Re: [android-developers] pass parameters between threads
I came to the same conclusion as droidDev due to this:
IteratorMapString, String iterator = response.iterator();
If 'response' isnt a class variable, that would not compile. Also, in his
second comment he pretty much confirmed that was the case. I dont think he
meant to say that by omitting the local deceleration it became a member
variable, rather that because he made the second deceleration, it became
local (which he didnt know would happen, since he needs some studying on
Scopes :-P )
On Wednesday, January 23, 2013 6:26:00 PM UTC-8, Lew wrote:
droidDev wrote:
You forgot to attribute the quote there, sport.
Lew said:
.. What you said there doesn't make sense. A variable has to be
explicitly declared as a class or instance member; it doesn't just
magically appear when you remove a local variable.
I think what John was describing does make sense. He had inadvertently
created a new response var in an inner scope, thereby effectively masking
out his pre-existing instance var of the same name; therefore the response
data was being discarded each time the inner scope was exited.
How do you know that? His code showed nothing like that. There was no
instance variable,
or even class definition shown. He referred to a 'type declaration
MapString, String' but
nothing was shown declared to be that type. The only place that appeared
was in a generic
type argument, but removing that would not un-shadow (mask is not a Java
term) an instance
variable.
Evidence?
John Merlino wrote:
I have a thread to make a web service request. And then I get the data
and store it in response variable. Now I need to add items to the map
on the main thread, but how do i get the response data back in the
main thread. Here is what I have:
private void processHistory(final String authkey, final String unitId)
{
new Thread(){
public void run(){
ListMapString, String response =
WebService.getHistoryData(today,unitId,authkey);
myHandler.post(myRunnable);
}
}.start();
}
final Runnable myRunnable = new Runnable() {
public void run() {
IteratorMapString, String iterator =
response.iterator();
while(iterator.hasNext()){
MapString, String item =
iterator.next();
mMap.addMarker(new
MarkerOptions()
.position(new
LatLng(Double.parseDouble(item.get(latitude)),
Double.parseDouble(item.get(longitude
.title(item.get(address)));
}
}
};
--
Lew
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Re: [android-developers] pass parameters between threads
Yeah i was thinking the same thing.
But, how come no one asks him why he wants to get the response data back
in the main thread ? It seems like he believes he needs to pass stuff
around so other threads will have access to them (i dont see any UI related
calls that would require them to be run on the UI thread). He needs to do
more learning on Scopes and Java Threads than info on ASyncTasks.
On Wednesday, January 23, 2013 6:24:30 AM UTC+2, droidDev wrote:
.. What you said there doesn't make sense. A variable has to be
explicitly declared as a class or instance member; it doesn't just
magically appear when you remove a local variable.
I think what John was describing does make sense. He had inadvertently
created a new response var in an inner scope, thereby effectively masking
out his pre-existing instance var of the same name; therefore the response
data was being discarded each time the inner scope was exited.
On Jan 8, 2013 6:29 PM, John Merlino stoi...@aol.com javascript:
wrote:
I have a thread to make a web service request. And then I get the data
and store it in response variable. Now I need to add items to the map
on the main thread, but how do i get the response data back in the
main thread. Here is what I have:
private void processHistory(final String authkey, final String unitId)
{
new Thread(){
public void run(){
ListMapString, String response =
WebService.getHistoryData(today,unitId,authkey);
myHandler.post(myRunnable);
}
}.start();
}
final Runnable myRunnable = new Runnable() {
public void run() {
IteratorMapString, String iterator =
response.iterator();
while(iterator.hasNext()){
MapString, String item =
iterator.next();
mMap.addMarker(new MarkerOptions()
.position(new
LatLng(Double.parseDouble(item.get(latitude)),
Double.parseDouble(item.get(longitude
.title(item.get(address)));
}
}
};
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Re: [android-developers] pass parameters between threads
droidDev wrote:
You forgot to attribute the quote there, sport.
Lew said:
.. What you said there doesn't make sense. A variable has to be
explicitly declared as a class or instance member; it doesn't just
magically appear when you remove a local variable.
I think what John was describing does make sense. He had inadvertently
created a new response var in an inner scope, thereby effectively masking
out his pre-existing instance var of the same name; therefore the response
data was being discarded each time the inner scope was exited.
How do you know that? His code showed nothing like that. There was no
instance variable,
or even class definition shown. He referred to a 'type declaration
MapString, String' but
nothing was shown declared to be that type. The only place that appeared
was in a generic
type argument, but removing that would not un-shadow (mask is not a Java
term) an instance
variable.
Evidence?
John Merlino wrote:
I have a thread to make a web service request. And then I get the data
and store it in response variable. Now I need to add items to the map
on the main thread, but how do i get the response data back in the
main thread. Here is what I have:
private void processHistory(final String authkey, final String unitId)
{
new Thread(){
public void run(){
ListMapString, String response =
WebService.getHistoryData(today,unitId,authkey);
myHandler.post(myRunnable);
}
}.start();
}
final Runnable myRunnable = new Runnable() {
public void run() {
IteratorMapString, String iterator =
response.iterator();
while(iterator.hasNext()){
MapString, String item =
iterator.next();
mMap.addMarker(new MarkerOptions()
.position(new
LatLng(Double.parseDouble(item.get(latitude)),
Double.parseDouble(item.get(longitude
.title(item.get(address)));
}
}
};
--
Lew
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Re: [android-developers] pass parameters between threads
.. What you said there doesn't make sense. A variable has to be explicitly
declared as a class or instance member; it doesn't just magically appear
when you remove a local variable.
I think what John was describing does make sense. He had inadvertently
created a new response var in an inner scope, thereby effectively masking
out his pre-existing instance var of the same name; therefore the response
data was being discarded each time the inner scope was exited.
On Jan 8, 2013 6:29 PM, John Merlino stoici...@aol.com wrote:
I have a thread to make a web service request. And then I get the data
and store it in response variable. Now I need to add items to the map
on the main thread, but how do i get the response data back in the
main thread. Here is what I have:
private void processHistory(final String authkey, final String unitId)
{
new Thread(){
public void run(){
ListMapString, String response =
WebService.getHistoryData(today,unitId,authkey);
myHandler.post(myRunnable);
}
}.start();
}
final Runnable myRunnable = new Runnable() {
public void run() {
IteratorMapString, String iterator =
response.iterator();
while(iterator.hasNext()){
MapString, String item =
iterator.next();
mMap.addMarker(new MarkerOptions()
.position(new
LatLng(Double.parseDouble(item.get(latitude)),
Double.parseDouble(item.get(longitude
.title(item.get(address)));
}
}
};
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Re: [android-developers] pass parameters between threads
On Tue, Jan 8, 2013 at 5:27 PM, John Merlino stoici...@aol.com wrote: I have a thread to make a web service request. And then I get the data and store it in response variable. Now I need to add items to the map on the main thread, but how do i get the response data back in the main thread. Use AsyncTask. - TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
