Develop Reference

Lisview inside a Listview not working

I am making an android app that shows weather using OWM 5day 3hour forecast API, The ui consists of EditText to input a city name, a button to initiate the call process, a listview that will display 5 entries (five days) and each day entry includes another listview that displays decription and temperature for every 3 hours in a day,
I am able to see the listview for days but cannot see the nested listview for the hourly data. My classes include : MainActivity, WeatherAdapter to show 3hourly weather, DayAdapter to show day entries, and JsonToWeather data class that extracts data out of the Json response and make an Arraylist of data for only one particular day. I tried to log the error and highlighted the error position by a comment.
MainActivity :
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private String responseJSON = null;
ListView listView;
ArrayList<WeatherData> weatherDataArrayList;
WeatherAdapter weatherAdapter = null;
EditText cityName;
String city = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.dayList);
cityName = (EditText) findViewById(R.id.cityName);
Button load = (Button) findViewById(R.id.loadButton);
load.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
city = cityName.getText().toString();
Log.d(TAG, "onClick: city is : " + city);
if(city == null){
Toast toast = null;
toast.makeText(MainActivity.this,"Please Enter a city before continuing",Toast.LENGTH_LONG);
toast.show();
} else {
String url = "http://api.openweathermap.org/data/2.5/forecast?q=" + (city.toLowerCase()) + "&units=metric&appid=8b10912e19fde267f36f6cb785ee7efd";
Log.d(TAG, "onCreate: staring download task");
DownloadJSON downloadJSON = new DownloadJSON();
downloadJSON.execute(url);
Log.d(TAG, "onCreate: after downloadtask");
}
}
});
if(weatherDataArrayList == null){
Log.d(TAG, "onCreate: ArrayList is Still null");
}
}
private class DownloadJSON extends AsyncTask<String, Void, String>{
private static final String TAG = "DownloadJSON";
private String downloadJSON(String url){
StringBuilder jsonResult = new StringBuilder();
try{
URL apiURL = new URL(url);
HttpURLConnection connection = (HttpURLConnection) apiURL.openConnection();
int responseCode = connection.getResponseCode();
Log.d(TAG, "downloadJSON: Response code "+ responseCode);
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
int charReader;
char[] inputBuffer = new char[500];
while(true){
charReader = reader.read(inputBuffer);
if(charReader < 0){
break;
}
if(charReader > 0){
jsonResult.append(String.copyValueOf(inputBuffer, 0, charReader));
}
}
reader.close();
return jsonResult.toString();
}catch (MalformedURLException e){
Log.e(TAG, "downloadJSON: URL is Invalid");
}catch (IOException e){
Log.e(TAG, "downloadJSON: IO Error");
}
return null;
}
#Override
protected String doInBackground(String... strings) {
Log.d(TAG, "doInBackground: url is : " + strings[0]);
String jsonResponse = downloadJSON(strings[0]);
if(jsonResponse == null){
Log.e(TAG, "doInBackground: Error downloading");
}
return jsonResponse;
}
#Override
protected void onPostExecute(String jsonResponse) {
super.onPostExecute(jsonResponse);
Log.d(TAG, "onPostExecute: json received is : " + jsonResponse);
if(jsonResponse != null){
JsonToWeatherData jtwd = new JsonToWeatherData();
weatherDataArrayList = jtwd.extractor(jsonResponse);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
String date1 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date2 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date3 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date4 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date5 = simpleDateFormat.format(calendar.getTime());
ArrayList<String> days = new ArrayList<>();
days.add(date1);
days.add(date2);
days.add(date3);
days.add(date4);
days.add(date5);
DayAdapter day = new DayAdapter(MainActivity.this,R.layout.layout_day_card,days,weatherDataArrayList);
listView.setAdapter(day);
} else {
Log.d(TAG, "onPostExecute: no json recieved, city is Wrong");
Toast toast = Toast.makeText(MainActivity.this,"Please provide a valid city!",Toast.LENGTH_LONG);
toast.show();
}
}
}
}
WeatherAdapter :
public class WeatherAdapter extends ArrayAdapter<WeatherData> {
private static final String TAG = "WeatherAdapter";
private final int layoutResourceID;
private LayoutInflater layoutInflater;
private ArrayList<WeatherData> block;
public WeatherAdapter(#NonNull Context context, int resource, ArrayList<WeatherData> block) {
super(context, resource, block);
this.layoutResourceID = resource;
this.block = block;
this.layoutInflater = LayoutInflater.from(context);
Log.d(TAG, "WeatherAdapter: called constructor");
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
if(convertView == null){
convertView = layoutInflater.inflate(layoutResourceID,parent,false);
}
Log.d(TAG, "getView: entered");
WeatherData weatherData = block.get(position);
TextView temp = (TextView) convertView.findViewById(R.id.temperature);
temp.setText(weatherData.getTemp());
TextView shortDesc = (TextView) convertView.findViewById(R.id.descrip);
shortDesc.setText(weatherData.getShortDesc());
return convertView;
}
}
DayAdapter :
public class DayAdapter extends ArrayAdapter<String> {
private static final String TAG = "DayAdapter";
private ArrayList<String> dayBlock;
private LayoutInflater layoutInflater;
private int layoutresourceID;
private ArrayList<WeatherData> dayWeather, fullBlock;
private Context context;
JsonToWeatherData json = new JsonToWeatherData();
public DayAdapter(#NonNull Context context, int resource, #NonNull ArrayList<String> dayBlock, ArrayList<WeatherData> weatherBlock) {
super(context, resource, dayBlock);
this.context = context;
this.dayBlock = dayBlock;
this.fullBlock = weatherBlock;
layoutInflater = LayoutInflater.from(context);
this.layoutresourceID = resource;
if(fullBlock == null){
Log.e(TAG, "DayAdapter: full block is null");
}
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
if (convertView == null){
convertView = layoutInflater.inflate(layoutresourceID,parent,false);
}
TextView date = (TextView) convertView.findViewById(R.id.date);
TextView minTempFoDay = (TextView) convertView.findViewById(R.id.minTempOfDay);
TextView maxTempFoDay = (TextView) convertView.findViewById(R.id.maxTempOfDay);
ListView weatherHolderListView = (ListView) convertView.findViewById(R.id.wHoldLV);
String dateString = dayBlock.get(position);
dayWeather = json.extractByDate(fullBlock,dateString);
if(fullBlock == null){
Log.d(TAG, "getView: fullblock is null");
}
if(dayWeather == null){
Log.d(TAG, "getView: dayweather array is null");
} else {
Log.d(TAG, "getView: dayweather is not null");
}
String test = dayWeather.get(position).getTemp(); // error occured here
Log.d(TAG, "getView: test string : " + test);
date.setText(dateString);
DecimalFormat df = new DecimalFormat(".##");
float mint = 500, maxt = 0;
String mint1 = "", maxt1 = "";
for(WeatherData data : dayWeather){
if(mint > Float.parseFloat(data.getMinTemp())){
mint = Float.parseFloat(data.getMinTemp());
mint1 = df.format(mint);
Log.d(TAG, "getView: mint : " + mint);
}
if (maxt > Float.parseFloat(data.getMaxTemp())){
maxt = Float.parseFloat(data.getMaxTemp());
maxt1 = df.format(maxt);
}
}
minTempFoDay.setText(mint1);
maxTempFoDay.setText(maxt1);
WeatherAdapter weatherAdapter = new WeatherAdapter(context,R.layout.weather_holder,dayWeather);
weatherHolderListView.setAdapter(weatherAdapter);
return convertView;
}
}
JsonToWeatherData:
public class JsonToWeatherData {
private static final String TAG = "JsonToWeatherData";
public ArrayList<WeatherData> extractor(String jsonData){
Log.d(TAG, "extractor: in the method");
if(jsonData == null){
return null; // if there is no json data is received
} else {
ArrayList<WeatherData> weatherDataArrayList = new ArrayList<WeatherData>();
Log.d(TAG, "extractor: in the else field");
try{
Log.d(TAG, "extractor: in try block");
JSONObject root = new JSONObject(jsonData);
int count = root.getInt("cnt");
JSONArray wList = root.getJSONArray("list");
for (int i = 0; i < count; ++i){
WeatherData weather = new WeatherData();
JSONObject wBlock = wList.getJSONObject(i);
weather.setDate(wBlock.getString("dt_txt"));
JSONObject mainObj = wBlock.getJSONObject("main");
weather.setTemp(String.valueOf(mainObj.getDouble("temp")));
weather.setMinTemp(String.valueOf(mainObj.getDouble("temp_min")));
weather.setMaxTemp(String.valueOf(mainObj.getDouble("temp_max")));
weather.setHumidity(String.valueOf(mainObj.getInt("humidity")));
JSONArray warray = wBlock.getJSONArray("weather");
JSONObject weatherObj = warray.getJSONObject(0);
weather.setDescription(weatherObj.getString("description"));
weather.setShortDesc(weatherObj.getString("main"));
weather.setIconID(weatherObj.getString("icon"));
weatherDataArrayList.add(weather);
Log.d(TAG, "extractor: temp field is :" + weather.getTemp());
}
}catch (JSONException e){
e.printStackTrace();
}
return weatherDataArrayList;
}
}
public ArrayList<WeatherData> extractByDate(ArrayList<WeatherData> fullList,String date){
ArrayList<WeatherData> dayweatherList = new ArrayList<WeatherData>();
for( WeatherData weather : fullList ){
if( ( weather.getDate().substring(0,9) ).equals(date) ){
dayweatherList.add(weather);
}
}
return dayweatherList;
}
}
What should I do?
Error message : (
08-19 23:11:39.914 12148-12148/com.jugalmistry.apps.fivedaysofweather D/DayAdapter: getView: dayweather is not null
08-19 23:11:39.916 12148-12148/com.jugalmistry.apps.fivedaysofweather D/AndroidRuntime: Shutting down VM
08-19 23:11:39.918 12148-12148/com.jugalmistry.apps.fivedaysofweather E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.jugalmistry.apps.fivedaysofweather, PID: 12148
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.get(ArrayList.java:411)
at com.jugalmistry.apps.fivedaysofweather.DayAdapter.getView(DayAdapter.java:58)

I have attempted to help you with the full code below.
I would also recommend you implement the ViewHolder pattern ViewHolder pattern example for increased performance.
public class MainActivity extends AppCompatActivity
{
private static final String TAG = "MainActivity";
EditText cityName;
String city = null;
ListView dayListView;
ArrayList<WeatherData> weatherDataArrayList;
DayAdapter dayAdapter;
//private String responseJSON = null;
//WeatherAdapter weatherAdapter = null; // Creating this adapter within the DayAdapter
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cityName = (EditText) findViewById(R.id.cityName);
Button load = (Button) findViewById(R.id.loadButton);
dayListView = (ListView) findViewById(R.id.dayList);
load.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
city = cityName.getText().toString();
Log.d(TAG, "onClick: city is : " + city);
if (city == null)
{
Toast toast = null;
toast.makeText(MainActivity.this,"Please Enter a city before continuing",Toast.LENGTH_LONG);
toast.show();
}
else
{
String url = "http://api.openweathermap.org/data/2.5/forecast?q=" + (city.toLowerCase()) + "&units=metric&appid=8b10912e19fde267f36f6cb785ee7efd";
Log.d(TAG, "onCreate: staring download task");
DownloadJSON downloadJSON = new DownloadJSON();
downloadJSON.execute(url);
Log.d(TAG, "onCreate: after downloadtask");
}
}
});
}
public void SetDayListData(ArrayList<String> dayBlock, ArrayList<WeatherData> weatherBlock)
{
if (dayAdapter == null)
{
dayAdapter = new DayAdapter(MainActivity.this,R.layout.layout_day_card, days, weatherDataArrayList);
dayListView.setAdapter(dayAdapter);
}
else
{
//created a new method "UpdateData" just to update the data in the adapter
dayAdapter.UpdateData(days, weatherDataArrayList);
dayAdapter.notifyDataSetChanged();
}
}
private class DownloadJSON extends AsyncTask<String, Void, String>
{
private static final String TAG = "DownloadJSON";
private String downloadJSON(String url)
{
StringBuilder jsonResult = new StringBuilder();
try
{
URL apiURL = new URL(url);
HttpURLConnection connection = (HttpURLConnection) apiURL.openConnection();
int responseCode = connection.getResponseCode();
Log.d(TAG, "downloadJSON: Response code "+ responseCode);
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
int charReader;
char[] inputBuffer = new char[500];
while (true)
{
charReader = reader.read(inputBuffer);
if (charReader < 0)
{
break;
}
if (charReader > 0)
{
jsonResult.append(String.copyValueOf(inputBuffer, 0, charReader));
}
}
reader.close();
return jsonResult.toString();
}
catch (MalformedURLException e)
{
Log.e(TAG, "downloadJSON: URL is Invalid");
}
catch (IOException e)
{
Log.e(TAG, "downloadJSON: IO Error");
}
return null;
}
#Override
protected String doInBackground(String... strings)
{
Log.d(TAG, "doInBackground: url is : " + strings[0]);
String jsonResponse = downloadJSON(strings[0]);
if (jsonResponse == null)
{
Log.e(TAG, "doInBackground: Error downloading");
}
return jsonResponse;
}
#Override
protected void onPostExecute(String jsonResponse)
{
super.onPostExecute(jsonResponse);
Log.d(TAG, "onPostExecute: json received is : " + jsonResponse);
if (jsonResponse != null)
{
JsonToWeatherData jtwd = new JsonToWeatherData();
weatherDataArrayList = jtwd.extractor(jsonResponse);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
String date1 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date2 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date3 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date4 = simpleDateFormat.format(calendar.getTime());
calendar.add(Calendar.DATE,1);
String date5 = simpleDateFormat.format(calendar.getTime());
ArrayList<String> days = new ArrayList<>();
days.add(date1);
days.add(date2);
days.add(date3);
days.add(date4);
days.add(date5);
SetDayListData(days, weatherDataArrayList);
}
else
{
Log.d(TAG, "onPostExecute: no json recieved, city is Wrong");
Toast toast = Toast.makeText(MainActivity.this,"Please provide a valid city!",Toast.LENGTH_LONG);
toast.show();
}
}
}
}
public class DayAdapter extends ArrayAdapter<String>
{
private static final String TAG = "DayAdapter";
private Context context;
private LayoutInflater layoutInflater;
private int layoutresourceID;
private ArrayList<String> dayBlock;
private ArrayList<WeatherData> dayWeather, weatherBlock;
JsonToWeatherData json = new JsonToWeatherData();
public DayAdapter(#NonNull Context context, int resource, #NonNull ArrayList<String> dayBlock, ArrayList<WeatherData> weatherBlock)
{
super(context, resource, dayBlock);
this.context = context;
this.dayBlock = dayBlock;
this.weatherBlock = weatherBlock;
layoutInflater = LayoutInflater.from(context);
this.layoutresourceID = resource;
if (weatherBlock == null)
{
Log.e(TAG, "DayAdapter: full block is null");
}
}
#Override
public int getCount()
{
return dayBlock.getSize();
}
public void UpdateData(#NonNull ArrayList<String> dayBlock, ArrayList<WeatherData> weatherBlock)
{
this.dayBlock = dayBlock;
this.weatherBlock = weatherBlock;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent)
{
if (convertView == null)
{
convertView = layoutInflater.inflate(layoutresourceID,parent,false);
}
if (weatherBlock == null)
{
Log.d(TAG, "getView: weatherBlock is null");
return convertView;
}
TextView date = (TextView) convertView.findViewById(R.id.date);
TextView minTempFoDay = (TextView) convertView.findViewById(R.id.minTempOfDay);
TextView maxTempFoDay = (TextView) convertView.findViewById(R.id.maxTempOfDay);
ListView weatherHolderListView = (ListView) convertView.findViewById(R.id.wHoldLV);
String dateString = dayBlock.get(position);
dayWeather = json.extractByDate(weatherBlock, dateString);
if (dayWeather == null)
{
Log.d(TAG, "getView: dayweather array is null");
return convertView;
}
if (position > dayWeather.getSize() - 1)
{
Log.d(TAG, "getView: the position is too great for the dayWeather array");
return convertView;
}
String test = dayWeather.get(position).getTemp(); // error occured here
Log.d(TAG, "getView: test string : " + test);
date.setText(dateString);
DecimalFormat df = new DecimalFormat(".##");
float mint = 500, maxt = 0;
String mint1 = "", maxt1 = "";
for (WeatherData data : dayWeather)
{
if (mint > Float.parseFloat(data.getMinTemp()))
{
mint = Float.parseFloat(data.getMinTemp());
mint1 = df.format(mint);
Log.d(TAG, "getView: mint : " + mint);
}
if (maxt > Float.parseFloat(data.getMaxTemp()))
{
maxt = Float.parseFloat(data.getMaxTemp());
maxt1 = df.format(maxt);
}
}
minTempFoDay.setText(mint1);
maxTempFoDay.setText(maxt1);
WeatherAdapter weatherAdapter = new WeatherAdapter(context, R.layout.weather_holder, dayWeather);
weatherHolderListView.setAdapter(weatherAdapter);
return convertView;
}
}

RecyclerView Returning 'true' instead of JSON

My RecyclerView is returning the Boolean value 'true' for some odd reason.
I can't seem to fix the issue
This is the output I am getting
It should display text from the JSON
JSON LINK - https://newsapi.org/v2/top-headlines?sources=cnn&apiKey=c80ddd850a524fe5975cad881d6f4aba
I am accessing the 'articles' JSON array and I want to display the title
MainActivity code:
public class MainActivity extends AppCompatActivity {
RecyclerView mRecyclerView;
private RecyclerView.LayoutManager mLayoutManager;
MyAdapter mViewAdapter;
List<News> news_list = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new ParseNewsJSON().execute();
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
mRecyclerView.setHasFixedSize(true);
//mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
mViewAdapter = new MyAdapter(new ArrayList<News>());
mRecyclerView.setAdapter(mViewAdapter);
}
public class ParseNewsJSON extends AsyncTask<String, Void, String> {
private final String JSON_URL = "https://newsapi.org/v2/top-headlines?sources=cnn&apiKey=c80ddd850a524fe5975cad881d6f4aba";
String result = "";
ArrayList<String> article_heading = new ArrayList<>();
#Override
protected String doInBackground(String... strings) {
try {
URL url = new URL(JSON_URL);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(inputStream);
int data = reader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = reader.read();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
protected void onPostExecute(String s) {
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray("articles");
for (int i = 0; i < jsonArray.length(); i++) {
News news = new News();
news.setHeading(String.valueOf(article_heading.add(jsonArray.getJSONObject(i).optString("title"))));
// article_heading.add(jsonArray.getJSONObject(i).optString("title"));
Log.d("news_JSON", article_heading.toString());
Log.d("news", news.getHeading().toString());
news_list.add(news);
}
} catch (JSONException e) {
e.printStackTrace();
}
mViewAdapter = new MyAdapter(news_list);
mRecyclerView.setAdapter(mViewAdapter);
mViewAdapter.notifyDataSetChanged();
super.onPostExecute(s);
}
}
}
MyAdapter Code:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<News> newsArticleList;
public class ViewHolder extends RecyclerView.ViewHolder{
public TextView title;
//description, genre;
public ViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.textView_articleHeading);
// description = (TextView) itemView.findViewById(R.id.textView_description);
// image = (TextView) itemView.findViewById(R.id.rating);
}
}
public MyAdapter (List<News> newsArticleList){
this.newsArticleList = newsArticleList;
}
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.content_main, parent, false);
return new ViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyAdapter.ViewHolder holder, int position) {
News news = newsArticleList.get(position);
holder.title.setText(news.getHeading());
}
#Override
public int getItemCount() {
return newsArticleList.size();
}
}
News.Java;
public class News {
private String heading;
//private String descrpiton;
private String img;
public String getHeading() {
return heading;
}
public void setHeading(String heading) {
this.heading = heading;
}
public String getImg() {
return img;
}
public void setImg(String img) {
this.img = img;
}
}

Your problem is here
news.setHeading(String.valueOf(article_heading.add(jsonArray.getJSONObject(i).optString("title"))));
article_heading is an ArrayList, the method add returns a boolean to whether the list has changed due to your call or not.
You are not adding the title, you are adding the return of the ArrayList method, what you need is to change that line to that
String title = jsonArray.getJSONObject(i).optString("title");
article_heading.add(title);
news.setHeading(title);

change your onPostExecute as below
protected void onPostExecute(String s) {
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray("articles");
for (int i = 0; i < jsonArray.length(); i++) {
News news = new News();
String headingFromJson = jsonArray.getJSONObject(i).getString("title");
article_heading.add(headingFromJson);
news.setHeading(headingFromJson);
// article_heading.add(jsonArray.getJSONObject(i).optString("title"));
Log.d("news_JSON", article_heading.toString());
Log.d("news", news.getHeading().toString());
news_list.add(news);
}
} catch (JSONException e) {
e.printStackTrace();
}
mViewAdapter = new MyAdapter(news_list);
mRecyclerView.setAdapter(mViewAdapter);
mViewAdapter.notifyDataSetChanged();
super.onPostExecute(s);
}

You are setting the heading of the news in a wrong way.
You should be doing the following in your Aynctask:
news.setHeading(jsonArray.getJsonObject(i).getString("title"));
You are instead putting the title inside the arraylist using add method. And putting the result of the add method as the heading. Add method of arraylist returns a boolean value indicating if the addition to list was successful or not. Thus you keep getting true instead of the actual text

Try this:
In yout ParseNewsJSON class onpostexecute()
Change to :
for (int i = 0; i < jsonArray.length(); i++) {
News news = new News();
news.setHeading(jsonArray.getJSONObject(i).optString("title"));
news_list.add(news);
}
Instead of:
for (int i = 0; i < jsonArray.length(); i++) {
News news = new News();
news.setHeading(String.valueOf(article_heading.add(jsonArray.getJSONObject(i).optString("title"))));
// article_heading.add(jsonArray.getJSONObject(i).optString("title"));
Log.d("news_JSON", article_heading.toString());
Log.d("news", news.getHeading().toString());
news_list.add(news);
}

filtering listview results after selecting spinner value

I have 3 spinners in my project named standard, division and age. They contain values from json data. When I select a value from each individual spinner it shows all data of students in a listview respectivly (fetched from json).
I'm working with the following JSON data:
[
{
"name":"aarti",
"surname":"singh",
"age":"18",
"div":"A",
"standard":"7"
},
{
"name":"seema",
"surname":"desai",
"age":"17",
"div":"B",
"standard":"7"
},
{
"name":"tina",
"surname":"joshi",
"age":"18",
"div":"A",
"standard":"8"
},
{
"name":"megha",
"surname":"kale",
"age":"17",
"div":"A",
"standard":"7"
},
{
"name":"swati",
"surname":"marathe",
"age":"18",
"div":"A",
"standard":"8"
},
{
"name":"rekha",
"surname":"surve",
"age":"17",
"div":"A",
"standard":"7"
},
{
"name":"madhu",
"surname":"dalvi",
"age":"18",
"div":"B",
"standard":"6"
}
I am trying to do it like this way:
When I select standard 7 from the spinner it should display students information studying in 7th standard ("aarti", "seema", "megha", "rekha") and their other information too.
Then I am selecting value from division spinner say "A", it should take above result granted and accordingly display students from standard 7 and division "A". It should shows the result as ("aarti", "megha", "rekha") and their other informations too.
Finally when I am selecting value from age spinner say "17", it should take above result granted and accordingly display students from standard 7 and division "A" and age "17". Accordingly it shows "megha" and "rekha".
Can anyone please assist me
This is my MainActivity.java class:
public class MainActivity extends AppCompatActivity {
ArrayList<String> AllStandards = new ArrayList<>();
ArrayList<String> AllDivision = new ArrayList<>();
ArrayList<String> AllAge = new ArrayList<>();
JSONArray jsonArray;
Spinner spinner_std, spinner_div, spinner_age;
private ArrayList<StudInfo> studentVOList = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final List<String> item_Std = getStandard("data.json");
final List<String> items_div = getDivision("data.json");
final List<String> items_age = getAge("data.json");
/*spinner for standard*/
spinner_std = (Spinner) findViewById(R.id.spinnerStandard);
ArrayAdapter<String> adapter_std = new ArrayAdapter<String>(this, R.layout.spinner_standard_layout, R.id.textViewStandard, item_Std);
adapter_std.getFilter().filter(txt);
spinner_std.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
try {
String standard = AllStandards.get(i);
if (studentVOList.size() > 0)
studentVOList.clear();
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject jsonObject = jsonArray.getJSONObject(j);
String stand = jsonObject.getString("standard");
if (stand.equalsIgnoreCase(standard)) {
StudInfo studentVO = new StudInfo();
studentVO.setName(jsonObject.getString("name"));
studentVO.setSurname(jsonObject.getString("surname"));
studentVO.setAge(jsonObject.getString("age"));
studentVO.setDiv(jsonObject.getString("div"));
studentVO.setStandard(jsonObject.getString("standard"));
studentVO.setStandard(stand);
studentVOList.add(studentVO);
}
}
// Log.d("TAG", "List With All Students in selected standard: " + studentVOList.size());
Intent intent = new Intent(getApplicationContext(), StudentsInfo.class);
Bundle b = new Bundle();
b.putSerializable("list", studentVOList);
intent.putExtra("bundle", b);
startActivity(intent);
} catch (JSONException e) {
e.printStackTrace();
}
}
public void onNothingSelected(AdapterView<?> arg0) {
}
});
spinner_std.setAdapter(adapter_std);
/*spinner for division*/
spinner_div = (Spinner) findViewById(R.id.spinnerDiv);
ArrayAdapter<String> adapter_div = new ArrayAdapter<String>(this, R.layout.spinner_division_layout, R.id.textViewDivision, items_div);
adapter_div.getFilter().filter(txt);
spinner_div.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
try {
String division = AllDivision.get(i);
if (studentVOList.size() > 0)
studentVOList.clear();
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject jsonObject = jsonArray.getJSONObject(j);
String div = jsonObject.getString("div");
// Collections.sort(AllDivision);
if (div.equalsIgnoreCase(division)) {
StudInfo studentVO = new StudInfo();
studentVO.setName(jsonObject.getString("name"));
studentVO.setSurname(jsonObject.getString("surname"));
studentVO.setAge(jsonObject.getString("age"));
studentVO.setStandard(jsonObject.getString("standard"));
studentVO.setDiv(jsonObject.getString("div"));
studentVO.setDiv(div);
studentVOList.add(studentVO);
}
}
Intent intent = new Intent(getApplicationContext(), StudentsInfo.class);
Bundle b = new Bundle();
b.putSerializable("list", studentVOList);
intent.putExtra("bundle", b);
startActivity(intent);
} catch (JSONException e) {
e.printStackTrace();
}
}
public void onNothingSelected(AdapterView<?> arg0) {
}
});
spinner_div.setAdapter(adapter_div);
/*spinner for age*/
spinner_age = (Spinner) findViewById(R.id.spinerAge);
ArrayAdapter<String> adapter_age = new ArrayAdapter<String>(this, R.layout.spinner_age_layout, R.id.textViewAge, items_age);
adapter_age.getFilter().filter(txt);
spinner_age.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
try {
String age = AllAge.get(i);
if (studentVOList.size() > 0)
studentVOList.clear();
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject jsonObject = jsonArray.getJSONObject(j);
String age_list = jsonObject.getString("age");
Collections.sort(AllAge);
if (age_list.equalsIgnoreCase(age)) {
StudInfo studentVO = new StudInfo();
studentVO.setName(jsonObject.getString("name"));
studentVO.setSurname(jsonObject.getString("surname"));
studentVO.setDiv(jsonObject.getString("div"));
studentVO.setStandard(jsonObject.getString("standard"));
studentVO.setAge(jsonObject.getString("age"));
studentVO.setAge(age_list);
studentVOList.add(studentVO);
}
}
Intent intent = new Intent(getApplicationContext(), StudentsInfo.class);
Bundle b = new Bundle();
b.putSerializable("list", studentVOList);
intent.putExtra("bundle", b);
startActivity(intent);
} catch (JSONException e) {
e.printStackTrace();
}
}
public void onNothingSelected(AdapterView<?> arg0) {
}
});
spinner_age.setAdapter(adapter_age);
}//onCreate Method
private List<String> getStandard(String fileName) {
jsonArray = null;
try {
InputStream is = getResources().getAssets().open(fileName);
int size = is.available();
byte[] data = new byte[size];
is.read(data);
is.close();
String json = new String(data, "UTF-8");
// AllStandards.clear();
try {
jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String stand = jsonObject.getString("standard");
if (!AllStandards.contains(stand)) {
AllStandards.add(stand);
}
}
} catch (JSONException je) {
je.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
return AllStandards;
}
private List<String> getDivision(String fileName) {
jsonArray = null;
try {
InputStream is = getResources().getAssets().open(fileName);
int size = is.available();
byte[] data = new byte[size];
is.read(data);
is.close();
String json = new String(data, "UTF-8");
try {
jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String stand = jsonObject.getString("div");
if (!AllDivision.contains(stand)) {
AllDivision.add(stand);
}
}
} catch (JSONException je) {
je.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
return AllDivision;
}
private List<String> getAge(String fileName) {
jsonArray = null;
try {
InputStream is = getResources().getAssets().open(fileName);
int size = is.available();
byte[] data = new byte[size];
is.read(data);
is.close();
String json = new String(data, "UTF-8");
try {
jsonArray = new JSONArray(json);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String stand = jsonObject.getString("age");
if (!AllAge.contains(stand)) {
AllAge.add(stand);
}
}
} catch (JSONException je) {
je.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
return AllAge;
}
this is my ListAdapter.java class
public class ListAdapter extends ArrayAdapter<StudInfo> {
int vg;
ArrayList<StudInfo> list;
Context context;
public ListAdapter(Context context, int vg, int id, ArrayList<StudInfo> list) {
super(context, vg, id, list);
this.context = context;
this.vg = vg;
this.list = list;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(vg, parent, false);
TextView textViewName = (TextView) itemView.findViewById(R.id.txtName);
TextView textViewSurname = (TextView)itemView.findViewById(R.id.txtSurname);
TextView textViewAge = (TextView) itemView.findViewById(R.id.txtAge);
TextView textViewDiv = (TextView) itemView.findViewById(R.id.txtDiv);
TextView textViewStd = (TextView) itemView.findViewById(R.id.txtStandard);
textViewName.setText(list.get(position).getName());
textViewSurname.setText(list.get(position).getSurname());
textViewAge.setText(list.get(position).getAge());
textViewDiv.setText(list.get(position).getDiv());
textViewStd.setText(list.get(position).getStandard());
return itemView;
}
}
this is my StudentsInfo.java class
public class StudentsInfo extends Activity {
ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.studentsinfo_layout);
Bundle b = getIntent().getBundleExtra("bundle");
ArrayList<StudInfo> studentVOList = (ArrayList<StudInfo>) b.getSerializable("list");
ListView listView = (ListView) findViewById(R.id.listViewShow);
ListAdapter listAdapter = new ListAdapter(this, R.layout.list_layout, R.id.txtName, studentVOList);
listView.setAdapter(listAdapter);
}
}
this is my StudInfo.java class,
import java.io.Serializable;
public class StudInfo implements Serializable
{
private String name;
private String surname;
private String age;
private String div;
private String standard;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getDiv() {
return div;
}
public void setDiv(String div) {
this.div = div;
}
public String getStandard() {
return standard;
}
public void setStandard(String standard) {
this.standard = standard;
}
}
i tried googling to find out solution but the questions i found all are based on searching listview items using edittext.i didn't found ant similar post matching with my question which solve my problem.can anyone please help me to solve this??

1. Override getFilter method in your adapter class
2. Use adapter.getFilter().filter(txt) in your spinner selection
package com.hughesnet.adapters;
import com.hughesnet.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.TextView;
import java.util.ArrayList;
public class ListAdapter extends ArrayAdapter<StudInfo> {
int vg;
ArrayList<StudInfo> list;
Context context;
ItemFilter mFilter;
ArrayList<StudInfo> filteredData;
public ListAdapter (Context context, int vg, int id, ArrayList<StudInfo> list) {
super (context, vg, id, list);
this.context = context;
this.vg = vg;
this.list = list;
}
public View getView (int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService (Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate (vg, parent, false);
TextView textViewName = (TextView) itemView.findViewById (R.id.txtName);
TextView textViewSurname = (TextView) itemView.findViewById (R.id.txtSurname);
TextView textViewAge = (TextView) itemView.findViewById (R.id.txtAge);
TextView textViewDiv = (TextView) itemView.findViewById (R.id.txtDiv);
TextView textViewStd = (TextView) itemView.findViewById (R.id.txtStandard);
textViewName.setText (list.get (position).getName ());
textViewSurname.setText (list.get (position).getSurname ());
textViewAge.setText (list.get (position).getAge ());
textViewDiv.setText (list.get (position).getDiv ());
textViewStd.setText (list.get (position).getStandard ());
return itemView;
}
ItemFilter mFilter = new ItemFilter ();
public Filter getFilter () {
return mFilter;
}
private class ItemFilter extends Filter {
#Override
protected FilterResults performFiltering (CharSequence constraint) {
String filterString = constraint.toString ().toLowerCase ();
FilterResults results = new FilterResults ();
int count = list.size ();
final ArrayList<StudInfo> nlist = new ArrayList<StudInfo> (count);
String filterableString;
for (int i = 0; i < count; i++) {
StudInfo info = list.get (i);
// Check for standard, division and age here
if (info.getAge().contains(filterString) || info.getStandard().contains(filterString ) || info.getDiv().contains(filterString )) {
nlist.add (filterableString);
}
}
results.values = nlist;
results.count = nlist.size ();
return results;
}
#SuppressWarnings("unchecked")
#Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filteredData = (ArrayList<StudInfo>) results.values;
notifyDataSetChanged();
}
}
}

Android-Error messages with intent within Adapter

I am trying to get the maps intent working within my Json Adapter. But somehow I am always getting the Error message :
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.Context.startActivity(android.content.Intent)' on a null object reference
This is my second Android Project and I can't find my mistake.
I hope some of you guys can help me.
class JSONAdapter extends BaseAdapter implements ListAdapter{
private final Activity activity;
private Context context;
private final JSONArray jsonArray;
JSONAdapter(Activity activity, JSONArray jsonArray) {
assert activity != null;
assert jsonArray != null;
this.jsonArray = jsonArray;
this.activity = activity;
}
#Override public int getCount() {
if(null==jsonArray)
return 0;
else
return jsonArray.length();
}
#Override public JSONObject getItem(int position) {
if(null==jsonArray) return null;
else
return jsonArray.optJSONObject(position);
}
#Override public long getItemId(int position) {
JSONObject jsonObject = getItem(position);
return jsonObject.optLong("id");
}
#Override public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null)
convertView = activity.getLayoutInflater().inflate(R.layout.row, null);
TextView tBrand =(TextView)convertView.findViewById(R.id.tvbrand);
TextView tStreet =(TextView)convertView.findViewById(R.id.tvstreet);
final TextView tPrice = (TextView)convertView.findViewById(R.id.tvprice);
final TextView tPlace = (TextView)convertView.findViewById(R.id.tvplace);
TextView tOpen = (TextView)convertView.findViewById(R.id.tvopen);
JSONObject json_data = getItem(position);
if(null!=json_data ) {
String brand = null;
String street = null;
String price = null;
String houseNumber = null;
String place = null;
String postCode = null;
boolean open = false;
Double statLng = null;
Double statLat = null;
try {
brand = json_data.getString("brand");
street = json_data.getString("street");
price = Double.toString(json_data.getDouble("price"));
houseNumber = json_data.getString("houseNumber");
place = json_data.getString("place");
postCode = json_data.getString("postCode");
open = json_data.getBoolean("isOpen");
statLng = json_data.getDouble("lng");
statLat = json_data.getDouble("lat");
} catch (JSONException e) {
e.printStackTrace();
}
if (houseNumber.equals("null")) {
houseNumber = "";
}
tBrand.setText(brand);
tPrice.setText(price + "€");
tStreet.setText(street + " " + houseNumber);
tPlace.setText(postCode + " " + place);
if (open == true) {
tOpen.setText("geöffnet");
tOpen.setTextColor(Color.GREEN);
} else {
tOpen.setText("geschlossen");
tOpen.setTextColor(Color.RED);
}
final Double finalStatLng = statLng;
final Double finalStatLat = statLat;
tPrice.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Uri gmmIntentUri = Uri.parse("google.navigation:q=" + finalStatLat + "," + finalStatLng);
Intent mapIntent = new Intent(Intent.ACTION_VIEW, gmmIntentUri);
mapIntent.setPackage("com.google.android.apps.maps");
context.startActivity(mapIntent);
}
});
}
return convertView;
}

You have missed to assign value to context
context = activity; or use activity.startActivity(mapIntent);

How to get value in listview in android

I want to show json data in listview.The json array is shown in
console.but i am not able to set the adapter value in listview.It
always return null value.
final ListView category_listview = (ListView)findViewById(R.id.category_dashboard_list);
category_detail = new Category_Dashboard_Adapter(getApplicationContext(), R.layout.category_row_list, cate_list);
category_listview.setAdapter(category_detail);
try {
jsono = new JSONObject(jsonvalue);
jarray = jsono.getJSONArray("jsonvalue");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
try
{
// object = jarray.getJSONObject(i);
Category_Detail_Model category_obj = new Category_Detail_Model();
category_obj.setCategory_Title(object.getString("bookmark_title"));
category_obj.setCategory_Description(object.getString("bookmark_title"));
category_obj.setCategory_Url(object.getString("bookmark_website"));
category_obj.setImage(object.getString("bookmark_preview_image"));
cate_list.add(category_obj);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
catch (JSONException e)
{
e.printStackTrace();
}
Here category_listview.setAdapter(category_detail); giving null value.
Here model file is
public class Category_Detail_Model{
private String category_title;
private String category_description;
private String category_url;
private String category_image;
public Category_Detail_Model() {
// TODO Auto-generated constructor stub
}
public Category_Detail_Model(String category_title, String category_description, String category_url, String category_image) {
super();
this.category_title = category_title;
this.category_description = category_description;
this.category_url =category_url;
this.category_image = category_image;
}
public String getCategory_Title() {
return category_title;
}
public void setCategory_Title(String category_title) {
this.category_title = category_title;
}
public String getCategory_Description() {
return category_description;
}
public void setCategory_Description(String category_description) {
this.category_description = category_description;
}
public String getCategory_Url() {
return category_url;
}
public void setCategory_Url(String category_url) {
this.category_url = category_url;
}
public String getCategory_Image() {
return category_image;
}
public void setImage(String category_image) {
this.category_image = category_image;
}
}
And here is Adapter class code
public class Category_Dashboard_Adapter extends ArrayAdapter<Category_Detail_Model> {
ArrayList<Category_Detail_Model> category_detail_list;
LayoutInflater vi;
int Resource;
ViewHolder holder;
Typeface font1 = Typeface.createFromAsset(getContext().getAssets(), "fonts/cabin.regular.ttf");
public Category_Dashboard_Adapter(Context context1, int resource1, ArrayList<Category_Detail_Model> objects1) {
super(context1, resource1, objects1);
vi = (LayoutInflater) context1
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource1;
category_detail_list = objects1;
}
public View getView(int position1, View convertView1, ViewGroup parent1)
{
// convert view = design
View v = convertView1;
if (v == null) {
holder = new ViewHolder();
v = vi.inflate(Resource, null);
holder.category_imageview = (ImageView) v.findViewById(R.id.category_details_ivImage);
holder.category_title_holder = (TextView) v.findViewById(R.id.category_detail_title_view);
holder.category_desc_holder = (TextView) v.findViewById(R.id.category_detail_desc_view);
holder.category_url_holder = (TextView) v.findViewById(R.id.category_detail_url_view);
holder.category_title_holder.setTypeface(font1); holder.category_title_holder.setTextSize(16.0f);
holder.category_desc_holder.setTypeface(font1); holder.category_desc_holder.setTextSize(14.0f);
holder.category_url_holder.setTypeface(font1); holder.category_url_holder.setTextSize(10.0f);
// holder.txtCategory.setTypeface(font1); holder.txtCategory.setTextSize(10.0f);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
new CategoryDownloadImageTask(holder.category_imageview).execute(category_detail_list.get(position1).getCategory_Image());
holder.category_title_holder.setText(category_detail_list.get(position1).getCategory_Title());
holder.category_desc_holder.setText(category_detail_list.get(position1).getCategory_Description());
holder.category_url_holder.setText(category_detail_list.get(position1).getCategory_Url());
return v;
}
static class ViewHolder {
public ImageView category_imageview;
public TextView category_title_holder;
public TextView category_desc_holder;
public TextView category_url_holder;
}
}

Bacause you set value for the adapter before load json so it give null values:
Try this:
final ListView category_listview = (ListView)findViewById(R.id.category_dashboard_list);
try {
jsono = new JSONObject(jsonvalue);
jarray = jsono.getJSONArray("jsonvalue");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
try
{
// object = jarray.getJSONObject(i);
Category_Detail_Model category_obj = new Category_Detail_Model();
category_obj.setCategory_Title(object.getString("bookmark_title"));
category_obj.setCategory_Description(object.getString("bookmark_title"));
category_obj.setCategory_Url(object.getString("bookmark_website"));
category_obj.setImage(object.getString("bookmark_preview_image"));
cate_list.add(category_obj);
category_detail = new Category_Dashboard_Adapter(getApplicationContext(), R.layout.category_row_list, cate_list);
category_listview.setAdapter(category_detail);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
catch (JSONException e)
{
e.printStackTrace();
}
Or maybe you forget to init your ArrayList before set json data to it. Remember to do this:
ArrayList<String> cate_list = new ArrayList<>();
before you set data for it.

You are parsing your json and adding data to your cate_list after setting the adapter. Add the code for setting data to ListView after you parse your json:
try {
jsono = new JSONObject(jsonvalue);
jarray = jsono.getJSONArray("jsonvalue");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
try
{
// object = jarray.getJSONObject(i);
Category_Detail_Model category_obj = new Category_Detail_Model();
category_obj.setCategory_Title(object.getString("bookmark_title"));
category_obj.setCategory_Description(object.getString("bookmark_title"));
category_obj.setCategory_Url(object.getString("bookmark_website"));
category_obj.setImage(object.getString("bookmark_preview_image"));
cate_list.add(category_obj);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
catch (JSONException e)
{
e.printStackTrace();
}
final ListView category_listview = (ListView)findViewById(R.id.category_dashboard_list);
category_detail = new Category_Dashboard_Adapter(getApplicationContext(), R.layout.category_row_list, cate_list);
category_listview.setAdapter(category_detail);