Android :: Release Resources When Application Terminates?
Jul 1, 2009
I created an application which uses camera and during the appplication execution the screen is always on.
In the onCreate() method I added the lock code...
But after the application termination the screen remains on all the time and if I run the camera application it encounters an error which obviously appears because the camera resources are not released.
Does anyone know how to release all resources on application termination?
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Jul 3, 2009
I created an application which is displaying camera preview. When the application terminates I noticed that some processes are still running. Also if I try to run the original camera application it displays an error (obviously due to the active process which belongs to the custom application).
Does anyone know how to release all resources when application ends?
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Jul 6, 2009
All I'm baffled as to how this Market works. I was expecting a different version of the Market by now but things still seem awry. Say I have two apps - one free, one paid. I release updates to both. The free one is at the top of the list, but the paid one is down in the depths of the list. That kind of sucks. Is this really how it works? Or is something temporarily broken.
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Sep 3, 2009
I'm trying to figure out a way to programmatically determine if my build was built in debug mode vs. release mode. I'd like to hide some items in my settings screen if it's release. When I build my app in Eclipse I'm building by default in Debug mode. However, when I build the app using the command line, I build it in release mode and sign the app using the jarsigner tool.
I've tried using:
PackageInfo appInfo = manager.getPackageInfo("com.adobe.psmobile", PackageManager.GET_SIGNATURES);
to test if
appInfo.signatures[0].toCharsString()
matches my debug signature and that didn't seem to work.
I'm now trying to see if I can introspect the app's KeyStore, to match the default debug alias described here:
http://developer.android.com/guide/publishing/app-signing.html of "androiddebugkey"
but I haven't figured out how to retrieve the app's KeyStore yet.
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Oct 19, 2010
After finishing my android application development I used the command showing below to get private key, but it shows some errors such as "The Keystore was tampered with or password was in correct".
$ keytool -genkey -v -keystore DEBUG.keystore
-alias alias_name -keyalg RSA -keysize 2048 -validity 10000
Is my problem with DEBUG.keystore? Should I need to generate another keystore for public release?
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Jan 28, 2009
I have created a subclass of Activity, 'CustomActivity', that overrides the onCreateOptionsMenu and onOptionsItemSelected methods. In a couple of other applications I have extended this subclass to provider a common menu for each activity. Is it still possible to access the resources from this Subclass? By default it uses the resources from the current activity (Strings, xml layout etc.).
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Feb 1, 2010
How does one go about listing the resources that are available in an application?
For example, I would want to find the names of all files under /res/ xml.
Reflection on the R class didn't seem to work since the identifiers are static constants. R.xml.class.getDeclaredFields() doesn't return any fields.
The AssetManager didn't seem to work either because these are not raw assets.
Does anyone have ideas or examples?
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Aug 10, 2010
I have big files to integrate into my application (videos), and thus for not not that my application occupies all the internal memory of the telephones, I saw that it was possible with Froyo to install the applications on the SD card.
I thus have to test this solution and my application settles down well on the SD card, the only problem it is that the system installs all the same my files videos (which are placed in the file /raw) on the internal memory of the telephone. Thus my question it is where to place my videos or where to make so that these also settle down on the SD carde ?
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Sep 17, 2010
So I'm struggling a bit with what is probably a fairly basic concept.. Activity Lifecycle.I have read a bunch of thread on the topic, and I feel I understand well both the functionality, and rationale behind the lifecycle model implemented for Activities, but it raises a bit of a problem for me. My app (game) has a couple of distinct Activities for various sections:
1. The TitleActivity is a very small Activity that just launches a GLSurfaceView and renders a startup logo.I use this to detect the OpenGL capabilities of the device (eg so I know if it's using a software renderer)
2. The LaunchActivity is the main menu screen where the user can access options etc and start a game
3. The GameActivity will either launches a GLSurfaceView or a standard View depending on hardware capabilties.
The issue I am having is that I want to pre-load some "slow-to-load" resources, specifically audio, in the Title Activity so when the Launch Activity renders I can play some background music.I have the concept of a "media library" which I use throughout the game.Because of memory limitations in the SoundPool, I have limited this to only absolute real-time sounds and all others are played using mulitple instances of MediaPlayer.Hence my media library has a bunch of pre-loaded MediaPlayer instances which I access regularly during game play.. so it makes sense to have a centralized access point for all audio.All fine, however the problem is that when I launch one activity from another.. for example the TitleActivity starts the LaunchActivity (via a call to startActivity(Intent...)), the former goes through the onDestroy stage of its lifecycle.Now logically I had assumed that if I allocate a bunch of resources in the onCreate of an Activity, I should clean them up in the onDestroy, however in the case of my "media library" if I load up the audio files in the onCreate of my TitleActivity they will be torn down when the LaunchActivity is started because the TitleActivity will have its onDestroy() method called.
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Feb 24, 2010
The code I am trying to implement includes a service and an application. When the application is first launched, it starts the service using the
startService(svc_name) call. Here svc name is an intent pointing to the class that runs the service.
I want to share a resource(file/socket connection) between the service and the application. For example one writes to a file and another reads from it. I am unable to get proper sync between the service and app. Could you please let me know how this can be achieved?
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Mar 9, 2010
The Android documentation says that best practices are to make two drawable directories - one for HDPI and one for MDPI. It also says that if the MDPI directory doesn't exist and a MDPI device is running the app, it will scale down the HDPI ones so everything looks good. Is there any reason not to just make one high resolution set of graphics? One con that I can think of is performance issues and one pro I can think of is only having one set of images for your app.
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Jul 1, 2010
I have written an Android application that I am about to release, but I would like to have a 2.1 version with multitouch and a lower API version without. However, if I simply just use the minSDK setting, the 1.6+ version would show up in the market with the 2.1 version on 2.1 phones. Is there any way to release for a specific range of OS versions?
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Jul 11, 2010
In my Android project, I want to loop through the entire collection of Drawable resources. Normally, you can only retrieve a specific resource via its ID using something like:
InputStream is = Resources.getSystem().openRawResource(resourceId)
However, I want to get all Drawable resources where I won't know their ID's beforehand. Is there a collection I can loop through or perhaps a way to get the list of resource ID's given the resources in my project?
Or, is there a way for me in Java to extract all property values from the R.drawable static class?
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May 29, 2010
Just a heads up - ADW Launcher (in my opinion the best launcher available) is now in the Market (free!)? Many bug fixes over the release candidates. Use it, love it, if you haven't tried it, GET IT!
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May 17, 2010
I was wondering what people do to limit the phones that can purchase my app on Android Market. I image I can limit this to some extent by using the API levels in the manifest but can I limit my app to just Droid/Milestone? I have only tested the app on these phones so I can't be sure that it will work on others. There are known issues with the Milestone and choosing an OpenGL config, among other issues, that I had to work around so it's not unreasonable that other phones can have similar issues. Also how do you do dynamic licenses via http post?
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May 22, 2009
I have a problem with firing an activity that extends MapActivity. When it gets called, it throws a java.lang.NoClassDefFoundError... not sure what this is supposed to mean. I think something goes wrong with the external implementation of the maps API (maps.jar). Has anyone come across that problem? Here's the srack trace:
CODE:....................
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May 4, 2009
I am following the instructions on code signing on the Android Developer site, and it mentions that if you specify that you want to compile in Debug mode, it automatically signs the resulting file with a debug key. It also says that if you specify that Eclipse should compile in Release mode, that you can use the Export Wizard to generate a private key and handle the distribution signing.
Can someone point me to the setting in Eclipse for Release vs. Debug compiling. When I use the Export Wizard, I am only given the option to export unsigned. I am pretty sure I am stuck in Debug mode, since my app has no problem running in the emulator or my tethered G1.
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Mar 4, 2009
I have a so called reliable resource who works in the T-mobile store, and so far he has been right about anything to do with G1. He predicted the OTA release, and that was right, but he has also said T- mobile will be releasing the cupcake to t-mobile customers in uk end of March. Of course all i/we can do is wait. if anyone has any information to back that claim it would be appreciated. I know there's loads of cupcake talk that has been going on for months. but i believe this is the real thing, else he wouldn't jeapordise these claims to get people to buy the G1 and then get hundreds of complaints if it didnt happen
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Sep 22, 2010
I'm getting this error ( in the end of this post) which I guess I understand it's because I'm calling something after releasing it.. but I can't find a wy to work it around.I've tried all combinations.. I've tried: mCamera.setPreviewCallback(null); This class, where the surfaceview is implemented can be accessed by 2 different classes one that doesnt implement surfaceview and other that does the error just shows me when I go from the activity that uses the camera to the activity that also uses camera.I don't know what else to do.
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Dec 16, 2009
It doesn't seems as if the the stop and release immediately terminates the audio played by the MODE_STREAM track. It looks like it finishes playing the rest of the buffer and then stops.
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Jul 10, 2009
I want to release a demo version of my app. I added a restriction that the app could only be used 5 times by storing a counter in the db. However a user can easily uninstall and install the demo again! What the best way to manage this?
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Sep 15, 2009
When I use wake lock to screen at the specific time on the device as follows code. But every time I release this wake lock, the screen will force to close. I think it must to release the wake lock, or screen will always on. It's wasting power. Does anyone knows how to release the screen wake lock and don't need to close the screen?
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Oct 28, 2010
Is there a way to change free app into paid app in Market? I.e. you release com.foo.xxx as free but later you'd like to charge for app and drop free version completely.. I do not see anything like this in Market console at the moment. I know I can release com.foo.xxx.pro for example but my intention would be to keep package name as is so current users would see there's upgrade available. Alternatively, if there's no way to do that can I completely remove app from market so com. would be reusable for other app?
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Mar 16, 2009
What percentage of users are going to have 1.1 upgrade? Don't want to be flooded by 1 star feedbacks!
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Nov 24, 2010
I can't find a tutorial online that gives me the step by step process on how to generate a suitable key using the keytool in the JDK.
This: http://developer.android.com/guide/publishing/app-signing.html
Talks about it and gives commands, but it doesn't actually say where and in what folder to key in the commands. I am sure I am missing something easy here, but could anyone guide me to where I need to start with this?
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Oct 7, 2010
I used some of the code from the Android sdk examples.Legally I know apache is compatible with GPL3 (license for my code), but what do I do about the copyright notice in the code?Do I keep the "Copyright (C) 2009 The Android Open Source Project" and apache license and just indicate the content was changed.Has anyone dealt with this? The Legal dept has no clue.
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Mar 27, 2010
Is it possible to upgrade Android dev phone (the first version) to latest release (either 2.0 or 2.1)?
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May 20, 2010
Android 2.2 Froyo Update: HTC Release Date Plans in 2010 : Product Reviews Net. Hopefully this holds true and at the beginning of Q2 like June 4th!
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Oct 11, 2010
Well, they officially were approved from Itunes (Apple) a little earlier today and it is live. What disappoints me is the fact that they said they submitted it to Android Apps but it doesn't take but a few hrs to go through Android submitting process. And this was a few days ago from what I understand. I wonder when we will get it. I've been waiting for it since they announced the release of the Apple version. From the reviews I've been reading on itunes they said fairly positive. Minor things here and there but overall they are saying the video quality isn't half bad. Not as great as facetime but hell I'm sure it's better then movicha and the other one.
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Aug 22, 2010
I want to release multiple applications to android marketplace which are all very slightly customized based on a code base. I can't just change the package indentifier in the AndroidManifest.xml file because several other things dependet on this like action identifiers and so on.
What is the best approach to release several apps based on one eclipse project with the same code base?
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