title: Creating a JAR file and using it in Android Studio
body: <p>There are no good tutorials about creating a <strong>JAR</strong> file. I'm trying to create a <strong>JAR</strong> file and use it in different projects. I can create a class without an <code>Activity</code> as a library project in format of <code>ClassName.java</code>. However, I tried to create <strong>JAR</strong> files many times, but I could not succeed. Please help me step by step creating a <strong>JAR</strong> file.</p>