I am using the Observer pattern in my Android application to notify a
running service that some data has changed:
Here is the code outside the Service: (WifiConnectionManager)
---
//Observables
@Override
public void NotifyQCLevelChange(QCLevel newQoSLevel) {
setChanged();
notifyObservers( newQoSLevel );
}
@Override
public void NotifyQCPercentageChange(int percentage) {
setChanged();
notifyObservers( percentage );
}
---
Where the observables get updated within an Observer update method:
(WifiConnectionManager)
---
@Override
public void update(Observable arg0, Object arg) {
if( !iActive )
return;
if( arg0 instanceof WifiMonitor ){
Log.d("WifiConnectionManager", "update from WiFiMonitor
ss=:" +
arg.toString());
if( iConnectionState.equals(ConnectionState.IPACTIVE) )
{
int qcPercentage =
Integer.parseInt(arg.toString());
Log.d("GetActiveQCLevel", "GetActiveQCLevel
called");
QCLevel aConnectionQCLevel =
GetActiveQCLevel(qcPercentage);
if(
!aConnectionQCLevel.equals(iConnectionQCLevel) )
{
iConnectionQCLevel = aConnectionQCLevel;
NotifyQCLevelChange(iConnectionQCLevel);
Log.d("NotifyQCLevelChange",
"NotifyQCLevelChange");
}
NotifyQCPercentageChange(qcPercentage);
Log.d("NotifyQCPercentageChange",
"NotifyQCPercentageChange");
}
}
---
And finally the Observer in my service: (WifiService)
---
@Override
public void update(Observable observable, Object data) {
if( observable instanceof WifiConnectionManager && data
instanceof
QCLevel){
Log.d("WifiConnectionManager", "instanceof QCLevel");
}
else if( observable instanceof WifiConnectionManager && data
instanceof Integer){
Log.d("WifiConnectionManager", "instanceof Integer");
}
else if( observable instanceof WifiConnectionManager){
Log.d("WifiConnectionManager", "instanceof
WifiConnectionManager");
}
---
>From the log I can see that Log.d("GetActiveQCLevel",
"GetActiveQCLevel called"); &&
Log.d("NotifyQCPercentageChange", "NotifyQCPercentageChange"); get
called but nothing in the update method of the Observer in my service
(WifiService) gets called.
Can anyone see where the problem is or is there a restriction I am not
aware of?
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