I am having some trouble with implementing my own observer in Java on
the Android platform.
I have created a class call NetworkPathJni that uses an Observer
interface class called NetworkPathJniObserver to notify other objects
of changes.
Here is the code for NetworkPathJni.java
---
public class NetworkPathJni {
NetworkPathJniObserver networkPathJniObserver;
public NetworkPathJni(NetworkPathJniObserver aObserver){
networkPathJniObserver = aObserver;
Log.d("Phone", "NetworkPathJni Created" );
}
public void NetworkPathStateChanged(int aAvailabilityState){
Log.d("Phone", "NetworkPathStateChanged new state = " +
aAvailabilityState );
TAvailabilityState availabilityState =
intToAvailability(aAvailabilityState);
Log.d("Phone", "Is SipNetworkPath alive?" +
networkPathJniObserver.isAlive());
networkPathJniObserver.NetworkPathStateChanged(availabilityState);
Log.d("Phone", "NetworkPathStateChanged end" );
Log.d("Phone", "Is SipNetworkPath alive? (2)" +
networkPathJniObserver.isAlive());
}
---
And here is the code for the observer
---
public interface NetworkPathJniObserver {
void NetworkPathStateChanged(TAvailabilityState aAvailabilityState);
boolean isAlive();
}
---
The observer is implemented as follows in a class called
SipNetworkPath
---
public class SipNetworkPath implements NetworkPathInterface,
NetworkPathJniObserver{
NetworkPathObserverInterface observer;
NetworkPathJni networkPathJni;
public SipNetworkPath(NetworkPathObserverInterface aObserver){
domainType = aDomainType;
observer = aObserver;
networkPathJni = new NetworkPathJni(this);
Log.d("Phone", "SipNetworkPath created" );
}
//NetworkPathJniObserver
@Override
public void NetworkPathStateChanged(TAvailabilityState
availabilityState) {
Log.d("SipNetworkPath", "SipNetworkPath - Do networkpathstate
changed!");
}
@Override
public boolean isAlive() {
return true;
}
---
And SipNetworkPath is instanciated as follows
---
public class WifiNetworkPath extends SipNetworkPath{
public WifiNetworkPath(NetworkPathObserverInterface aObserver) {
super(aObserver);
}
---
The logging shows that both NetworkPathJni and SipNetworkPath get
created and that NetworkPathStateChanged(int aAvailabilityState) is
called.
Within that method all the logging comes back but the method does not
get called in the observer and I get false when I ask "Is
SipNetworkPath alive?" in the logging.
Is the observer class losing reference or something or is there a
mistake in my way of doing this? Does Android kill off objects that
are not part of an Activity or a Service instantly or something along
thoese lines that might be causing the problem?
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