Android :: Best Practice For Storing Application - Configuration
Apr 8, 2010
I am still learning bu find Android the cool platform for allot of useful applications. I have written a Service for doing GPS tracking and it consists of a Service and a Control activity to manage, monitor and configure the service. I am looking for the preferred way for the Control Activity to define settings for the Service, things like IP address and Update interval. I envision something like a Registry on windows where these settings can be shares and updated.
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Oct 12, 2009
Where should I store my Android application's configuration settings? Coming from the .NET world I was expecting something like .config. Do I create a file under res/values, and use that?
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Nov 3, 2010
I am considering adding a means by which my app can perform functions over Google Voice, and the functionality would make little sense if I required the user to type in a password.I'd like a reasonable plan for storing the password locally and sending it (through google-voice-java) when demanded by Google Voice.Clearly, I'd like to properly represent the risks of the chosen scheme honestly to the user. I'd like the storage to be based atop writing it into a SharedPreferences created with flags.What form of obfuscation is suitable, and with what available salting ingredients and such should I customize it?
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Apr 19, 2009
What is the best way to release two versions of an application? E.g. a free version with limited features, and a paid version with the full feature set. #ifdef would be the ideal way to do this, but Java doesn't support it. Could I do something like: try {import com.foo.myapplication.ExtraFeatures; } catch (Exception e) { // ignore it, this must be the free version}? I could manage with this kind of construct, although #ifdef really would be ideal.
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Mar 9, 2010
I'm having troubles with users that report that if they leave the application opened and after a few hours when they return to it the app crashes. I'm pretty sure it is because I'm not storing/restoring the status correctly when my process is killed by the system, but I would like to be able to test it in a repeatable way. Which is the best way to simulate the same behavior that happens when Android kills my process on low memory conditions?
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Jun 20, 2010
I am new to developing for android. I have a question regarding some best practices. My app is like a dashboard from which multiple different "sub-activities" can be started and done. I am wondering what is the best way to structure the app. One way is to have different layouts and load and unload them appropriately. The other is to start new activities using intents. At least this is what I have gathered from what I have read.
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Nov 24, 2010
I have a simple Android application that loads a page in a WebView, then most of the real work is done by the server-side scripts. Everything is working great, except that I currently have the page URL hard-coded in the Android application, sort of like this:
mWebView.loadUrl("https://www.my-application-url.com");
This was fine until this morning when I was asked to to make it so that the user is prompted to enter the URL the first time the application run, and the URL that is entered by the user is then saved and used automatically by the application from that point onward. I was also asked to make it so that the user can change the URL if they choose to do so. The reason I was asked to do this is so that users can install the server side of the application on their own servers and my Android application will be able to connect without me having to write a custom version for each user, with their URL hard-coded into the application.
I am unsure what is the best way to handle this in Android. It seems that I probably need to add some type of configuration interface to the application that is shown by default on the first run, then only when the Menu button is pressed on the following runs. From this configuration interface I guess I would then get the URL from the user and serialize it for future use. What is the best way to accomplish this?
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Oct 26, 2010
I want to do an android application that can store files from phone to a website. can u please tell me which all softwares i would need.
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Aug 2, 2010
I have developed an App that talks to a set of web services. Because the App is used in different environments and for different purposes, I would like to provide a way to automatically deploy a configuration alongside the App that contains the settings for the environment (url of the locally hosted web services for example) and App settings (such as a timer period for talking to the web services). It would be tedious to have a UI for this and have to do it on every device post installation. Things I have tried and why they didn't meet my requirements:
*Raw Resource: If I unzip the apk and change the settings file, it becomes invalid as I need to resign the apk.
*Reading straight from the apk with ZipFile/ZipEntry: Device complains upon installation that the config file is not signed.
*PreferencesActivity: Requires device side UI; It would be tedious to have a UI for this and have to do it on every device post installation.
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Jan 11, 2010
Is there any way to get in the code:
Email id
Password
SMTP host
SMTP port
Which the user used to setup his Email account with the Android built in Email application. Required because, I am written a MailSender class using JavaMail API there I need to send the mail using the details what user configured in Built in Android Email application.
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Oct 14, 2009
I am developing an app on Android that will randomly pick and display an inspirational quotation (or verse) from a large collection of quotations. On Android I can choose between a flat file and an SQLite database. The app should satisfy the following conditions:
Be scalable to 10^6 quotations and/or verses
Be very fast (i.e. retrieve and display a quotation, immediately at the touch of a button)
Be able to load new quotations from an external source (in a format I have not yet decided)
What data format must I use?
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Aug 2, 2010
I have a sizable install base already on some apps with Android 1.5 set as the minimum version. I want to update the apps to take advantage of some of the newer features offered in Android 2.0 and greater. What is the best way forward so I don't break things for my current 1.5 and 1.6 users?
If I simply update the application with a new min SDK version, will 1.5 and 1.6 users be prompted to uninstall? Or will they just not see the update? What about future development that I want to apply for everyone, say a bugfix. Will I have painted myself into a corner? Another solution would be to fork and create a new app for 2.0 users, but that is undesirable for several reasons.
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Jun 23, 2010
I have had my Desire no for almost 2 months, and like most I have tried installing and uninstalling many apps, to see what I like.Due to doing a factory reset on my phone yesterday I have layered back all the apps I was using and have noticed that I have used considerably less memory than before, making me very suspicious of the uninstall method used within the market place.Does it leave behind pieces of the app, and if so what's the cleanest method of uninstalling apps.
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Dec 4, 2009
I've been scouring the web looking for information on setting up a peer-to-peer connection between Android handsets and so far have drawn a blank. The only thing I can definitively seem to work out is that it was made a whole lot more difficult when XMPP was removed from 1.0. Apart from that, I find a couple of threads on an OpenIntents board about porting an XMPP implementation to Android that were last posted nearly 2 years ago. Has anybody solved this problem effectively? What's the best way of doing it (from a games point of view)?
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Sep 17, 2009
I'm writing an application where real-time knowledge of the GPS state is critical to convey to the user. I request GPS updates at 1000 ms intervals -- when I haven't received another update 1500 ms past the most recent update, I want to display a yellow icon, and 5000 ms after the most recent update I want to display a red icon. Currently, I'm doing it like this: private CountDownTimer gpstimeout; public void onLocationChanged(Location location) { if (gpstimeout != null) gpstimeout.cancel(); gpstimeout = new CountDownTimer(5000, 1500) { public void onTick(long m) { setYellow(); } public void onFinish() { setRed(); } }; gpstimeout.start(); }
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Mar 22, 2010
What is considered "best practice" when executing queries on a SQLite db within an Android app? Is it safe to run inserts, deletes and select queries from an AsyncTask's doInBackground ? Or should I use the UI Thread? I suppose that db queries can be "heavy" and should not use the UI thread as it can lock up the app - resulting in an ANR. If I have several AsyncTasks, should they share a connection or should they open a connection each?
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Sep 29, 2010
I'm new to developing Android applications, and have only a little experience with Java in school. I was redirected to StackOverflow from the Google groups page when I was looking for the Android Beginners group. I have a question about what is best practice to pull content from a web source and parse it. Firstly, I would eventually like to have my application threaded (by use of Handler?), however, my issue now is that the class I have created (Server) to connect and fetch content often fails to retrieve the content, which causes my JSON parser class (JSONParser) to fail, and my View to display nothing. After navigating to the previous Activity, and attempting to call the connect(), fetch(), and parse() methods on the same remote URI, it will work. Why does this (sometimes retrieve the remote data) happen sometimes, but not always? What is the best practice, including the use of ProgressDialog and the internal Handler class, to make my application seemless to the user. Is this the best place to ask this question?
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Sep 22, 2009
I am creating a database driven app for managing people. I am showing a list of people with each name in a TextView. When a TextView is clicked, I launch a new intent to show the detail for the person. My question: What's the best practices for passing the id of the person to the new intent? The TextView is displaying the name of the person, so how do I know the id of the person? Once I know the id, I know how to pass it to the new intent, but I don't know what the best way to associate the id of the person to the TextView. Is there a best practice for this?
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Aug 16, 2010
In general, I'm very impressed with Android's default text to speech engine (i.e., com.svox.pico). As expected, it mispronounces some words (as do I) and it therefore occasionally needs some pronunciation guidance. So I'm wondering about best practices for phonetically spelling out those words that the pico TTS engine mispronounces. For example, the correct pronunciation of the bird Chachalaca is CHAH-chah-LAH-kah. Here is what the TTS engine produces: mTts.speak("Chachalaca", TextToSpeech.QUEUE_ADD, null); // output: chuh-KAL-uh-KUH mTts.speak("CHAH-chah-LAH-kah", TextToSpeech.QUEUE_ADD, null); // output: CHAH-chah-EL-AY-AYCH-dash-kuh mTts.speak("CHAHchahLAHkah", TextToSpeech.QUEUE_ADD, null); // output: CHA-chah-LAH-ka mTts.speak("CHAH chah LOCKah", TextToSpeech.QUEUE_ADD, null); // output: CHAH-chah-LAH-kah Here are my questions. Is there a standard phonetic spelling recognized by the Android TTS engine? If not, are there some general rules for making custom pronunciation spellings that will make the spellings more likely to be correct in future TTS engines/versions? It appears that the Android TTS engine ignores text case. What is the best way to specify emphasis?
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Jun 16, 2009
I am quite new to Android and Java. Before I was working with C++ where the events where dispatched with messages. Now I would like to create the same user experience for Android platform and I would appreciate any of your suggestions or comments on what is the best way to bind events to user controls.
Here is an example from C++:
ON_MESSAGE(WM_RECORD_START, &CMainFrame::OnRecordStart)//Method OnRecordStarts() executes on WM_RECORD_START_MESSAGE...................
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Oct 6, 2010
Some of my app's preferences could use some more explanation than the scarce space available for the summary. Sadly, there doesn't seem to be support from the system, like an optional help button that shows a longer text. How do you solve this problem? The first thing that comes to mind is an additional custom "preference" like "more information to above entry" that opens an AlertDialog with the help text, but that's not really nice for both user (two entries for the same preference) and the developer (manual work to do in Preference Activity). A bit nicer for the user, but way more work for the developer would be custom dialogs for each preference with more text and/or a help button. Is there a better solution or even an officially recommended best practice?
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Jul 29, 2009
I didn't use much Java before Android so my knowledge concerning the gc is marginal. Now I'm developing a highly physics-based game and therefore I need to do many calculations each time step and many (25) time steps per second. At the moment I'm almost only using local objects (float) in my methods, so I guess they are allocated every time the method is called (which might be, for example, 25*100 = 2500 times a second , for 100 objects with calculations on them). This causes massive activity of the garbage collector like freeing ~10000 objects every 1-2 seconds (taking ~200ms on a real device). Now I really want to optimize that because even there's no noticeable delay due to the GC (and the frame rate is constant), this seems just not well. But I read on many documentations concerning Java optimization, that there is not much to optimize in modern versions of (desktop) Java, because the GC is fast enough. Does this apply to Android, too? Does the compiler optimize anything like frequently, steady allocated objects (like floats)? What would be best practice: keep all local objects and allocate and free them all the time or use class-global objects, even if they are only used inside one particular method (which is bad programming style but conserves GC?
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Jan 13, 2010
If I want to render just a huge map, what is the best practice when using OpenGL ES with a mobile device (Android or iPhone based)? What is the best structure to contain all the vertices, normales and texture coordinates? I guess using a interleaved structure may give you some performance benefits caused by memory caching. Ok? Should I use drawArrays or drawElements to push my data to OpenGL ES? Well, I did no testing at all but I might think, that drawElements might be faster if the GFX does not use shared memory since you do not have to push that much data. Since this is really close to metall, what do you think? (the iPhone is ARM based while the Android platform is Qualcomm based (also an ARM?)
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May 23, 2010
I'm embarking on a GUI Activity composed of a viewflipper, which I would like to contain 10 linearlayout layouts. Is it advisable to put all of my layouts into the same XML resource/layout file? If not, is there a more organized approach to coding a viewflipper with many layouts? Will having everything in the same file come at a significant performance cost?
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Apr 11, 2009
I am trying to display a high score table in my application and wanted to know the Best Practice for displaying static headers or footers. The data for the High Score tableis a REST web service returing up to 100 JSON records. I have looked at some of the previous posts http://groups.google.com/group/android-developers/browse_thread/threa. that talk about addHeaderView() & addFooterView() but they all seem to indicate that the footer or header will scroll off the screen. My 1st question is has someone been able to implement this in a clean way to allow a basic static header or footer. My second question is is their another way I could accomplish my goal of displaying my high score table besides a List View. I will be displaying 6 columns of data which will need to scroll vertically.
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Jul 18, 2010
When i have a broadcastReceiver say android.intent.action.MEDIA_BUTTON and i want to update the current activity's UI without creating a new activity, is there any good practice on this one?
What i know (might not be correct)
1) I can put the BroadcastReceiver in the same class as the activity and call the updateUI function after certain activity
2) Create a ContentObserver?
3) Communicate to a service created by the activity, use aidl. (I dont know how to get the current service if its registered from an activity)
4) Create a custom filter on the broadcastReceiver located on the same class as the activity, and use context.sendBroadcast(msg of custom filter) and in the custom filter call updateUI (same as one but more generic?)
The final flow is it would come from a BroadcastReceiver and ends up updating the UI without renewing the activity (unless the activity is dead?)
Kindly provide links/source code on your how you tackle this kind of problem.
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Mar 3, 2010
Does anyone know how I might go about accessing an Activity in an application from a BroadcastReceiver (in the same application)?
(I have some state information in the Activity I'd like to update)
I'm not sure if there is a best practice for it.
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Aug 18, 2010
Now that SENSOR_ORIENTATION is deprecated, what's the best practice for obtaining compass reading? The old way was so simple.
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Sep 13, 2010
I have a design question I was hoping someone could answer or offer guidance. I am designing a game that will initially have 100 levels but the user will have the ability to purchase additional levels. For instance when the game is released the free version will have 100 levels and then the user can buy and additional 100 levels while in the game. Does the Android SDK have any built-in methods to deliver additional content? Does and third party provider offer any such service to deliver content? If this is something that you must custom create yourself, what is the best practice for creating?
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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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