Prefs: limit callsign entry to 6; fix #163

res/layout/new_message_view.xml

@@ -17,6 +17,7 @@
 			android:singleLine="true"
 			android:inputType="textCapCharacters"
 			android:digits="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-"
+			android:maxLength="9"
 			android:hint="@string/p_callsign"
 			/>
 		<EditText

res/xml/preferences.xml

@@ -9,6 +9,7 @@
                 android:key="callsign"
 		android:inputType="textCapCharacters"
 		android:digits="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+		android:maxLength="6"
 		android:title="@string/p_callsign_nossid"
 		android:summary="@string/p_callsign_summary"
 		android:hint="@string/p_callsign_nossid"

src/PrefsWrapper.scala

@@ -23,7 +23,7 @@ class PrefsWrapper(val context : Context) {
 	}
 
 	// return commonly used prefs
-	def getCallsign() = prefs.getString("callsign", "").trim().toUpperCase()
+	def getCallsign() = prefs.getString("callsign", "").trim().slice(0, 6).toUpperCase()
 
 	def getPasscode() = prefs.getString("passcode", "") match {
 		case "" => "-1"