Android :: Multiple Versions Of Same Class File For Different SDK Targets?

Nov 5, 2009

This is for an Android application but I'm broadening the question to Java as I don't know how this is usually implemented. Assuming you have a project that targets a specific SDK version. A new release of the SDK is backward incompatible and requires changing three lines in one class. How is this managed in Java without duplicating any code(or by duplicating the least amount)?

I don't want to create two projects for only 3 lines that are different. What I'm trying to achieve in the end is a single executable that'll work for both versions. In C/C++, you'd have a #define based on the version. How do I achieve the same thing in Java?

Android :: Multiple Versions of Same Class File for Different SDK Targets?

Android :: Dynamic Class Loading To Target Multiple Versions

Aug 20, 2010

I would like to make a single Android app for multiple Android versions (possibly every one of them)
My problem is that I want to check what is the version of Android the app is currently running on, and dynamically load a class which is version dependent. This part should be ok.

I just wonder how I can achieve that without compilation errors in my Eclipse project. I mean, the project is configured for a particular target (1.5, 2.1 ...), so if a class in my project is not compatible wich the selected target, it will result in errors.

Is there a way to export this classes even if they are not fit for the platform (I thought about a separated lib, but then again : how to compile theses classes into a lib without compilation pbs?) ? This should be ok since they won't be loaded until I ask them to after having checked Android version.

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Android :: Different Versions Of Searchable.xml For Different Sdk Targets?

Nov 3, 2009

I have implemented a SearchManager which make uses of a searchable.xml with all the settings and put it in the xml/ directory.

I tried to create a new directory called xml_v4/ to add some attributes (the android:includeInGlobalSearch ie) which isn't supported in sdk3/1.5 but the xml directory seems not to be supported by the dir_suffixes.

How do I deal with this?

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Android :: Multiple API Versions Of An App

Oct 3, 2009

How can I publish two versions of my app without changing the package name, so that users may upgrade to either version, one for Anroid 1.5 and one for Android 1.6 ? I want to offer new features requiring Android 1.6 as soon as possible, but not all users will have upgraded to Android 1.6.

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Android :: Targeting Multiple OS Versions

Nov 17, 2009

We are upgrading our application to add 2.0 support. I have read and the older blog post I want to avoid using reflection if possible. I have found that if I set my minSdkVersion="3" in the application manifest but in my build path in eclipse point to the Adroid 2.0 jar file I can compile with direct calls to 2.0 code (with the relevant code to ensure they are not invoked on <2.0 devices). My question is will people with pre 2.0 devices be able to see the application in the market place in this case? What are other people using for multi-targeting different API levels with the same package.

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Android :: Having Multiple Versions Of Same App In Market

Feb 19, 2009

I am planning to have two versions of the same app available in the market - let's say "App-Lite" and "App-Advanced". They both almost the same core functionality, but App-Advanced has a bit more specific features, than the App-Lite has. Now I am thinking what would be the strategy of deploying those two apps in the market. The simple way is to provide different name space in AndroidManifest.xml for both apps, so "App-Lite" and "App-Advanced" would show up as two completely different applications and could be installed parallel on the same device. But I'm also thinking about another way of installing the App-Advanced version - like an upgrade to the App-Lite which might be already installed. To do this, I can just set the same name space for both app in AndroidManifest.xml, so after installing one app would replace the other one - I can do this from adb command line, but I'm not sure how android market would behave in this case. Will it show them as two different apps, will it show them as two different versions of the same app with the ability to upgrade from one version to another, or it just will not allow to publish two apps with the same name space? Is this scenario doable with Android Market?

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Android :: Multiple Custom Versions Of Same App

Aug 3, 2009

Whats the best way to deploy several customized versions of a Android application? Currently I have a script to exchange the resource folder for getting a customized version of my app. It works great, but all custom versions still have the same package name in the AndroidManifest.xml. Therefore it is not possible to install two customized versions of the app at the same time.

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Android :: Multiple Versions Of App With Different Package Names

Jan 8, 2010

I need to be able to easily create different "flavors" on an app, each with a unique package name so that they can coexist on the same device. Is there a simple way this can be done, which doesn't require manually updating all the imports and other references to the package name each time I change it?

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Android :: Building Multiple App Versions For Market

Feb 18, 2009

We're thinking about building light and paid versions of our app for the Market. But I am not clear what we need to do, or how to do it. (1) Do we definitely need the two versions to have different package names for the two builds ?It seems logical to do it that way, but I have not found a clear answer from Google to that question. Though I have found several people asking the same question. 2) Is there any support in Eclipse for building two similar apps with different package names from the same java and xml files ?In most of the IDEs I've used, it is a doddle to define multiple build targets for one project, but none of those mechanisms seem to be present here. And, the package name is embedded in every java file, as well as in many places in the manifest, leaving me without a tidy way to build to alternate package names.Is there a tidy way to build multiple version ? Or are we really going to end up copying the whole codebase and search-and-replacing the package name.

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Android :: How To Maintain Consistent UI Over Multiple Versions Of OS?

Sep 9, 2010

I would like to know if its possible to prevent my application from looking different every time I run it on a different android phone. For example, on stock 2.2, my seek bar (with default values and theme) has an orange color for the selected portion, whereas on a Samsung Galaxy S (with 2.1), it is green. Also the tab background is grey in stock 2.2, but blue in Galaxy S. On a similar note, my rating bar changes size too. I do not implement multiple screen resolutions and all my drawables are located in the "drawables" folder under "res". I donot specify a minimum sdk requirement.

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Android :: Multiple Concurrent Versions Of Same App / Filtered By Sdk Version?

Jul 30, 2010

I have an app on Android Market right now with a minSdkVersion corresponding to Android 1.6. I'd like to make an update that is only visible to users of Android 2.2 and higher (there is a good reason for this, which I will explain below). So I have two questions:
- First, if I publish an update with a higher minSdkVersion than the one it replaces, will existing users still be able to see and download the old version if their device is not >= that minSdkVersion? - Secondly, if so, would it be possible to publish updates to that older version branch? Or would it become a fossil relic, but at least always there for downlevel users? Now for the background. My apps use a large amount of resource files-- about 15MB for the Lite version, and about 55 for the Full version. Prior to Android 2.2, it was not possible to install an app on the SD card, so my solution to this was to have the app contain the bare essentials, and simply download the other resources from my web servers at first-run. However, this means that I must maintain external infrastructure, and it's also a bad experience for users who must download the app, then start another download sequence (I already have had several complaints about this in my user comments). What I would like to do is to keep the app as it is for users with Android OS < 2.2. I'd like to publish an update that is only visible to users with Android OS >= 2.2 which packages everything into the app and allows it to be stored on the SD card. And I'd like to be able to perform maintenance on both versions as needed. Why can't I just do the update as described above to a single branch of the app? Because it would mean that users with Android OS < 2.2 would have to download a massive application to their internal memory, which could be a deal-breaker for devices with only 128MB or 256MB, which is shared with the OS. Since I already have paying customers, I don't think I can ethically create an update that would potentially consume most of a user's internal memory, when the version they purchased was only a couple MB.

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Android :: Contacts Contract / Building Across Multiple SDK Versions

Jan 11, 2010

I need my app to run on all Android versions, but the Contacts API changed in 2.0. In SDK 1.6 and earlier I use android.provider.Contacts to query the contacts DB, but this does not work in 2.0 Instead, for 2.0 I use android.provider.ContactsContract. This presents a problem: when I have code for ContactsContract, my app will not build for 1.6 and earlier. Do I need to have two separate versions of my app (one for <= 1.6 and one for 2.0 and later) or is there a way to avoid doing this?

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General :: How To Test Multiple Android Platforms / Versions

May 15, 2012

I'm contemplating the idea of developing an application for the android. I have several years of experience developing web applications with Java and so figured it shouldn't be too hard to pickup a book and learn how to do it for the android platform. So far so good; that's why I love Java.

My question is in regards to how does the android development community go about testing their applications of the various android version and phones? I think I'm more concerned about the android version rather than the phones. I'm planning on getting the Sprint Evo 4G LTE coming out on Friday, so I'm obviously going to be able to develop and test for Android 4 and HTC Sense 4 (though I don't think that is as important right? Development is usually against the OS and not the UI manager, right?). But how would I go about testing against Gingerbread, Froyo, etc.? Do you guys keep a previous old phone (like my old HTC Evo 4G) and flash diferent roms in order to test the app against previous versions of android? Are there other solutions? If it's using an old phone, does this work off-network/service? I guess you could just dump the apk on the sd card and install as third party app and test it out. As long as the app doing require phone services or mobile data network (internet) you'd be fine if you have wifi access right?

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Android :: Layout Issues For Multiple Screen Sizes / API Versions

Jan 19, 2010

I am currently trying to make my app compliant with all screen sizes / api levels. I have this mostly working, however there is 1 issue i cannot resolve: Layouts in the "layout-hdpi" folder are used by and any phone on 1.5 (API level 3). - Which i dont want, i want API level 3 phones to use the "layout" folder. So to resolve this I added "-v4" onto the folder also, this works, the folder is no longer used by 1.5 phones. However, now the folder is also not used on API Level 6 phones, for example the droid. The droid only picks up the folder if i name the folder: "layout-hdpi-v6". (Also if i put "-v3" on a folder, the layout folder is not used by API level 4 phones) My understanding is that the -v<api level> qualifer allows you to exclude phones on an API level that is too low, so -v4 should mean that the folder will be used by all phones on API level 4 and above. I am finding a folder is only used for that specific API level. Has anybody else ran into this same issue? And does anybody know of any possible solutions?

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Android :: Best Practices For Creating Multiple App Versions From A Single Codebase?

May 4, 2010

Are there any viable approaches for creating multiple .APKs out of a single codebase? The apps may share the same code, but they could have different manifest files, different resources, or different external libraries (for example in an app with both free and paid versions, the free version could have a library for display ads). Ideally, this would be a single Eclipse project, with a way to specify which app to build/debug, and possibly a command line way to batch build everything.

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Android :: Does The Dalvik File Format - .dx - Support More Instructions Than Java .class File

Apr 17, 2010

Is there anything the Dalvik VM supports (in terms of bytecode) which is not used currently because the .class files don't have it?

As an example, if people would write their own Source-to-DX converter for their functional language XYZ, would they be able to implement e. g. full tail calls although the .class file does support tail calls only under certain circumstances?

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Android :: Upload Multiple Versions For Single Android Application For SDK Levels

Dec 16, 2009

I'm developing one android application which needs to support Android OS 1.5, 1.6, and 2.0. I've three different .apk files for all three SDK. How can I upload three different .apk files on Android Market Place for single application? I would like to have all 3 versions available under one application name. is this possible? So, users with any SDK can use my application.

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Android :: Easiest Way To Release Android Application For Multiple OS Versions?

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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Android :: Preferred Way To Support Multiple Android OS Versions?

Oct 28, 2009

I have a few scenarios where I guess I am not alone with. There is no easy solution but this has to be on top of the list I think.

1. Suppose you have an application that is compiled with 1.5 and is working fine even if started on a 1.6 device. But you now want to support other resolutions, so you need to compile with 1.6. Problem: If I recompile and publish the new apk, the 1.5 users want see my applications. Users already downloaded my application can not upgrade. (will there be a "new version" available shown to them in the market?)

2. Lets say your application works fine on 1.5 and 1.6 and you decided to publish your application twice with different package names. "MyApplication 1.5" and "MyApplication 1.6" for example. Problem: The user upgrading from a older version does not know that there is a new version, because you published a new Application. You can write it into the description and tell the user to download the 1.6 version but many users might not read that Settings from the other application are lost. Your downloads are split into two applications, so you might not make it into the top ranks that easy . You might even need to publish 4 applications if you have a light and a paid version.

3. Now 2.0 SDK is available and you want to add multi touch features or any other new stuff for all 2.0 users. Problem: The above problems are getting even worse. There is no way to easily upload multiple apks for the same application. Having to rename the package is also not making this better. Every time svn freaks out and marks everything as new. Sharing code between versions is difficult because of that.

I don't know if its just "3" (provider in Austria), but I still have not received an official update to 1.6. Testing on the real device is not possible with a 1.6 image if you don't want to root your phone and update the rom manually. 2.0 will be on some devices soon, so there is definitely a need to support all 3 versions. There should be a faster update cycle for the users or a slower update of new versions meaning bigger steps. or We get an easier way to support multiple versions. This also means we need a way to know how many actual devices with version 1.5 / 1.6 / 2.0 are already sold and/or upgraded. If i know that 1.5 is only on about 5% of the devices left, then I can just stop supporting that version and upgrade.

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Android : How To Convert Class File To Dex File

Nov 12, 2010

How to convert class file to dex file in android? Is there any way?

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General :: How To Root File For All Versions

Jan 11, 2014

Is there a root file for all android versions?

Or one root file for each android version like 2.3.6 or 4.3?

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Android :: Call Java Class Methods To Other Java Class File On Android

Nov 3, 2010

i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..
In 1st activity class

import; import android.os.Bundle; import android.widget.; import android.view.; import android.content.Intent;

/** * * @author pavankumar */

public class FirstActivity extends Activity {................

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Android :: Calling An Id In An Xml File In Your Class

Nov 17, 2010

How can I detect whether or not an Image View has a picture in it upon a button click. I had a class that displays a picture and some results, but I don't want the user to be able to access those results (pushing the button) until the results have been written to that class.

So, I figured I needed to check to see if there was a picture displayed in the ImageView yet.

So something like:


But obviouslt == null isn't the right way to do it...anyone know how?

EDIT: Line 184




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Android :: Jar Of Class File Doesn't Allow Modifications?

Jan 14, 2010

can any one provide me solution to this error "The Jar of this class file belongs to container Android 2.0.1 which does not allow modifications". I have searched a lot to this problem but failed. I am using eclipse with ADT.

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Android :: Possible To Put Each Class Into It's Own Java File In Eclispe?

Apr 20, 2010

I'm coming over from C# where I can make a namespace and then have each class placed into its own .cs file if I want, but in all of the examples I've seen for android all of the methods and classes are all in one big java file.

Is it possible to put my classes in to their own java files and then import those classes into a main program java file as needed like I do in C#?

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Android :: Eclipse Class File Metadata

Jun 7, 2010

In Visual Studio, I can obtain a succinct list of public methods/members exposed in a class for which I do not have the source (i.e. bundled inside a DLL) by pressing F12 (GoToDefinition).

Similarly, I am learning the Android API - in Eclipse. Jumping to an Android framework method definition produces decompilation output which is not intuitive to read, and is very verbose. To mimic results like Visual Studio, I am considering several options:

How can I format the decompilation output to be 'cleaner' - I have looked through Eclipse's preferences menus and have not found a way to do this.

How do I 'add corresponding source files' once Google provides it, so that jumping to definition yields the actual definition?

Is there a plugin that does this already? I looked into Jadclipse, but that project has not been updated in several years, and is still a decompiler.

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Android :: Difference Between File Class And Activity

Aug 17, 2010

What's the difference between file, class and activity in android?

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Android :: Android - Use One SQLiteOpenHelper Class For Multiple Database Files

Nov 20, 2010

My app uses two databases (separate files). To handle these databases I have created two Helper classes which extend SQLiteOpenHelper, one for each database.

I am now going to add a third database and wonder whether I need to create yet another Helper class (and if I used a 4th and a 5th database would I need even more Helper classes), or can I use the same Helper class for multiple databases?

The problem that I see with trying to use just one Helper class is that I can't see how to pass the name of the individual database files to the Helper. At present the name of the database is hard-coded as a Static field of each of the Helper classes, but if I had only one Helper class I would need to be able to pass the different names in to the Constructor when creating the separate Helper objects; the problem is that the SQLiteOpenHelper Constructor seems to be called by Android with just one parameter: the Context.

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Android :: Error - Unable To Fnd Class No Such File Or Dir

Oct 18, 2010

I keep getting this when trying to start a new project

ERROR: Unable to open class file No such file or directory

I tried changing preferences to alter build path to project, but it still wouldnt work,,,

Is subfolder on desktop a bad place to install Eclipse?

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Android :: Loading 3D Models - OBJ File Into My Own Model Class

Mar 11, 2009

How are people here loading in their models? I'm just manually parsing a OBJ file into my own model class and drawing that.

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