ビットコインの為替レートを表示するAndroidウィジェットの開発

 /** * 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; //  ,     static void updateAppWidget(Context context, AppWidgetManager appWidgetManager, int appWidgetId) { // RemoteViews        : RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.btcwidget); //   -  TextView views.setTextViewText(R.id.appwidget_text, WAITING_MESSAGE); appWidgetManager.updateAppWidget(appWidgetId, views); String output; //         //      -   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(); } //    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); //         ,    remoteViews.setOnClickPendingIntent(R.id.appwidget_text, getPendingSelfIntent(context, SYNC_CLICKED)); appWidgetManager.updateAppWidget(watchWidget, remoteViews); //    for (int appWidgetId : appWidgetIds) { updateAppWidget(context, appWidgetManager, appWidgetId); } } //   ,         //   @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); } } //  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; } }