(Introduction: Publish the source code of the small query tool made by class netizens, mainly including knowledge points (function points) 1. Use "layering", including color, style, animation, text, ID, and scale (in fact, separating data and view) 2. HTTP solicitation, simple use of JSON 3. Use of the welcome interface, ListView, and menu 4. Use of the selector 5. Update and download (here, only after the solicitation interface finds a new version, the browser will be launched to open the APK location for download) 6 User defined navigation (hide the navigation bar that comes with the system, and then hard code a layout, especially looking at the framework). I hope it will be helpful for beginners================================================================================================ SmallTools.rar)