Разработка виджета для отображения курса bitcoin

/**  * Implementation of App Widget functionality.  */ public class BTCWidget extends AppWidgetProvider {        static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,                                 int appWidgetId) {          CharSequence widgetText = context.getString(R.string.appwidget_text);         // Construct the RemoteViews object         RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.btcwidget);         views.setTextViewText(R.id.appwidget_text, widgetText);          // Instruct the widget manager to update the widget         appWidgetManager.updateAppWidget(appWidgetId, views);     }      @Override     public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {         // There may be multiple widgets active, so update all of them         for (int appWidgetId : appWidgetIds) {             updateAppWidget(context, appWidgetManager, appWidgetId);         }     }      @Override     public void onEnabled(Context context) {         // Enter relevant functionality for when the first widget is created     }      @Override     public void onDisabled(Context context) {         // Enter relevant functionality for when the last widget is disabled     } }

 /**  * Implementation of App Widget functionality.  */ public class BTCwidget extends AppWidgetProvider {      private static final String SYNC_CLICKED    = "btcwidget_update_action";     private static final String WAITING_MESSAGE = "Wait for BTC price";     public static final int httpsDelayMs = 300;      //этот метод выполняется, когда пора обновлять виджет     static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,                                 int appWidgetId)  {          //Объект RemoteViews дает нам доступ к отображаемым в виджете элементам:         RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.btcwidget);         //в данном случае - к TextView         views.setTextViewText(R.id.appwidget_text, WAITING_MESSAGE);         appWidgetManager.updateAppWidget(appWidgetId, views);          String output;         //запускаем отдельный поток для получения данных с сайта биржи         //в основном потоке делать запрос нельзя - выбросит исключение         HTTPRequestThread thread = new HTTPRequestThread();         thread.start();         try {             while (true) {                 Thread.sleep(300);                 if(!thread.isAlive()) {                     output = thread.getInfoString();                     break;                 }             }          } catch (Exception e) {             output = e.toString();         }        //выводим в виджет результат         views.setTextViewText(R.id.appwidget_text, output);          // Instruct the widget manager to update the widget         appWidgetManager.updateAppWidget(appWidgetId, views);     }      @Override     public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {          RemoteViews remoteViews;         ComponentName watchWidget;          remoteViews = new RemoteViews(context.getPackageName(), R.layout.btcwidget);         watchWidget = new ComponentName(context, BTCwidget.class);          //при клике на виджет в систему отсылается вот такой интент, описание метода ниже         remoteViews.setOnClickPendingIntent(R.id.appwidget_text,   getPendingSelfIntent(context, SYNC_CLICKED));         appWidgetManager.updateAppWidget(watchWidget, remoteViews);          //обновление всех экземпляров виджета          for (int appWidgetId : appWidgetIds) {             updateAppWidget(context, appWidgetManager, appWidgetId);         }      }     //этот метод ловит интенты, срабатывает когда интент создан нажатием на виджет и   //запускает обновление виджета     @Override     public void onReceive(Context context, Intent intent) {          super.onReceive(context, intent);          if (SYNC_CLICKED.equals(intent.getAction())) {              AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);              RemoteViews remoteViews;             ComponentName watchWidget;              remoteViews = new RemoteViews(context.getPackageName(), R.layout.btcwidget);             watchWidget = new ComponentName(context, BTCwidget.class);              remoteViews.setTextViewText(R.id.appwidget_text, WAITING_MESSAGE);              //updating widget             appWidgetManager.updateAppWidget(watchWidget, remoteViews);              String output;             HTTPRequestThread thread = new HTTPRequestThread();             thread.start();             try {                 while (true) {                     Thread.sleep(httpsDelayMs);                     if(!thread.isAlive()) {                         output = thread.getInfoString();                         break;                     }                 }              } catch (Exception e) {                 output = e.toString();             }              remoteViews.setTextViewText(R.id.appwidget_text, output);              //widget manager to update the widget             appWidgetManager.updateAppWidget(watchWidget, remoteViews);          }     }         //создание интента     protected PendingIntent getPendingSelfIntent(Context context, String action) {         Intent intent = new Intent(context, getClass());         intent.setAction(action);         return PendingIntent.getBroadcast(context, 0, intent, 0);     } } 

package com.hakey.btcwidget;  import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.Calendar;  class HTTPRequestThread extends Thread{     private static final String urlString = "https://btc-e.nz/api/3/ticker/btc_usd";      String getInfoString() {         return output;     }      private String output = "";      private void requestPrice() {          try {             URL url = new URL(urlString);             HttpURLConnection con = (HttpURLConnection) url.openConnection();             con.setRequestMethod("GET");             BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));             String inputLine;             StringBuilder response = new StringBuilder();              while ((inputLine = in.readLine()) != null) {                 response.append(inputLine);             }             in.close();              output = "Price: " + JSONParser.getPrice(response.toString())                     + "\n" + getTimeStamp();          } catch (Exception e) {             output = e.toString();         }     }      @Override     public void run() {         requestPrice();     }      private String getTimeStamp() {         Calendar calendar = Calendar.getInstance();         if(calendar.get(Calendar.MINUTE)>9) {              return "Time: " + calendar.get(Calendar.HOUR_OF_DAY)                     + ":" + calendar.get(Calendar.MINUTE);         } else {             return "Time: " + calendar.get(Calendar.HOUR_OF_DAY)                     + ":0" + calendar.get(Calendar.MINUTE);         }      } } 

 package com.hakey.btcwidget;  import org.json.JSONException; import org.json.JSONObject;  class JSONParser {      static String getPrice(String s) throws JSONException {         String price;         JSONObject obj = new JSONObject(s);         JSONObject pairObj = obj.getJSONObject("btc_usd");         price = pairObj.getString("last");          return price;     } }