关于版本更新

//获取服务器版本号

  HttpUtils utils_ver = new HttpUtils();
        utils_ver.send(HttpMethod.GET, Net_URL.VER_SION, new RequestCallBack<String>() {
            @Override
            public void onSuccess(ResponseInfo<String> responseInfo) {
                String result_ver = responseInfo.result;

                Gson g = new Gson();
                Vis_Big json = g.fromJson(result_ver, Vis_Big.class);
                list_v = json.getVersion();

                //判断更新
                update();
            }

            @Override
            public void onFailure(HttpException e, String s) {

                Toast.makeText(HomeActivity.this, "请检查网络连接", Toast.LENGTH_LONG).show();

            }
        });

//判断更新

 try {
            PackageManager manager = this.getPackageManager();
            PackageInfo info = manager.getPackageInfo(this.getPackageName(), 0);
            String version = info.versionName;
            System.out.println("版本号" + version + list_v.getVersion());
            if (version != list_v.getVersion()) {
                System.out.println("=========" + list_v.getVersion());
                initAlert();
            } else {
                Toast.makeText(getApplicationContext(), "要更新了", Toast.LENGTH_LONG).show();
            }
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

//自定义dialog

 try {
            Toast.makeText(getApplicationContext(), "更新给糖吃", Toast.LENGTH_LONG).show();
            AlertDialog.Builder builder = new AlertDialog.Builder(HomeActivity.this);
            builder.setTitle("亲！  快来更新啦");
            builder.setMessage("当前版本号为" + list_v.getVersion());
            builder.setPositiveButton("立即更新",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // 点击立即下载更新包
                            downLoadApk();
                        }
                    });
            builder.setNegativeButton("狠心丑拒",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    });

            AlertDialog alertDialog = builder.create();
            alertDialog.show();
        } catch (Exception e) {
            e.printStackTrace();
        }

//进行下载

public class DownLoadManager {

public static File getFileFromServer(String path, ProgressDialog pd) throws Exception{

        //濡傛灉鐩哥瓑鐨勮瘽琛ㄧず褰撳墠鐨剆dcard鎸傝浇鍦ㄦ墜鏈轰笂骞朵笖鏄�彲鐢ㄧ殑

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

            URL url = new URL(path);

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

            conn.setConnectTimeout(5000);

            //鑾峰彇鍒版枃浠剁殑澶у皬

            pd.setMax(conn.getContentLength());

            InputStream is = conn.getInputStream();

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

            FileOutputStream fos = new FileOutputStream(file);

            BufferedInputStream bis = new BufferedInputStream(is);

            byte[] buffer = new byte[1024];

            int len ;

            int total=0;

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

                fos.write(buffer, 0, len);

                total+= len;

                //鑾峰彇褰撳墠涓嬭浇閲�

                pd.setProgress(total);

            }

            fos.close();

            bis.close();

            is.close();

            return file;

        }

        else{

            return null;

        }

    }

}

//下载进度框

 final ProgressDialog pd; // 进度条对话框

        pd = new ProgressDialog(HomeActivity.this);

        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

        pd.setMessage("正在下载更新");

        pd.show();
        // 进行下载操作
        new Thread() {

            @Override
            public void run() {

                try {
                    // 下载
                    File file = DownLoadManager.getFileFromServer(
                            list_v.getUrl(), pd);

                    sleep(3000);
                    // 安装
                    installApk(file);

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

                } catch (Exception e) {

                }

            }


        }.start();

//跳转安装

 Intent intent = new Intent();

        // 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");

        HomeActivity.this.startActivity(intent);