【移动应用开发技术】Android应用升级检测更新下载检验安装

【移动应用开发技术】Android应用升级，检测更新，下载，检验，安装

应用升级大致步骤：检测是否有更新（读取服务器config文件，比对版本号）若发现高版本则读取更新文件updateinfo.xml获取下载更新相关信息校验信息确认升级后，下载apk下载完apk后，进行MD5检验apk的完整性安装apk升级入口 private

void

upgrade()

{

//需要访问网络，避免主线程堵塞

new

Thread(){

public

void

run()

{

if(checkUpdate()){//检查更新

handler.sendEmptyMessage(20);//通知界面提示有版本更新

}

};

}.start();

}

private

boolean

checkUpdate(){

String

url

=

PATH_SERVER

+

"upgrade/config";

//从config文件读取Version信息，和UpdateInfo.xml文件地址

try

{

updateInfoMap

=

ParseUpdateFile.getConfigInfo(url);

}

catch

(Exception

e)

{

e.printStackTrace();

}

//获取当前apk的版本号

PackageInfo

packageInfo

=

null;

try

{

packageInfo

=

MainActivity.this.getPackageManager().getPackageInfo(MainActivity.this.getPackageName(),

0);

}

catch

(Exception

e)

{

e.printStackTrace();

}

int

updateVCode

=

Integer.valueOf(updateInfoMap.get("Version"));

//服务器端apk版本高于现在的版本，则读取updateinfo.xml文件

if(updateVCode

>

packageInfo.versionCode){

url

=

PATH_SERVER+"upgrade/updateinfo.xml";

try

{

updateInfoMap.putAll(ParseXmlUtil.parseXml(url));

}

catch

(Exception

e)

{

e.printStackTrace();

}

//输出读取结果

Set<String>

set

=

updateInfoMap.keySet();

System.out.println("map.size():"+updateInfoMap.size());

for

(Iterator<String>

iterator

=

set.iterator();

iterator.hasNext();)

{

String

string

=

(String)

iterator.next();

System.out.println(string

+

"——>"

+

updateInfoMap.get(string));

}

//检查信息合法性，通过则发送可更新消息

return

checkUpdateInfo(updateInfoMap);

}

return

false;

}解析config文件 public

static

Map<String,String>

getConfigInfo(String

strURL)

throws

Exception

{

Map<String,String>

configMap

=

new

HashMap<String,

String>();

URL

url

=

new

URL(strURL);

URLConnection

conn

=

url.openConnection();

if

(conn

==

null)

{

return

configMap;

}

InputStream

inputStream

=

conn.getInputStream();

InputStreamReader

inputStreamReader

=

new

InputStreamReader(inputStream);

BufferedReader

bufferedReader

=

new

BufferedReader(inputStreamReader);

String

str

=

null;

while

(null

!=

(str=bufferedReader.readLine()))

{

if

(str

!=

null)

{

if

(str.contains("Version="))

{

configMap.put("Version",

str.substring(str.indexOf("=")+1));

}

if

(str.contains("VersionServer"))

{

configMap.put("VersionServer",

str.substring(str.indexOf("::")+2));

}

}

}

bufferedReader.close();

return

configMap;

}checkUpdateInfo（）主要校验信息的合法性 private

boolean

checkUpdateInfo(Map<String,

String>

updateInfoMap){

String

downloadPath

=

updateInfoMap.get("DownloadPath");

String

packageName

=

updateInfoMap.get("packageName");

String

versionCode

=

updateInfoMap.get("versionCode");

String

updateVCode

=

updateInfoMap.get("Version");

if

(checkUrl(downloadPath)//检测是否可访问

&&

versionCode.equals(updateVCode)//config和updateinfoxml文件中版本号是否一致

&&

packageName.equals(getPackageName()))

{//包名

return

true;

}

return

false;

}下载文件到设备需要权限<uses-permission

android:name="android.permission.WRITE_EXTERNAL_STORAGE"

/>

<uses-permission

android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> private

void

downLoadAPK(){

new

Thread()

{

public

void

run()

{

String

downLoadPath

=

updateInfoMap.get("DownloadPath");

String

downLoadDir

=

"/acfg/";

File

fileDir

=

new

File(downLoadDir);

if

(!fileDir.exists())

{

fileDir.mkdir();//创建文件夹

}

String

fileName

=

downLoadDir

+

downLoadPath.substring(downLoadPath.lastIndexOf("/")+1);

File

file

=

new

File(fileName);

if

(file.exists())

{

file.delete();//先删除之前已存在的文件

}

try

{

file.createNewFile();

URL

url

=

new

URL(downLoadPath);//

构造URL

URLConnection

con

=

url.openConnection();//

打开连接

int

contentLength

=

con.getContentLength();//

获得文件的长度

System.out.println("长度

:"

+

contentLength);

InputStream

is

=

con.getInputStream();//

输入流

byte[]

bs

=

new

byte[1024];//

1K的数据缓冲

int

len;//

读取到的数据长度

OutputStream

os

=

new

FileOutputStream(fileName);//

输出的文件流

//

开始读取

while

((len

=

is.read(bs))

!=

-1)

{

os.write(bs,

0,

len);

}

//

完毕，关闭所有链接

os.close();

is.close();

//保存文件路径，方便升级时使用

updateInfoMap.put("fileName",

fileName);

}

catch

(Exception

e)

{

e.printStackTrace();

handler.sendEmptyMessage(22);//下载失败

}

handler.sendEmptyMessage(21);//通知界面下载完成

};

}.start();

}下载完成后核对apk的MD5值File

file

=

new

File(fileName);

String

fileMD5

=

MD5Util.getMD5OfFile(file);

if

(fileMD5.equals(activity.updateInfoMap.get("md5sum")))

{

Toast.makeText(activity,

"Download

Finished.

It's

ready

to

update!",

Toast.LENGTH_LONG).show();

activity.update(fileName);

}获取文件的MD5值

public

static

String

getMD5OfFile(File

file)

{

String

value

=

null;

FileInputStream

in

=

null;

try

{

in

=

new

FileInputStream(file);

MappedByteBuffer

byteBuffer

=

in.getChannel().map(FileChannel.MapMode.READ_ONLY,

0,

file.length());

MessageDigest

md5

=

MessageDigest.getInstance("MD5");

md5.update(byteBuffer);

BigInteger

bi

=

new

BigInteger(1,

md5.digest());

value

=

bi.toString(16).toUpperCase(Locale.ENGLISH);//转为大写

}

catch

(Exception

e)

{

e.printStackTrace();

}

finally

{

if

(null

!=

in)

{

try

{

in.close();

}

catch

(IOException

e)

{

e.printStackTrace();

}

}

}

return

value;

}安装下载好的apk private

void

update(String

filePath)

{

Intent

i