(This video tutorial is a combination of the introductory part and the practical part. The introductory part is a video tutorial that you can collect online feedback and is suitable for scholars to learn by themselves. You can choose a single tutorial for your own style. The practical part is a video tutorial that gathers explanations of various practical projects. You can choose your favorite projects to practice. This resource will be updated from time to time, regardless of the rank. The download address of Android development source code can be found later. Welcome to download!)