没有wifi连接，Android应用无法正常工作

Question

我有一个小型的android应用程序，它使用MySQL（通过php网站）将数据插入表中。 当我使用wifi时，一切正常，但是当我禁用wifi时，数据不存储在数据库中。 这是我用来连接到本地php文件的代码：

 protected String doInBackground(Void... params) {
        String url = "http://192.168.1.2:6969/android/index.php";

        try {
            URL address = new URL(url);
            HttpURLConnection httpURLConnection = (HttpURLConnection) address.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            OutputStream outputStream = httpURLConnection.getOutputStream();
            BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
            String postData = URLEncoder.encode("name", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8") + "&"
                    + URLEncoder.encode("emailAddress", "UTF-8") + "=" + URLEncoder.encode(emailAddress, "UTF-8");
            bufferedWriter.write(postData);
            bufferedWriter.flush();
            bufferedWriter.close();
            outputStream.close();
            InputStream inputStream = httpURLConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
            String line;
            while((line = bufferedReader.readLine())!=null) {
                result += line;
            }
            bufferedReader.close();
            inputStream.close();
            httpURLConnection.disconnect();

            return result;
        } catch (IOException e) {
        }

        return null;
    }

我发现问题出在行上：

OutputStream outputStream = httpURLConnection.getOutputStream();

我的应用程序到此为止。

有没有办法强制此应用程序在没有wifi连接的情况下工作？

当我在Android手机上以调试USB模式启动应用程序时，这是logcat：

E/GED: Failed to get GED Log Buf, err(0)
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
 D/libc-netbsd: [getaddrinfo]: mtk netid=0; mark=0
 D/libc-netbsd: getaddrinfo( app_uid:10226
 D/libc-netbsd: getaddrinfo() uid prop:
 D/libc-netbsd: getaddrinfo() getuid():10226
 D/libc-netbsd: [getaddrinfo]: mtk ai_addrlen=0; ai_canonname=(null); ai_flags=4; ai_family=0
 D/libc-netbsd: [getaddrinfo]: mtk netid=0; mark=0
 D/libc-netbsd: getaddrinfo( app_uid:10226
 D/libc-netbsd: getaddrinfo() uid prop:
 D/libc-netbsd: getaddrinfo() getuid():10226
 D/libc-netbsd: [getaddrinfo]: mtk ai_addrlen=0; ai_canonname=(null); ai_flags=4; ai_family=0

Answer 1

我建议您使用一个可以为您处理所有内容的库。

像http://square.github.io/okhttp/

这是一个示例代码，它如何处理URL编码的请求：

 RequestBody formBody = new FormBody.Builder()
            .add("name", "name")
            .add("emailAdress", "xxx@xxx.com")
            .build();

    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
            .url(url)
            .post(formBody)
            .build();

    Response response = client.newCall(request).execute();
    return response.body().string();

更重要的是。 您有一个192.168.xx IP地址。 这是用于专用网络，是无法通过公共互联网。 如果您知道路由器的公共IP，则可以转发到PC，但我不建议您这样做。