摘要： 1. 原理图2. 示例代码需要权限 activity_main.xml 布局文件 MainActivity.java public class MainActivity extends Activity { protected static final int DOWN_LOAD_ERROR = 1; protected static final int SERVER_ERROR = 2; public static final int DOWN_LAOD_FINSIH = 3; public static final int UPDATE_... 阅读全文