I'm trying to display images in respective ImageViews of a listView created using Simple Adapter. So far the images are downloading fine to a location on disk, and text data is displaying fine in the listView but I'm having trouble displaying the downloaded images to the correct positions of the listView items. My code looks like this so far...
public class MainActivity extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// More Code Here
...
productList = new ArrayList<HashMap<String, Object>>();
this.getListView().setOnScrollListener(new EndlessScrollListener() {
#Override
public void onLoadMore(int page, int totalItemsCount) {
// Triggered only when new data needs to be appended to the list
// Add whatever code is needed to append new items to your
// AdapterView
customLoadMoreDataFromApi(page);
// or customLoadMoreDataFromApi(totalItemsCount);
}
});
addInitialLoader();
addKeyListener();
// Get listview
lv = getListView();
}
// Append more data into the adapter
public void customLoadMoreDataFromApi(int offset) {
// This method probably sends out a network request and appends new data items to your adapter.
// Use the offset value and add it as a parameter to your API request to retrieve paginated data.
// Deserialize API response and then construct new objects to append to the adapter
//Toast.makeText(MainActivity.this,
//"...loading more items" + offset + "...",
//Toast.LENGTH_LONG).show();
final Toast tost2 = Toast.makeText(MainActivity.this,
"...loading more items" + offset + "...",
Toast.LENGTH_LONG);
tost2.show();
Handler handler2 = new Handler();
handler2.postDelayed(new Runnable() {
#Override
public void run() {
tost2.cancel();
}
}, 1000);
}
public void addInitialLoader() {
// get Internet status
isInternetPresent = cd.isConnectingToInternet();
// check for Internet status
if (isInternetPresent) {
// Internet Connection is Present
// make HTTP requests
new JSONParse().execute();
return;
} else {
// Internet connection is not present
// Ask user to connect to Internet
showAlertDialog(MainActivity.this,
"No Internet Connection",
"You don't have internet connection.", false);
}
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
// Some code Here
...
}
#Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Clear previous list items
productList.clear();
// Getting JSON from URL
JSONObject json = jParser.makeHttpRequest(url,
"GET", params);
if (json != null) {
try {
// Getting JSON Array
Iterator<String> keys = json.keys();
while (keys.hasNext()) {
String key = keys.next();
String pid = "";
String img = "";
String weight = "";
String name = "";
String desciption = "";
String price = "";
int maxLen = 15;
int maxLen2 = 20;
JSONObject c = json.getJSONObject(key);
String err = c.getString(TAG_ERROR) == "false" ? "" : "true";
if (err == "true") {
pid = "0";
img = "0";
weight = "0";
name = "None";
desciption = "none";
price = "none";
} else {
pid = c.getString(TAG_PID);
img = c.getString(TAG_IMAG);
weight = c.getString(TAG_SIZE);
name = c.getString(TAG_NAME);
desciption = c.getString(TAG_DESCR);
price = c.getString(TAG_PRICE);
}
// tmp hashmap for single contact
HashMap<String, Object> cartitem = new HashMap<String, Object>();
// adding each child node to HashMap key => value
cartitem.put(TAG_PID, pid);
cartitem.put(TAG_IMAG, R.drawable.logo);
cartitem.put(TAG_IMP, img);
cartitem.put(TAG_SIZE, "Size: " + qty);
cartitem.put(TAG_NAME, name);
cartitem.put(TAG_DESCR, desciption);
cartitem.put(TAG_SIZE, weight);
if (err == "") {
cartitem.put(TAG_PRICE, price);
} else {
cartitem.put(TAG_PRICE,
"Error: No cart to show or items are already delivered.");
}
// adding product details to product list
productList.add(cartitem);
}
} catch (JSONException e) {
Log.e("ERROR Exception: ", e.toString());
e.printStackTrace();
}
} else {
// Internet connection is not present
Log.e("ERROR Json: ", "No Internet Available");
}
return null;
}
#Override
protected void onPostExecute(JSONObject json) {
// protected void onPostExecute(Void result) {
super.onPostExecute(json);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
// Keys used in Hashmap
String[] from = { TAG_SIZE, TAG_NAME, TAG_DESCR, TAG_PRICE, TAG_PID };
// Ids of views in listview_layout
int[] to = { R.id.size, R.id.name, R.id.descr, R.id.price, R.id.pid };
ListAdapter adapter = new SimpleAdapter(MainActivity.this,
productList, R.layout.list_item, from, to);
setListAdapter(adapter);
//Log.i("Adapter Count:", ""+adapter.getCount());
for(int i=0;i<adapter.getCount();i++){
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get(TAG_IMP);
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
// HashMap<String, Object> hmDownload = new HashMap<String, Object>();
// Only put images that are set
String needle = "img/nophoto.png";
if(!needle.equals(imgUrl)) {
hm.put("img_path", imgUrl);
hm.put("position", i);
Log.i("HM:", hm.toString());
imageLoaderTask.execute(hm);
}
// Starting ImageLoaderTask to download and populate image in the listview
}
}
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>>{
#Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream=null;
String imgUrl = (String) hm[0].get("img_path");
//imgUrl = imgUrl.replace("\\/", "");
imgUrl = imgrl + imgUrl;
int position = (Integer) hm[0].get("position");
Log.i("IMGURL:", imgUrl);
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = Environment.getExternalStorageDirectory(); //getBaseContext().getCacheDir();
if (cacheDirectory.canWrite()){
File dir = new File (cacheDirectory.getAbsolutePath() + "/IMGDir");
dir.mkdirs();
// Temporary file to store the downloaded image
File tmpFile = new File(dir, "/myimg_"+position+".png");
Log.i("Temp:", cacheDirectory.getAbsolutePath());
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("img",tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position",position);
Log.i("HMB:", hmBitmap.toString());
// Returning the HashMap object containing the image path and position
return hmBitmap;
}
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(HashMap<String, Object> result) {
if(result != null) {
// Getting the path to the downloaded image
String path = (String) result.get("img");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Get listview
//lv = getListView();
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter) lv.getAdapter();
// Getting the hashmap object at the specified position of the listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(position);
Log.i("POS:", adapter.getItem(position).toString());
// Overwriting the existing path in the adapter
hm.put("image",path);
Log.i("POS 2:", adapter.getItem(position).toString());
// Noticing listview about the dataset changes
//setListAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
}
}
I appreciate any help in finding the connection
Thank you in advance
SimpleAdapter does not have the capability for the "scroll for more" dynamic updating you are trying to do. From the docs:
An easy adapter to map static data to views defined in an XML file.
Once you pass in the list of maps for the data, there's no way for SimpleAdapter to notice that you've updated that list.
Also, to effectively display images even with static data, you need use a subclass with setViewImage overridden or define a ViewBinder that can map images and call adapter.setViewBinder so that the adapter knows how to bind an image to your data.
To achieve what you are trying to do, you will need to create a subclass of BaseAdapter so that you can dynamically add data and correctly bind images to the ImageView.
Related
I've a custom list in Android that collects data using Json.Sometimes correctly load the app list and the other is closed. The error in logcat is:
https://www.dropbox.com/s/yywp1aa6vlc66y4/error_list.png
And my code is:
public class Lista_productos extends Activity{
ListView mListView;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.lista_producto);
// URL to the JSON data
int section = 1;
String strUrl = "http://server/file.php?valor="+section;
// Creating a new non-ui thread task to download json data
DownloadTask downloadTask = new DownloadTask();
// Starting the download process
downloadTask.execute(strUrl);
// Getting a reference to ListView of activity_main
mListView = (ListView) findViewById(R.id.listaJson);
Button Buttonback = (Button) findViewById(R.id.back);
Buttonback.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String>{
String data = null;
private ProgressDialog dialog;
protected void onPreExecute() {
dialog = ProgressDialog.show(Lista_productos.this, "", "Cargando...", true);
}
#Override
protected String doInBackground(String... url) {
try{
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
#Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
dialog.dismiss();
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter>{
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
#Override
protected SimpleAdapter doInBackground(String... strJson) {
try{
jObject = new JSONObject(strJson[0]);
JSONParser DealJsonParser = new JSONParser();
DealJsonParser.parse(jObject);
}catch(Exception e){
Log.d("JSON Exception1",e.toString());
}
// Instantiating json parser class
JSONParser DealJsonParser = new JSONParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> deal = null;
try{
// Getting the parsed data as a List construct
deal = DealJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
// Keys used in Hashmap
String[] from = { "flag","details","precionuevo","descripcion","total","codeqr","latitud","longitud","unidades","telefono"};
// Ids of views in listview_layout
int[] to = { R.id.dealimage,R.id.details,R.id.price,R.id.descripcion,R.id.total,R.id.codeqr,R.id.latitud,R.id.longitud,R.id.unidades,R.id.telefono};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), deal, R.layout.list_view, from, to);
return adapter;
}
/** Invoked by the Android on "doInBackground" is executed */
#Override
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
mListView.setAdapter(adapter);
for(int i=0;i<adapter.getCount();i++){
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path",imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in the listview
imageLoaderTask.execute(hm);
}
mListView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> a, View view, int position, long id) {
// TODO Auto-generated method stub
String URL = ((TextView) view.findViewById(R.id.descripcion)).getText().toString();//this will take the value of the invincible textView
ImageView imageview = (ImageView) view.findViewById(R.id.dealimage);
imageview.buildDrawingCache();
Bitmap bmap = imageview.getDrawingCache();
Intent i = new Intent(Lista_productos.this, pruebalista.class);
Bundle extras = new Bundle();
// extras.putParcelable("imagebitmap", image);
i.putExtra("BitmapImage", bmap);
i.putExtras(extras);
i.putExtra("URL", URL);
startActivity(i);
}
});
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>>{
#Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream=null;
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+position+".png");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("flag",tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position",position);
// Returning the HashMap object containing the image path and position
return hmBitmap;
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("flag");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter ) mListView.getAdapter();
// Getting the hashmap object at the specified position of the listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(position);
// Overwriting the existing path in the adapter
hm.put("flag",path);
// Noticing listview about the dataset changes
adapter.notifyDataSetChanged();
}
}
}
}
Does anyone have any idea to solve this? Thanks!
Try this..
I Guess You need to initialize the listview before calling the DownloadTask
// Getting a reference to ListView of activity_main
mListView = (ListView) findViewById(R.id.listaJson);
Button Buttonback = (Button) findViewById(R.id.back);
// Creating a new non-ui thread task to download json data
DownloadTask downloadTask = new DownloadTask();
// Starting the download process
downloadTask.execute(strUrl);
Same like that you no need to create OnItemClickListener inside Asynctask
mListView.setOnItemClickListener(new OnItemClickListener() {
You need to do it inside OnCreate
I got all the data ... But I am not able to use webview url(UrlWeb) , i mean when i click on list item then it will open in web view. when i click any list it should pass corresponding url to the WebView activity.So how to achieve this, how to store corresponding url?? please someone help me..
My MainActivity :
public class MainActivity extends Activity {
ListView mListView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// URL to the JSON data
String strUrl = "http://www.mulnivasisangh.com/aman/listweb.json";
// Creating a new non-ui thread task to download json data
DownloadTask downloadTask = new DownloadTask();
// Starting the download process
downloadTask.execute(strUrl);
// Getting a reference to ListView of activity_main
mListView = (ListView) findViewById(R.id.lv_countries);
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String>{
String data = null;
#Override
protected String doInBackground(String... url) {
try{
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
#Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter>{
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
#Override
protected SimpleAdapter doInBackground(String... strJson) {
try{
jObject = new JSONObject(strJson[0]);
CountryJSONParser countryJsonParser = new CountryJSONParser();
countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("JSON Exception1",e.toString());
}
// Instantiating json parser class
CountryJSONParser countryJsonParser = new CountryJSONParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> countries = null;
try{
// Getting the parsed data as a List construct
countries = countryJsonParser.parse(jObject);
}catch(Exception e){
Log.d("Exception",e.toString());
}
// Keys used in Hashmap
String[] from = { "country","flag","details", "URL"};
// Ids of views in listview_layout
int[] to = { R.id.tv_country,R.id.iv_flag,R.id.tv_country_details,R.id.tv_URL};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), countries, R.layout.lv_layout, from, to);
return adapter;
}
/** Invoked by the Android on "doInBackground" is executed */
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
mListView.setAdapter(adapter);
for(int i=0;i<adapter.getCount();i++){
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path",imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in the listview
imageLoaderTask.execute(hm);
}
mListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view, int arg2,
long arg3) {
// TODO Auto-generated method stub
String URL = ((TextView) view.findViewById(R.id.tv_URL)).getText().toString();//this will take the value of the invincible textView
Intent i = new Intent(MainActivity.this, WebViewActivity.class);
i.putExtra("URL", URL);
startActivity(i);
}
});
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>>{
#Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream=null;
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+position+".png");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("flag",tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position",position);
// Returning the HashMap object containing the image path and position
return hmBitmap;
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("flag");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter ) mListView.getAdapter();
// Getting the hashmap object at the specified position of the listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(position);
// Overwriting the existing path in the adapter
hm.put("flag",path);
// Noticing listview about the dataset changes
adapter.notifyDataSetChanged();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
My CountryJSONParser :
public class CountryJSONParser {
// Receives a JSONObject and returns a list
public List<HashMap<String,Object>> parse(JSONObject jObject){
JSONArray jCountries = null;
try {
// Retrieves all the elements in the 'countries' array
jCountries = jObject.getJSONArray("webs");
} catch (JSONException e) {
e.printStackTrace();
}
// Invoking getCountries with the array of json object
// where each json object represent a country
return getCountries(jCountries);
}
private List<HashMap<String, Object>> getCountries(JSONArray jCountries){
int countryCount = jCountries.length();
List<HashMap<String, Object>> countryList = new ArrayList<HashMap<String,Object>>();
HashMap<String, Object> country = null;
// Taking each country, parses and adds to list object
for(int i=0; i<countryCount;i++){
try {
// Call getCountry with country JSON object to parse the country
country = getCountry((JSONObject)jCountries.get(i));
countryList.add(country);
} catch (JSONException e) {
e.printStackTrace();
}
}
return countryList;
}
// Parsing the Country JSON object
private HashMap<String, Object> getCountry(JSONObject jCountry){
HashMap<String, Object> country = new HashMap<String, Object>();
String countryName = "";
String flag="";
String language = "";
String capital = "";
String web ="";
try {
countryName = jCountry.getString("Nom");
flag = jCountry.getString("UrlImatge");
language = jCountry.getString("Descripcio");
capital = jCountry.getString("Id");
web = jCountry.getString("UrlWeb");
String details = "Descripcio : " + language + "\n" +
"Id : " + capital + "\n" + "URL: " + web + "\n";
country.put("country", countryName);
country.put("UrlImatge", R.drawable.blank);
country.put("flag_path", flag);
country.put("details", details);
country.put("URL", web);
} catch (JSONException e) {
e.printStackTrace();
}
return country;
}
}
Thanks in advance..
I use this trick when I want to pass data from listview to another activity.
1- I add a textView to my item-list.xml which is R.layout.lv_layout in your case and make its visibility gone. android:visibility="gone"
2- add the URL String to this textView, it wont be shown in the listview, because it has no visibility.
String[] from = { "country","flag","details", "URL"};
// Ids of views in listview_layout
int[] to = { R.id.tv_country,R.id.iv_flag,R.id.tv_country_details, R.id.tv_country_URL};//the forth one is the textView you set it as gone.
3- in OnItemClick function just add the following:
String URL = ((TextView) view.findViewById(R.id.tv_country_URL)).getText().toString();//this will take the value of the invincible textView
Intent i = new Intent(MainActivity.this, WebView.class);
i.putExtra("URL", URL);
startActivity(i);
4- use getIntent in your webView Activity to get the URL and load it.
if it is still vague please inform me. hope you got the idea.
Edit
you dont need getURL function anymore, I thought getCountries doesnt return a hashMap for URL.
so all you have to do is create a invisible textView in your lv_layout and put each URL in it.
follow the 4 steps above.
for step 3 in Post:
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
mListView.setAdapter(adapter);
for(int i=0;i<adapter.getCount();i++){
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path",imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in the listview
imageLoaderTask.execute(hm);
}
mListView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View view, int arg2,
long arg3) {
// TODO Auto-generated method stub
String URL = ((TextView) view.findViewById(R.id.tv_URL)).getText().toString();//this will take the value of the invincible textView
Intent i = new Intent(MainActivity.this, WebView.class);
i.putExtra("URL", URL);
startActivity(i);
}
Edit
for webViewActivity you need to get extra from the previous activity as the following:
public class WebViewActivity extends Activity{
private WebView webView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.web_view);
webView = (WebView) findViewById(R.id.webview);
webView.setWebViewClient(new MyWebViewClient());
String url = getIntent().getExtras().getString("URL")
if (null != url) {
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl(url);
}
}
private class MyWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
}
public class TopMovie extends Activity
{
GridView lv;
Vibrator vibrator;
Dialog dialog;
private Activity activity;
private ArrayList<HashMap<String, String>> data;
private static LayoutInflater inflater=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
Log.i("Category", MainActivity.movie_Category);`enter code here`
setContentView(R.layout.new_movie);
setProgressBarIndeterminateVisibility(true);
setProgressBarIndeterminateVisibility(false);
vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
lv = (GridView) findViewById(R.id.grid_view);
// URL to the JSON data
String strUrl = "http://vaibhavtech.com/work/android/movie_list.php?category="
+ MainActivity.movie_Category + "&sub_category=other";
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(strUrl);
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// // TODO Auto-generated method stub
vibrator.vibrate(40);
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.customtoast,
(ViewGroup) findViewById(R.id.custom_toast_layout));
Toast toast = new Toast(getApplicationContext());
toast.setDuration(Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 0);
toast.setView(view);
toast.show();
MainActivity.movie_Id = ((TextView) arg1
.findViewById(R.id.tv_girdview_content_id)).getText()
.toString();
Log.i("Name is", MainActivity.movie_Id);
startActivity(new Intent(TopMovie.this, MovieDescription.class));
}
});
}
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(
iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception while downloading url", e.toString());
} finally {
iStream.close();
}
return data;
}
protected void onPreExecute() {
// SHOW THE SPINNER WHILE LOADING FEEDS
// linlaHeaderProgress.setVisibility(View.VISIBLE);
//super.onPreExecute();
dialog=dialog=ProgressDialog.show(TopMovie.this,"", "Loading...", true);
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String> {
String data = null;
#Override
protected String doInBackground(String... url) {
try {
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
#Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends
AsyncTask<String, Void, SimpleAdapter> {
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
#Override
protected SimpleAdapter doInBackground(String... strJson) {
try {
jObject = new JSONObject(strJson[0]);
MovieParser countryJsonParser = new MovieParser();
countryJsonParser.parse(jObject);
} catch (Exception e) {
Log.d("JSON Exception1", e.toString());
}
// Instantiating json parser class
MovieParser countryJsonParser = new MovieParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> countries = null;
try {
// Getting the parsed data as a List construct
countries = countryJsonParser.parse(jObject);
} catch (Exception e) {
Log.d("Exception", e.toString());
}
// Keys used in Hashmap
String[] from = { "image", "id", "year", "duration", "name" };
// Ids of views in listview_layout
// int[] to = {
// R.id.iv_radio_data_image,R.id.tv_radio_data_id,R.id.tv_radio_data_like,R.id.tv_radio_data_rating,R.id.tv_radio_data_listner,R.id.tv_radio_data_radio_url,R.id.tv_radio_data_name};
int[] to = { R.id.iv_girdview_content_image,
R.id.tv_girdview_content_id, R.id.tv_girdview_content_like,
R.id.tv_girdview_content_listner,
R.id.tv_girdview_content_name };
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(),
countries, R.layout.grid_view_content, from, to);
return adapter;
}
/** Invoked by the Android on "doInBackground" is executed */
#Override
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
lv.setAdapter(adapter);
// Setting adapter for the listview
if(dialog!=null)
dialog.dismiss();
for (int i = 0; i < adapter.getCount(); i++) {
HashMap<String, Object> hm = (HashMap<String, Object>) adapter
.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path", imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in
// the listview
imageLoaderTask.execute(hm);
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends
AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>> {
#Override
protected HashMap<String, Object> doInBackground(
HashMap<String, Object>... hm) {
InputStream iStream = null;
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"
+ position + ".png");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG, 100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
// Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position
// in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("image", tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position", position);
// Returning the HashMap object containing the image path and
// position
return hmBitmap;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("image");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter) lv.getAdapter();
// Getting the hashmap object at the specified position of the
// listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter
.getItem(position);
// Overwriting the existing path in the adapter
hm.put("image", path);
adapter.notifyDataSetChanged();
}
}
}}
i have a gridview in which items coming from json..,sometime my applications runs but sometime gives REJECTED EXECUTION EXECPTION at " imageLoaderTask.execute(hm);",i am unable to understand how to resolve this problem.i have tried all examples and condiotions.i have used asynchtask ,custom adapetr in my code ,but no solution and answer is ocured in my code.,how can i resolve my error.please help me...:(
First you have to understand what RejectedExecutionException means. Then decide how do you want to handle it.
AsyncTask runs its tasks in an Executor. This executor uses a queue where the tasks are stored until the executor is free to pay attention to them. The default executor with a default task can handle 10 tasks at the same time and store 10 additional tasks to perform once the running ones complete. Once the spot for all these 20 tasks (10+10) it can't take any more tasks, and it lets you know by raising a RejectedExecutionException.
How can you deal with this? Depends on what you need. You can catch that exception and try again later to see if the queue has room later, or you could use a differently configured executor that (a) can perform more tasks at the same time or (b) that has a queue with more space for tasks. Some already existing executor classes can be configured with parameters more appropriate for your needs (see the documentation for Executor) or you can write your own. One such executor is ThreadPoolExecutor that you can tell what kind of queue to use (this is the executor that is used in some of the Android versions, you don't specify which version you're working with). In the documentation there's discussion about what kinds of queues there are.
Again, the decision on how to configure the executor and queue is up to you and your needs. Such as if you want to allow for unbounded creation of threads, or have a limit. Want to have a long queue of tasks or short, or even unbound.
Try this..
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
imageLoaderTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, hm);
else
imageLoaderTask.execute(hm);
For all AsyncTask
public class NewMovie extends Activity {
GridView lv;
Vibrator vibrator;
SimpleAdapter adapter;
Button b;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Log.i("Category", MainActivity.movie_Category);
setContentView(R.layout.new_movie);
vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
lv = (GridView) findViewById(R.id.grid_view);
// URL to the JSON data
String strUrl = "http://vaibhavtech.com/work/android/movie_list.php?category="
+ MainActivity.movie_Category + "&sub_category=new";
// Creating a new non-ui thread task to download json data
DownloadTask downloadTask = new DownloadTask();
// Starting the download processt
downloadTask.execute(strUrl);
// Getting a reference to ListView of activity_main
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// // TODO Auto-generated method stub
vibrator.vibrate(40);
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.customtoast,
(ViewGroup) findViewById(R.id.custom_toast_layout));
Toast toast = new Toast(getApplicationContext());
toast.setDuration(Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 0);
toast.setView(view);
toast.show();
MainActivity.movie_Id = ((TextView) arg1
.findViewById(R.id.tv_girdview_content_id)).getText()
.toString();
Log.i("Name is", MainActivity.movie_Id);
startActivity(new Intent(NewMovie.this, MovieDescription.class));
}
});
}
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(
iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception while downloading url", e.toString());
} finally {
iStream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String> {
String data = null;
#Override
protected String doInBackground(String... url) {
try {
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
#Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends
AsyncTask<String, Void, SimpleAdapter> {
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
#Override
protected SimpleAdapter doInBackground(String... strJson) {
try {
jObject = new JSONObject(strJson[0]);
MovieParser countryJsonParser = new MovieParser();
countryJsonParser.parse(jObject);
} catch (Exception e) {
Log.d("JSON Exception1", e.toString());
}
// Instantiating json parser class
MovieParser countryJsonParser = new MovieParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> countries = null;
try {
// Getting the parsed data as a List construct
countries = countryJsonParser.parse(jObject);
} catch (Exception e) {
Log.d("Exception", e.toString());
}
// Keys used in Hashmap
String[] from = { "image", "id", "year", "duration", "name" };
// Ids of views in listview_layout
// int[] to = {
// R.id.iv_radio_data_image,R.id.tv_radio_data_id,R.id.tv_radio_data_like,R.id.tv_radio_data_rating,R.id.tv_radio_data_listner,R.id.tv_radio_data_radio_url,R.id.tv_radio_data_name};
int[] to = { R.id.iv_girdview_content_image,
R.id.tv_girdview_content_id, R.id.tv_girdview_content_like,
R.id.tv_girdview_content_listner,
R.id.tv_girdview_content_name };
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
adapter = new SimpleAdapter(getBaseContext(), countries,
R.layout.grid_view_content, from, to);
return adapter;
// lv.setAdapter(new ListAdapter(getApplicationContext()));
}
/** Invoked by the Android on "doInBackground" is executed */
#Override
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
lv.setAdapter(adapter);
for (int i = 0; i < adapter.getCount(); i++) {
HashMap<String, Object> hm = (HashMap<String, Object>) adapter
.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path", imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in
// the listview
imageLoaderTask.execute(hm);
}
// }
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask
extends
AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>> {
#Override
protected HashMap<String, Object> doInBackground(
HashMap<String, Object>... hm) {
InputStream iStream = null;
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"
+ position + ".png");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG, 100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
// Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its
// position in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("image", tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position", position);
// Returning the HashMap object containing the image path
// and position
return hmBitmap;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("image");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
adapter = (SimpleAdapter) lv.getAdapter();
// Getting the hashmap object at the specified position of the
// listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter
.getItem(position);
// Overwriting the existing path in the adapter
hm.put("image", path);
// lv.invalidateViews();
adapter.notifyDataSetChanged();
}
}
}
---------*********************-------------------------------------------
PLZ help i found this ans from loag time i want loading more image from server when scrolling like facebook app style. above my code plz help me.
Benji helped me here.
public class EndlessScrollListener implements OnScrollListener {
private int visibleThreshold = 5;
private int currentPage = 0;
private int previousTotal = 0;
private boolean loading = true;
public EndlessScrollListener() {
}
public EndlessScrollListener(int visibleThreshold) {
this.visibleThreshold = visibleThreshold;
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
currentPage++;
}
}
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
// I load the next page of gigs using a background task,
// but you can call any function here.
new LoadGigsTask().execute(currentPage + 1);
loading = true;
}
}
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
}
Check this out
Im trying to parse some items in a listview and when I scroll down I want to get more products and add them to the list.
But my code doesnt do that it either refreshes it or crashes.
Any help?
Also adding a footer doesnt work either i get an classcastexception
JSONParser:
package com.lars.json;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.lars.R.drawable;
import android.R;
import android.util.Log;
/** A class to parse json data */
public class JSONParser {
// Receives a JSONObject and returns a list
public List<HashMap<String,Object>> parse(JSONObject jObject){
JSONArray jProducts = null;
try {
// Retrieves all the elements in the 'countries' array
jProducts = jObject.getJSONArray("products");
} catch (JSONException e) {
e.printStackTrace();
}
// Invoking getCountries with the array of json object
// where each json object represent a country
return getProducts(jProducts);
}
private List<HashMap<String, Object>> getProducts(JSONArray jProducts){
int productsCount = jProducts.length();
List<HashMap<String, Object>> productList = new ArrayList<HashMap<String,Object>>();
HashMap<String, Object> product = null;
// Taking each country, parses and adds to list object
for(int i=0; i<productsCount;i++){
try {
// Call getCountry with country JSON object to parse the country
product = getJSON((JSONObject)jProducts.get(i));
productList.add(product);
} catch (JSONException e) {
e.printStackTrace();
}
}
return productList;
}
// Parsing the Country JSON object
private HashMap<String, Object> getJSON(JSONObject f){
HashMap<String, Object> country = new HashMap<String, Object>();
String id = "";
String naam = "";
String status = "";
String prijs = "";
String productnum = "";
try {
String priceone = f.getString("prijsex");
id = f.getString("id");
naam = f.getString("naam");
status = f.getString("status");
prijs = "€" + priceone;
productnum = f.getString("productnum");
country.put("id", id);
country.put("naam", naam);
country.put("img", com.lars.R.drawable.tlogotrans);
country.put("prijs", prijs);
country.put("img_path", "http://www.lars.com/images/" + productnum + ".jpg");
if(Integer.parseInt(status) > 0){
country.put("status", com.lars.R.drawable.stock);
}else{
country.put("status", com.lars.R.drawable.nostock);
}
} catch (JSONException e) {
e.printStackTrace();
}
return country;
}
}
Download tasks and Listview loaders:
/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
try{
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while( ( line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}finally{
iStream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String>{
String data = null;
#Override
protected String doInBackground(String... url) {
try{
data = downloadUrl(url[0]);
}catch(Exception e){
Log.d("Background Task",e.toString());
}
return data;
}
#Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
Log.i("Result", result);
if(result.equals(" ")){
Log.i("No img", "No Img");
}else{
listViewLoaderTask.execute(result);
}
// Start parsing xml data
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter>{
JSONObject jObject;
private List<HashMap<String, Object>> products;
// Doing the parsing of xml data in a non-ui thread
#Override
protected SimpleAdapter doInBackground(String... strJson) {
try{
jObject = new JSONObject(strJson[0]);
JSONParser jsonpars = new JSONParser();
jsonpars.parse(jObject);
}catch(Exception e){
Log.d("JSON Exception1",e.toString());
}
// Instantiating json parser class
JSONParser jsonpars = new JSONParser();
// A list object to store the parsed countries list
try{
// Getting the parsed data as a List construct
if(set == 0){
products = jsonpars.parse(jObject);
}else{
products.addAll(jsonpars.parse(jObject));
}
}catch(Exception e){
Log.d("Exception",e.toString());
}
// Keys used in Hashmap
String[] from = { "img","naam","status","prijs"};
// Ids of views in listview_layout
int[] to = { R.id.imPThumb,R.id.tvPRName,R.id.imstock,R.id.tvPRPrijs};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), products, R.layout.productlijstrow, from, to);
return adapter;
}
#Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
publishProgress();
Log.i("ListView Loader Task", "Update");
super.onProgressUpdate(values);
}
/** Invoked by the Android on "doInBackground" is executed */
#SuppressWarnings("unchecked")
#Override
protected void onPostExecute(SimpleAdapter adapter) {
// View v = getLayoutInflater().inflate(R.layout.footerview, null);
//list.addFooterView(v);
// Setting adapter for the listview
list.setAdapter(adapter);
if(set == 0){
list.setOnScrollListener(onAnswersScrolled);
set++;
}
list.setOnItemClickListener(onAnswerClicked);
list.setTextFilterEnabled(true);
/* list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
#SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Bundle extra = new Bundle();
Intent i = new Intent("com.lars.productdescription");
extra.putString("id", o.get("id"));
i.putExtras(extra);
startActivity(i);
}
});*/
for(int i=0;i<adapter.getCount();i++){
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get("img_path");
Log.i("imgurlonPost", imgUrl);
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hmDownload.put("img_path",imgUrl);
hmDownload.put("position", i);
// Starting ImageLoaderTask to download and populate image in the listview
imageLoaderTask.execute(hmDownload);
adapter.notifyDataSetChanged();
}
/* list.setOnScrollListener(new OnScrollListener(){
});*/
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>>{
#Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream=null;
String imgUrl = (String) hm[0].get("img_path");
int position = (Integer) hm[0].get("position");
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
Log.i("imgUrl", imgUrl);
// Connecting to url
urlConnection.connect();
// Log.i("Response", urlConnection.getResponseMessage());
// Reading data from url
if(urlConnection.getResponseMessage().contains("OK")){
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
cacheDirectory.delete();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+position+".png");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position in the listview
// Storing the path to the temporary image file
hmBitmap.put("img",tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position",position);
// Returning the HashMap object containing the image path and position
return hmBitmap;
}else{
Log.i("nope", "nb");
String uriStr = "android.resource://" + "com.lars" + "/" + R.drawable.ic_launcher;
hmBitmap.put("img", uriStr);
hmBitmap.put("position",position);
return hmBitmap;
}
}catch (Exception e) {
e.printStackTrace();
}
return null;
}
#SuppressWarnings("unchecked")
#Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("img");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
adapter = (SimpleAdapter ) list.getAdapter();
// Getting the hashmap object at the specified position of the listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(position);
// Overwriting the existing path in the adapter
hm.put("img",path);
// Noticing listview about the dataset changes
adapter.notifyDataSetChanged();
}
#Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
publishProgress();
adapter.notifyDataSetChanged();
Log.i("Image Task", "Update");
super.onProgressUpdate(values);
}
}
private OnItemClickListener onAnswerClicked = new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
#SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) parent.getItemAtPosition(position);
Bundle extra = new Bundle();
Intent i = new Intent("com.lars.productdescription");
extra.putString("id", o.get("id"));
i.putExtras(extra);
startActivity(i);
}
};
private OnScrollListener onAnswersScrolled = new OnScrollListener() {
public void onScroll(AbsListView view, int first, int visibleitems, int totalitemcount) {
// TODO Auto-generated method stub
int lastInScreen = first + visibleitems;
if(lastInScreen == totalitemcount){
if(kf == 0){
Log.i("onScroll", "" + c);
Log.i("kf", "0");
String filfinal = keuze.replace(" ", "thisisaspace");
String strUrl = "http://www.lars.nl/getName.php?name=" + filfinal + "&page=" + c ;
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(strUrl);
c = c + o;
Log.i("After Scroll", "" + c);
}else{
Log.i("onScroll", "" + c);
Log.i("kf", "1");
String strUrl = "http://www.lars.nl/get.php?id=" + filter + "&page=" + c ;
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(strUrl);
c = c + o;
Log.i("After Scroll", "" + c);
}
}
}
public void onScrollStateChanged(AbsListView view, int scrollstate) {
// TODO Auto-generated method stub
}
};
}
I'd like to introduce you to CWAC-ENDLESS by non other than the brilliant mark murphy (commonsware). Not only is it a fine example of the power of putting an adapter inside another adapter, it handles all the background tasks for you as well as scrolling so that your data list may be added to very easily by following the demo
I sincerely hope this helps you as much as its helped me.