Android :: Best Practice Design Pattern For 2D HUD Screen Navigation?
Aug 23, 2010
I fight with me for some days about asking this question.
Its pretty plain and simple:
If you have an application with a GUI totally working on 2D drawing, what should be the best practice to handle what to draw and where to touch?!
Some example for better understanding:
I have a game with a map. On this map I can build houses and stuff.
I also have a information bar which can be extended. On the extended bar I draw some information about the game and also enables to change different values. If a touch occurs, I have to check, if the information bar is extended or not to determine if I want to change something on the map or something on the bar.
Thats done by the State Pattern, but I have some doubt if thats the right one because I think it can be a bit complex because of possible "sub-states".
So basically the question: Is the State Pattern (from GoF) the best practice to handle a pure graphical GUI?
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Apr 28, 2010
While programming on Android, I end up writing a parent activity which is extended by several others. A bit like ListActivity. My parent activity extends Activity. if I intend to use a Map or a List, I can't use my parent activity as superclass - the child activity can only extend one activity obviously. As such I end up writing my parent activities with the same logic for Activity, ListActivity, MapActivity and so forth.
What am I looking for is some sort of trait functionality/design pattern which would help in this case. Any suggestions?
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Feb 23, 2010
Does the Android platform lend itself well to a particular style of UI programming like MVC or MVP? Most of my UI experience is with spaghetti code on a very old embedded device or in GWT with MVP so I do not know where to start.
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Oct 29, 2010
I have several related database tables and I would like to treat their rows as objects and their tables as something like lists. What are the considerations that I have to keep in mind (for instance, ensuring that the objects stay consistent with one another and with the database, lazy loading)? And what is a good design pattern for implementing this? As I imaging the answer is pretty involved, a link to a good website would suffice.
On the other hand, if someone knows of Hibernate-like thing that really works on Android, I might give that a whirl (although it's a little heavy weight for me right now).
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Apr 6, 2010
I've got a common task that I do with some Activities - downloading data then displaying it. I've got the downloading part down pat; it is, of course, a little tricky due to the possibility of the user changing the orientation or cancelling the Activity before the download is complete, but the code is there. There is enough code handling these cases such that I don't want to have to copy/paste it to each Activity I have, so I thought to create an abstract subclass Activity itself such that it handles a single background download which then launches a method which fills the page with data.
This all works. The issue is that, due to single inheritance, I am forced to recreate the exact same class for any other type of Activity - for example, I use Activity, ListActivity and MapActivity. To use the same technique for all three requires three duplicate classes, except each extends a different Activity.
Is there a design pattern that can cut down on the code duplication? As it stands, I have saved much duplication already, but it pains me to see the exact same code in three classes just so that they each subclass a different type of Activity.
Edit: Since it seems I need to be a bit more specific...
Suppose I'm trying to solve the problem of an AsyncTask background download during orientation changes. The solution I have right now is to use callbacks; there's download manager that I have which starts these downloads, and then I have the Activity attach a callback to it. When the orientation changes the Activity is destroyed and then recreated; during this process I detach the old Activity's callback, then attach a new callback from the new Activity afterwards.
Orientation changes are a common problem, and in multiple Activities I start the Activity with a progress view while the data loads. What I am trying to solve is not having to re-implement this orientation-handling logic ten times over; my initial solution was to subclass Activity, but then I got the problem above.
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Sep 6, 2010
As i am building multiple activities, i realise that i have to code out repetitively this segment.
CODE:.......
So that i can return to the home page.
Is there some structural pattern or design pattern that i am missing out? Like a Activities Manager that manage all the activities?
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Oct 6, 2010
Anyone know of an android app for kids to practice writing their letters on the screen with a fingertip? Similar to writepad or abc pocketphonics for the iphone.
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Nov 8, 2010
I have a requirement where few of my image views form border areas of an application, the application will be running on many screen sizes.
I'll be creating a uniform image for the smallest size possible, which can be repeated as many times as needed, and still presents the same image.
i want the image view to replicate the image contained whenever it is increased.
Perhaps I was able to describe my problem.
Is anything like this possible?
I tried 9-patch images, but I couldn't find nice articles on it which could explain how to create useful images with it which could suite my need.
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Aug 2, 2010
I'm a web designer by nature, accustomed to changing resolutions and font sizes, but I'm unsure how to design for the Android platform without knowledge of screen sizes, especially when the screen rotates from portrait mode to landscape.
Should I just do generic things that tile, or is there a way to design things of static size?
By this, I mean for the GUI and graphics, not element nodes of the XML.
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Mar 3, 2010
1) Is there way to find if the Android "unlock pattern screen" is ON/ OFF thru programming? My Aim is to send some messages from my application to a server thru network only when the user had unlocked this password kind of screen (device).
2) Is there any Android/Java class to generically find (query) if certain application window is currently on top like question 1? In other words, any Windows manager class to get some info/enumerate windows that are currently being displayed/being in use.
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Nov 23, 2010
public class check extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);}
void myonclick(View view)
{
Intent mIntent = new Intent(this,check2.class);
startActivity(mIntent);...............
when i click a button it will show error in emulator has (The Application Check has stopped unexpectedly).
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Nov 27, 2009
I can't seem to UNcheck the box to disable the unlock pattern. Please tell me there's a way as I am now sick of having the draw the pattern.
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Jul 5, 2010
I want to provide my own version of password mechanism. Is this possible?
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Nov 23, 2010
I am going to develop an Android Application but before developing it i needs to have MockUp for the Android Application,so is there any way to design MockUp/GUI Design tool for the Android Application?
I know about DroidDraw tool , but i think it is not the exact way to prepare Mockup for the android application.
I have already referred this SO Question , but overthere i just found all the tools for the I-Phone only. So please feel free to share with me if you have/found any !
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Apr 20, 2009
We are writing our own application to substitute G1 standard screen lock (where you have to draw a pattern between the dots on the screen). Unfortunately, I have been unable to find documents on how to hook our application in, so that it would be called instead of the standard G1 screen lock. Is there a broadcast sent when the standard lock is activated?
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Feb 11, 2010
I'm tired of those *** dots! Any way possible to get a numerical pattern like the iPhone has?
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Feb 15, 2010
Is there a way, some API one can call to detect if the user has set a screen unlock pattern or not?
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Dec 25, 2012
So I bought this TV the other day and along with it came this non-branded Samsung Galaxy Y rip off. I decided to make a quick buck off it by selling it online, but the problem is, It comes with pattern lock screen and a combination that I know nothing of. I tried putting my SIM into and calling, but the furthest I got was the contacts and messages tab. How else can I reset the phone?
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Jan 27, 2012
For about a year I was using an HTC Desire with Android 2.2.1 Froyo. Here I was using a default pattern lock screen }by default I mean native, not any app from Market). On this screen there was the background I had set for my home/lock page and also there were some other information (time, date, battery status when charging, etc.).
Yesterday I've (finally) bought an HTC Sensation XE (in USA known as Rezound) which has Android 2.3.4. Here on pattern lock screen there is no background, only a black color and also no other info as I was used to with Android 2.2.1.
Do You know if there is some setting or workaround to just have a normal background image I have set for my home/lock screen or is this option totally gone here and the black is only I can get?
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Oct 31, 2010
I am writing a application and it should be protected with a password. Instead of building a new one, Is it possible to use the Android's Pattern lock screen from application with different patterns?
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May 1, 2010
What happens if I enabled the pattern lock by updating the setting LOCK_PATTERN_ENABLED, but have never set a pattern? I would check, but I don't want to reset my phone (I don't see a way to clear the lock pattern). Does anyone know?
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Jun 7, 2010
I'm facing a problem regarding to design issue, to understand problem i uploaded a screen shot.
I checked in emulator, it works well but when i try the same application in HTC Sprint mobile which screen size is 4.3" and resolution is 480*800(HVGA) but there did not display appropriate (check attachment for screen shot).
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Nov 28, 2010
Anyone else notice the pattern screen lock is completely bypassed by just popping the keyboard out.
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Apr 29, 2010
So I use the pattern lock, but if someone's messing with it and tries more than the allowable tries, it'll lock you out for awhile. Is there any way to turn off the limit of allowable amount of unlock attempts?
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Jan 28, 2013
Is there any lock screen application that would have patter lock screen option which would not cause double lock screen behavior (pattern+slide)?
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Dec 11, 2009
The subject is pretty much it. With pattern lock security enabled, what happens during an incoming call? Must you enter the pattern to pick up the call, or can you simply press "Send"?
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Dec 9, 2009
It seems like there should be an easy fix (change a setting or something) for this, but I can't seem to find it and it's driving me nuts.
Whenever I use Google Navigation, the screen times out after a minute (just like any other time I'm using my phone). But, doesn't it seem like the screen should not shut off EVER while using Nav?
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Sep 18, 2009
it's easy enough to turn on the unlock pattern security feature and it was fun to give it a try but now I'm just wondering - is there any way to turn it off?? I've tried searching and even in the user guide it says nothing about being able to disable it. If anyone knows how to do this/whether it is possible please let me know - only because I'm finding it kind of annoying now!
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Nov 15, 2010
I'd really like to be able to read my most recent text BEFORE I unlock my pattern lock screen. Preferably in the form of a popup. I really don't care if it's over it or on top I just want to be able to read it before I unlock. I've done a good deal of searching, on xda and elsewhere, and I really can't find any information on how I might be able to do this. I tried playing with the popup settings in handcent and I have got the pop up to show up over the lockscreen, but if the screen turns back off then I have to unlock the phone to see the text again. Is there anything I can do about that?
I even tried playing around with Sms Popup with no luck either. Could I perhaps somehow remove the background on my pattern lockscreen so that I can see the popup behind it? I'd also like to add that I'd really rather not use any third party lockscreen apps like WidgetLocker or Lock 2.0 because I really don't like them. I know it's kind of a specific question but it's just kind of an aesthetics thing I guess.
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Aug 17, 2010
I would love to stop using the HTC lock screen and use only the pattern unlock - any ideas how to do that?
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