Question

Hi In My在加载后单击登录按钮用户名和密码后，我需要清除用户名和密码。并登录它正在移动到下一个活动但是，点击模拟器后退按钮对话框显示加载符号。任何人都可以帮助我。

登录

 login.setOnClickListener(new OnClickListener() {
           @Override
           public void onClick(View v) {
              dialog = ProgressDialog.show(Login.this, "", 
                       "loading", true);  

             dialog.show();
               isInternetPresent = cd.isConnectingToInternet();
               if (!isInternetPresent) {
                   showAlertDialog(Login.this, "No Internet Connection",
                           "You don't have internet connection.", true);

                   return;


               }
               String username = usname.getText().toString();
               String password = pword.getText().toString();

               String name = user.get(SessionManager.KEY_USERNAME);


                   if (username.equals("")) {
                       Toast.makeText(Login.this, "ENTER USERNAME",
                               Toast.LENGTH_LONG).show();

                   }
                   if (password.equals("")) {
                       Toast.makeText(Login.this, "ENTER PASSWORD",
                               Toast.LENGTH_LONG).show();

                   }

              else if (!CheckUsername(username) && !CheckPassword(password)){
                       Toast.makeText(Login.this, "ENTER VALID USERNAME & PASSWORD",
                             Toast.LENGTH_LONG).show();
               }
               else{
                   queryString = "username=" + username + "&password="
                            + password ;
                  String usertype = DatabaseUtility.executeQueryPhp("usertype",queryString);
                  System.out.print(usertype);

            if(usertype.equalsIgnoreCase("Admin user Found")){
                runOnUiThread(new Runnable() {
                    public void run() {

                        Toast.makeText(Login.this, "Login Sucess",
                                   Toast.LENGTH_LONG).show();

                    }
                });
                dialog.dismiss();
                startActivity(new Intent(Login.this, Home.class));


            }
            else if(usertype.equalsIgnoreCase("Student User Found")){
                runOnUiThread(new Runnable() {
                    public void run() {
                        Toast.makeText(Login.this, "Login Sucess",
                                   Toast.LENGTH_LONG).show();


                    }
                });

                dialog.dismiss();
                Intent i = new Intent(Login.this, StudentPortal.class);

                i.putExtra("username",username);

            startActivity(i);
            }

            else if(usertype.equalsIgnoreCase("Teacher  user Found")){
                runOnUiThread(new Runnable() {
                    public void run() {
                        Toast.makeText(Login.this, "Login Sucess",
                                   Toast.LENGTH_LONG).show();

                    }
                });
                dialog.dismiss();
                startActivity(new Intent(Login.this, Home.class));
                finish();
            }
            else if(usertype.equalsIgnoreCase("No User Found")){
                runOnUiThread(new Runnable() {
                    public void run() {

                        tv1.setText("InValid UserName and Password");


                    }

                });
                        }


            }

           }


         });

       tv1.setText("");

    }

Answer 1

dialog = ProgressDialog.show(Login.this, "",  
                       "loading", true);   

             dialog.show();

您正在显示进度对话框，我没有看到您在执行任何操作/ startActivity后将其解雇。

dialog.dismiss();

Answer 2

在您调用startActivity时，忽略对话框，将以下代码放在'startActivity'上

dialog.dismiss（）

或者您可以通过自定义方法进行解散。

Answer 3

你应该致电

dialog.dismiss();

开始新活动之前

Answer 4

如果没有将登录活动保留在堆栈中并且禁止用户返回它，则应将其添加到您的活动映射中：LoginActivity" android:excludeFromRecents="true">

Answer 5

如果您使用AsyncTask.

，这是最好的方法

AsyncTask点击onPreExecute()显示Button，onPostExecute(Result) 忽略该对话框，移至下一个活动，进行更改在用户界面中显示Toast ，并在doInBackground(Params...)所有Dialog调用

如何解除对话并清除android中的用户名和密码

5 个答案: