Hello World Kindlet

This is an example Kindlet written for the Kindle 4 NT. It only contains a text area. It can be used to test a development environment.

Requirements

If using the signJar task, put developer.keystore in the root of the project. This is not necessary when signing through other means, such as the command line. The signJar task assumes the developer.keystore is the shared developer keystore.

For compilation, Kindlet-1.3.jar needs to be placed in the libs directory. Kindlet-1.3.jar is part of the KDK for the Kindle 4 NT. If you have access to the root filesystem (for instance, via SSH), you can find it in /opt/amazon/ebook/lib. This is not included in the repository.

Compilation

Use the jar gradle task to compile the project into a jar file. The Kindle will refuse to open the Kindlet unless you sign the resulting jar, which you can do with the signJar task. These tasks will generate warnings because of the use of legacy Java versions and insecure signing algorithms, but the use of these old versions are necessary because the Kindle itself uses these old versions and algorithms.

Installation

Once you have a signed jar, you can place it in /mnt/us/documents on the Kindle with the azw2 extension instead of jar. In USB Drive Mode, you can simply place it in the documents folder on the Kindle. The Kindlet will appear on the home page, denoted with the dev tag.