Start activity by clicking on widget

Use this snippet in onUpdate() method of your widget AppWidgetProvider class:

@Overridepublic void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {    RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widgetlayout);    Intent configIntent = new Intent(context, Activity.class);    PendingIntent configPendingIntent = PendingIntent.getActivity(context, 0, configIntent, 0);    remoteViews.setOnClickPendingIntent(R.id.widget, configPendingIntent);    appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);}     

Here widgetlayout is name of your widget layout and R.id.widget is it's parent layout id.

Edit:
Now,I see your code that you added to your question.You would to do:

PendingIntent.getActivity(context, 0, configIntent, 0);

(that start's activity) instead of

PendingIntent.getService(...);

that attempt to starts service.Good luck.

References:
doityourselfandroid.com

helloandroid.com

Intent inet = new Intent(your_action);inet.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);PendingIntent pIntentNetworkInfo = PendingIntent.getActivity(context, 2,             inet, Intent.FLAG_ACTIVITY_NEW_TASK);remoteViews.setOnClickPendingIntent(you_component_when_the_user_pressing_this_activity_should_start, pIntentNetworkInfo);

I don't know about "Creating widget from another widget". This is out of my knowledge but I suggest you to build your own widget.

Apart from that, calling activity from widget should be using PendingIntent

Here is simple example to do it

Intent iSetting = new Intent(this, MyConfig.class);PendingIntent piSetting = PendingIntent.getActivity(this, 0, iSetting, 0);views.setOnClickPendingIntent(R.id.IdComponent, piSetting);

Or you might need to see this link and this link