Why do I get an InstantiationException if I try to start a service? [duplicate]

Question

Possible Duplicate:
Android RuntimeException: Unable to instantiate the service

I have been trying to fix the following problem all day but nothing seems to work.

I have a widget which gets it's views updated via an IntentService. But i keep getting an InstantiationException when trying to start this service. Below is the stack trace of the error and the code i use to launch the service. I don't believe i need to post the code of the service as it is never even started, but if someone thinks otherwise i will of course do so.

STACKTRACE

05-30 13:58:47.150: ERROR/AndroidRuntime(1163): FATAL EXCEPTION: main 05-30 13:58:47.150: ERROR/AndroidRuntime(1163): java.lang.RuntimeException: Unable to instantiate service syrligt.cashtrack.widgets.StatisticsWidgetUpdateService: java.lang.InstantiationException: syrligt.cashtrack.widgets.StatisticsWidgetUpdateService 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:1904) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at android.app.ActivityThread.access$2500(ActivityThread.java:117) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:982) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at android.os.Handler.dispatchMessage(Handler.java:99) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at android.os.Looper.loop(Looper.java:123) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at android.app.ActivityThread.main(ActivityThread.java:3647) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at java.lang.reflect.Method.invokeNative(Native Method) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at java.lang.reflect.Method.invoke(Method.java:507) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at dalvik.system.NativeStart.main(Native Method) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163): Caused by: java.lang.InstantiationException: syrligt.cashtrack.widgets.StatisticsWidgetUpdateService 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at java.lang.Class.newInstanceImpl(Native Method) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at java.lang.Class.newInstance(Class.java:1409) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:1901) 05-30 13:58:47.150: ERROR/AndroidRuntime(1163):     ... 10 more 

WIDGET CODE

 public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {      for(int i = 0; i<appWidgetIds.length ; i++){          Intent intent = new Intent(context,StatisticsWidgetUpdateService.class);          intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[i]);          context.startService(intent);      }  } 

SERVICE CODE

public class StatisticsWidgetUpdateService extends IntentService {  public StatisticsWidgetUpdateService(String name) {     super(name); }  @Override protected void onHandleIntent(Intent intent) {     AppWidgetManager appWidgetManager=AppWidgetManager.getInstance(this);     int appWidgetId = intent.getExtras().getInt(AppWidgetManager.EXTRA_APPWIDGET_ID);     CashDB cdb = new CashDB(this);     cdb.open();      RemoteViews updatedViews = new RemoteViews(getPackageName(), R.layout.statistics_widget);     updatedViews.removeAllViews(R.id.list);     PendingIntent pendingIntent = null;     Cursor c = null;     Intent i = null;     SharedPreferences sp = getSharedPreferences(Preferences.PREFERENCES, 0);      double incomeAmount = cdb.sumTransactions(null, new TimeFrame(sp.getInt(Preferences.DEFAULT_TIME_FRAME, TimeFrame.ALL_TIME)), 1);     double expenseAmount = Math.abs(cdb.sumTransactions(null, new TimeFrame(sp.getInt(Preferences.DEFAULT_TIME_FRAME, TimeFrame.ALL_TIME)), -1));      int value = StatisticsWidgetConfig.getConfig(this, appWidgetId);     c = cdb.fetchCategoriesWithSums(new TimeFrame(sp.getInt(Preferences.DEFAULT_TIME_FRAME, TimeFrame.ALL_TIME)), value, 3);      updatedViews.setTextViewText(R.id.balance, StringConversion.formatAmount(incomeAmount - expenseAmount));//balance text     updatedViews.setViewVisibility(R.id.value_bar, incomeAmount - expenseAmount < 0 ? R.drawable.list_item_value_red_medium : R.drawable.list_item_value_green_medium);//value bar     updatedViews.setTextViewText(R.id.income, StringConversion.formatAmount(incomeAmount));//income text     updatedViews.setTextViewText(R.id.expense, StringConversion.formatAmount(expenseAmount));//expense text     updatedViews.setTextViewText(R.id.popularity, Integer.toString(cdb.fetchAllTransactions(new TimeFrame(sp.getInt(Preferences.DEFAULT_TIME_FRAME, TimeFrame.ALL_TIME)), null, null,null).getCount()));//popularity text      for(int j = 0; j<c.getCount();j++){          c.moveToPosition(j);         RemoteViews statisticsView = new RemoteViews(getPackageName(), R.layout.statistics_widget_list);          statisticsView.setTextViewText(R.id.name, c.getString(c.getColumnIndexOrThrow(CashDB.CATEGORY_NAME)));//category name         statisticsView.setImageViewResource(R.id.icon, c.getInt(c.getColumnIndexOrThrow(CashDB.CATEGORY_IMAGE)));//category icon         statisticsView.setViewVisibility(R.id.starred, c.getInt(c.getColumnIndexOrThrow(CashDB.CATEGORY_STARRED)) == 1 ? View.VISIBLE : View.GONE);//starred icon          double procent = c.getLong(c.getColumnIndexOrThrow(CashDB.TRANSACTION_SUM));         procent = procent/(value == -1 ? expenseAmount : incomeAmount);         procent = Math.abs(procent * 100);          if((procent%1) < 0.1){              statisticsView.setTextViewText( R.id.procent, String.format("%.0f%s",procent," %"));//procentage         }else{              statisticsView.setTextViewText( R.id.procent, String.format("%.1f%s",procent," %"));//procentage         }          Bitmap bmp;         if(value == -1){             bmp=BitmapFactory.decodeResource(getResources(), R.drawable.progress_bar_red);         }else{             bmp=BitmapFactory.decodeResource(getResources(), R.drawable.progress_bar_green);         }         int width=(int) (procent*4.056);  // kankse fuckar upp på andra display storlekar         if(width<2){             width=2;         }         width = (int) getResources().getDisplayMetrics().density * width;         int height=10;         Bitmap resizedbitmap=Bitmap.createScaledBitmap(bmp, width, height, true);         statisticsView.setImageViewBitmap(R.id.progress_bar, resizedbitmap);//procent bar          i = new Intent(this, ViewCategory.class);         i.putExtra(CashDB.CATEGORY_ID, c.getLong(c.getColumnIndexOrThrow(CashDB.CATEGORY_ID)));         i.setAction("cashtrackViewCategory"+c.getLong(c.getColumnIndexOrThrow(CashDB.CATEGORY_ID)));         pendingIntent = PendingIntent.getActivity(this, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);         statisticsView.setOnClickPendingIntent(R.id.statistics_widget_list_layout, pendingIntent);         updatedViews.addView(R.id.list, statisticsView);      }      c.close();     cdb.close();     appWidgetManager.updateAppWidget(appWidgetId, updatedViews); } 

}

Answer 1

You service needs to have a public no-args constructor. Otherwize, Android will not be able to instantiate it.

So replace

public StatisticsWidgetUpdateService(String name) {     super(name); } 

with

public StatisticsWidgetUpdateService() {     super("SOME NAME"); }