Android App Sending A String To Display On A Webpage

I've been trying to create an Android app and webpage for months now, where the app sends a simple string to the website and the website displays that text. I've tried many tutoria

Solution 1:

Alright, let me give you a very simple way to connect your application with PHP Service page... First you have to make sure you already has this libraries: 1- http-core-4.1.jar 2- httpclient-4.0.3.jar

Then create a new class name it "JSONParser" and paste this code:

import android.util.Log;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
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.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;

publicclassJSONParser {

    staticInputStreamis=null;
    staticJSONObjectjObj=null;
    staticStringjson="";

    // constructorpublicJSONParser() {

    }

    // function get json from url// by making HTTP POST or GET mehtodpublic JSONObject makeHttpRequest(String url, String method,
                                      List<NameValuePair> params) {

        // Making HTTP requesttry {

            // check for request methodif(method == "POST"){
                // request method is POST// defaultHttpClientDefaultHttpClienthttpClient=newDefaultHttpClient();
                HttpPosthttpPost=newHttpPost(url);
                httpPost.setEntity(newUrlEncodedFormEntity(params));

                HttpResponsehttpResponse= httpClient.execute(httpPost);
                HttpEntityhttpEntity= httpResponse.getEntity();
                is = httpEntity.getContent();

            }elseif(method == "GET"){
                // request method is GETDefaultHttpClienthttpClient=newDefaultHttpClient();
                StringparamString= URLEncodedUtils.format(params, "utf-8");
                url += "?" + paramString;
                HttpGethttpGet=newHttpGet(url);

                HttpResponsehttpResponse= httpClient.execute(httpGet);
                HttpEntityhttpEntity= httpResponse.getEntity();
                is = httpEntity.getContent();
            }

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

        try {
            BufferedReaderreader=newBufferedReader(newInputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuildersb=newStringBuilder();
            Stringline=null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

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

        // return JSON Stringreturn jObj;

    }
}

Well, now go to your main activity and do it as this:

publicclassMainActivityextendsAppCompatActivity {
JSONParser jparser = newJSONParser(); 
 ProgressDialog pdialog;

 @OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

String msg = "Hello";

newconnector().execute(msg); //This will create a new thread to connect with your service page.


}

//The AsyncClass connector..classconnectorextendsAsyncTask<String,String,String> {
        @OverrideprotectedvoidonPreExecute(){
            pdialog = newProgressDialog(MainActivity.this);
            pdialog.setMessage("Sending Hi...");
            pdialog.setCancelable(false);
            pdialog.setIndeterminate(false);
            pdialog.show();
        }
        //ArrayList to carry your valuesList<NameValuePair> data = newArrayList<>();

        @OverrideprotectedStringdoInBackground(String... params) {

            try {

                    data.add(newBasicNameValuePair("msg",params[0])); //here we sit the key "msg" to carry your value which you passed on thread execute.//Then create the JSONObject to make the rquest and pass the data(ArrayList).              JSONObject json = jparser.makeHttpRequest("Http://example.com/mypage.php","POST",data);

/*In case you want to receive a value from your page you should do something like this..
String getString = json.getString("key1");
Int getInt = json.getInt("key2");
key1,key2 are keys that you send from your page.
*/





            } catch (Exception e) {
               /* Any Exception here */
            }

            returnnull;

        }

        @OverrideprotectedvoidonPostExecute(String file_url){
            pdialog.dismiss();
              // This After the thread did it's operate/* For Example you Toast your key1,key2 values :D*/

            }
    }



}

In your PHP page you should do as the following..

<?php//In case of receive..$msg = $_POST['msg']; 
echo$msg;

//In case of send..$values = array();
$values["key1"] = "Hello this is key1";
$values["key2"] = "Hello this is key2";
echo json_encode($values); //this will make a json encode which you can get it back in your application ;)?>

Hope it helps :), and sorry for my bad English :v