Pourquoi ai-je une exception InstantiationException si je tente de démarrer un service?

Question

Double Possible:
Android RuntimeException: Impossible d'instancier le service

J'ai essayé de résoudre le problème suivant tous les jours, mais rien ne semble fonctionner.

J'ai un widget qui obtient des vues de mise à jour via une IntentService. Mais je reçois un InstantiationException lorsque vous essayez de démarrer ce service. Ci-dessous est la trace de la pile de l'erreur et le code que j'utilise pour lancer le service. Je ne crois pas que j'ai besoin de mettre le code du service tel qu'il est n'a même jamais commencé, mais si quelqu'un pense le contraire, je vais le faire.

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

CODE DU WIDGET

 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);
     }
 }

LE CODE DE SERVICE

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

Votre service doit avoir un constructeur public sans argument. Sinon, Android ne pourra pas l'instancier.

Alors remplacez

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

avec

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

Answer 2

Avez-vous déclaré le nom du service dans AndroidManifest.xml?

 <service android:name="YOUR_SERVICE_NAME" />