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public class RestaurantList extends Activity{
// declare view objects
ImageButton imgNavBack, imgRefresh;
ListView listRestaurant;
ProgressBar prgLoading;
TextView txtAlert;
// declare adapter object to create custom restaurant list
RestaurantListAdapter rla;
// create arraylist variables to store data from server
static ArrayList<Long> Restaurant_ID = new ArrayList<Long>();
static ArrayList<String> Restaurant_nom = new ArrayList<String>();
static ArrayList<String> Restaurant_image = new ArrayList<String>();
String RestaurantAPI;
int IOConnect = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.restaurant_list);
// connect view objects and xml id
imgNavBack = (ImageButton) findViewById(R.id.imgNavBack);
prgLoading = (ProgressBar) findViewById(R.id.prgLoading);
listRestaurant = (ListView) findViewById(R.id.listRestaurant);
txtAlert = (TextView) findViewById(R.id.txtAlert);
imgRefresh = (ImageButton) findViewById(R.id.imgRefresh);
rla = new RestaurantListAdapter(RestaurantList.this);
// category API url
RestaurantAPI = Utils.RestaurantAPI+"?accesskey="+Utils.AccessKey;
// call asynctask class to request data from server
new getDataTask().execute();
// event listener to handle list when clicked
listRestaurant.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// TODO Auto-generated method stub
// go to menu page
Intent iMenuList = new Intent(RestaurantList.this, MenuList.class);
iMenuList.putExtra("restaurant_id", Restaurant_ID.get(position));
iMenuList.putExtra("restaurant_name", Restaurant_nom.get(position));
startActivity(iMenuList);
}
});
// event listener to handle refresh button when clicked
imgRefresh.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
// re-request data from server by calling asynctask class
IOConnect = 0;
listRestaurant.invalidateViews();
clearData();
new getDataTask().execute();
}
});
// event listener to handle back button when clicked
imgNavBack.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
// go back to previous page
finish();
}
});
}
// clear arraylist variables before used
void clearData(){
Restaurant_ID.clear();
Restaurant_nom.clear();
Restaurant_image.clear();
}
// asynctask class to handle parsing json in background
public class getDataTask extends AsyncTask<Void, Void, Void>{
// show progressbar first
getDataTask(){
if(!prgLoading.isShown()){
prgLoading.setVisibility(0);
txtAlert.setVisibility(8);
}
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
// parse json data from server in background
parseJSONData();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
// when finish parsing, hide progressbar
prgLoading.setVisibility(8);
// if internet connection and data available show data on list
// otherwise, show alert text
if((Restaurant_ID.size() > 0) && (IOConnect == 0)){
listRestaurant.setVisibility(0);
listRestaurant.setAdapter(rla);
}else{
txtAlert.setVisibility(0);
}
}
}
// method to parse json data from server
public void parseJSONData(){
clearData();
try {
// request data from Category API
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 15000);
HttpConnectionParams.setSoTimeout(client.getParams(), 15000);
HttpUriRequest request = new HttpGet(RestaurantAPI);
HttpResponse response = client.execute(request);
InputStream atomInputStream = response.getEntity().getContent();
BufferedReader in = new BufferedReader(new InputStreamReader(atomInputStream));
String line;
String str = "";
while ((line = in.readLine()) != null){
str += line;
}
// parse json data and store into arraylist variables
JSONObject json = new JSONObject(str);
JSONArray data = json.getJSONArray("data");
for (int i = 0; i < data.length(); i++) {
JSONObject object = data.getJSONObject(i);
JSONObject restaurant = object.getJSONObject("Restaurant");
Restaurant_ID.add(Long.parseLong(restaurant.getString("Restaurant_ID")));
Restaurant_nom.add(restaurant.getString("Restaurant_nom"));
Restaurant_image.add(restaurant.getString("Restaurant_image"));
Log.d("Restaurant nom", Restaurant_nom.get(i));
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
IOConnect = 1;
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
rla.imageLoader.clearCache();
listRestaurant.setAdapter(null);
super.onDestroy();
}
@Override
public void onConfigurationChanged(final Configuration newConfig)
{
// Ignore orientation change to keep activity from restarting
super.onConfigurationChanged(newConfig);
}
} |
Recuperation des données JSON
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