需要帮助我的 android 应用程序（http 请求）在模拟器中工作，但不在物理 Galaxy S5 上

Posted 2023-05-07

【中文标题】需要帮助我的 android 应用程序（http 请求）在模拟器中工作，但不在物理 Galaxy S5 上

【英文标题】：Need help my android app (http request) is working in an emulator but not on a physical galaxy S5

【发布时间】：2020-09-21 13:09:55

【问题描述】：

该应用程序在 android studio 中使用模拟器和 xampp 服务器在同一台机器上运行，但是当我尝试在通过 USB 连接的 Galaxy S5 上运行它并在 sim 上使用我的数据包时，我在 logcat 中收到以下错误： (HTTPLog)-Static: isSBSettingEnabled false，据我所知，存在某种连接错误并且返回的数组是一个空集，这会导致应用程序崩溃。我尝试了以下连接网址，但没有一个有效：http://190.xxx.xx.xx/abcd/search.php、190.xxx.xx.xx/abcd/search.php、http://190.xxx.xx.xx:80/abcd/search.php、190.xxx.xx.xx:80/abcd/search.php

       protected String doInBackground(String... params) 
        String type = params[0];

        // Note Android reserved loopback address is 10.0.2.2
        // Testing server
        //String login_url = "http://10.0.2.2/ttsrp/search.php";
        // Live server
        String login_url = "http://190.xxx.xx.xx/abcd/search.php";
        Log.i("URL set:",login_url);

        if (type.equals("search"))
            try 
                Log.i("Branch :","Search String Accepted.");
                String search_key = params[1];
                //String password = params[2];
                URL url = new URL(login_url);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String post_data = URLEncoder.encode("search_key", "UTF-8")+"="+
                        URLEncoder.encode(search_key, "UTF-8");
                bufferedWriter.write(post_data);

                //Buffer Writer cleanup
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();

                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
                String result = "";
                String line = "";
                while((line = bufferedReader.readLine())!= null)
                bufferedReader.close();
                    result += line;
                
                inputStream.close();
                httpURLConnection.disconnect();
                Log.i("Information : ","Close Connection");
                return result;

             catch (MalformedURLException e) 
                Log.e("ERROR: ","Wrong or malformed URL.");
                e.printStackTrace();
             catch (IOException e) 
                e.printStackTrace();
            
        
        return null;
    

    @Override
    protected void onPostExecute(String result) 
        //alertDialog.setMessage(result);
        //alertDialog.show();

        ListView listView=(ListView)findViewById(R.id.fp_list);


        if (result==null)
            Log.e("ERROR : ", "Null Dataset returned.");
        else
            Log.d("Result:", result);
        


        JSONArray jarr = null;
        JSONObject jobj = null;
        try 
            jarr = new JSONArray(result);

            for (int i=0; i<(jarr.length()); i++)
                jobj = jarr.getJSONObject(i);

                int id = jobj.getInt("id");
                String off = jobj.getString("off");
                String act = jobj.getString("act");
                String ena = jobj.getString("ena");
                int fine = jobj.getInt("fine");
                int dem = jobj.getInt("dem");

                String lab = "acb " + act + " " + ena + " " +"123 " + dem;
                arrayList.add(lab);
                arrayList.add(off);
            
            //Create Adapter
            ArrayAdapter arrayAdapter=new ArrayAdapter(FixedPenalty.this,android.R.layout.simple_list_item_1, arrayList);
            //assign adapter to listview
            listView.setAdapter(arrayAdapter);
          catch (JSONException e) 
            e.printStackTrace();
        

【问题讨论】：

执行此操作时 Galaxy S5 是否与计算机连接到同一网络？

没有断开wifi

【参考方案1】：

我发现了问题，无线鼠标的电池电量不足导致此代码意外移动，过早关闭缓冲区读取器。

 while((line = bufferedReader.readLine())!= null)
            bufferedReader.close();
                result += line;
            

应该是

while((line = bufferedReader.readLine())!= null)
                    result += line;
                
bufferedReader.close();

仍然不知道为什么它仍然在模拟器中工作。