Question

I have followed his popular tutorial to connect Android to MySQL:
http://www.helloandroid.com/tutorials/connecting-mysql-database

It is great at encoding the data back in JSON and displaying rows of data.

My question: What id I want to return just a single value, a single varaible from PHP to Java?

Here is my PHP:

$sql="SELECT AVG(rating) FROM ratings WHERE item_id = 1";
$result=mysql_query($sql);
$row=mysql_fetch_array($result);
echo $row[0];

I want to send that last “echo” back to Android, on the guidelines of that tutorial above, how would I do this?

Answer 1

$row is an array and it should have a value like:

$row['AVG(rating)'] = <some value>

All you need to do is throw the json_encode function around row and echo it out

print(json_encode($row));

This should get you the single value json encoded string that the java code can read.