Android版本检测升级

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我们应该都有类似的使用体验，当一款APP需要更新是，进入界面会提醒有新的更新是否更新，这里有那么几个步骤

1、首先检测当前版本

2、判断服务器中版本

3、如果有更新则点击更新，下载安装包，下载完成后自动安装

具体代码怎么实现呢？下面我们一起看一下

/*

 * 获取当前程序的版本号

 */

privateString getVersionName() throwsException{

    //获取packagemanager的实例

    PackageManager packageManager = getPackageManager();

    //getPackageName()是你当前类的包名，0代表是获取版本信息

    PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0);

    returnpackInfo.versionName;

}

读取服务器版本号

/*

 * 用pull解析器解析服务器返回的xml文件 (xml封装了版本号)

 */

publicstatic UpdataInfo getUpdataInfo(InputStream is) throwsException{

    XmlPullParser  parser = Xml.newPullParser();

    parser.setInput(is, "utf-8");//设置解析的数据源

    inttype = parser.getEventType();

    UpdataInfo info = newUpdataInfo();//实体

    while(type != XmlPullParser.END_DOCUMENT ){

        switch(type) {

        caseXmlPullParser.START_TAG:

            if("version".equals(parser.getName())){

                info.setVersion(parser.nextText()); //获取版本号

            }elseif ("url".equals(parser.getName())){

                info.setUrl(parser.nextText()); //获取要升级的APK文件

            }elseif ("description".equals(parser.getName())){

                info.setDescription(parser.nextText()); //获取该文件的信息

            }

            break;

        }

        type = parser.next();

    }

    returninfo;

}

下载

publicstatic File getFileFromServer(String path, ProgressDialog pd) throwsException{

    //如果相等的话表示当前的sdcard挂载在手机上并且是可用的

    if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){

        URL url = newURL(path);

        HttpURLConnection conn =  (HttpURLConnection) url.openConnection();

        conn.setConnectTimeout(5000);

        //获取到文件的大小

        pd.setMax(conn.getContentLength());

        InputStream is = conn.getInputStream();

        File file = newFile(Environment.getExternalStorageDirectory(), "updata.apk");

        FileOutputStream fos = newFileOutputStream(file);

        BufferedInputStream bis = newBufferedInputStream(is);

        byte[] buffer = newbyte[1024];

        intlen ;

        inttotal=0;

        while((len =bis.read(buffer))!=-1){

            fos.write(buffer, 0, len);

            total+= len;

            //获取当前下载量

            pd.setProgress(total);

        }

        fos.close();

        bis.close();

        is.close();

        returnfile;

    }

    else{

        returnnull;

    }

}

版本匹配、自动安装

/*

 * 从服务器获取xml解析并进行比对版本号

 */

publicclass CheckVersionTask implementsRunnable{

 

    publicvoid run() {

        try{

            //从资源文件获取服务器 地址

            String path = getResources().getString(R.string.serverurl);

            //包装成url的对象

            URL url = newURL(path);

            HttpURLConnection conn =  (HttpURLConnection) url.openConnection();

            conn.setConnectTimeout(5000);

            InputStream is =conn.getInputStream();

            info =  UpdataInfoParser.getUpdataInfo(is);

 

            if(info.getVersion().equals(versionname)){

                Log.i(TAG,"版本号相同无需升级");

                LoginMain();

            }else{

                Log.i(TAG,"版本号不同 ,提示用户升级 ");

                Message msg = newMessage();

                msg.what = UPDATA_CLIENT;

                handler.sendMessage(msg);

            }

        } catch(Exception e) {

            // 待处理

            Message msg = newMessage();

            msg.what = GET_UNDATAINFO_ERROR;

            handler.sendMessage(msg);

            e.printStackTrace();

        }

    }

}

 

Handler handler = newHandler(){

 

    @Override

    publicvoid handleMessage(Message msg) {

        // TODO Auto-generated method stub

        super.handleMessage(msg);

        switch(msg.what) {

        caseUPDATA_CLIENT:

            //对话框通知用户升级程序

            showUpdataDialog();

            break;

        caseGET_UNDATAINFO_ERROR:

            //服务器超时

            Toast.makeText(getApplicationContext(), "获取服务器更新信息失败", 1).show();

            LoginMain();

            break;

        caseDOWN_ERROR:

            //下载apk失败

            Toast.makeText(getApplicationContext(), "下载新版本失败", 1).show();

            LoginMain();

            break;

        }

    }

};

 

/*

 *

 * 弹出对话框通知用户更新程序

 *

 * 弹出对话框的步骤：

 *  1.创建alertDialog的builder.

 *  2.要给builder设置属性, 对话框的内容,样式,按钮

 *  3.通过builder 创建一个对话框

 *  4.对话框show()出来

 */

protectedvoid showUpdataDialog() {

    AlertDialog.Builder builer = newBuilder(this) ;

    builer.setTitle("版本升级");

    builer.setMessage(info.getDescription());

    //当点确定按钮时从服务器上下载 新的apk 然后安装

    builer.setPositiveButton("确定", newOnClickListener() {

    publicvoid onClick(DialogInterface dialog, intwhich) {

            Log.i(TAG,"下载apk,更新");

            downLoadApk();

        }

    });

    //当点取消按钮时进行登录

    builer.setNegativeButton("取消", newOnClickListener() {

        publicvoid onClick(DialogInterface dialog, intwhich) {

            // TODO Auto-generated method stub

            LoginMain();

        }

    });

    AlertDialog dialog = builer.create();

    dialog.show();

}

 

/*

 * 从服务器中下载APK

 */

protectedvoid downLoadApk() {

    finalProgressDialog pd;    //进度条对话框

    pd = new ProgressDialog(this);

    pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

    pd.setMessage("正在下载更新");

    pd.show();

    newThread(){

        @Override

        publicvoid run() {

            try{

                File file = DownLoadManager.getFileFromServer(info.getUrl(), pd);

                sleep(3000);

                installApk(file);

                pd.dismiss(); //结束掉进度条对话框

            } catch(Exception e) {

                Message msg = newMessage();

                msg.what = DOWN_ERROR;

                handler.sendMessage(msg);

                e.printStackTrace();

            }

        }}.start();

}

 

//安装apk

protectedvoid installApk(File file) {

    Intent intent = newIntent();

    //执行动作

    intent.setAction(Intent.ACTION_VIEW);

    //执行的数据类型

    intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");

    startActivity(intent);

}

 

/*

 * 进入程序的主界面

 */

privatevoid LoginMain(){

    Intent intent = newIntent(this,MainActivity.class);

    startActivity(intent);

    //结束掉当前的activity

    this.finish();

}

相关类

publicclass UpdataInfo {

    privateString version;

    privateString url;

    privateString description;

    publicString getVersion() {

        returnversion;

    }

    publicvoid setVersion(String version) {

        this.version = version;

    }

    publicString getUrl() {

        returnurl;

    }

    publicvoid setUrl(String url) {

        this.url = url;

    }

    publicString getDescription() {

        returndescription;

    }

    publicvoid setDescription(String description) {

        this.description = description;

    }

}

相关布局

<?xmlversion="1.0"encoding="utf-8"?>

<info>

    <version&gt;2.0&lt;/version>

    <url>http://192.168.0.64:8080/mobilesafe.apk</url>

    <description>检测到最新版本，请及时更新！</description>

</info>