gistfile1.java

private void log(String qrCode) {
	Intent intent = new Intent("ch.appquest.intent.LOG");

	if (getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY).isEmpty()) {
		Toast.makeText(this, "Logbook App not Installed", Toast.LENGTH_LONG).show();
		return;
	}

	// Achtung, je nach App wird etwas anderes eingetragen
	String logmessage = ...
	intent.putExtra("ch.appquest.logmessage", logmessage);

	startActivity(intent);
}