Morse Mentor provides an easy way to learn Morse Code using the Koch Method. Start by listening to 2 characters and enter what you hear. If you obtained a 90% overall accuracy then you can move on to 3 characters and repeat the process.
Get the .apk installation package of Morse Mentor 1.6 that is provided for free and check out users' reviews on Droid Informer. The file size is 2 MB and the app is designed for Android 4.0 and higher. The antivirus report demonstrates that this application is completely safe. Smoky Ink has developed the tool that falls into the Educational category.