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Asked: 2026-05-30T19:20:14+00:00

Well I wanted to make an AppWidget, I define the layouts,info for app widget,

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Well I wanted to make an AppWidget, I define the layouts,info for app widget, a broadcast receiver and a service to handle AppWidget.

            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this
            .getApplicationContext());
    int[] allWidgetIds = intent
            .getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);

    ComponentName thisWidget = new ComponentName(getApplicationContext(),
            SmsSchedulerWidget.class);

    RemoteViews remoteViews = new RemoteViews(this.getApplicationContext()
            .getPackageName(), R.layout.schdulesms_appwidget_layout);

    DatabaseManager dbManager = new DatabaseManager(context.getApplicationContext());
    dbManager.open();
    String contactNumber = dbManager.fetchContactNumber();
    String date = dbManager.fetchDate();
    String message = dbManager.fetchMessage();
    String status = dbManager.fetchStatus();

    remoteViews.setTextViewText(R.id.to_appwidget_saved_data, contactNumber);
    remoteViews.setTextViewText(R.id.date_appwidget_saved_data, date);
    remoteViews.setTextViewText(R.id.status_appwidget_saved, message);
    remoteViews.setTextViewText(R.id.message_appwidgset_saved_data, status);

    appWidgetManager.updateAppWidget(thisWidget, remoteViews);

This is my code………….

But in other activities i can easily retrieve database values without any null pointer exception. Please if anybody could point out whats wrong with my code than i will be higly grateful…………….

The log cat errors are:

03-02 17:26:32.174: E/AndroidRuntime(32265): FATAL EXCEPTION: main
03-02 17:26:32.174: E/AndroidRuntime(32265): java.lang.RuntimeException: Unable to start service com.android.braindigit.schedulesms.appWidgetService@4053da30 with Intent { cmp=com.android.braindigit.schedulesms/.appWidgetService (has extras) }: java.lang.NullPointerException
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2052)
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.app.ActivityThread.access$2800(ActivityThread.java:117)
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:994)
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.os.Handler.dispatchMessage(Handler.java:99)
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.os.Looper.loop(Looper.java:130)
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.app.ActivityThread.main(ActivityThread.java:3683)
03-02 17:26:32.174: E/AndroidRuntime(32265): at java.lang.reflect.Method.invokeNative(Native Method)
03-02 17:26:32.174: E/AndroidRuntime(32265): at java.lang.reflect.Method.invoke(Method.java:507)
03-02 17:26:32.174: E/AndroidRuntime(32265): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-02 17:26:32.174: E/AndroidRuntime(32265): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-02 17:26:32.174: E/AndroidRuntime(32265): at dalvik.system.NativeStart.main(Native Method)
03-02 17:26:32.174: E/AndroidRuntime(32265): Caused by: java.lang.NullPointerException
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
03-02 17:26:32.174: E/AndroidRuntime(32265): at com.android.braindigit.schedulesms.DatabaseManager.open(DatabaseManager.java:36)
03-02 17:26:32.174: E/AndroidRuntime(32265): at com.android.braindigit.schedulesms.appWidgetService.onStart(appWidgetService.java:41)
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.app.Service.onStartCommand(Service.java:428)
03-02 17:26:32.174: E/AndroidRuntime(32265): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2039)
03-02 17:26:32.174: E/AndroidRuntime(32265): … 10 more

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1 Answer

  1. Editorial Team

    Well I dont know how genuine it is to answer my own question but i thought it would help other people if they have the same problem as me…..So, after banging my head for hours, finally i realised that i was passing a null context.So, i did the following things and it worked….

    from the broadcase receiver I passed the following intents to my service:

        Intent intent = new Intent(context.getApplicationContext(),appWidgetService.class);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS,allWidgetIds);
    intent.putExtra("contactNumber", contactNumber);
    intent.putExtra("date", date);
    intent.putExtra("message",message);
    intent.putExtra("status", status);
    //update the widgets via the service

    and in service i did the following things:

        String contactNumber = intent.getStringExtra("contactNumber");
    String date = intent.getStringExtra("date");
    String message =intent.getStringExtra("message");
    String status = intent.getStringExtra("status");


    for (int widgetId : allWidgetIds) {
        RemoteViews remoteViews = new RemoteViews(this
                .getApplicationContext().getPackageName(),
                R.layout.schdulesms_appwidget_layout);



        remoteViews.setTextViewText(R.id.to_appwidget_saved_data,
                contactNumber);
        remoteViews.setTextViewText(R.id.date_appwidget_saved_data, date);
        remoteViews.setTextViewText(R.id.status_appwidget_saved, message);
        remoteViews.setTextViewText(R.id.message_appwidgset_saved_data,
                status);

        appWidgetManager.updateAppWidget(thisWidget, remoteViews);
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