Add library (library libreria) in Android Studio

For the JSONObject, which is the one we will use as a case:

If you know the address, in this case it would be 'org.json:json:20151123' where the numbers correspond to its version, that is the one we will use, if we cannot consult this page:

http://mvnrepository.com/artifact/org.json/json/20151123

For example, where you can see several instructions, we select the one that is about gradleand we will see something similar to the previous one ('org.json:json:20151123').

Now in your project we open build.gradle fileit and add the following instruction along with the one we got earlier. ( compile 'nombreLibraryDireccion')

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    //..
    compile 'org.json:json:20151123'
}

We synchronize and it should work for you, keep in mind not to have the offline option activated for gradle in the preferences.

You can also add it in the following way, obtaining the .jarone libraryyou want, in this case we continue with the previous one, obtaining the jar after downloading it to our computer.

Nombre : json-20151123.jar

We open and copiamosthe json-20151123.jar file in the following path:

../suProyecto/app/libs/

Now in the build.gradle fileand add the following statement ( compile files ('libs/nombreDelFichero.jar');):

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'

    //
    compile files ('libs/json-20151123.jar');
}