how to fetch associative array elements in android java? - php

Question

i'm trying to fetch value of an array from mysql database in php and display those in android activity.
php code:
Here my array has two values, say $j[] has 1 and 2.
for($y=0;$y<2;$y++){
$val2 ="t".$y;
$set = mysql_query("SELECT col3 FROM table WHERE col2 ='size' AND col1 ='".$j[$val2]."'",$con); //col1 has two value hence given in for loop
$res= mysql_fetch_array($set); //it displays two size value for each col1
$a1[]="size".$y;
$r1[] = $res['col3'];
$set2 = mysql_query("SELECT col3 FROM table WHERE col2 ='price' AND col1 ='".$l[$val2]."'",$con); // same like above
$res2= mysql_fetch_array($set2);
$a2[]="price".$y;
$r2[] = $res2['meta_value'];
}
$h=array();
for($z=0;$z<$y;$z++){
$h[]=array($a1[$z] => $r1[$z], $a2[$z] => $r2[$z]); // storing values of size and price in associative array
$check='1';
}
$r=$h[];
if($check==NULL)
{
$r[$num_rows]="Record is not available";
print(json_encode($r));
}
else
{
$r[$num_rows]="success";
print(json_encode($r));
}
and the output while running this php page,
[[{"size0":"14","price0":"300"},{"size1":"18","price1":"350"}],"success"]
and my android activity is,
String result = null;
InputStream is = null;
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(link);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("log_tag", "connection success ");
}
catch(Exception e)
{
Log.e("log_tag", "Error in http connection "+e.toString());
Toast.makeText(getApplicationContext(), "Connection fail", Toast.LENGTH_SHORT).show();
}
//convert response to string
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
result=sb.toString();
Log.e("log_tag", result);
}
catch(Exception e)
{
Log.e("log_tag", "Error converting result "+e.toString());
Toast.makeText(getApplicationContext(), " Input reading fail", Toast.LENGTH_SHORT).show();
}
try
{
JSONArray jArray = new JSONArray(result);
String re=jArray.getString(jArray.length()-1);
int flag=1;
for(int i=0;i<jArray.length()-1;i++)
{
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag2","title: "+jArray['price0']);
}
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data "+e.toString());
Toast.makeText(getApplicationContext(), "JsonArray fail", Toast.LENGTH_SHORT).show();
}
But i'm getting error as Error parsing data org.json.JSONException: Value of type org.json.JSONArray cannot be converted to JSONObject
i dono how to get value?

Answer 1

for(int i=0;i<jArray.length();i++) {
JSONArray jArrayInner = jArray.optJSONArray(i);
if (jArrayInner != null) {
for(int j=0;j<jArrayInner.length();j++) {
JSONObject json_data = jArrayInner.getJSONObject(j);
Log.i("log_tag2","title: "+json_data.optString("price0"));
Log.i("log_tag2","title: "+json_data.optString("size0"));
}
}
}
}
to retrieve data from the inner json object, that you are correctly retriving from the array, you have to use the optString (opt*Type) method. Also you should have the same key for every inner object inside your array (price and size).

Answer 2

To get data from a JSON Array, for instance :
for(int index = 0; index < jArray.length(); index++)
{
String size0 = jArray.getJSONObject(index).getString("size0");
String price0 = jArray.getJSONObject(index).getString("price0");
}