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我想包括一個代碼，當用戶註冊已在我的應用中使用的用戶名時，他/她會得到一個敬酒「用戶名已被佔用」。如何通過「用戶名已被佔用」來防止重複登錄活動
Register.java
public class Register extends AppCompatActivity {
EditText regEmail, regPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
regEmail = (EditText)findViewById(R.id.reg_email);
regPassword = (EditText)findViewById(R.id.reg_password);
}
public void OnReg(View view) {
String strEmail = regEmail.getText().toString();
String strPassword = regPassword.getText().toString();
String type = "register";
BackgroundWorker backgroundWorker = new BackgroundWorker(this);
backgroundWorker.execute(type, strEmail, strPassword);
}}
BackgroundWorker.java
public class BackgroundWorker extends AsyncTask<String,Void,String> {
Context context;
AlertDialog alertDialog;
BackgroundWorker (Context ctx){
context = ctx;
}
@Override
protected String doInBackground(String... params) {
String type = params[0];
String login_url = "http://10.93.22.231/login.php";
String register_url = "http://10.93.22.231/register.php";
if (type.equals("login")){
try {
String email = params[1];
String password = params[2];
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else if (type.equals("register")){
try {
String regEmail = params[1];
String regPassword = params[2];
URL url = new URL(register_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(regEmail,"UTF-8")+"&"
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(regPassword,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
result += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Login Status");
}
@Override
protected void onPostExecute(String result) {
alertDialog.setMessage(result);
if (result.contains("success")) {
Intent intent = new Intent(context, MainActivity.class);
context.startActivity(intent);
} else {
alertDialog.show();
}
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
Register.php
<?php
require "conn.php";
$email = $_POST["email"];
$password = $_POST["password"];
$mysql_qry = "INSERT INTO users (email, password) VALUES ('$email','$password')";
if($conn->query($mysql_qry) === TRUE){
echo "Insert successful";
} else {
echo "Insert failed, please try again.";
}
$conn->close();
?>
（）方法中，你有串。你可以將它轉換爲JSONObject，它應該包含你的實際消息。然後獲取該信息並烘烤。 – Noorul
'onPostExecute'你在結果中得到了什麼..？ –
@jun Guo您的php代碼不包含任何用戶驗證查詢或code.add驗證查詢或代碼並嘗試 – Noorul