Question

Is there a way to write in the standard calendar from the smartphone from my gwt application.

Which that I can make a new entry in the calendar from the gwt application.

Answer 1

If you have a native application that you GWT application is running inside, then the easiest way would be to expose a native class to GWT via javascript injection.

For example with Android, your GWT application would run inside a WebView with a Browser instance. This browser can provide methods to you GWT application like this:

myWebView = (WebView) findViewById(R.id.web_view);
myWebView.getSettings().setJavaScriptEnabled(true);
myWebView.addJavascriptInterface(new GwtJavaJSImpl(), "injected");

The methods in GwtJavaJSImpl would then be accessible from GWT by calling the JavaScript method injected.methodXxx() like this:

public native void callInjectedMethodXxx() /*-{
    $injected.methodXxx()
}-*/;

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If you don’t have a native application on your smartphone, you could generate a calendar file (e.g. event.ics) which you then could let the smartphone download. That file would then be automatically added to the device’s calendar.