How to add a jar in External Libraries in android

问题:

I am new to Android Studio.Now what i need was just want to add a few jar file in the External Libraries below the < JDK > folder.

If anyone have idea about this please help me

回答1:

A late answer, although I thought of giving an in-depth answer to this question. This method is suitable for Android Studio 1.0.0 and above.

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STEPS

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1. First switch your folder structure from Android to Project.

2. Now search for the libs folder inside app - build folder.

3. Once you have pasted the .jar file inside libs folder. Right click on the jar file and at end click on Add as library. This will take care of adding compile files('libs/library_name.jar') in build.gradle [You don't have to manually enter this in your build file].

Now you can start using the library in your project.

回答2:

Add your jar file to the folder app/libs. Then right click the jar file and click "add as library".

If there is no libs folder you can create it. Click on the combo box that says "Android", and change it to "Project"

From here, you can right click on "apps" in the directory tree and go to "New" => "Directory"

回答3:

Put your JAR in app/libs, and in app/build.gradle add in the dependencies section:

compile fileTree(dir: 'libs', include: ['*.jar'])

回答4:

Create "libs" folder in app directory copy your jar file in libs folder right click on your jar file in Android Studio and Add As library... Then open build.gradle and add this:

dependencies {
    compile files('libs/your jar file.jar')
}

回答5:

This is how you can add .jar file in Android Studio 2.1.3.

1. Copy the .jar file

2. paste the file in Libs folder and then right click on .jar file and press Add as library

3. open build.gradle

4. add lines under dependencies as shown in screenshot

5. Now press play button and you are done adding .jar file

回答6:

Example with Parse jar...

Add jars to libs folder from Project view … create lib folder if not exists

Copy all jars there...

Add libs to gradle.... in build.gradle file :

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.0'
    compile 'com.android.support:design:23.0.0'
    compile 'com.android.support:percent:23.0.0'
    compile 'com.parse.bolts:bolts-android:1.+'
    compile fileTree(dir: 'libs', include: 'Parse-*.jar’)
}

For add all jars of lib folder... change Parse-*.jar to *.jar

回答7:

1. Copy these three Files from that folder where you downloaded them, and Paste it in libs folder under app folder of your project.

2. Once your JAR files are successfully copied to libs folder and we will add them as dependency files.
3. Click on File > Project Structure >Select app > Dependencies Tab.
4. Click on (+) plus button given on right side and select File Dependency.
   
5. Once you select all Jar files then click Ok button and your Gradle will Start building.

回答8:

The GUI based approach would be to add an additional module in your project.

1. From the File menu select Project Structure and click on the green plus icon on the top left.
2. The new Module dialog pops
3. From the phone and tablet application group select the "Import JAR or AAR package" option and click next.
4. Follow the steps to create a new module that contains your JAR file.
5. Click on the entry that corresponds to your main project and select the dependencies tab.
6. Add a dependency to the module that you created in step 4.

One final piece of advice. Make sure that the JAR file you include is build with at most JDK 1.7. Many problems relating to error message "com.android.dx.cf.iface.ParseException: bad class file magic (cafebabe) or version (0034.0000)" root straight to this :0.

回答9:

A simple way to add Jar file Android Studio Steps:

1. Copy and paste your jar file to libs folder of your project.
2. Click File from File menu -> Project Structure (CTRL + SHIFT + ALT + S on Windows/Linux, ⌘ + ; on Mac OS X).
3. Select Modules at the left panel -> Dependencies tab.
4. Add... → Project Library → Attach Jar.

回答10:

If anyone is looking for another solution without actually copying the jar file(s) into the project directory, e.g. when using a jar in multiple projects:

Open build.gradle and add

def myJarFolder = 'C:/Path/To/My/Jars'

[...]

dependencies {
    [...]
    compile fileTree(dir: myJarFolder + '/jar/Sub/Folder/1', include: ['*.jar'])
    compile fileTree(dir: myJarFolder + '/jar/Sub/Folder/2', include: ['*.jar'])
    [...]
}

Note that of course you don't have to use the myJarFolder variable, I find it useful though. The path can also be relative, e.g. ../../Path/To/My/Jars.
Tested with AndroidStudio 3.0

Update: For Gradle Plugin > 3.0 use implementation instead of compile:

dependencies {
        [...]
        implementation fileTree(dir: myJarFolder + '/jar/Sub/Folder/1', include: ['*.jar'])
        implementation fileTree(dir: myJarFolder + '/jar/Sub/Folder/2', include: ['*.jar'])
        [...]
    }

回答11:

The "official way" to add a jar into your android project as an external library, is to add the jar in dependencies { } section in build.gradle.

If you've done all of the above, and none of the above works, then there are two other possibilities:

1. If Android Studio or some other IDE doesn't give red underlined errors in editor but runs in error in the Java Compiler, CHECK YOUR JAR. Your jar may not have a proper Manifest included therefore the compiler doesn't know what the jar can provide/don't know it's package name
2. Maybe it's folder structure is messed up. The folder structure doesn't match with its package name. package a.b.c; should be matching to folder a > folder b > folder c.
3. The package name has some conflict. (Trust me, this happened to me and it took hours to figure it out.)

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However, if you are going with cordova, here are some tips of adding external jars.

"build-extras.gradle" is the better way to manage your gradle file.

Here are the steps to manage extra settings in cordova-based android project:

1. Adding your jar into build-extras.gradle:

   //Other settings go here, e.g.: buildscript { ... }
   ext.postBuildExtras = {
   // you may have some other settings, e.g.: android { ... }
           dependencies {
                   compile files('libs/abc.jar')
           }
   }
   

(More detailed steps here: Extending the cordova gradle file to include google services )

2. In terminal, do:

cordova build android