Webln Webln - 7 months ago 17
PHP Question

Cannot process android post request to server and receive result back to android

I have research on this about how to post a request and receive response from server concurrently which I finally got to some reasonable walk-through but it is not working. Please kindly help.

button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try{
process();
} catch(Exception ex){
Log.e("Url Error Encoding", "Url Error Encoding");
}
}
});
}

public void process() throws UnsupportedEncodingException{

Prog = spinner1.getSelectedItem().toString();
Dept = spinner2.getSelectedItem().toString();
Session = spinner3.getSelectedItem().toString();
Semester = spinner4.getSelectedItem().toString();
Level = spinner5.getSelectedItem().toString();
Matric = matric.getText().toString();

SharedPreferences sharedPreferences = getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
College = sharedPreferences.getString(Config.COLLEGE_SHARED_PREF,"Not Available");

// Toast.makeText(ProfileActivity.this, Matric + College, Toast.LENGTH_SHORT).show();
// content.setText(Prog);


String data = URLEncoder.encode("program", "UTF-8")
+ "=" + URLEncoder.encode(Prog, "UTF-8");

data += "&" + URLEncoder.encode("dept", "UTF-8") + "="
+ URLEncoder.encode(Dept, "UTF-8");

data += "&" + URLEncoder.encode("session", "UTF-8") + "="
+ URLEncoder.encode(Session, "UTF-8");

data += "&" + URLEncoder.encode("semester", "UTF-8") + "="
+ URLEncoder.encode(Semester, "UTF-8");

data += "&" + URLEncoder.encode("level", "UTF-8") + "="
+ URLEncoder.encode(Level, "UTF-8");

data += "&" + URLEncoder.encode("college", "UTF-8") + "="
+ URLEncoder.encode(College, "UTF-8");

data += "&" + URLEncoder.encode("matric", "UTF-8") + "="
+ URLEncoder.encode(Matric, "UTF-8");

String text = "";
BufferedReader reader=null;

try{


//Send data

URL url = new URL("http://www.example.com/locator/checkresult.php");

// Send POST data request

URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( data );
wr.flush();

// Get the server response

reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;

// Read Server Response
while((line = reader.readLine()) != null)
{
// Append server response in string
sb.append(line + "\n");
}

text = sb.toString();



} catch(Exception ex){

ex.printStackTrace();
}
finally {
try
{
reader.close();
}

catch(Exception ex) {
ex.printStackTrace();
}
}

// Show response on activity
content.setText(text);

}


My php code

<?php

mysql_connect("localhost", "root", "zzz") or die(mysql_error());
mysql_select_db("sis");
$conn = mysql_connect("localhost", "root", "zzz");

$college = urldecode($_POST['college']);

$program = urldecode($_POST['program']);
$level = urldecode($_POST['level']);
$department = urldecode($_POST['dept']);
$semester = urldecode($_POST['semester']);
$session = urldecode($_POST['session']);
$matric = urldecode($_POST['matric']);

print "$program $level $department";

?>


//My profile.xml

<?xml version="1.0" encoding="UTF-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent">
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="10dp">
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="Large Text" android:id="@+id/textView" android:layout_marginBottom="20dp" />
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:id="@+id/textView2" android:layout_marginBottom="20dp" />
<TableLayout android:id="@+id/table" android:layout_width="wrap_content" android:layout_height="25dp" android:focusableInTouchMode="true" android:focusable="true" />
<TextView android:id="@+id/content" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="5dp" />
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Program" android:layout_marginBottom="5dp" />
<Spinner android:id="@+id/programme" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Level" android:layout_marginBottom="5dp" />
<Spinner android:id="@+id/level" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Department" android:layout_marginBottom="5dp" />
<Spinner android:id="@+id/dept" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Semester" android:layout_marginBottom="5dp" />
<Spinner android:id="@+id/semester" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Session" android:layout_marginBottom="5dp" />
<Spinner android:id="@+id/session" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#fff" android:layout_marginBottom="10dp" />
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="8dp" android:textStyle="bold" android:text="Enter your matric number" />
<EditText android:id="@+id/rmatric" android:layout_width="match_parent" android:layout_height="50dp" />
<Button android:id="@+id/checkresult" android:layout_width="match_parent" android:layout_height="match_parent" android:text="Check Result" />
</LinearLayout>
</ScrollView>


Please kindly help. Thanks.

Answer

Here is your example code

your php file

<?php
$val  =file_get_contents('php://input');
$jsonObj = json_decode($val);
$jsonObj  = (object)$jsonObj;
$data1 = $jsonObj->yourkey;
$data2 = $jsonObj->yourkey;

// your sql execution

$returnData = array(
    "code"  => 500,
    "msg"   => "UserName Already Exist!! Try with diffrent user Name!!",
    );
$a = json_encode($returnData);
echo $a;
die();

?>

here is some java code //fill your json object with key and value pairs

JSONObject object=new JSONObject();
try {
    object.put("key", value);
    object.put("key", value);

}catch (JSONException e){}


// make a request this should run on ui thred
String urlString = "";
RestHelper restHelper = new RestHelper(context);
RequestFuture requestFuture = RequestFuture.newFuture();
response = restHelper.postRequestTest(urlString,object,requestFuture);
System.out.println("Json Data" + response.toString() );

//libraries need to compile
compile 'com.mcxiaoke.volley:library:1.0.19'
compile 'com.google.code.gson:gson:2.3'

Here is RestHelper.java

import android.content.Context;
import android.graphics.Bitmap;
import android.widget.ImageView;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.RetryPolicy;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageRequest;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.RequestFuture;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.naitiks.helpme.Model.HappyMomentsModel;
import com.naitiks.helpme.R;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;

/**
 * Created by Naitik on 25-04-2016.
 */
public class RestHelper {

    private RequestQueue queue = null;
    private Context context = null;

    public void setQueue(RequestQueue queue) {
        this.queue = queue;
    }

    public RequestQueue getQueue() {
        return queue;
    }

    public RestHelper(Context context){
        this.context = context;
        queue= Volley.newRequestQueue(context);
    }
    public JSONObject postRequestTest(String url, final JSONObject userMap,final RequestFuture requestFuture){
        JsonObjectRequest postRequest = new JsonObjectRequest(Request.Method.POST, url, userMap,requestFuture,requestFuture);
        postRequest.setRetryPolicy(new RetryPolicy() {
            @Override
            public int getCurrentTimeout() {
                return 40000;
            }

            @Override
            public int getCurrentRetryCount() {
                return 5;
            }

            @Override
            public void retry(VolleyError volleyError) throws VolleyError {
            }
        });
        queue.add(postRequest);
        try {
            Object object = requestFuture.get();
            System.out.println("*** result" +object.toString());
            JSONObject result = (JSONObject)object;
            return result;
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
        return null;
    }
}