Alterando a Linha
$json['news'][]=$row;
para $json['news'][]=array_map('utf8_encode', $row);
resolveu o problema. Existem caracteres como ä, ö.... na tabela do banco de dados. $con=mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
$sql = "SELECT `titel` FROM `news` ORDER BY `datum` DESC";
$result = mysql_query($sql);
$json = array();
if(mysql_num_rows($result)){
while($row=mysql_fetch_assoc($result)){
$json['news'][]=array_map('utf8_encode', $row);
}
}
mysql_close($con);
echo json_encode($json);