从 android 应用向 MySQL 插入数据

Question

我打算为 android 开发一个网络应用程序，但我是第一次尝试这个实验，所以我无法完成我的任务，因为我是新手。它给我一个错误，如字符串无法转换为 JSONObject。请帮助我，我已经尝试了一切，但还没有找到任何解决方案。这是我的代码。

public class signup extends Activity implements OnClickListener {
Button signup,cancel;
EditText e1,e2,e3,e4;

String name;
String email;
String  mobile;
String passwd;
InputStream is=null;
String result=null;
String line=null;
int code;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.signupfrag);

    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }

    signup=(Button)findViewById(R.id.reg);
    cancel=(Button)findViewById(R.id.regcancel);

    e1=(EditText)findViewById(R.id.name);
    e2=(EditText)findViewById(R.id.uid);
    e3=(EditText)findViewById(R.id.contact);
    e4=(EditText)findViewById(R.id.passwd); 

    signup.setOnClickListener(this);
    cancel.setOnClickListener(this);
}
public void onClick(View v) {
    // TODO Auto-generated method stub
    if(v.getId()==R.id.reg)
    {
        name = e1.getText().toString();
        email = e2.getText().toString();
        mobile = e3.getText().toString();
        passwd = e4.getText().toString();

        insert();
      Intent i=new Intent(signup.this,MainActivity.class);
      startActivity(i);
    }

    if(v.getId()==R.id.regcancel)
    {
      e1.setText(null);
      e2.setText(null);
      e3.setText(null);
      e4.setText(null);
    }
}
private void insert() {
    // TODO Auto-generated method stub
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();


    nameValuePairs.add(new BasicNameValuePair("fname",name));
    nameValuePairs.add(new BasicNameValuePair("email",email));
    nameValuePairs.add(new BasicNameValuePair("mobile",mobile));
    nameValuePairs.add(new BasicNameValuePair("passwd",passwd));

        try
        {
        HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://192.168.43.73/htdocs/insert1.php");//10.0.2.2
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = httpclient.execute(httppost); 
            HttpEntity entity = response.getEntity();
            is = entity.getContent();
            Log.e("pass 1", "connection success ");
    }
        catch(Exception e)
    {
            Log.e("Fail 1", e.toString());
            Toast.makeText(getApplicationContext(), "Invalid IP Address",
            Toast.LENGTH_LONG).show();
    }     

        try
        {
            BufferedReader reader = new BufferedReader
            (new InputStreamReader(is,"iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            while ((line = reader.readLine()) != null)
        {
                sb.append(line + "\n");
            }
            is.close();
            result = sb.toString();
        Log.e("pass 2", "connection success ");
    }
        catch(Exception e)
    {
            Log.e("Fail 2", e.toString());
    }     

    try
    {
            JSONObject json_data = new JSONObject(result);
            code=(json_data.getInt("code"));

            if(code==1)
            {
        Toast.makeText(getBaseContext(), "Inserted Successfully",
            Toast.LENGTH_SHORT).show();
            }
            else
            {
         Toast.makeText(getBaseContext(), "Sorry, Try Again",
            Toast.LENGTH_LONG).show();
            }
    }
    catch(Exception e)
    {
        Log.e("log_tag", "Error parsing data "+e.toString());
        Log.e("log_tag", "Failed data was:\n" + result);
            Log.e("Fail 3", e.toString());
    }       
  }
}

这是我的 php 代码

<?php
$host='127.0.0.1';
$uname='root';
$pwd='password';
$db="resumemaker";


$con = mysql_connect("localhost", "root");
mysql_select_db($db,$con) or die("db selection failed");

$fname=$_REQUEST['fname'];
$email=$_REQUEST['email'];
$mobile=$_REQUEST['mobile'];
$passwd=$_REQUEST['passwd'];



$flag['code']=0;

if($r=mysql_query("insert into sample values('$fname','$email','$mobile','$passwd') ",$con))
{
    $flag['code']=1;
    //echo"hi";
}

print(json_encode($flag));
mysql_close($con);
?>

提前致谢....

Answer 1

你没有将它编码成 json 看这个例子将帮助你 100% 的工作代码

Index.php

<?php

   header("Content-Type:application/json");

   include("function.php");

$fname=$_REQUEST['fname'];
$email=$_REQUEST['email'];
$mobile=$_REQUEST['mobile'];
$passwd=$_REQUEST['passwd'];

 $record = fetchrecord($fname,$email,$mobile,$passwd);


         if(empty($record))
         {
           deliverresponse(200,"Record not found",NULL,0);  
         }
         else
         {
           deliverresponse(200,"Record Displayed",$record,1);   
         }


   function deliverresponse($status,$status_message,$data,$success)
   {
         header("HTTP/1.1 $status $status_message");
         $response['status'] = $status;
         $response['status_message'] = $status_message;
          $response['code'] = $code;
          $response['data'] = $data;
          $jsonresponse = json_encode($response);
          echo $jsonresponse;

   }
?>

Function.php

<?php
        $conn = mysql_connect("localhost", "root", "");

        mysql_select_db('your db name', $conn);

  function fetchrecord($fname,$email,$mobile,$passwd)
  {


     $qur = mysql_query("INSERT INTO `sample` (fname,email,mobile,passwd) VALUES (NULL, '$fname','$email','$mobile','$passwd')") or die ("Query Failed");

     if($qur)
     {
        $msg = "Record Inserted";   

        $user[] = array($msg); 

     }
     else
     {
       $msg = "Record not Inserted";   

        $user[] = array($msg);   
     }
        return $user;

  }

为网络线程使用异步 Class

 public class SignupProcess extends  AsyncTask<String, String, String>

    {
        JSONObject json = new JSONObject();
   private static final String TAG_SUCCESS = "code";
        @Override
        protected void onPreExecute() {

            pDialog = new ProgressDialog(signup.this);
            pDialog.setMessage("Login..");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();

            super.onPreExecute();
        }

        @Override
        protected String doInBackground(String... args) {




            List<NameValuePair> pair = new ArrayList<>();
            pair.add(new BasicNameValuePair("name", name));
            pair.add(new BasicNameValuePair("email", email));
            pair.add(new BasicNameValuePair("password", mobile));
            pair.add(new BasicNameValuePair("status",String,psswd);


            json = JSONParser.makeHttpRequest("http://xxxxxxx","GET", pair);

            Log.d("Create Response", json.toString());

            try {

                int success = json.getInt(TAG_SUCCESS);
                getstatus = success;
                if (success == 1) {

                    Log.d("success!", json.toString());

                }

                else if (success==0){


                    return json.getString(TAG_SUCCESS);

                }


            } catch (JSONException e) {
                e.printStackTrace();
            }
            return null;
        }

JSONParser.java

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";
    public static String Result=null;

    public JSONParser()
    {

    }

    public static JSONObject makeHttpRequest(String url,String method, List<NameValuePair>  pair) {

        try {

            // check for request method
            if(method.equals("POST")){
                // request method is POST
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(pair));

                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();

            }else if(method.equals("GET")){
                // request method is GET
                DefaultHttpClient httpClient = new DefaultHttpClient();
                String paramString = URLEncodedUtils.format(pair, "utf-8");
                url += "?" + paramString;
                HttpGet httpGet = new HttpGet(url);

                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            }

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, HTTP.UTF_8), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
            Result = json;
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        return jObj;
    }


}

在按钮点击侦听器上写入

new SignupProcess().execute();

从 android 应用向 MySQL 插入数据

inserting data into MySQL from android app

php

mysql

android

json

jsonobject