(After the source code is decompressed and imported, it can be directly run on the simulator with only one Activity130 lines of code, which is very simple and easy to understand. In this way, you can't learn how to generate QR code and nobody can save you. The parsing function has been commented out. You can uncomment the learning. You can enter any field in the simulator and click to generate the QR code book. The following attachments are included:)