使用php的技术Json，我创建了内容为jObject:JSONObject的“mylist”列表，我想测试这个列表是否为空（mylist.size()）。
但它不起作用，因为它给了我permission denied错误。
登录活动是：
> public class LoginActivity extends Activity {
int TIMEOUT_MILLISEC = 10000; // = 10 seconds
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
final EditText txtNumCompte = (EditText)findViewById(R.id.txtNumCompte);
final EditText txtCodCompte = (EditText)findViewById(R.id.txtCodCompte);
Button btnLogin = (Button)findViewById(R.id.btnLogin);
btnLogin.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
String numcompte = txtNumCompte.getText().toString();
String codecompte = txtCodCompte.getText().toString();
if (numcompte.equals("") || codecompte.equals(""))
{
Toast.makeText(getBaseContext(),
"Numéro et code confidentiel de compte sont obligatoires",
Toast.LENGTH_SHORT).show();
}
Pattern p = Pattern.compile(".[0-9]+");
Matcher m = p.matcher(numcompte);
if (m.matches() == false)
{
Toast.makeText(LoginActivity.this,
"La carte est non trouvée \nVeuillez vérifier son numéro",
Toast.LENGTH_SHORT).show();
}
try{
JSONObject json = new JSONObject();
json.put("num", txtNumCompte.getText().toString());
json.put("code", txtCodCompte.getText().toString());
HttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams,
TIMEOUT_MILLISEC);
HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT_MILLISEC);
HttpClient httpclient = new DefaultHttpClient(httpParams);
String url = "http://10.0.2.2/connect.php";
HttpPost httppost = new HttpPost(url);
try {
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String responseBody = httpclient.execute(httppost,
responseHandler);
JSONObject json2 = new JSONObject(responseBody);
JSONArray jArray = json2.getJSONArray("posts");
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
for (int i = 0; i < jArray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = jArray.getJSONObject(i);
String s = e.getString("post");
JSONObject jObject = new JSONObject(s);
map.put("numcompte", jObject.getString("Num_Compte"));
map.put("codecompte", jObject.getString("Code_Compte"));
mylist.add(map);}
if (mylist.size()==0){
Toast.makeText(LoginActivity.this,"Numéro/code confidentiel invalide", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(LoginActivity.this,"Connecté avec succès", Toast.LENGTH_LONG).show();
Intent intent= new Intent(LoginActivity.this,MenuActivity.class);
startActivity(intent);
}
} catch (ClientProtocolException e) {
Toast.makeText(LoginActivity.this,"dsl , probleme de connexion",Toast.LENGTH_LONG).show();
} catch (UnsupportedEncodingException e) {
Toast.makeText(LoginActivity.this,"dsl", Toast.LENGTH_LONG).show();
} catch (IOException e) {
Toast.makeText(LoginActivity.this,e.getMessage(),Toast.LENGTH_LONG).show();
}
}
catch (JSONException e) {
Toast.makeText(LoginActivity.this,"dsl , probleme dans le serveur , essayez autre fois",Toast.LENGTH_LONG).show();
}
}
});
}
}
这是connect.php
<?php
$json = file_get_contents('php://input');
$obj = json_decode($json);
$link = mysql_connect('localhost','root','') or die('Cannot connect to the DB');
mysql_select_db('baseposte',$link) or die('Cannot select the DB');
$query = "SELECT * FROM user where '".$obj->{'num'}."'=Num_Compte and '".$obj->{'code'}."'=Code_Compte";
$result = mysql_query($query,$link) ;
/* create one master array of the records */
$posts = array();
if(mysql_num_rows($result)) {
while($post = mysql_fetch_assoc($result)) {
$posts[] = array('post'=>$post);
}
}
header('Content-type: application/json');
echo json_encode(array('posts'=>$posts));
/* disconnect from the db */
@mysql_close($link);
?>