通过AsyncTask自动获取以前输入的用户名，pwd

Question

通过使用php从MYSQL获取用户名和密码登录通过AsyncTask代码会好起来，但当压抑时我显示警报栏，你想注销吗？然后我的LoginActivity进入画面。即使用户输入了错误的用户名或密码，也会提取以前的登录数据。 这里是我的PHP代码

<?php 

    include("db.php"); 

    include("database.php"); 

    $uname=$_REQUEST['Username']; 

    $upassword=$_REQUEST['Password']; 

    if($upassword!='' && $uname!=''){ 

    $resultFac = SelectSingleRow("FacultyLogin","Password='$upassword' AND Username='$uname'",""); 

    if($resultFac['FacultyID']!=''){ 

     $facid= $resultFac['FacultyID']; 

     $resultEmp = SelectSingleRow("tblFaculty","ID='$facid'",""); 

     if($resultFac['ID']!=''){ 

     $empid= $resultEmp['EmployeeID']; 

     $response["Emp_id"]=$empid; 

     $response["flag"]=1; 

     echo json_encode($response); 

     } 

    } 

    else{ 

     $response["flag"]=0; 

      echo "Please enter correct user name password"; 

     echo json_encode($response); 

    } 

    }else{ 

     $response["flag"]=0; 

     echo json_encode($response); 

     echo "Please enter both the fields"; 

    } 

    ?> 

和我的登录活动

public class LoginActivity extends Activity { 
    int flag; 
    int empid; 
    String username; 
    String password; 

    EditText edUsername,edPassword; 

    private ProgressDialog pDialog; 

    JSONParser jParser = new JSONParser(); 
    JSONArray jarray; 

    ArrayList<HashMap<String, String>> productsList; 

    private static String url_faculty_login = "http://10.0.2.2/xyz/login_check.php"; 
    private static final String TAG_EMPLOYEE = "employee_id"; 
    private static final String TAG_PID = "pid"; 
    private static final String TAG_NAME = "name"; 



    @Override 
    public void onCreate(Bundle savedInstanceState) { 


     super.onCreate(savedInstanceState); 
     setContentView(R.layout.login); 
    // setTitleColor(1); 

     Intent i=new Intent(); 


     edUsername=(EditText) findViewById(R.id.edUserName); 
     edPassword=(EditText) findViewById(R.id.edPassword); 
     String clear="clear"; 

    } 

@Override 
protected void onStop() { 
    // TODO Auto-generated method stub 
    super.onStop(); 
    LoginActivity.this.finish(); 
    // LoginActivity. 

} 

//@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 


    LoginActivity.this.finish(); 
} 
//onClick login.xml Button 
    public void signIn(View view) { 
     //call to inner class 
     if(edUsername!=null && edPassword!=null) 
     { 
      new LoadAllProducts().execute(); 

     } 
     else 
     { 
      Toast.makeText(getApplicationContext(), "Enter Both Fields", Toast.LENGTH_LONG); 

     } 
    } 

    class LoadAllProducts extends AsyncTask<String, String, String> { 
     private static final String Emp_id = "Emp_id"; 


     public String doInBackground(String... args) { 
      username=edUsername.getText().toString(); 
      password=edPassword.getText().toString(); 

      List<NameValuePair> params = new ArrayList<NameValuePair>(); 

      params.add(new BasicNameValuePair("Username", username)); 
      params.add(new BasicNameValuePair("Password", password)); 



      JSONObject json = jParser.makeHttpRequest(url_faculty_login, "POST", params); 
      Log.d("Username n password: ", json.toString()); 

      try { 
       flag=json.getInt("flag"); 
       Log.d("flags",""+flag); 
      } catch (JSONException e) { 

      e.printStackTrace(); 
      } 

      if(flag==1) 
      {   
       try 
       { 
        empid=json.getInt(Emp_id); 
       } 
       catch (JSONException e) 
       { 
        e.printStackTrace(); 
       } 
       Intent i=new Intent(getApplicationContext(),ClassActivity.class); 
       i.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY); 
       i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
       i.putExtra("Emp_id", ""+empid); 
       Log.d("Empid",""+empid); 

       startActivity(i); 
      } 
      if(flag==0) 
      { 
       Intent i=new Intent(getApplicationContext(),InvalidUPLoginActivity.class); 

       startActivity(i); 
      } 
     return null; 
    } 
} 
} 

Answer 1

后

username=edUsername.getText().toString(); 
    password=edPassword.getText().toString(); 

    edUsername.setText(""); 
    edPassword.setText("");