Android 软件自动更新功能实现的方法

相信所有的用户都遇到过软件提醒更新的情况，下面就将实现此功能

首先看一下程序目录结构

步骤:

1、新建一个类updatemanger，用于显示提示更新

复制代码代码如下:

public class updatemanger {
// 应用程序context
private context mcontext;
// 提示消息
private string updatemsg = "有最新的软件包，请下载！";
// 下载安装包的网络路径
private string apkurl = "http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk";
private dialog noticedialog;// 提示有软件更新的对话框
private dialog downloaddialog;// 下载对话框
private static final string savepath = "/sdcard/updatedemo/";// 保存apk的文件夹
private static final string savefilename = savepath + "updatedemorelease.apk";
// 进度条与通知ui刷新的handler和msg常量
private progressbar mprogress;
private static final int down_update = 1;
private static final int down_over = 2;

private int progress;// 当前进度 private thread downloadthread; // 下载线程 private boolean interceptflag = false;// 用户取消下载 // 通知处理刷新界面的handler private handler mhandler = new handler() { @suppresslint("handlerleak") @override public void handlemessage(message msg) { switch (msg.what) { case down_update: mprogress.setprogress(progress); break; case down_over: installapk(); break; } super.handlemessage(msg); } }; public updatemanger(context context) { this.mcontext = context; } // 显示更新程序对话框，供主程序调用 public void checkupdateinfo() { shownoticedialog(); } private void shownoticedialog() { android.app.alertdialog.builder builder = new android.app.alertdialog.builder( mcontext);// builder，可以通过此builder设置改变aleartdialog的默认的主题样式及属性相关信息 builder.settitle("软件版本更新"); builder.setmessage(updatemsg); builder.setpositivebutton("下载", new onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { dialog.dismiss();// 当取消对话框后进行操作一定的代码？取消对话框 showdownloaddialog(); } }); builder.setnegativebutton("以后再说", new onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { dialog.dismiss(); } }); noticedialog = builder.create(); noticedialog.show(); } protected void showdownloaddialog() { android.app.alertdialog.builder builder = new android.app.alertdialog.builder(mcontext); builder.settitle("软件版本更新"); final layoutinflater inflater = layoutinflater.from(mcontext); view v = inflater.inflate(r.layout.progress, null); mprogress = (progressbar) v.findviewbyid(r.id.progress); builder.setview(v);// 设置对话框的内容为一个view builder.setnegativebutton("取消", new onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { dialog.dismiss(); interceptflag = true; } }); downloaddialog = builder.create(); downloaddialog.show(); downloadapk(); } private void downloadapk() { downloadthread = new thread(mdownapkrunnable); downloadthread.start(); } protected void installapk() { file apkfile = new file(savefilename); if (!apkfile.exists()) { return; } intent i = new intent(intent.action_view); i.setdataandtype(uri.parse("file://" + apkfile.tostring()), "application/vnd.android.package-archive");// file.tostring()会返回路径信息 mcontext.startactivity(i); } private runnable mdownapkrunnable = new runnable() { @override public void run() { url url; try { url = new url(apkurl); httpurlconnection conn = (httpurlconnection) url.openconnection(); conn.connect(); int length = conn.getcontentlength(); inputstream ins = conn.getinputstream(); file file = new file(savepath); if (!file.exists()) { file.mkdir(); } string apkfile = savefilename; file apkfile = new file(apkfile); fileoutputstream outstream = new fileoutputstream(apkfile); int count = 0; byte buf[] = new byte[1024]; do { int numread = ins.read(buf); count += numread; progress = (int) (((float) count / length) * 100); // 下载进度 mhandler.sendemptymessage(down_update); if (numread <= 0) { // 下载完成通知安装 mhandler.sendemptymessage(down_over); break; } outstream.write(buf, 0, numread); } while (!interceptflag);// 点击取消停止下载 outstream.close(); ins.close(); } catch (exception e) { e.printstacktrace(); } } }; }

2、新建一个xml文件，用于定义下载过程中的progressbar的进度显示，名为progress.xml

复制代码代码如下:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >

</linearlayout>

3、在mainactivity中oncreate()方法中，进行软件更新的检测

mupdatemanger = new updatemanger(mainactivity.this);// 注意此处不能传入getapplicationcontext();会报错，因为只有是一个activity才可以添加窗体
mupdatemanger.checkupdateinfo();

并且在配置清单文件中添加网络权限 <uses-permission android:name="android.permission.internet" />

4、运行程序

Android 软件自动更新功能实现的方法 --点击下载-->