How to add external libraries to Android Project in Android Studio?
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You are developing an Android app on Android Studio, sometimes you want to use an external library for your project, such as a jar file.
Common langs is an java library with open source code which is provided by the Apache, it has utility methods for working with String, numbers, concurrency ...
- Download: commons-lang3-3.10.jar
Suppose that you want to use this library for your Android project. And using one of its utility methods to test whether a String is a number or not.
import org.apache.commons.lang3.StringUtils;
public class CheckNumeric {
public void test() {
String text1 = "0123a4";
String text2 = "01234";
boolean result1 = StringUtils.isNumeric(text1);
boolean result2 = StringUtils.isNumeric(text2);
System.out.println(text1 + " is a numeric? " + result1);
System.out.println(text2 + " is a numeric? " + result2);
}
}
In this document I will guide you 3 ways to use the external library:
- Add your jar files to libs folder of the project and declare it as a library to use.
- Create a Android module and copy your jar file to this module, and then declare your project using the newly created module.
- Declare and use a remote library.
Create a project named AddLibsDemo:
OK, your project has been created.
Change to Project tab:
Copy jar file to libs folder:
Right click jar files, select "Add as Library..":
Turn back to "Android" Tab, you can see that your library has been already declared in build.grade (Module: app)
OK, now your library is being already used.
Suppose you have a AddLibsDemo2 project, you want to use common-lang3-3.4.jar library for this project.
Create a Android Module:
Point to the location of the library.
Module library has been created:
Next, you need to declare the dependency of the main project into the newly created module.
- File/Project Structure
Add module dependencies:
You can check your module which has been declared in build.grade (Module: app).
Android Studio can use the library on a network, it is located in some repository on the Internet. Suppose you have AddLibDemo3 project, and you need to add the remote library to your project.
Search the library:
OK, the library has been added to the project, you can see on build.grade (Module: app).
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