(Android uses 36 technology pdf traditional version of framework principle and program design. The book content is suitable for Android 1.0. Some friends may not be familiar with Android, right? I wonder if you have heard of the high-end mobile phones customized by Google in HTC? Its operating system is based on Android. If it is still unclear, you can Google the "HTCg2" mobile phone to roughly understand the interface and architecture features of the mobile operating system. In any case, Android phone programming is still primarily oriented to high-end and may be widespread in the future, so it is still necessary to master Android programming.)