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How to send a string from Android to php

I tried to create online applications. I would like to send a string from my applications to my PHP script, but in the end php did not get a single line from my applications, which means that PhP will return NULL. I did research online and looked for a solution, but none of them worked.

Below is my MainActivity.java code:

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 ie 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(); } }); } }

And my php code:

 <?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; } ?>

This is my 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>
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2 answers

To facilitate this, there are many libraries that save many lines of code, I especially suggest retrofit .

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Try this code.

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(); } } } } }
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