page load 10 items, after success loan next page, the recycler view start scrolling from item 8.
For resolve that problem, i have tried all the solution on stackoverflow still get nothing.
Here are my code :
package com.putuguna.sitehinduapk.adapters;
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.putuguna.sitehinduapk.R;
import com.putuguna.sitehinduapk.activities.DetailBlogPostActivity;
import com.putuguna.sitehinduapk.models.listposts.ItemPostModel;
import com.putuguna.sitehinduapk.utils.GlobalFunction;
import com.putuguna.sitehinduapk.utils.GlobalVariable;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public abstract class ListPostAdapter extends RecyclerView.Adapter<ListPostAdapter.ViewHolder>{
private List<ItemPostModel> mListPost;
private Context mContext;
public ListPostAdapter(List<ItemPostModel> mListPost, Context mContext) {
this.mListPost = mListPost;
this.mContext = mContext;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(mContext);
View view = inflater.inflate(R.layout.adapter_item_list_post, null);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, final int position) {
final ItemPostModel post = mListPost.get(position);
List<String> listURL = extractUrls(post.getContentPosting());
Glide.with(mContext)
.load(listURL.get(0))
.into(holder.ivImagePost);
holder.tvTitle.setText(post.getTitle());
holder.llItemPost.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//TO DO OnClick
}
});
List<String> listLabel = post.getListLabel();
String labelPost="";
for(int i=0; i<listLabel.size();i++){
labelPost += "#"+listLabel.get(i) + " ";
}
holder.tvLabel.setText(labelPost);
if ((position >= getItemCount() - 1))
load();
}
public abstract void load();
#Override
public int getItemCount() {
return mListPost.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder{
public ImageView ivImagePost;
public TextView tvTitle;
public LinearLayout llItemPost;
public TextView tvLabel;
public ViewHolder(View itemView) {
super(itemView);
ivImagePost = (ImageView) itemView.findViewById(R.id.iv_image_post);
tvTitle = (TextView) itemView.findViewById(R.id.tv_blog_title);
llItemPost = (LinearLayout) itemView.findViewById(R.id.ll_item_post);
tvLabel = (TextView) itemView.findViewById(R.id.textview_label_adapter);
}
}
public static List<String> extractUrls(String input) {
List<String> result = new ArrayList<String>();
Pattern pattern = Pattern.compile(
"\\b(((ht|f)tp(s?)\\:\\/\\/|~\\/|\\/)|www.)" +
"(\\w+:\\w+#)?(([-\\w]+\\.)+(com|org|net|gov" +
"|mil|biz|info|mobi|name|aero|jobs|museum" +
"|travel|[a-z]{2}))(:[\\d]{1,5})?" +
"(((\\/([-\\w~!$+|.,=]|%[a-f\\d]{2})+)+|\\/)+|\\?|#)?" +
"((\\?([-\\w~!$+|.,*:]|%[a-f\\d{2}])+=?" +
"([-\\w~!$+|.,*:=]|%[a-f\\d]{2})*)" +
"(&(?:[-\\w~!$+|.,*:]|%[a-f\\d{2}])+=?" +
"([-\\w~!$+|.,*:=]|%[a-f\\d]{2})*)*)*" +
"(#([-\\w~!$+|.,*:=]|%[a-f\\d]{2})*)?\\b");
Matcher matcher = pattern.matcher(input);
while (matcher.find()) {
result.add(matcher.group());
}
return result;
}
}
This code of MainActivity.java
private void getListPost(){
mSwipeRefreshLayout.setRefreshing(true);
String nextPageToken = GlobalFunction.getStrings(this, GlobalVariable.keySharedPreference.TOKEN_PAGINATION);
BloggerApiService apiService = BloggerApiClient.getClient().create(BloggerApiService.class);
Call<ListPostModel> call = apiService.getListPost(GlobalVariable.APP_KEY_V3);
call.enqueue(new Callback<ListPostModel>() {
#Override
public void onResponse(Call<ListPostModel> call, Response<ListPostModel> response) {
ListPostModel listpost = response.body();
initDataView(listpost);
mSwipeRefreshLayout.setRefreshing(false);
}
#Override
public void onFailure(Call<ListPostModel> call, Throwable t) {
mSwipeRefreshLayout.setRefreshing(false);
Toast.makeText(MainActivity.this, t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
/**
* this method used for post (next page)
*/
private void getNextListPost(){
mSwipeRefreshLayout.setRefreshing(true);
String nextPageToken = GlobalFunction.getStrings(this, GlobalVariable.keySharedPreference.TOKEN_PAGINATION);
BloggerApiService apiService = BloggerApiClient.getClient().create(BloggerApiService.class);
Call<ListPostModel> call = apiService.getNexPageListPost(GlobalVariable.APP_KEY_V3,nextPageToken);
call.enqueue(new Callback<ListPostModel>() {
#Override
public void onResponse(Call<ListPostModel> call, Response<ListPostModel> response) {
ListPostModel listpost = response.body();
initDataView2(listpost);
mSwipeRefreshLayout.setRefreshing(false);
}
#Override
public void onFailure(Call<ListPostModel> call, Throwable t) {
mSwipeRefreshLayout.setRefreshing(false);
Toast.makeText(MainActivity.this, t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
#Override
public void onRefresh() {
mListPost.clear();
getListPost();
}
private void initDataView(ListPostModel listpost){
GlobalFunction.saveString(this,GlobalVariable.keySharedPreference.TOKEN_PAGINATION, listpost.getNextPageToken());
mListPost.addAll(listpost.getListItemsPost());
mPostAdapter = new ListPostAdapter(mListPost, this) {
#Override
public void load() {
ItemPostModel item = mListPost.get(mListPost.size()-1);
getNextListPost();
}
};
mRecyclerviewPost.setAdapter(mPostAdapter);
//mPostAdapter.notifyDataSetChanged();
mRecyclerviewPost.setHasFixedSize(true);
mGridViewLayoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
mGridViewLayoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE);
mRecyclerviewPost.setLayoutManager(mGridViewLayoutManager);
}
/**
* this method used for set view (next page)
* #param listpost
*/
private void initDataView2(ListPostModel listpost){
GlobalFunction.saveString(this,GlobalVariable.keySharedPreference.TOKEN_PAGINATION, listpost.getNextPageToken());
final String nextPageToken = GlobalFunction.getStrings(this, GlobalVariable.keySharedPreference.TOKEN_PAGINATION);
List<ItemPostModel> itemNextPost = listpost.getListItemsPost();
// itemNextPost.addAll(mListPost);
mListPost.addAll(itemNextPost);
mPostAdapter = new ListPostAdapter(mListPost, this) {
#Override
public void load() {
ItemPostModel item = mListPost.get(mListPost.size()-1);
if(nextPageToken==null){
}else{
getNextListPost();
}
}
};
mRecyclerviewPost.setAdapter(mPostAdapter);
mRecyclerviewPost.setHasFixedSize(true);
mGridViewLayoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
mGridViewLayoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE);
mRecyclerviewPost.setLayoutManager(mGridViewLayoutManager);
an
}
Any suggestion will be appreciated.

The problem with the code is, your resetting the complete data again into your adapter and setting it to RecyclerView again, That's why it is re instanced everything in RecyclerView and i.e scrolling to top. Instead of that you can try something like just add /append the updated data into the list ( where you holds the data ) and then just call the adapter.notifyDataSetChanged(); method. automatically it will add the updated data and you no need to set the recycler view again.
Probably for your case you need to change your initDataView2() mehtod like below
private void initDataView2(ListPostModel listpost){
GlobalFunction.saveString(this,GlobalVariable.keySharedPreference.TOKEN_PAGINATION, listpost.getNextPageToken());
mListPost.addAll(listpost.getListItemsPost());\
mPostAdapter .notifyDataSetChanged();
}
For nextPageToken thing you can move into your main code onCreate() or the initDataView() method where you already have the adapter initialization
like this,
private void initDataView(ListPostModel listpost){
GlobalFunction.saveString(this,GlobalVariable.keySharedPreference.TOKEN_PAGINATION, listpost.getNextPageToken());
final String nextPageToken = GlobalFunction.getStrings(this, GlobalVariable.keySharedPreference.TOKEN_PAGINATION);
mListPost.addAll(listpost.getListItemsPost());
mPostAdapter = new ListPostAdapter(mListPost, this) {
#Override
public void load() {
ItemPostModel item = mListPost.get(mListPost.size()-1);
if(nextPageToken==null){
}else{
getNextListPost();
}
}
};
mRecyclerviewPost.setAdapter(mPostAdapter);
//mPostAdapter.notifyDataSetChanged();
mRecyclerviewPost.setHasFixedSize(true);
mGridViewLayoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
mGridViewLayoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE);
mRecyclerviewPost.setLayoutManager(mGridViewLayoutManager);
}
I hope it will work :)

Put 2 columns of recycler view every row

I would like to put 2 columns of recyclerview every row.
Right now my design is like this:
and i would like to put 2 so the scroll is not to long.
I have this view inside a fragment and I use a recyclerview adapter but I have no clue how to tell it to use its parent with, so it can fill the width of the screen. In the fragment I recive a JSON from an online database using an AsyncTask and fill in the recyclerview on the onPostExecute of the AsyncTask.
If anyone has any Idea how i can do it, I can't seem to find this anywhere
Thx!
My recyclerview Adapter:
package com.example.juanfri.seguridadmainactivity;
/**
* Created by jlira on 30/05/2017.
*/
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
/**
* Created by Juanfri on 29/05/2017.
*/
public class RecyclerAdapterSerie extends RecyclerView.Adapter<RecyclerAdapterSerie.SerieHolder> {
private ArrayList<Serie> mSerie;
#Override
public RecyclerAdapterSerie.SerieHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View inflatedView = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.recyclerview_card, viewGroup, false);
return new SerieHolder(inflatedView);
}
#Override
public void onBindViewHolder(RecyclerAdapterSerie.SerieHolder holder, int i) {
Serie itemPhoto = mSerie.get(i);
holder.bindPhoto(itemPhoto);
}
#Override
public int getItemCount() {
return mSerie.size();
}
public RecyclerAdapterSerie(ArrayList<Serie> serie) {
mSerie = serie;
}
public static class SerieHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
//2
private ImageView mItemImage;
private TextView mItemDate;
private TextView mItemDescription;
private Serie serie;
//3
private static final String PHOTO_KEY = "PHOTO";
//4
public SerieHolder(View v) {
super(v);
mItemImage = (ImageView) v.findViewById(R.id.item_image);
mItemDate = (TextView) v.findViewById(R.id.item_date);
mItemDescription = (TextView) v.findViewById(R.id.item_description);
v.setOnClickListener(this);
}
//5
#Override
public void onClick(View v) {
/*Context context = itemView.getContext();
Intent showPhotoIntent = new Intent(context, Pelicula.class);
showPhotoIntent.putExtra(PHOTO_KEY, peli);
context.startActivity(showPhotoIntent);*/
}
public void bindPhoto(Serie mserie) {
serie = mserie;
String Nombre = mserie.getNombreSerie();
if(Nombre.length() >= 25)
{
Nombre = Nombre.substring(0,22);
Nombre = Nombre + "...";
}
Picasso.with(mItemImage.getContext()).load(mserie.getPoster()).into(mItemImage);
mItemDate.setText(Nombre);
mItemDescription.setText(Integer.toString(mserie.getIdTMDB()));
}
}
}
My fragment (where i create the recyclerview)
package com.example.juanfri.seguridadmainactivity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import static android.content.ContentValues.TAG;
/**
* Created by jlira on 06/06/2017.
*/
public class FragmentoSeriesPelis extends Fragment {
public final String API = "5e2780b2117b40f9e4dfb96572a7bc4d";
public final String URLFOTO ="https://image.tmdb.org/t/p/original/";
private ProgressDialog pDialog;
private RecyclerView recyclerView;
private LinearLayoutManager mLinearLayoutManager;
private ArrayList<Serie> series;
private ArrayList<Pelicula> Pelis;
private RecyclerAdapterSerie mAdapterSerie;
private RecyclerAdapterPelicula mAdapterPeli;
private int pagina;
private String url;
private Button CargarMas;
private String tipo;
private int MaxPag;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.series_pelis_layout, container, false);
view.setTag(TAG);
Bundle args = getArguments();
series = new ArrayList<>();
Pelis = new ArrayList<>();
MaxPag = 2;
pagina = args.getInt("Page");
url = args.getString("url");
tipo = args.getString("Tipo");
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerViewSerieshoy);
//mLinearLayoutManagerSerie = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
//recyclerViewSerie.setLayoutManager(mLinearLayoutManagerSerie);
//mAdapterSerie = new RecyclerAdapterSerie(seriesHoy);
//recyclerViewSerie.setAdapter(mAdapterSerie);
new GetSeriesHoy().execute();
CargarMas = (Button) view.findViewById(R.id.buttonCargarMas);
CargarMas.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
if(pagina+1<=MaxPag)
{
pagina++;
new GetSeriesHoy().execute();
}
else
{
Toast.makeText(getActivity(), "No hay mas resultados", Toast.LENGTH_LONG).show();
}
}
});
return view;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getActivity().setTitle("Series de Hoy");
}
private class GetSeriesHoy extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
//url = "https://api.themoviedb.org/3/tv/airing_today?api_key="+API+"&language=en-US&page="+pagina;
String aux = url+pagina;
String jsonStr = sh.makeServiceCall(aux);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
MaxPag = jsonObj.getInt("total_pages");
JSONArray contacts = jsonObj.getJSONArray("results");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
int IdSerie = i;
int idTMDB = c.getInt("id");
String nombreSerie;
String poster =URLFOTO + c.getString("poster_path");
if(tipo.equalsIgnoreCase("Series"))
{
nombreSerie = c.getString("name");
Serie nuevo = new Serie();
nuevo.setIdSerie(IdSerie);
nuevo.setNombreSerie(nombreSerie);
nuevo.setIdTMDB(idTMDB);
nuevo.setPoster(poster);
series.add(nuevo);
}
else
{
nombreSerie = c.getString("title");
Pelicula nuevo = new Pelicula();
nuevo.setIdPelicula(IdSerie);
nuevo.setNombrePelicula(nombreSerie);
nuevo.setIdTMDB(idTMDB);
nuevo.setPoster(poster);
Pelis.add(nuevo);
}
}
} catch (final JSONException e) {
Toast.makeText(getActivity(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
} else {
Toast.makeText(getActivity(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
//Aqui Realizar la RecycleView BuildUp
if(tipo.equalsIgnoreCase("Series"))
{
mLinearLayoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(mLinearLayoutManager);
mAdapterSerie = new RecyclerAdapterSerie(series);
recyclerView.setAdapter(mAdapterSerie);
}else
{
mLinearLayoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(mLinearLayoutManager);
mAdapterPeli = new RecyclerAdapterPelicula(Pelis);
recyclerView.setAdapter(mAdapterPeli);
}
}
}
}

Replace your LinearLayoutManager for a GridLayoutManager like this:
private GridLayoutManager mGridLayoutManager;
// ...
mGridLayoutManager = new GridLayoutManager(getActivity(), 2);
Then you can use it the same way as the LinearLayoutManager.

RecyclerView does not update or refresh when calling notifyDataSetChanged()

I have an app that uses RecyclerView. When user selects "Add New Row" from the options menu, I output a test message to the screen, and some values get appended to two different ArrayLists. That part is working great, as I have confirmed these values are successfully added by looking at the ArrayList values using the debugger.
Anyhow I am not able to get the RecyclerView to redraw the screen and show the new information. My attempt to redraw / update the screen is by using this code (line 78 of MainActivity.java):
//call notify data set changed method for the adapter
adapter.notifyDataSetChanged();
Maybe I am not calling notifyDataSetChanged on the same adapter that actually is used for RecycleView??
Here is the complete code for MainActivity.java (see options menu code at end):
package com.joshbgold.ironmax;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static final int ADD_ROW = 1; //used for case statement statement to select menu item
private RecyclerView recyclerView;
public Exercises exercises = new Exercises();
public ExerciseRow adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
assert getSupportActionBar() != null;
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setIcon(R.mipmap.barbell);
actionBar.setTitle(" " + "Iron Max");
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
//ExerciseRow adapter = new ExerciseRow(this);
adapter = new ExerciseRow(this);
recyclerView.setAdapter(adapter);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
/* MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.add_row, menu);
return super.onCreateOptionsMenu(menu);*/
menu.add(0, ADD_ROW, 0, "Add New Row");
menu.getItem(0).setIcon(R.drawable.plus);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
menu.getItem(0).setIcon(R.drawable.plus);
return super.onPrepareOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int length;
switch (item.getItemId()) {
case 1:
Toast msg = Toast.makeText(MainActivity.this, "Test code for adding an exercise", Toast.LENGTH_LONG);
msg.show();
exercises.addExercise("Some exercise");
exercises.addPersonalBest(500);
length = exercises.getExercisesArrayLength();
//call notify data set changed method for the adapter
adapter.notifyItemInserted(length - 1);
adapter.notifyDataSetChanged();
return super.onOptionsItemSelected(item);
default:
return super.onOptionsItemSelected(item);
}
}
}
Here is Exercises.java:
import android.support.v7.app.AppCompatActivity;
import java.util.ArrayList;
public class Exercises extends AppCompatActivity {
public ArrayList<String> exercisesArrayList = new ArrayList<>(); //stores all the lifts
private ArrayList<Integer> personalBestsArrayList = new ArrayList<>(); //stores personal bests in pounds
public ArrayList<String> getExercisesArray() { //returns the whole exercises arraylist
return exercisesArrayList;
}
public ArrayList<Integer> getPersonalBests() { //returns the whole personal bests arraylist
return personalBestsArrayList;
}
public String getExercise(int position) { //returns individual exercise from array
return exercisesArrayList.get(position);
}
public void addExercise(String exercise) {
exercisesArrayList.add(exercise);
}
public void removeExercise(int position) {
exercisesArrayList.remove(position);
}
public void editExercise(int position, String exercise) {
exercisesArrayList.set(position, exercise);
}
public int getExercisesArrayLength() {
return exercisesArrayList.size();
}
public Integer getPersonalBest(int position) { //returns individual personal best from array
return personalBestsArrayList.get(position);
}
public void addPersonalBest(int personalBest) {
personalBestsArrayList.add(personalBest);
}
public void removePersonalBest(int position) {
personalBestsArrayList.remove(position);
}
public void editPersonalBest(int position, int personalBest) {
personalBestsArrayList.set(position, personalBest);
}
public Exercises() {} //constructor
}
Here is ExerciseRow.java:
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class ExerciseRow extends RecyclerView.Adapter<ExerciseRow.ExerciseViewHolder> {
String exerciseName = "burpee";
String exercisePR = "100"; // user's personal record for this exercise in pounds
private Context context;
Exercises exercises = new Exercises();
public ExerciseRow(Context context) {
this.context = context;
}
#Override
public ExerciseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.exercise_list_item, parent, false);
return new ExerciseViewHolder(view);
}
#Override
public void onBindViewHolder(ExerciseViewHolder holder, int position) {
ArrayList<String> exercisesArray = exercises.getExercisesArray();
holder.bindExercises(exercisesArray.get(position));
}
#Override
public int getItemCount() {
return exercises.getExercisesArrayLength();
}
public class ExerciseViewHolder extends RecyclerView.ViewHolder {
public TextView exerciseNameTextView;
public TextView personalRecordTextView;
public ImageView edit_Icon;
public ImageView percentages_Icon;
public ImageView trash_Icon;
public ImageView plus_icon;
public ImageView facebook_icon;
public ImageView twitter_icon;
public ExerciseViewHolder(View itemView) {
super(itemView);
exerciseNameTextView = (TextView) itemView.findViewById(R.id.list_item_exercise_textview);
personalRecordTextView = (TextView) itemView.findViewById(R.id.list_item_amount_textview);
edit_Icon = (ImageView) itemView.findViewById(R.id.list_item_pencil);
percentages_Icon = (ImageView) itemView.findViewById(R.id.list_item_percent);
trash_Icon = (ImageView) itemView.findViewById(R.id.list_item_trash);
plus_icon = (ImageView) itemView.findViewById(R.id.list_item_plus);
facebook_icon = (ImageView) itemView.findViewById(R.id.list_item_facebook);
twitter_icon = (ImageView) itemView.findViewById(R.id.list_item_twitter);
View.OnClickListener plus = new View.OnClickListener() {
#Override
public void onClick(View view) {
// allow user to add a new exercise and personal best
exercises.addExercise("Some exercise");
exercises.addPersonalBest(500);
notifyDataSetChanged();
}
};
View.OnClickListener edit = new View.OnClickListener() {
#Override
public void onClick(View view) {
int position = getLayoutPosition(); //use getAdapterPosition() if getLayoutPosition causes a problem
if (position == 0) { //prevent user from deleting the first row.
Toast.makeText(context, "Sorry, example row cannot be edited.", Toast.LENGTH_LONG).show();
}
else{
editRow(position); //edit the row at the current position
notifyDataSetChanged();
}
}
};
View.OnClickListener percentages = new View.OnClickListener() {
#Override
public void onClick(View view) {
//get exercise name
exerciseName = exerciseNameTextView.getText().toString();
exercisePR = personalRecordTextView.getText().toString();
//show percentages layout
startPercentagesActivity(exerciseName, exercisePR);
}
};
View.OnClickListener trash = new View.OnClickListener() {
#Override
public void onClick(View view) {
int position = getLayoutPosition(); //use getAdapterPosition() if getLayoutPosition causes a problem
if (position == 0) { //prevent user from deleting the first row.
Toast.makeText(context, "Sorry, example row cannot be deleted.", Toast.LENGTH_LONG).show();
} else {
exercises.removeExercise(position);
exercises.removePersonalBest(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, exercises.getExercisesArrayLength());
}
}
};
plus_icon.setOnClickListener(plus);
edit_Icon.setOnClickListener(edit);
percentages_Icon.setOnClickListener(percentages);
trash_Icon.setOnClickListener(trash);
}
public void bindExercises(String exercises) {
Exercises exercisesObject = new Exercises();
exerciseNameTextView.setText(exercisesObject.getExercise(getAdapterPosition()));
personalRecordTextView.setText((exercisesObject.getPersonalBest(getAdapterPosition())).toString() + " pounds");
}
}
private void startPercentagesActivity(String some_exercise, String personal_record) {
Intent intent = new Intent(context, PercentagesActivity.class);
intent.putExtra("exerciseName", some_exercise);
intent.putExtra("personalRecord", personal_record);
context.startActivity(intent);
}
protected void editRow(final int position) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
//text_entry is an Layout XML file containing two text field to display in alert dialog
final View textEntryView = layoutInflater.inflate(R.layout.text_entry, null);
final EditText liftName = (EditText) textEntryView.findViewById(R.id.liftNameEditText);
final EditText PersonalBestInPounds = (EditText) textEntryView.findViewById(R.id.personalBestEditText);
final AlertDialog.Builder alert = new AlertDialog.Builder(context);
alert.setIcon(R.mipmap.barbell)
.setTitle("Please make your changes:")
.setView(textEntryView)
.setPositiveButton("Save",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
//retrieve the user's input
String lift = liftName.getText().toString();
int personalBest = Integer.parseInt(PersonalBestInPounds.getText().toString());
//save the user's input to the appropriate arrays
exercises.editExercise(position, lift);
exercises.editPersonalBest(position, personalBest);
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
}
});
alert.show();
}
}
If you have read this far, I give you credit! Please understand I am completely new to RecyclerView, so whatever error(s) I have made could be something quite simple even.

The issue is that you have two different instances of ExercisesOne in MainActivity and another in ExerciseRow You are adding the data to the wrong one.
A few other things that may help you along your way.
Exercises Should not extend AppCompatActivity (or really anything as far as I can tell)
You should avoid saving a reference to the context (as you are doing in Exercises) it can great memory issues. Instead try one of the following.
A. Use the context to get the LayoutInflater in the constructor
B. Call parent.getContext() in onCreateViewHolder

Android ListView showing only first 4 items on repeat

I have a Fragment called User Management where I collect data from a server and display it in a ListView. It's also refreshable via SwipeRefreshLayout.
What happens is, if I get data on 1-4 users, it displays the data correctly. However, if I get data on more than 4 users, it displays the first 4 correctly, and instead of the fifth, it's the first one again, instead of the 6th, it's the second one and so on and so on.
I've tried everything I could think of, the adapter is getting the data correctly, the ListView is getting the adapter correctly, but for some reason, it peaks at 4 users displayed, and simply repeats them after that (the funny thing is, if I add a user and then refresh, it simply repeats the next user one more time in the list, so it's definitely aware of the change in user number)
Can you help me finding the problem?
The java class:
package com.softwarenation.jetfuel.fragments.userManagement;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.ListFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.VolleyError;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.softwarenation.jetfuel.R;
import com.softwarenation.jetfuel.activities.MainActivity;
import com.softwarenation.jetfuel.fragments.Stations;
import com.softwarenation.jetfuel.managers.JetfuelManager;
import com.softwarenation.jetfuel.managers.StatusManager;
import com.softwarenation.jetfuel.managers.UserManager;
import com.softwarenation.jetfuel.utility.Global;
import com.softwarenation.jetfuel.utility.GlobalConnection;
import com.softwarenation.jetfuel.utility.users.User_pictures;
import com.softwarenation.jetfuel.utility.users.Users_mana;
import org.nicktate.projectile.Method;
import org.nicktate.projectile.Projectile;
import org.nicktate.projectile.StringListener;
import java.io.InputStream;
import java.util.ArrayList;
public class UserManagement extends Fragment {
private SwipeRefreshLayout swipeRefreshLayout;
//private View refreshView;
private Global font = new Global();
private ListView listView;
private ArrayList<User_pictures> pictureses = new ArrayList<User_pictures>();
private static boolean isfirst = false;
private PullToRefreshListView pullToRefreshView;
/**---------------------------------------------------------------------------------------------*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
/**---------------------------------------------------------------------------------------------*/
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_usermanagemnet, container, false);
listView = (ListView)rootView.findViewById(R.id.list);
swipeRefreshLayout = (SwipeRefreshLayout)rootView.findViewById(R.id.swipe);
// refreshView = (View) rootView.findViewById(R.id.swipe);
//First time, we get the data from a server, then only display that data until the user calls for a refresh
if(!StatusManager.getInstance().getUsermStatus()){
UsersTask usersTask = new UsersTask();
usersTask.execute();
}else{
setContent();
}
Button addUser = (Button)rootView.findViewById(R.id.addUser_button);
addUser.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Fragment fragment = new AddUser();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
}
});
// Set a listener to be invoked when the list should be refreshed.
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
Log.e("start","onRefresh");
new GetDataTask().execute();
}
}
);
/* pullToRefreshView = (PullToRefreshListView)rootView.findViewById(R.id.pull_to_refresh_listview);
pullToRefreshView.bringToFront();
pullToRefreshView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener<ListView>() {
#Override
public void onRefresh(PullToRefreshBase<ListView> refreshView) {
// Do work to refresh the list here.
new GetDataTask().execute();
}
});*/
return rootView;
}
public void setOnRefreshListener (SwipeRefreshLayout.OnRefreshListener listener){
swipeRefreshLayout.setOnRefreshListener(listener);
}
public boolean isRefreshing(){
return swipeRefreshLayout.isRefreshing();
}
public void setRefreshing(boolean refreshing){
swipeRefreshLayout.setRefreshing(refreshing);
}
public SwipeRefreshLayout getSwipeRefreshLayout(){
return swipeRefreshLayout;
}
//on refresh, get new data from the server
private class GetDataTask extends AsyncTask<Void, Void, String[]> {
#Override
protected String[] doInBackground(Void... voids) {Log.e("start","GetDataTask");
UsersTask usersTask = new UsersTask();
usersTask.execute();
return new String[0];
}
#Override
protected void onPostExecute(String[] result) {
// Call onRefreshComplete when the list has been refreshed.
// pullToRefreshView.onRefreshComplete();
super.onPostExecute(result);
MainActivity.setBackDisabled(false);
Log.e("GetDataTask","completed");
}
}
private class SampleItem {
public String id;
public String title;
public String username;
public String groupName;
public int userPicture;
public int editPicture;
public int dPicture;
public String activated;
public SampleItem(String id, String title, String username, String groupName, int userPicture, int editPicture, int dPicture, String activated ) {
this.id = id;
this.title = title;
this.username = username;
this.groupName = groupName;
this.userPicture = userPicture;
this.editPicture = editPicture;
this.dPicture = dPicture;
this.activated = activated;
}
}
static class ViewHolder {
private String checkBox;
private RelativeLayout relativeLayout;
private LinearLayout linearLayout;
private RelativeLayout relativeLayout2;
public void setCheckBox(String checkBox) {
this.checkBox = checkBox;
}
public void setLinearLayout(LinearLayout linearLayout) {
this.linearLayout = linearLayout;
}
public void setRelativeLayout(RelativeLayout relativeLayout) {
this.relativeLayout = relativeLayout;
}
public void setRelativeLayout2(RelativeLayout relativeLayout2) {
this.relativeLayout2 = relativeLayout2;
}
public LinearLayout getLinearLayout() {
return linearLayout;
}
public RelativeLayout getRelativeLayout() {
return relativeLayout;
}
public RelativeLayout getRelativeLayout2() {
return relativeLayout2;
}
public RelativeLayout getCheckBox() {
return relativeLayout;
}
}
public class SampleAdapter extends ArrayAdapter<SampleItem> {
final ViewHolder holder = new ViewHolder();
public SampleAdapter(Context context) {
super(context, 0);
}
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_usermana, null);
ImageView userPicture = (ImageView)convertView.findViewById(R.id.userpicture);
userPicture.setImageDrawable(getResources().getDrawable(getItem(position).userPicture));
TextView title = (TextView)convertView.findViewById(R.id.user_name);
font.setFont(title, 3, getActivity());
title.setText(getItem(position).title);
TextView username = (TextView)convertView.findViewById(R.id.username);
font.setFont(username, 2, getActivity());
username.setText(getItem(position).username);
TextView groupname = (TextView)convertView.findViewById(R.id.groupName);
font.setFont(groupname, 2, getActivity());
groupname.setText(getItem(position).groupName);
ImageView useredit = (ImageView)convertView.findViewById(R.id.editbutton);
useredit.setImageDrawable(getResources().getDrawable(getItem(position).editPicture));
useredit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Bundle bundle = new Bundle();
bundle.putString("user_id", getItem(position).id);
Fragment fragment = new EditProfile();
fragment.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
}
});
/**---------------*/
ImageView userdelate = (ImageView)convertView.findViewById(R.id.deletebutton);
userdelate.setImageDrawable(getResources().getDrawable(getItem(position).dPicture));
holder.setLinearLayout((LinearLayout)convertView.findViewById(R.id.lin_show_profile));
//LinearLayout show = (LinearLayout)convertView.findViewById(R.id.lin_show_profile);
holder.getLinearLayout().setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Bundle bundle = new Bundle();
bundle.putString("user_id", getItem(position).id);
Fragment fragment = new ShowProfile();
fragment.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
}
});
//
holder.setRelativeLayout((RelativeLayout)convertView.findViewById(R.id.delate_user));
//RelativeLayout delete_user = (RelativeLayout)convertView.findViewById(R.id.delate_user);
holder.getRelativeLayout().setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
DialogStop("Are you sure?", getItem(position).username, getActivity(), getItem(position).id);
}
});
//
//holder.setCheckBox(getItem(position).activated);
//
/**---------------*/
//Red or Blue background
// RelativeLayout settings = (RelativeLayout)convertView.findViewById(R.id.settingsbutton);
holder.setRelativeLayout2((RelativeLayout) convertView.findViewById(R.id.settingsbutton));
//if(getItem(position).activated.equals("false")) {
if (getItem(position).activated.equals("false")) {
holder.getLinearLayout().setBackground(getResources().getDrawable(R.drawable.discrepancy_background_red));
holder.getRelativeLayout().setBackground(getResources().getDrawable(R.drawable.discrepancy_background_red));
holder.getRelativeLayout2().setBackground(getResources().getDrawable(R.drawable.discrepancy_background_red));
}
//holder.setCheckBox(getItem(position).activated);
convertView.setTag(holder);
} else {
convertView.getTag();
}
return convertView;
}
}
public void DialogStop(String title, String message,Context context, final String id){
new AlertDialog.Builder(context)
.setTitle(title)
.setMessage(message)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//dialog.cancel();
DeleteTask deleteTask = new DeleteTask();
deleteTask.execute(id);
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
private class DeleteTask extends AsyncTask<String, String, String>{
#Override
protected String doInBackground(String... params) {
String response = null;
try {
response = new GlobalConnection().DELETE( getString(R.string.apicdeleteuser) + params[0].toString() );
Log.v("response", response + "");
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
#Override
protected void onPostExecute(String response) {
Log.v("response", response + "");
}
}
private class UsersTask extends AsyncTask<String, Void, ArrayList<Users_mana>> {
#Override
protected ArrayList<Users_mana> doInBackground(String... strings) {
//Users_mana users = null;
String response = null;
ArrayList<Users_mana> users_manas = null;
try{Log.e("start","GET via GlobalConnection()");
response = new GlobalConnection().GET( getString(R.string.apiusers));
users_manas = new Gson().fromJson(response, new TypeToken<ArrayList<Users_mana>>(){}.getType());
Log.e("start","setUsers_mana");
UserManager.getInstance().setUsers_mana(users_manas);
}catch (Exception e){
Log.e("response error", e.getMessage().toString());
}
return users_manas;
}
#Override
protected void onPostExecute(ArrayList<Users_mana> response) {
if(!response.isEmpty()) {Log.e("start","setContent()");
setContent();
StatusManager.getInstance().setUsermStatus(true);
Log.e("UsermStatus:",String.valueOf(StatusManager.getInstance().getUsermStatus()));
}
super.onPostExecute(response);
}
}
private void setContent(){
SampleAdapter adapter = new SampleAdapter(getActivity());
adapter.notifyDataSetChanged();
try {
if (!UserManager.getInstance().getUsers_mana().isEmpty()) {
for (int i = 0; i < UserManager.getInstance().getUsers_mana().size(); i++) {
Log.e("adding to adapter:",UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName + "" + UserManager.getInstance().getUsers_mana().get(i).id + "" + UserManager.getInstance().getUsers_mana().get(i).username + "group:" + UserManager.getInstance().getUsers_mana().get(i).group);
adapter.add(new SampleItem(
UserManager.getInstance().getUsers_mana().get(i).id
, UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName
, UserManager.getInstance().getUsers_mana().get(i).username
, UserManager.getInstance().getUsers_mana().get(i).group
, R.drawable.users_test
, R.drawable.settings
, R.drawable.delete
, UserManager.getInstance().getUsers_mana().get(i).activated
));
}
listView.setAdapter(adapter);Log.e("setting","ListView");
}
}catch (Exception e){
Log.e("error setContent", e.getMessage().toString());
}
}
/*
private class PicturesTask extends AsyncTask<String, String ,String>{
#Override
protected String doInBackground(String... urls) {
//String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
for(int i = 0; i < urls.length; i++) {
if(UserManager.getInstance().getUsers_mana().get(i).photo != null) {
InputStream in = new java.net.URL(getString(R.string.jetfuel_url ) + UserManager.getInstance().getUsers_mana().get(i).username).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
pictureses.add(new User_pictures(mIcon11, UserManager.getInstance().getUsers_mana().get(i).username, UserManager.getInstance().getUsers_mana().get(i).id));
UserManager.getInstance().setUserPictureses(pictureses);
}
}
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
if(!UserManager.getInstance().getUserPictureses().isEmpty()) {
for (int i = 0; i < UserManager.getInstance().getUserPictureses().size(); i++) {
Log.v("pictures", UserManager.getInstance().getUserPictureses().get(i).picture + "");
}
}
super.onPostExecute(s);
}
}
*/
/**---------------------------------------------------------------------------------------------*/
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main, menu);
//menu.removeItem(R.id.Station);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.Station:
Fragment fragment = new Stations();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/**---------------------------------------------------------------------------------------------*/
}
The xml view:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/blue">
<Button
android:id="#+id/addUser_button"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="#string/add_user"
android:background="#drawable/button_yellow_background"
android:textStyle="bold"
android:textSize="20sp"
android:textColor="#color/blue"/>
<android.support.v4.widget.SwipeRefreshLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/swipe">
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#color/blue"
/>
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>
</RelativeLayout>
Thank you!

There is a huge problem in your SampleAdapter.getView() method.
When you scroll down the View disappearing at the top of the screen is reused to be injected at the bottom. This reused View is the convertView you get as getView parameter.
As you code is, the reused view is injected with the exact same data (because if (convertView == null) { is always false when you scroll).
Images and texts are not updated.
When you scroll down, the element disappearing at the top just appears at the bottom, and so does others...
You should be doing something like:
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_usermana, null);
// The ViewHolder constructor should handle the mapping of its views
holder = new ViewHolder(convertView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Here you should only use holder as in:
holder.userpicture.setImageDrawable(getResources().getDrawable(getItem(position).userPicture));
...
}

This method looks strange, and is perhaps suspect. I don't see getUsers_mana() defined anywhere in this sample code, so I don't know if it is the problem or not. For one, you should call that 'UserManager.getInstance().getUsers_mana()' and then 'get(i)' once each and store the results in variables.
private void setContent(){
SampleAdapter adapter = new SampleAdapter(getActivity());
adapter.notifyDataSetChanged();
try {
if (!UserManager.getInstance().getUsers_mana().isEmpty()) {
for (int i = 0; i < UserManager.getInstance().getUsers_mana().size(); i++) {
Log.e("adding to adapter:",UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName + "" + UserManager.getInstance().getUsers_mana().get(i).id + "" + UserManager.getInstance().getUsers_mana().get(i).username + "group:" + UserManager.getInstance().getUsers_mana().get(i).group);
adapter.add(new SampleItem(
UserManager.getInstance().getUsers_mana().get(i).id
, UserManager.getInstance().getUsers_mana().get(i).firstName + " " + UserManager.getInstance().getUsers_mana().get(i).lastName
, UserManager.getInstance().getUsers_mana().get(i).username
, UserManager.getInstance().getUsers_mana().get(i).group
, R.drawable.users_test
, R.drawable.settings
, R.drawable.delete
, UserManager.getInstance().getUsers_mana().get(i).activated
));
}
listView.setAdapter(adapter);Log.e("setting","ListView");
}
}catch (Exception e){
Log.e("error setContent", e.getMessage().toString());
}
}

It is because you are not doing anything in the
else {
convertView.getTag();
}
Check here
Why we should re-assign values for a recycled convertView in getView()
You have to reassign values to the convertView with the data of the 5th roq, 6th row etc. otherwise it still contains the old data

Remove the initialization of holder on the top and just put this line of code in the beginning of getView function.
ViewHolder holder = null;
You need to re initialize holder if its null and you need to update it with latest data if its not null.

See this sample it might help you
https://github.com/erikwt/PullToRefresh-ListView