I cannot understand the purpose of the libs folder in the application under Android.
It is where all the libraries referenced by your application are stored
If you use the Android command line to create your project, it'll default to libs/. It turns out that the Android Ant tasks are set to look in libs/ by default.
See $ANDROID_HOME/tools/ant/main_rules.xml:
<property name="jar.libs.dir" value="libs" />
If you just care about Eclipse, you can use whatever you want.
It contain all the libraries referenced by your application are stored
In newer revisions of ADT (revision 17 onwards), the Ant-based build system and the Eclipse plug-in are aligned so that they behave the same way. This means, by default, only the jars that are present in the libs folder are included in the final apk file. These jars would automatically appear under "Android Dependencies" in your Eclipse project.
For more details please refer here. http://tools.android.com/recent/dealingwithdependenciesinandroidprojects
Please review the following from the android developer site:
http://developer.android.com/tools/projects/index.html#ApplicationProjects
libs/
Contains private libraries.
You can find a lot of additional helpful information there as a new developer!
Because Google says we should add the jars to /libs folder and the /lib folder is used for shared library files that executables make use of.
If you use 3rd party libraries, you will add the jars to the libs folder.
Related
I'm currently using Eclipse ADT 23.0.7 for android app development. My SDK manager is updated for Android 6.0 shown in below..I want to use v7 Preference Support Library in my project. but, unfortunately I can't found it in my (sdk)/extras/android/support/v7 directory as stated in Android Developer Website. I can't figure out what to do. Thanks in advance for any kind of help!UPDATE 1I've also tried to re-download the library but, nothing happen. Preference library is still missing.
Google stopped to provide Eclipse projects. It pushes developers to migrate from Eclipse to Android Studio. So all libraries are available as *.aar files
But it is still possible to these files in Eclipse.
Find the aar for your library at \android-sdk\extras\android\m2repository\com\android\support\preference-v7\23.0.1\
Then use instructions from CommonsWare guy Consuming AARs from Eclipse:
UnZIP the AAR into some directory.
Create an empty directory that will be the home for the Android
library project. For the rest of these steps, I will refer to this as
“the output directory”.
Copy the AndroidManifest.xml, res/, and assets/ directories from the
AAR into the output directory.
Create a libs/ directory in the output directory. Copy into libs/ the
classes.jar from the root of the unZIPped AAR, plus anything in libs/
in the AAR (e.g., mediarouter-v7 has its own JAR of proprietary bits).
Decide what build SDK you want to try to use. You might just choose
the highest SDK version you have installed. Or, you can use the
android:minSdkVersion and the -vNN resource set qualifiers to get
clues as to what a good build SDK might be. If desired, create a
project.properties file with a target=android-NNN line, where NNN is
your chosen build SDK. Or, you can address this in Eclipse later on.
Import the resulting project into Eclipse, and if needed adjust the
build SDK (Project > Properties > Android). Also, you will need to
attach to this library project any library projects it depends upon
(e.g., mediarouter-v7 depends upon appcompat-v7).
I'm currently using Eclipse ADT 23.0.7 for android app development. My SDK manager is updated for Android 6.0 shown in below..I want to use v7 Preference Support Library in my project. but, unfortunately I can't found it in my (sdk)/extras/android/support/v7 directory as stated in Android Developer Website. I can't figure out what to do. Thanks in advance for any kind of help!UPDATE 1I've also tried to re-download the library but, nothing happen. Preference library is still missing.
Google stopped to provide Eclipse projects. It pushes developers to migrate from Eclipse to Android Studio. So all libraries are available as *.aar files
But it is still possible to these files in Eclipse.
Find the aar for your library at \android-sdk\extras\android\m2repository\com\android\support\preference-v7\23.0.1\
Then use instructions from CommonsWare guy Consuming AARs from Eclipse:
UnZIP the AAR into some directory.
Create an empty directory that will be the home for the Android
library project. For the rest of these steps, I will refer to this as
“the output directory”.
Copy the AndroidManifest.xml, res/, and assets/ directories from the
AAR into the output directory.
Create a libs/ directory in the output directory. Copy into libs/ the
classes.jar from the root of the unZIPped AAR, plus anything in libs/
in the AAR (e.g., mediarouter-v7 has its own JAR of proprietary bits).
Decide what build SDK you want to try to use. You might just choose
the highest SDK version you have installed. Or, you can use the
android:minSdkVersion and the -vNN resource set qualifiers to get
clues as to what a good build SDK might be. If desired, create a
project.properties file with a target=android-NNN line, where NNN is
your chosen build SDK. Or, you can address this in Eclipse later on.
Import the resulting project into Eclipse, and if needed adjust the
build SDK (Project > Properties > Android). Also, you will need to
attach to this library project any library projects it depends upon
(e.g., mediarouter-v7 depends upon appcompat-v7).
As the topic indicates I would like to create a jar library that uses some android functions (no layouts) and that will be included in an Android project.
Is that possible and how?
From the research I've made I managed to include a simple jar file that uses pure Java (JAVA SE 1.6), but
when I tried creating a jar file I encountered the following exception when I tried to run the Andoid app: FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: mylib.pleasework.amen
I tried including android.jar in my library and removing the java library, so that the jar file is build against android sdk, but it didn't work.
I tried including the jar file under a /libs folder as it is said to be the correct way to import jars in android projects from ADT v17 and after, but that didn't work either.
The jar I want to create will not use any resources (xml layouts, strings.xml) just Log.d and WifiManager.I am aware of Android Library Project but my library source is sensitive and I am afraid that it won't be safe if exposed in a Android library project. I was thinking of creating a jar and using ProGuard ( http://developer.android.com/tools/help/proguard.html ) obfuscate it.
I think I mentioned everything. Any help will be appreciated.
Thanks,
Thomas
As the topic indicates I would like to create a jar library that uses some android functions (no layouts) and that will be included in an Android project. Is that possible and how?
Use the jar command, or the <jar> Ant task. I am sure that there are ways to export a JAR from Eclipse, but I personally have never used them.
For example, in this GitHub repo I have a reusable component and a sub-project that is a sample app. My build.xml for the repo contains the following custom task:
<target name="jar" depends="debug">
<jar
destfile="bin/CWAC-WakefulIntentService.jar"
basedir="bin/classes"
/>
</target>
This generates a JAR file, that other Android applications can use by adding to their libs/ directories.
I am aware of Android Library Project but my library source is sensitive and I am afraid that it won't be safe if exposed in a Android library project.
It won't be safe exposed as a JAR, then, either. You can create an Android library project for public consumption that replaces the src/ tree's contents with a compiled JAR in libs/ in the library.
The way I did it in the end was: to create an Android Library project (check isLibrary checkbox in project properties) export it through Eclipse (right click on the project->export->jar file, careful to deselect all resources - res folder, androidmanifest.xml, *.png etc) and put it in the project you want by importing it under /libs folder. I don't know if this is the best solution but it worked for me.Used ADT r20, Eclipse 3.7.1, Android api level 7
I am going to create a library project which has several dependencies (jar files).
I am confused because I've seen some android projects which has LIB or LIBS folder under project root folder (together with bin,gen,res,src.etc..)
Even I add LIB or LIBS folder, then put the jar files on it. Still need to set the project properties in order to recognize the added jar files by doing Project Properties => Java Build Path => Libraries tab => Add JARs... button.
I am using Eclipse with Android Plugin.
When I add LIBS, it will appear the Android logo on the top of the LIBS folder. It is recognized by the plugin but still need to set it in the project properties (same the above adding JARs)
Which is the correct directory structure for Android Project?
If you use the Android command line to create your project, it'll default to libs/. It turns out that the Android Ant tasks are set to look in libs/ by default.
See $ANDROID_HOME/tools/ant/main_rules.xml:
<property name="jar.libs.dir" value="libs" />
If you just care about Eclipse, you can use whatever you want.
In newer revisions of ADT (revision 17 onwards), the Ant-based build system and the Eclipse plug-in are aligned so that they behave the same way. This means, by default, only the jars that are present in the libs folder are included in the final apk file. These jars would automatically appear under "Android Dependencies" in your Eclipse project.
For more details please refer here. http://tools.android.com/recent/dealingwithdependenciesinandroidprojects
It doesn't matter actually. It can be lib or libs. Whether jar files are in lib or in libs, you just need to do right click on project, select "Build path => Add to build path" , thats it.
Citing: http://tools.android.com/recent/dealingwithdependenciesinandroidprojects
If you are still referencing jar libraries manually instead of putting them under libs/ be aware of the following:
If the project is a Library project, these jar libraries will not be automatically visible to application projects. You should really move these to libs/
If the project is an application, this can work but you must make sure to mark the jar files as exported.
I am trying to use Roboguice in my app, but no matter how i try to add the jars they don't seem to be added to the apk doesn't include the roboguice/guice jars. What do I do? using eclipse 3.5 and adt .9.9
where did you put the jars?
I usually put 3rd party jars in the lib folder at the root of your Project folder (same level as src, assets etc) and they seem to get picked up when building the apk. Make sure in Eclipse you are referring to the jar from the lib folder as well!