Develop Reference

ViewPager second fragment is blank

I know that this question has been asked before but none of the solutions worked for me. I have a ViewPager in a TabLayout with fragments for each of the tabs. Now, each of those fragments has a RecyclerView that gets data from the internet and only the first RecyclerView is populated. I can't figure out how I'm messing up. I know it's just because I'm not using it right but I can't really figure out how. I'd really appreciate some help.
It looks like this where the second tab is just empty:
Here's my code:
Code
MainActivity.java
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager2.widget.ViewPager2;
import android.os.Bundle;
import com.google.android.material.tabs.TabLayout;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.Style;
public class MainActivity extends AppCompatActivity {
private MapView mapView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Mapbox Access token
Mapbox.getInstance(getApplicationContext(), getString(R.string.mapbox_api_key));
setContentView(R.layout.activity_main);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(mapboxMap -> mapboxMap.setStyle(Style.DARK, style -> {
}));
ViewPager2 pager = findViewById(R.id.view_pager);
ViewPageAdapter pageAdapter = new ViewPageAdapter(getSupportFragmentManager(), getLifecycle());
pager.setAdapter(pageAdapter);
pager.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);
TabLayout tabLayout = findViewById(R.id.tabLayout2);
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
new StatsLoader("https://api.covid19api.com/summary", pageAdapter, pager, tabLayout).execute();
new NewsLoader("https://newsapi.org/v2/top-headlines?q=coronavirus&sortBy=popularity", pageAdapter, pager, tabLayout).execute();
}
}
SortJSONArray.java
import android.util.Log;
import org.json.JSONObject;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
class SortJsonArray {
void sortArray(List list, final String keyName, final boolean ascending) {
Collections.sort(list, new Comparator<JSONObject>() {
private final String KEY_NAME = keyName;
#Override
public int compare(JSONObject o1, JSONObject o2) {
String val1 = "";
String val2 = "";
try {
val1 = String.valueOf(o1.get(KEY_NAME));
val2 = String.valueOf(o2.get(KEY_NAME));
} catch (Exception e) {
Log.e("Sort Exception", "Issue when sorting JSONArray", e);
e.printStackTrace();
}
if (IntCheckHelper.isInteger(val1)) {
if (ascending) {
return Integer.valueOf(val1).compareTo(Integer.valueOf(val2));
}
else {
return Integer.valueOf(val2).compareTo(Integer.valueOf(val1));
}
}
else {
if (ascending) {
return val1.compareToIgnoreCase(val2);
}
else {
return val2.compareToIgnoreCase(val1);
}
}
}
});
}
}
StatsFragment.java
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import org.json.JSONArray;
public class StatsFragment extends Fragment {
View view;
RecyclerView recyclerView;
JSONArray covidData;
String dataUrl;
public StatsFragment(JSONArray data, String url) {
covidData = data;
dataUrl = url;
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.view_page, container, false);
recyclerView = view.findViewById(R.id.recyclerView2);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(false);
RecyclerView.Adapter<CustomListAdapter.ListViewHolder> mAdapter = new CustomListAdapter(covidData, dataUrl);
recyclerView.setAdapter(mAdapter);
return view;
}
}
CustomListAdapter.java
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import org.json.JSONArray;
import org.json.JSONException;
import java.text.NumberFormat;
public class CustomListAdapter extends RecyclerView.Adapter<CustomListAdapter.ListViewHolder> {
private JSONArray mDataset;
private String murl;
static class ListViewHolder extends RecyclerView.ViewHolder {
TextView textView;
TextView textView2;
ImageView imageView;
ListViewHolder(LinearLayout v) {
super(v);
textView = v.findViewById(R.id.name);
textView2 = v.findViewById(R.id.cases);
imageView = v.findViewById(R.id.image);
}
}
CustomListAdapter(JSONArray myDataset, String url) {
mDataset = myDataset;
murl = url;
}
#NonNull
#Override
public CustomListAdapter.ListViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
LinearLayout linearLayout = (LinearLayout) LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_view, parent, false);
// TextView v = (TextView) linearLayout.findViewById(R.id.info_text);
return new ListViewHolder(linearLayout);
}
#Override
public void onBindViewHolder(ListViewHolder holder, int position) {
String textViewString = "";
String textView2String = "";
try {
if (murl.contains("api.covid19api.com")) {
textViewString = mDataset.getJSONObject(position).getString("Country");
textView2String = NumberFormat.getInstance().format(mDataset.getJSONObject(position).getInt("TotalConfirmed"));
}
else if (murl.contains("newsapi.org")) {
textViewString = mDataset.getJSONObject(position).getString("title");
textView2String = mDataset.getJSONObject(position).getString("description");
}
holder.textView.setText(textViewString);
holder.textView2.setText(textView2String);
} catch (JSONException e) {
e.printStackTrace();
}
}
#Override
public int getItemCount() {
return mDataset.length();
}
}
StatsLoader.java
import android.os.AsyncTask;
import android.util.Log;
import androidx.annotation.Nullable;
import androidx.viewpager2.widget.ViewPager2;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import javax.net.ssl.HttpsURLConnection;
public class StatsLoader extends AsyncTask<String, Void, JSONArray> {
Exception exception;
String urlString = "";
static JSONArray covidData = new JSONArray();
ViewPageAdapter pageAdapter;
ViewPager2 viewPager2;
TabLayout tabLayout;
public StatsLoader(String url, ViewPageAdapter adapter, ViewPager2 pager, TabLayout tabs) {
super();
urlString = url;
pageAdapter = adapter;
viewPager2 = pager;
tabLayout = tabs;
}
#Nullable
#Override
public JSONArray doInBackground(String ... urls) {
HttpsURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(urlString);
connection = (HttpsURLConnection) url.openConnection();
connection.connect();
InputStream inputStream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder buffer = new StringBuilder();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
JSONObject json = new JSONObject(buffer.toString());
covidData = json.getJSONArray("Countries");
ArrayList<Object> list = new ArrayList<>();
for (int i = 0; i < covidData.length(); i++) {
list.add(covidData.get(i));
}
SortJsonArray sortJsonArray = new SortJsonArray();
sortJsonArray.sortArray(list, "TotalConfirmed", false);
covidData = new JSONArray();
for (Object object : list) {
covidData.put(object);
}
return covidData;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(JSONArray coviddata) {
if (this.exception == null) {
Log.d("Check", "Works!");
pageAdapter.addFragment(new StatsFragment(coviddata, urlString), "Stats");
viewPager2.setAdapter(pageAdapter);
new TabLayoutMediator(tabLayout, viewPager2,
(tab, position) -> {
switch (position) {
case 0:
tab.setText("Stats");
break;
case 1:
tab.setText("News");
break;
case 2:
tab.setText("Symptoms");
break;
case 3:
tab.setText("Safety");
break;
default:
break;
}
}).attach();
}
}
}
ViewPageAdapter.java
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.Lifecycle;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import java.util.ArrayList;
public class ViewPageAdapter extends FragmentStateAdapter {
private final ArrayList<Fragment> fragments = new ArrayList<>();
private final ArrayList<String> titles = new ArrayList<>();
public ViewPageAdapter(#NonNull FragmentManager fragmentManager, #NonNull Lifecycle lifecycle) {
super(fragmentManager, lifecycle);
}
public void addFragment(Fragment fragment, String title) {
fragments.add(fragment);
titles.add(title);
}
#NonNull
#Override
public Fragment createFragment(int position) {
return fragments.get(position);
}
#Override
public int getItemCount() {
return fragments.size();
}
}
NewsFragment.java
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import org.json.JSONArray;
public class NewsFragment extends Fragment {
View view;
RecyclerView recyclerView;
JSONArray news;
String newsUrl;
public NewsFragment(JSONArray data, String url) {
news = data;
newsUrl = url;
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.view_page, container, false);
recyclerView = view.findViewById(R.id.recyclerView2);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(false);
RecyclerView.Adapter<CustomListAdapter.ListViewHolder> mAdapter = new CustomListAdapter(news, newsUrl);
recyclerView.setAdapter(mAdapter);
return view;
}
}
NewsLoader.java
import android.os.AsyncTask;
import android.util.Log;
import androidx.annotation.Nullable;
import androidx.viewpager2.widget.ViewPager2;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public class NewsLoader extends AsyncTask<String, Void, JSONArray> {
Exception exception;
String urlString = "";
static JSONArray news = new JSONArray();
ViewPageAdapter pageAdapter;
ViewPager2 viewPager2;
TabLayout tabLayout;
public NewsLoader(String url, ViewPageAdapter adapter, ViewPager2 pager, TabLayout tabs) {
super();
urlString = url;
pageAdapter = adapter;
viewPager2 = pager;
tabLayout = tabs;
}
#Nullable
#Override
public JSONArray doInBackground(String ... urls) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(urlString);
connection = (HttpsURLConnection) url.openConnection();
connection.addRequestProperty("Authorization", "Bearer baef544b7dbe4ff8b15bb502d1fd5e1a");
connection.connect();
InputStream inputStream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder buffer = new StringBuilder();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
JSONObject json = new JSONObject(buffer.toString());
news = json.getJSONArray("articles");
return news;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(JSONArray newsData) {
if (this.exception == null) {
Log.d("Check", "Works!");
pageAdapter.addFragment(new NewsFragment(newsData, urlString), "News");
viewPager2.setAdapter(pageAdapter);
new TabLayoutMediator(tabLayout, viewPager2,
(tab, position) -> {
switch (position) {
case 0:
tab.setText("Stats");
break;
case 1:
tab.setText("News");
break;
case 2:
tab.setText("Symptoms");
break;
case 3:
tab.setText("Safety");
break;
default:
break;
}
}).attach();
}
}
}
Layouts
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:statusBarScrim="#null"
app:titleEnabled="false"
android:minHeight="?attr/actionBarSize" >
<fragment
android:id="#+id/mapView"
android:name="com.mapbox.mapboxsdk.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="350sp"
android:apiKey="#string/mapbox_api_key"
android:clickable="true"
android:enabled="true"
android:focusable="true"
app:layout_collapseMode="parallax" />
<androidx.appcompat.widget.Toolbar
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="48dp"
android:gravity="top"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:popupTheme="#style/ThemeOverlay.AppCompat.Dark"
app:title="" />
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="parent">
</com.google.android.material.tabs.TabLayout>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="parent"
tools:listitem="#layout/view_page" >
</androidx.viewpager2.widget.ViewPager2>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
list_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:id="#+id/card_view"
android:layout_gravity="center"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardCornerRadius="14sp"
android:layout_margin="15sp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="40sp">
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/name"
android:layout_toStartOf="#+id/name"
android:contentDescription="Image of country flag" />
<TextView
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="10sp" />
<TextView
android:id="#+id/cases"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/name" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
view_page.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="parent"
tools:listitem="#layout/list_view">
</androidx.recyclerview.widget.RecyclerView>
</androidx.constraintlayout.widget.ConstraintLayout>
API Key
pk.eyJ1IjoiZGF5ZW1zYWVlZCIsImEiOiJja2E2d3FyZTYwZHh5MnptdzFjcXMycTRxIn0.hpzQHB9-_OTMC1iGkkvYpw
The issue is with the NewsFragment and NewsLoader section of the code since that's the one not showing up. I added the rest for context in case anyone needs it. Thank you!
Edit: Added the SortJSONArray code and API key as per the comment suggestion.

just fix your layout...data is there only
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
tools:listitem="#layout/list_view">
</androidx.recyclerview.widget.RecyclerView>
remove:
app:layout_constraintTop_toBottomOf="parent"

How can I display a JPG image, taken from an API, in a Recyclerview in Android Studio?

The images are being downloaded in RecipeApiActivity - I can see them in a test ImageView called 'imigiview', so the API Request works! But I want them to be displayed correctly in a recyclerview - now it shows nothing at all.
For that I created a list of Bitmaps in which I put all the downloaded bitmaps, this list is given to the RecipeAPIAdapter that should place them in the RecyclerView.
Can you help me find out why the images are not shown? ( The Logcat gives me no error of any kind)
package byDragosT.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Map;
// Aceasta activitate detine o lista de retete gasita pe spoontacular bagata in recyclerview//
// Va lua un RecipeItem si il va baga in RecipeApiAdapter si apoi il conecteaza la recyclerview
public class RecipeAPIActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecipeApiAdapter adapter;
// private TextView jsonUnparsedResult;
private ImageView imigiView;
private ArrayList<Bitmap> images = new ArrayList<>(8);
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipe_api);
String url1 = "flour"; // just for simplifying the stackOverflow question I put this value here
String url2 = "egg"; // just for simplifying the stackOverflow question I put this value here
String url3 = "salt"; // just for simplifying the stackOverflow question I put this value here
String urlfinal = "https://spoonacular-recipe-food-nutrition-v1.p.rapidapi.com/recipes/findByIngredients?number=5&ranking=1&ignorePantry=false&ingredients=" + url1 + url2 + url3;
System.out.println(urlfinal);
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(urlfinal)
.get()
.addHeader("x-rapidapi-host", "spoonacular-recipe-food-nutrition-v1.p.rapidapi.com")
.addHeader("x-rapidapi-key", "key hidden")
.build();
client.newCall(request).enqueue(new Callback() {
#Override
public void onFailure(Request request, IOException e) {
e.printStackTrace();
}
#Override
public void onResponse(final Response response) throws IOException {
if (response.isSuccessful()){
//Aici inca suntem pe background thread - metoda enqueue -- //
final String myResponse;
myResponse = response.body().string();
// Aici trecem pe threadul principal din nou //
RecipeAPIActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
// jsonUnparsedResult.setText(myResponse);
System.out.println(myResponse);
try {
JSONArray results = new JSONArray(myResponse);
if(results.length() > 0){
for (int i = 0; i < results.length(); i++){
JSONObject object = results.getJSONObject(i);
// jsonUnparsedResult.setText(object.getString("title"));
System.out.println(object.getString("image"));
// SPRITES
String imgUrl = object.getString("image"); // aici sprites e Obiect cu 8 perechi key-values
new DownloadSpriteTask().execute(imgUrl);
}
}
} catch (JSONException e) { e.printStackTrace(); }
}
});
}
}
});
imigiView = findViewById(R.id.imaginedetest); // on post execute at Asynktask
recyclerView = findViewById(R.id.recyclerView);
layoutManager = new LinearLayoutManager(context);
recyclerView.setLayoutManager(layoutManager);
// System.out.println("ce se intampla" + images);
adapter = new RecipeApiAdapter(images);
recyclerView.setAdapter(adapter);
// jsonUnparsedResult = findViewById(R.id.JsonExample);
}
private class DownloadSpriteTask extends AsyncTask<String, Void, Bitmap> {
#Override
protected Bitmap doInBackground(String... strings) {
try {
URL url = new URL(strings[0]);
return BitmapFactory.decodeStream(url.openStream());
} catch (IOException e) {
Log.e("cs50", "Download sprite error", e);
return null;
}
}
#Override
protected void onPostExecute(Bitmap bitmap) {
imigiView.setImageBitmap(bitmap);
images.add(bitmap); /// images e facut sa ia int ca valoare nu Bitmap
System.out.println("Another photo attached!");
}
}
/// Ingredients should be comma separated //// symbol for ',' is %252C
//// symbol for space ' ' is %20 //
public String urlify (String ingredient, String vitamina){
String theUrl = "";
if (ingredient.equals("Choose a " + vitamina + " ingredient")){
System.out.println("VA RUGAM sa introduceti ceva ok !!!!!!!!!!");
ingredient = "";
}else{
String[] splitResult = ingredient.split(" ",8);
for (String word:splitResult){
if (word.equals("-")){
theUrl = theUrl + "%252C";
break;
}else theUrl = theUrl + word + "%20";
}
}
return theUrl;
}
}
RecipeAPIAdapter
package byDragosT.myapplication;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
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 androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class RecipeApiAdapter extends RecyclerView.Adapter<RecipeApiAdapter.RecipeViewHolder> {
private ArrayList<Bitmap> images;
public RecipeApiAdapter(ArrayList<Bitmap> images){
this.images = images;
}
public static class RecipeViewHolder extends RecyclerView.ViewHolder {
public ImageView pozaReteta;
public TextView titlu;
public TextView descriere;
RecipeViewHolder(View view){
super(view);
pozaReteta = view.findViewById(R.id.poza);
titlu = view.findViewById(R.id.recipe_name);
descriere = view.findViewById(R.id.ingredients_list);
}
}
#NonNull
#Override //// Mare grija ce layout pui aici - sfat pentru viitor - mi-a luat 4 ore sa gasesc eroarea
public RecipeViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recipe_item_in_recyclerview_api, parent, false);
RecipeViewHolder recipeViewHolder = new RecipeViewHolder(view);
return recipeViewHolder;
}
#Override
public void onBindViewHolder(#NonNull RecipeViewHolder holder, int position) {
Bitmap image_id = images.get(position);
holder.pozaReteta.setImageBitmap(image_id);
holder.titlu.setText("Image: "+ position);
}
#Override
public int getItemCount() {
return images.size();
}
}
activity_recipe_api.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".RecipeAPIActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
<TextView
android:id="#+id/JsonExample"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="150dp"
android:layout_marginBottom="8dp"
android:text="Testing testing 123"
android:background="#color/colorPrimaryDark"
android:textColor="#android:color/background_light"
app:layout_constraintStart_toEndOf="#+id/recyclerView" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imaginedetest"
android:contentDescription="#string/imagine_de_test" />
</RelativeLayout>
recipe_item_in_recyclerview_api.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dp">
<ImageView
android:id="#+id/poza"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="4dp"
android:layout_marginEnd="2dp"
android:paddingTop="10dp"
app:layout_constraintEnd_toStartOf="#+id/ingredients_list"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="#android:drawable/sym_def_app_icon" />
<TextView
android:id="#+id/recipe_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="#string/mankarika_super"
android:textAlignment="center"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.52"
app:layout_constraintStart_toEndOf="#+id/poza"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/ingredients_list"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:text="Se face din: ceapa, apa, si multe multe multe multe multe multe multe multe multe multe multe multe chestii"
android:textAlignment="gravity"
android:textSize="12sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/poza"
app:layout_constraintTop_toBottomOf="#+id/recipe_name" />
</androidx.constraintlayout.widget.ConstraintLayout>

For image loading by far the easiest is using either Picasso or Glide.
Honestly, I have no idea how to do it without using those libs :)

Why My Recyclerview Isn't Working In An Acticvity

I need to parse json and show them on RecyclerView.. But my RecyclerView isn't working..
I need to fix this..
This is Json
Simple Json File for My app
[
{
"name": "Saif Maroof",
"roll": 978617,
"gender":"Male",
"phonenumber": 01931078639,
"StudentImage": "R.drawble.books"
},
{
"name": "Minhaj",
"roll": 978617,
"gender":"Male",
"phonenumber": 01931078639,
"studentimage": "R.drawble.books"
}
]
This is StudentInfo Activity
I think in this activity nothing gets wrong
package com.college.npc17_18.activity;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import com.college.npc17_18.MainActivity;
import com.college.npc17_18.R;
import com.college.npc17_18.adapter.StudentInfoAdapter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class StudentInfo extends AppCompatActivity {
RecyclerView recyclerView;
StudentInfoAdapter studentInfoAdapter;
RecyclerView.Adapter adapter;
// ProgressBar progressBar;
RecyclerView.LayoutManager layoutManager;
List <Object> studentInfo = new ArrayList<>();
DividerItemDecoration dividerItemDecoration;
private static final String TAG = "MainActivity";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_info);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// progressBar = findViewById(R.id.progress_circular_country);
recyclerView = findViewById(R.id.studentsInfoRecycleView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new StudentInfoAdapter(this,studentInfo);
// String jsonFileString = Utils.getJsonFromAssets(getApplicationContext(), "studentinfo.json");
// progressBar.setVisibility(View.GONE);
// studentInfoAdapter = new StudentInfoAdapter(this,studentInfo);
recyclerView.setAdapter(adapter);
addItemsFromJSON();
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
finish();
}
return super.onOptionsItemSelected(item);
}
private void addItemsFromJSON() {
try {
String jsonDataString = readJSONDataFromFile();
JSONArray jsonArray = new JSONArray(jsonDataString);
for (int i=0; i<jsonArray.length(); ++i) {
JSONObject itemObj = jsonArray.getJSONObject(i);
String name = itemObj.getString("name");
String roll = itemObj.getString ("roll");
String phonenumber = itemObj.getString("phonenumber");
String gender = itemObj.getString("gender");
int studentimage = itemObj.getInt("studentimage");
com.college.npc17_18.model.StudentInfo studentInfos = new com.college.npc17_18.model.StudentInfo(name,roll,phonenumber,gender,studentimage);
studentInfo.add(studentInfos);
}
} catch (JSONException | IOException e) {
Log.d(TAG, "addItemsFromJSON: ", e);
}
}
private String readJSONDataFromFile() throws IOException{
InputStream inputStream = null;
StringBuilder builder = new StringBuilder();
try {
String jsonString = null;
inputStream = getResources().openRawResource(R.raw.studentinfo);
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(inputStream, "UTF-8"));
while ((jsonString = bufferedReader.readLine()) != null) {
builder.append(jsonString);
}
} finally {
if (inputStream != null) {
inputStream.close();
}
}
return new String(builder);
}
}
This is StudentInfo Adapter
package com.college.npc17_18.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.college.npc17_18.R;
import com.college.npc17_18.model.StudentInfo;
import java.util.ArrayList;
import java.util.List;
public class StudentInfoAdapter extends RecyclerView.Adapter <StudentInfoAdapter.Viewholder> {
private List <Object> studentInfos;
Context context;
public StudentInfoAdapter(Context context, List<Object> studentInfo) {
this.studentInfos = studentInfo;
this.context = context;
}
#NonNull
#Override
public StudentInfoAdapter.Viewholder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.studentitem,parent,false);
return new Viewholder(view);
}
#Override
public void onBindViewHolder(#NonNull StudentInfoAdapter.Viewholder holder, int position) {
StudentInfo studentInfo = (StudentInfo) studentInfos.get(position);
holder.StudentImageId.setImageResource (studentInfo.getStudentImage());
holder.NameId.setText("Name:"+studentInfo.getNamme());
holder.RollId.setText("Roll"+studentInfo.getRoll());
holder.GenderId.setText("Gender:"+studentInfo.getGender());
holder.PhoneNumberId.setText("Phone Number:"+studentInfo.getPhoneNumber());
}
#Override
public int getItemCount() {
return studentInfos.size();
}
public class Viewholder extends RecyclerView.ViewHolder{
TextView NameId,RollId,PhoneNumberId,GenderId;
ImageView StudentImageId;
public Viewholder(#NonNull View itemView) {
super(itemView);
StudentImageId = itemView.findViewById(R.id.StudentImageId);
NameId = itemView.findViewById(R.id.NameId);
RollId = itemView.findViewById(R.id.RollId);
// CGPAId = itemView.findViewById(R.id.CGPAId);
GenderId = itemView.findViewById(R.id.GenderId);
PhoneNumberId = itemView.findViewById(R.id.PhoneNumberId);
}
}
}
This is StudentItem.xml
Layout for RecyclerView...
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:clickable="true"
android:elevation="40dp"
app:cardCornerRadius="5dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/StudentImageId"
android:layout_width="71dp"
android:layout_height="match_parent" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:orientation="vertical">
<TextView
android:id="#+id/NameId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Name"
android:textSize="18sp" />
<TextView
android:id="#+id/RollId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Roll" />
<TextView
android:id="#+id/GenderId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Gender" />
<TextView
android:id="#+id/PhoneNumberId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Phone Number" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
Now what do I need to do?

At the time when you instantiate an object of your adapter class
adapter = new StudentInfoAdapter(this,studentInfo);
Your adapter object is initialized with an empty studentInfo list
So, you should call adapter.notifyDataSetChanged(); in your addItemsFromJSON() method when the JSON parsing is completed.

update your adapter after you set your data
yourAdapter.notifyDataSerChanged();

When clicked on select item in ListView nothing happen but no error in LogCat

I have problem select item on my ListView . When I clicked nothing happen and I could not go to the next activity because the current listView not clickable.
I tried debugging code line by line but it seems like it not enter the public void onItemClick part. Why it became like that?
Here is my code,
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.Button;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class ViewAllBills extends AppCompatActivity implements ListView.OnItemClickListener {
private ListView listView;
private Button mydebtsBtn;
private String JSON_STRING;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_all_bills);
listView = (ListView) findViewById(R.id.listView);
listView.setOnItemClickListener(this);
getJSON();
myDebt();
}
//for new bill
public void myDebt() {
mydebtsBtn = (Button) findViewById(R.id.buttonMyDebt);
mydebtsBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Intent page1 = new Intent(ViewAllBills.this,myDebt.class);
startActivity(page1);
}
});}
private void showBills(){
JSONObject jsonObject = null;
ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String, String>>();
try {
jsonObject = new JSONObject(JSON_STRING);
JSONArray result = jsonObject.getJSONArray(Config.TAG_JSON_ARRAY);
for(int i = 0; i<result.length(); i++){
JSONObject jo = result.getJSONObject(i);
String id = jo.getString(Config.TAG_ID);
String desc = jo.getString(Config.TAG_DESCRIPTION);
String amo = jo.getString(Config.TAG_AMOUNT);
HashMap<String,String> bills = new HashMap<>();
bills.put(Config.TAG_ID,id);
bills.put(Config.TAG_DESCRIPTION,desc);
bills.put(Config.TAG_AMOUNT,amo);
list.add(bills);
}
} catch (JSONException e) {
e.printStackTrace();
}
ListAdapter adapter = new SimpleAdapter(
ViewAllBills.this, list, R.layout.list_item,
new String[]{Config.TAG_ID,Config.TAG_DESCRIPTION,Config.TAG_AMOUNT},
new int[]{R.id.id, R.id.description,R.id.amountBill});
listView.setAdapter(adapter);
}
private void getJSON(){
class GetJSON extends AsyncTask<Void,Void,String>{
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ViewAllBills.this,"Fetching Data","Wait...",false,false);
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
JSON_STRING = s;
showBills();
}
#Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
String s = rh.sendGetRequest(Config.URL_GET_ALL);
return s;
}
}
GetJSON gj = new GetJSON();
gj.execute();
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(ViewAllBills.this, ViewBills.class);
HashMap<String,String> map =(HashMap)parent.getItemAtPosition(position);
String billId = map.get(Config.TAG_ID).toString();
intent.putExtra(Config.BILL_ID,billId);
startActivity(intent);
}
}
This is my xml file
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:background="#color/skyBlue">
<Button android:id="#+id/buttonMyDebt"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginTop="10dip"
android:background="#color/colorAccent"
android:textColor="#color/black"
android:textStyle="bold"
android:focusable="false"
android:text="My Debt"
android:onClick="myDebt"/>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:columnCount="3"
android:rowCount="3"
android:background="#color/softGrey"
android:layout_marginTop="5dp">
<TextView
android:id="#+id/ids"
android:layout_width="40dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:textStyle="bold"
android:layout_gravity="center"
android:text="ID"
/>
<TextView
android:id="#+id/descriptions"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_marginTop="10dp"
android:text="Bill Description"
android:layout_gravity="center"
/>
<TextView
android:id="#+id/amounts"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_marginTop="10dp"
android:text="Amount (RM)"
android:layout_gravity="right"
/>
</GridLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:id="#+id/listView" />
</LinearLayout>
</ScrollView>
This is my List_item.xml layout
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:background="#color/skyBlue"
>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnCount="3"
android:rowCount="3"
android:background="#drawable/border_style"
android:layout_marginTop="5dp">
<TextView
android:id="#+id/id"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:textStyle="bold" />
<TextView
android:id="#+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
/>
<TextView
android:id="#+id/amountBill"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_gravity="right"
/>
</GridLayout>
</ScrollView>

Try this:
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.Button;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class ViewAllBills extends AppCompatActivity implements ListView.OnItemClickListener {
private Button mydebtsBtn;
private String JSON_STRING;
private ListView listView;
ArrayList<HashMap<String,String>> list;
ListAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_all_bills);
listView = (ListView) findViewById(R.id.listView);
list = new ArrayList<HashMap<String, String>>();
getJSON();
myDebt();
}
//for new bill
public void myDebt() {
mydebtsBtn = (Button) findViewById(R.id.buttonMyDebt);
mydebtsBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Intent page1 = new Intent(ViewAllBills.this,myDebt.class);
startActivity(page1);
}
});}
private void showBills(){
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(JSON_STRING);
JSONArray result = jsonObject.getJSONArray(Config.TAG_JSON_ARRAY);
for(int i = 0; i<result.length(); i++){
JSONObject jo = result.getJSONObject(i);
String id = jo.getString(Config.TAG_ID);
String desc = jo.getString(Config.TAG_DESCRIPTION);
String amo = jo.getString(Config.TAG_AMOUNT);
HashMap<String,String> bills = new HashMap<>();
bills.put(Config.TAG_ID,id);
bills.put(Config.TAG_DESCRIPTION,desc);
bills.put(Config.TAG_AMOUNT,amo);
list.add(bills);
}
} catch (JSONException e) {
e.printStackTrace();
}
adapter = new SimpleAdapter(
ViewAllBills.this, list, R.layout.list_item,
new String[]{Config.TAG_ID,Config.TAG_DESCRIPTION,Config.TAG_AMOUNT},
new int[]{R.id.id, R.id.description,R.id.amountBill});
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
private void getJSON(){
class GetJSON extends AsyncTask<Void,Void,String>{
ProgressDialog loading;
#Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ViewAllBills.this,"Fetching Data","Wait...",false,false);
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
JSON_STRING = s;
showBills();
}
#Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
String s = rh.sendGetRequest(Config.URL_GET_ALL);
return s;
}
}
GetJSON gj = new GetJSON();
gj.execute();
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(ViewAllBills.this, ViewBills.class);
HashMap<String,String> map = list.get(position);
String billId = map.get(Config.TAG_ID).toString();
intent.putExtra(Config.BILL_ID,billId);
startActivity(intent);
}
}

If you have an active view/focusable view in your list view then it will disable your onItemClickListener.you can try to make it unfocusable by adding: android:focusable="false" ,android:focusableInTouchMode="false"to any view that is usually focusable.
I was facing the same problem and setting android:focusableInTouchMode="false" solve my problem

My problem solved..
Actually i duplicating the scrolview layout in my list_item.xml.. after i removed the scrolview and left the gridlayout only, the select list item working..

Retrieve Data From MySQL Database in Android

I just follow this tutorial: HERE to retrieve products from DB, but when I run my app I get blank page, I try to fix the problem but with any result.
NOTE: I have create add product form and it work, the product inserted to DB but in the interface that I have apply the tutorial to display my products stay always blank.
this is my code:
AjouterProduit.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class AjouterProduit extends AppCompatActivity implements Download_data.download_complete {
public ListView list;
public ArrayList<Countries> countries = new ArrayList<Countries>();
public ListAdapter adapter;
EditText gamme,produit,desc;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ajouterproduit);
list = (ListView) findViewById(R.id.list);
adapter = new ListAdapter(this);
list.setAdapter(adapter);
Download_data download_data = new Download_data((Download_data.download_complete) this);
download_data.download_data_from_link("http://192.168.148.1/Ajout.php");
// download_data.download_data_from_link("http://www.kaleidosblog.com/tutorial/tutorial.json");
gamme =(EditText)findViewById(R.id.editText);
produit=(EditText)findViewById(R.id.editText2);
desc=(EditText)findViewById(R.id.editText3);
}
public void Ajout(View view){
String ga,pro,des;
ga=gamme.getText().toString();
pro=produit.getText().toString();
des=desc.getText().toString();
String type = "ajout";
work3 backgroundWorker = new work3(this);
backgroundWorker.execute(type,ga, pro ,des);
}
#Override
public void get_data(String data) {
}
public class Countries {
private String DescriptionProduit;
//public String NomProduit;
private String NomProduit;
{
String data = null;
JSONArray data_array= null;
try {
data_array = new JSONArray(data);
} catch (JSONException e1) {
e1.printStackTrace();
}
for (int i = 0 ; i < data_array.length() ; i++)
{
JSONObject obj= null;
try {
obj = new JSONObject(data_array.get(i).toString());
} catch (JSONException e1) {
e1.printStackTrace();
}
Countries add=new Countries(getNomProduit(), getDescriptionProduit());
try {
add.setNomProduit(obj.getString("NomProduit"));
} catch (JSONException e1) {
e1.printStackTrace();
}
try {
add.setDescriptionProduit(obj.getString("DescriptionProduit"));
} catch (JSONException e1) {
e1.printStackTrace();
}
countries.add(add);
}
adapter.notifyDataSetChanged();
}
private Countries(String nomProduit, String descriptionProduit) {
setNomProduit(nomProduit);
setDescriptionProduit(descriptionProduit);
}
public String getNomProduit() {
return NomProduit;
}
public void setNomProduit(String nomProduit) {
NomProduit = nomProduit;
}
public String getDescriptionProduit() {
return DescriptionProduit;
}
public void setDescriptionProduit(String descriptionProduit) {
DescriptionProduit = descriptionProduit;
}
}
}
Download_data.java
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class Download_data implements Runnable {
public download_complete caller;
public interface download_complete
{
public void get_data(String data);
}
Download_data(download_complete caller) {
this.caller = caller;
}
public String link;
public void download_data_from_link(String link)
{
this.link = link;
Thread t = new Thread(this);
t.start();
}
public void run() {
threadMsg(download(this.link));
}
private void threadMsg(String msg) {
if (!msg.equals(null) && !msg.equals("")) {
Message msgObj = handler.obtainMessage();
Bundle b = new Bundle();
b.putString("message", msg);
msgObj.setData(b);
handler.sendMessage(msgObj);
}
}
private final Handler handler = new Handler() {
public void handleMessage(Message msg) {
String Response = msg.getData().getString("message");
caller.get_data(Response);
}
};
public static String download(String url) {
URL website;
StringBuilder response = null;
try {
website = new URL(url);
HttpURLConnection connection = (HttpURLConnection) website.openConnection();
connection.setRequestProperty("charset", "utf-8");
BufferedReader in = new BufferedReader(
new InputStreamReader(
connection.getInputStream()));
response = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
response.append(inputLine);
in.close();
} catch (Exception e) {
return "";
}
return response.toString();
}
}
ListAdapter.java
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import static android.content.Context.LAYOUT_INFLATER_SERVICE;
public class ListAdapter extends BaseAdapter {
AjouterProduit main;
ListAdapter(AjouterProduit main)
{
this.main = main;
}
#Override
public int getCount() {
return main.countries.size();
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
static class ViewHolderItem {
TextView NomProduit;
TextView DescriptionProduit;
}
#Override
public View getView(int position, View convertView, ViewGroup parent){
ViewHolderItem holder = new ViewHolderItem();
if (convertView == null) {
LayoutInflater inflater;
inflater = (LayoutInflater) main.getSystemService(LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.cell, null);
holder.NomProduit = (TextView) convertView.findViewById(R.id.NomProduit);
holder.DescriptionProduit = (TextView) convertView.findViewById(R.id.DescriptionProduit);
convertView.setTag(holder);
}
else
{
holder = (ViewHolderItem) convertView.getTag();
}
holder.NomProduit.setText(this.main.countries.get(position).getNomProduit());
holder.DescriptionProduit.setText(this.main.countries.get(position).getDescriptionProduit());
return convertView;
}
}
cell.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<!--nom-->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/NomProduit" />
<!--description-->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/DescriptionProduit" />
</RelativeLayout>
list.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/list"
/>
</RelativeLayout>
ajouterproduit.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Nom gamme"
android:id="#+id/textView9"
android:textStyle="bold" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editText" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Nom produit"
android:id="#+id/textView10" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editText2" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Description produit"
android:id="#+id/textViewD" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editText3" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ajouter produit"
android:id="#+id/Ajout"
android:layout_gravity="center_horizontal"
android:onClick="Ajout"/>
</LinearLayout>
Ajout.php
<?php
$NomGamme=$_POST["NomGamme"];
$NomProduit=$_POST["NomProduit"];
$DescriptionProduit=$_POST["DescriptionProduit"];
//echo "Produit bien ajouter";
if($id=mysql_connect("localhost","root","") ) {
if(mysql_select_db("applicationcolorado"))
$query= "INSERT INTO `applicationcolorado`.`produitgamme` (`NomGamme`, `NomProduit`, `DescriptionProduit`)
VALUES ('$NomGamme', '$NomProduit', '$DescriptionProduit')";
if (mysql_query($query))
{echo "Produit bien ajouter";}
else {
echo "false";
}
mysql_close($id);}
?>

There is no ListView with the id list in your ajouterproduit.xml layout.
In your AjouterProduit activity, you have these lines:
setContentView(R.layout.ajouterproduit);
list = (ListView) findViewById(R.id.list);
The first line set's this activity's layout to ajouterproduit.xml and the second one tries to find a ListView with the id list in this layout which doesn't exist so list is set to null.