Как отправить строку с Android на php

Question

Я пытался создать онлайн-приложения. Я хотел бы отправить строку из моих приложений на свой PHP-скрипт, но в итоге php не получил ни одной строки из моих приложений, а это означает, что PhP вернет NULL. Я проводил исследования в Интернете и искал решение, но никто из них не работал.

Ниже мой MainActivity.java код:

package my.com.tutionathome.calvinlau.testserver; 

import java.util.ArrayList; 
import java.util.List; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.ResponseHandler; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.BasicResponseHandler; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 
import android.app.Activity; 
import android.app.ProgressDialog; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 

public class MainActivity extends Activity { 
    Button b; 
    EditText et; 
    TextView tv; 
    HttpPost httppost; 
    StringBuffer buffer; 
    HttpResponse response; 
    HttpClient httpclient; 
    List<NameValuePair> nameValuePairs; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     b = (Button)findViewById(R.id.Button01); 
     et= (EditText)findViewById(R.id.EditText01); 
     tv= (TextView)findViewById(R.id.tv); 

     b.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       final ProgressDialog p = new ProgressDialog(v.getContext()).show(v.getContext(),"Waiting for Server", "Accessing Server"); 
       Thread thread = new Thread() 
       { 
        @Override 
        public void run() { 
         try{ 

          httpclient=new DefaultHttpClient(); 
          httppost= new   HttpPost("http://10.0.0.2/my_folder_inside_htdocs/connection.php"); // make sure the url is correct. 
          //add your data 
          nameValuePairs = new ArrayList<NameValuePair>(1); 
          // Always use the same variable name for posting i.e the android side variable name and php side variable name should be similar, 
          nameValuePairs.add(new BasicNameValuePair("username",et.getText().toString().trim())); // $"username" = $_POST['username']; 
          httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
          //Execute HTTP Post Request 
          response=httpclient.execute(httppost); 

          ResponseHandler<String> responseHandler = new BasicResponseHandler(); 
          final String response = httpclient.execute(httppost, responseHandler); 
          System.out.println("Response : " + response); 
          runOnUiThread(new Runnable() { 
           public void run() { 
            p.dismiss(); 
            tv.setText("Response from PHP : " + response); 
           } 
          }); 

         }catch(Exception e){ 

          runOnUiThread(new Runnable() { 
           public void run() { 
            p.dismiss(); 
           } 
          }); 
          System.out.println("Exception : " + e.getMessage()); 
         } 
        } 
       }; 

       thread.start(); 


      } 
     }); 
    } 
} 

И мой PHP код:

<?php 
     // put your code here 
     $hostname_localhost ="localhost"; 
    $database_localhost ="android"; 
    $username_localhost ="root"; 
    $password_localhost =""; 
    $localhost = mysql_connect($hostname_localhost,$username_localhost,$password_localhost) 
    or 
    trigger_error(mysql_error(),E_USER_ERROR); 

    mysql_select_db($database_localhost, $localhost); 

    $username = $_POST['username']; 
    $password = $_POST['password']; 
    $query_search = "select Email, Username from tblmember where Username = '".$username."' AND Email = '".$password. "'"; 
    $query_exec = mysql_query($query_search) or die(mysql_error()); 
    $rows = mysql_num_rows($query_exec); 

    if($username == NULL){ 
     echo "NULL"; 
    }else{ 
     echo $username; 
    } 
     ?> 

Это мой Android Manifest:

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="my.com.tutionathome.calvinlau.testserver"> 
    <uses-permission android:name="android.permission.INTERNET"/> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 

</manifest> 

Answer 1

Есть куча библиотек для облегчения этого, экономя много строк кода, я особенно рекомендую retrofit.

Answer 2

Пробуйте этот код.

AysncyTask

private class AysncyTask extends AsyncTask<Void,Void,Void> 
    { 
     private ProgressDialog regDialog=null; 
     @Override 
     protected void onPreExecute() 
     { 
      super.onPreExecute(); 
      regDialog=new ProgressDialog(this); 
      regDialog.setTitle(getResources().getString(R.string.app_name)); 
      regDialog.setMessage(getResources().getString(R.string.app_pleasewait)); 
      regDialog.setIndeterminate(true); 
      regDialog.setCancelable(true); 
      regDialog.show(); 
     }  
     @Override 
     protected Void doInBackground(Void... params) { 
      try 
      { 
       new Thread(new Runnable() { 
        @Override 
        public void run() { 
         ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>(); 



         postParameters.add(new BasicNameValuePair("username", 
           et.getText().toString().trim())); 

    postParameters.add(new BasicNameValuePair("password", 
           etpass.getText().toString().trim())); 





         String response = null; 
         try { 
          response = SimpleHttpClient 
            .executeHttpPost("http://10.0.0.2/my_folder_inside_htdocs/connection.php", 
              postParameters); 
          res = response.toString(); 

          return res; 

         } catch (Exception e) { 
          e.printStackTrace(); 
          errorMsg = e.getMessage(); 
         } 
        } 
       }).start(); 
       try { 
        Thread.sleep(3000); 


       // error.setText(resp); 
        if (null != errorMsg && !errorMsg.isEmpty()) { 

        } 
       } catch (Exception e) { 
       } 

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

     @Override 
     protected void onPostExecute(Void result) 
     { 
      super.onPostExecute(result); 
      if(regDialog!=null) 
      { 

       regDialog.dismiss(); 

      //do you code here you want 

       } 

    // do what u do 
    } 

SimpleHttpClient.java

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.URI; 
import java.util.ArrayList; 

import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.conn.params.ConnManagerParams; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.params.HttpConnectionParams; 
import org.apache.http.params.HttpParams; 

public class SimpleHttpClient { 
/** The time it takes for our client to timeout */ 
    public static final int HTTP_TIMEOUT = 30 * 1000; // milliseconds 

    /** Single instance of our HttpClient */ 
    private static HttpClient mHttpClient; 

    /** 
    * Get our single instance of our HttpClient object. 
    * 
    * @return an HttpClient object with connection parameters set 
    */ 
    private static HttpClient getHttpClient() { 
    if (mHttpClient == null) { 
     mHttpClient = new DefaultHttpClient(); 
     final HttpParams params = mHttpClient.getParams(); 
     HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT); 
     HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT); 
     ConnManagerParams.setTimeout(params, HTTP_TIMEOUT); 
    } 
    return mHttpClient; 
    } 

    public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception { 
    BufferedReader in = null; 
    try { 
     HttpClient client = getHttpClient(); 
     HttpPost request = new HttpPost(url); 
     UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters); 
     request.setEntity(formEntity); 
     HttpResponse response = client.execute(request); 
     in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); 

     StringBuffer sb = new StringBuffer(""); 
     String line = ""; 
     String NL = System.getProperty("line.separator"); 
     while ((line = in.readLine()) != null) { 
     sb.append(line + NL); 
     } 
     in.close(); 

     String result = sb.toString(); 
     return result; 
    } 
    finally { 
     if (in != null) { 
     try { 
      in.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     } 
    } 
    } 


    public static String executeHttpatch(String url, ArrayList<NameValuePair> postParameters) throws Exception { 
    BufferedReader in = null; 
    try { 
     HttpClient client = getHttpClient(); 
     HttpPost request = new HttpPost(url); 
     UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters); 
     request.setEntity(formEntity); 
     HttpResponse response = client.execute(request); 
     in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); 

     StringBuffer sb = new StringBuffer(""); 
     String line = ""; 
     String NL = System.getProperty("line.separator"); 
     while ((line = in.readLine()) != null) { 
     sb.append(line + NL); 
     } 
     in.close(); 

     String result = sb.toString(); 
     return result; 
    } 
    finally { 
     if (in != null) { 
     try { 
      in.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     } 
    } 
    } 

    /** 
    * Performs an HTTP GET request to the specified url. 
    * 
    * @param url The web address to post the request to 
    * @return The result of the request 
    * @throws Exception 
    */ 
    public static String executeHttpGet(String url) throws Exception { 
    BufferedReader in = null; 
    try { 
     HttpClient client = getHttpClient(); 
     HttpGet request = new HttpGet(); 
     request.setURI(new URI(url)); 
     HttpResponse response = client.execute(request); 
     in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); 

     StringBuffer sb = new StringBuffer(""); 
     String line = ""; 
     String NL = System.getProperty("line.separator"); 
     while ((line = in.readLine()) != null) { 
     sb.append(line + NL); 
     } 
     in.close(); 

     String result = sb.toString(); 
     return result; 
    } 
    finally { 
     if (in != null) { 
     try { 
      in.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     } 
    } 
    } 
}