屏蔽HTTPS证书验证下载apk安装包

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当我们从一个HTTPS的网址下载资源时，不需要经过它的证书验证实现下载想要的资源

 private  void  DownApk(String url) throws MalformedURLException {        String urlStr=url;        try {

// 目前的证书基本都是ca签名验证,SSL验证。

            SSLContext sc =SSLContext.getInstance("TLS");            sc.init(null, new TrustManager[]{new MyTrustManager()}, new SecureRandom());// HttpsURLConnection 验证，不是 HttpURLConnection

 HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());            HttpsURLConnection.setDefaultHostnameVerifier(new MyHostnameVerifier());            HttpsURLConnection conn = (HttpsURLConnection)new URL(urlStr).openConnection();            conn.setDoOutput(true);            conn.setDoInput(true);

// 上面代码就可以做到屏蔽HTTPS的证书，从而实现通畅的下载资源。

 // 删除文件夹            File apkfile = new File("/sdcard/xxx.apk");            if (apkfile.exists()){                apkfile.delete();            }            final String fileName = "xxx.apk";            File tmpFile = new File("/sdcard/");            if (!tmpFile.exists()) {                tmpFile.mkdir();            }            downapkfile = new File("/sdcard/1jindianzi", fileName);            try {                downapkfile.createNewFile();            } catch (IOException e) {                e.printStackTrace();            }            InputStream is = conn.getInputStream();            //内容总长度            long contentlength  =  conn.getContentLength();            //已下载的长度            long loadedlength = 0;            System.out.println(contentlength+"");            FileOutputStream fileOutput= new FileOutputStream(downapkfile);            byte[] buf = new byte[1024];//分配byte            conn.connect();            double count = 0;            if (conn.getResponseCode() >= 400) {            } else {                while (count <= 100) {                    if (is != null) {                        int numRead = is.read(buf);                        if (numRead <= 0) {                            sendMessage(1,0);                            break;                        } else { // 设置进度                            fileOutput.write(buf, 0, numRead);                            loadedlength += numRead;                            int mprogress = (int) ((loadedlength*100)/contentlength);// 设置下载进度，更新//  设置通知发送消息给NOtifyManager进行更新（进度更新，状态更新），判断状态                            System.out.println("ppp" + mprogress);                            if(oldprocess <= mprogress-2 ){// 避免notifymanager ANR，每下载百分之2才进行通知一次                                oldprocess =mprogress;                                sendMessage(0, mprogress);                            }                        }                    } else {                        break;                    }                }            }            conn.disconnect();//记得关闭连接            fileOutput.close();            is.close();        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (KeyManagementException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }

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