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POAndroid and PHP connection to MySQL Database
 

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  1. POAndroid and PHP connection to MySQL Database
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    <p>i have the following code and i am struggling to get it working . There are 2 errors in the java file and i can not find a fix.</p> <p>here is my MySQLData.java file</p> <pre><code>package com.example.qosmetre2; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.util.ArrayList; import org.apache.http.HttpEntity; 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.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.net.ParseException; import android.os.Bundle; import android.util.Log; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import org.apache.http.NameValuePair; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.ListActivity; import android.app.ProgressDialog; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; public class MySQLData extends ListActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String result = null; InputStream is = null; StringBuilder sb=null; String result=null; //http post try{ HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("http://localhost/android_test/fetch_data2.php"); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent(); }catch(Exception e){ Log.e("log_tag", "Error in http connection"+e.toString()); } //convert response to string try{ BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); sb = new StringBuilder(); sb.append(reader.readLine() + "\n"); String line="0"; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } is.close(); result=sb.toString(); }catch(Exception e){ Log.e("log_tag", "Error converting result "+e.toString()); } //paring data String nam; int rec_pow; int tow; int stat; try{ JSONArray jArray = new JSONArray(result); JSONObject json_data=null; for(int i=0;i&lt;jArray.length();i++){ json_data = jArray.getJSONObject(i); nam=json_data.getString("name"); rec_pow=json_data.getInt("recieved_power"); tow=json_data.getInt("tower"); stat=json_data.getInt("status"); } }catch(JSONException e1){ Toast.makeText(getBaseContext(), "Could not Parse Data", Toast.LENGTH_LONG).show(); }catch (ParseException e1){ e1.printStackTrace(); } } } </code></pre> <p>There is an error on the following 2 lines: </p> <pre><code>String result=null; httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); </code></pre> <p>The first error says duplicate local variable result, and the second error says nameValuePairs cannot be resolved to a variable.</p> <p>i also have a php file that i put in my wamp server and i would like the infro thats showing up on my local server to be in the application. I read somewhere that i might have to port forward so that i could acces from the app over the internet, but i don't know. The app wont run until the errors are fixed.</p> <p>Here is my PHP file fetch_data2.php</p> <pre><code> &lt;?php mysql_connect("888888","8888888","*******"); mysql_select_db("*******"); $q=mysql_query("SELECT * FROM users"); while($row=mysql_fetch_assoc($q)) $output[]=$row; print(json_encode($output)); mysql_close(); ?&gt; </code></pre>
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    1. COWhat IDE are you using for Java? A decent one would underline duplicate and undefined variables.
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