Some test text!
First, be sure you have the latest version of Android Studio. You can download the latest version here. If you already have Android Studio, check for the latest stable version by clicking Help > Check for Updates (on Mac: Android Studio > Check for Updates).
Download the PDFTron Android SDK which contains the sample projects, along side the open source Tools and Demo libraries.
In the Welcome to Android Studio window, click Import project (Gradle, Eclipse ADT, etc.).
Select the project folder containing the
settings.gradle file and click OK.
Run the project.
Get the answers you need: Support