Android :: Subclasses Vs Constructors - Difference Between Them?
Jan 15, 2010Could someone explain the difference between a subclass and a constructor?
View 2 RepliesCould someone explain the difference between a subclass and a constructor?
View 2 RepliesDo Android have any way to instantiate objects without calling any of its constructors? In Java, Sun have sun.reflect.ReflectionFactory.getReflectionFactory().newConstructorForSerialization(), in .Net we have System.Runtime.Serialization.FormatterServices.GetUninitializedObject() but I was not able to find anything like that in the Android platform.
View 3 Replies View RelatedIs is bad practice to pass the Context to a constructor and save it as a private variable for internal use? The other option is to pass the Context as a parameter to methods that need it.
Which is the better option?
I have a feeling that passing to the constructor might result in memory leaks accidentally.
Looking at various pages in the Android docs, some of them list "Known Indirect Subclasses". What does this mean?
View 1 Replies View RelatedI'm working on a game for Android. To help implement it, my idea is to create a subclass of a view. I would then insert several instances of this class as children of the main view. Each instance would handle detecting when it was pressed (via OnTouchListener).
The problem I'm having now is how do I loop through all these sub-views so I can read their statuses and process them? (I.e. when they all reach a certain state something should happen). Or is there a better way to have several objects on the screen that respond to touch and whose status I can check?
I'm working on a Java Android game. Games here generally need to use memory pools to avoid garbage collection.Making use of subclasses is a pain when using memory pools as you need to e.g. say how many Roamer and Chaser objects you want upfront and not just how many Enemy objects you might need.I would then have an update function that checked the "type" variable and updated accordingly. This is obviously a more C-like approach. It feels hacky though because e.g. a roamer enemy will have a "target" variable it never uses. I'm unlikely to have more than a 100 enemies in memory at a time though so it really isn't a big deal memory wise. I just want some compromise between nice code and speed.Does anyone have any comments on how best to structure this? Is merging classes like this going too far? Is this ever a good idea? Should I just use a regular class tree?
View 4 Replies View RelatedMy Question is, why do we create inner classes or subclasses in android. Like the following example ...
View 13 Replies View RelatedI am New to the android ,what is the difference between android sdk 1.5 and android sdk 2.0
View 3 Replies View RelatedIf so what is it, and which one is made accessible by Android being open source? (Yup, I'm a newbie.)
View 7 Replies View RelatedCan anyone tell what is the difference between px, dip, dp and sp in android?
View 2 Replies View RelatedIn android build environment, what is the difference between 'mmm' and 'mm' command?
View 2 Replies View RelatedIs there a difference between the one that came loaded on the phone and the app in Android Market?
View 1 Replies View Relatedwhat is the scenario that makes me to pick between startActivity and startSubActivity
View 2 Replies View RelatedWhat are the differences between StageFright and Opencore? What does this mean to app developers? Please point me to any links, tutorials online. 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+unsubscribe@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
View 6 Replies View RelatedBetween rooted and Unrooted? I see it being brought up all the time in these forums? And when I get my EVO what should I do?
View 3 Replies View RelatedWhat is the difference between these two backup solutions? I am rooted now with Clockwork Recovery installed via ROM Manager, and I have successfully created a "nandroid" backup with Clockwork.
Now, many that have Clockwork also use Titanium Backup for root users. What is the advantage of using Titanium, or does each backup method serve different purposes?
Is it that the nandroid backups can only be used on the same device on which it was created, and Titanium can be used when migrating to a new and different device in order to preserve app data?
I was looking at an Android powered Tablet made in China. They are confirming that it is running version 2.2. But when looking at the about phone UI, it shows that the version is "2.2-update1". Is this real? Or is it 2.1 with some 2.2 features? Any advise would be appreciated, since I wanted to buy these ASAP.
View 2 Replies View RelatedI want to download some data from internet.It should not block main UI thread. I know both thread and service can handle the work. What is the difference between them?
View 4 Replies View RelatedOn methods like these kind, onItemClick(AdapterView parent, View view, int position, long id), what's the difference between position and id.
View 2 Replies View RelatedI'm usign starMethodTrace() and stopmethodTtrace() to get trace data to use on traceview. Everything seems to work fine. I test my app for 50 (real world) seconds having two important events after 15 and 45 seconds from start tracing. However, when analyzing the traceview's timeline I found the total tracetime is only 1.068,964 (msec). My two events are displayed as they were occurred at time 257,743 msec and 642,654 msec. This is just about 1 second of total execution time. Why there is this huge difference between real world time and trace view time? May be because I have a lot of idle time? Is there a way to relate the times displayed in the time line with real world time?
View 2 Replies View RelatedThere are several different ways of definition the ID. What is the difference? android:id="@id/android:list" android:id="@+id/android:list" android:id="@+id/confirm"
View 3 Replies View RelatedI have an HTC Droid Eris, and am curious about the different email apps that came pre-installed. What exactly is the difference between the Mail app and the Gmail app (other than the obvious fact that Gmail only caters to Gmail accounts)? The only email account I use is a Gmail one - is there an advantage to using one over the other for me? I also noticed that the Mail app starts automatically, even if for now I'm not using it at all.
View 17 Replies View RelatedI'm new to the world of android so trying to get used to all the stuff on here. Whats the difference between using specific apps e.g. facebook / ebay etc or just going on the web and visiting these places? Do they use a lot less internet allowance? Any other advantages / disadvantages?
View 2 Replies View RelatedWhat is the difference between Skype and Swype?
View 8 Replies View RelatedI do not know the difference between these two attributes and for the height also. Take a TextView for example, what would happen if I set its layout_width to wrap_content and set its width to 50 dip?
View 1 Replies View Relatedwhat is the difference between padding and margin?
i want to draw a view exactly at 200 dip from the top of the screen(0,0). there are some layout in the middle.
how do i draw a view exactly at 200 dip from the top?
What's the difference? Android and Me seems pretty excited about Gowalla, am I going to use this WITH foursquare or switch all together? I feel like all my friends are on foursquare already...
View 2 Replies View RelatedWhen is it necessary, or better to use a SurfaceView instead of a View?
View 3 Replies View RelatedI have a doubt that what is the difference between adapter.notifyDataSetChanged(); adapter.notifyDataSetInvalidated();
Because when i used both one by one, both worked exactly same. Please let me know what is the exact difference between these two.
Why does Android provide 2 interfaces for serializing objects? Do Serializable objects interopt with Android Binder and AIDL files?
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