Question

当我将计数器设置为减去并关闭应用程序时，我收到错误。我收到错误“无法为最终变量计数器赋值”。如果用户登录3次但没有成功退出应用程序。

        final int counter = 3;

        //Set the OKButton to accept onClick
        OKButton.setOnClickListener(new View.OnClickListener() {
            @Override

            //once onClick is initalized it takes user to page menu
            public void onClick(View v) {

                //display text that was inputed for userText and passText
                user = userText.getText().toString();
                pass = passText.getText().toString();

                //create if loop which checks if user and pass equals the credentials
                if (user.equals("pshivam") && pass.equals("Bway.857661")) {

                    //display toast access welcome
                    String welcome = "Access Granted.";

                    //Create a Toast to display the welcome string in the MainActivity.
                    Toast.makeText(MainActivity.this, welcome, Toast.LENGTH_SHORT).show();
                    setContentView(R.layout.account_main);
                }
                //create else if loop which checks if user or pass does not equals the credentials
                else if (!user.equals("pshivam") || !pass.equals("Bway.857661")){

                    //displays previous entry
                    userText.setText(user);
                    passText.setText(pass);

                    //allows user to re-enter credentials.
                    user = userText.getText().toString();
                    pass = passText.getText().toString();


                    //display toast access fail
                    String fail = "Access Denied! Please Try again.";
                    //Create a Toast to display the fail string in the MainActivity.
                    Toast.makeText(MainActivity.this, fail, Toast.LENGTH_SHORT).show();
                    counter--;
                    if(counter == 0){
                        finish();
                    }
                }
            }
        });
    }
}

Answer 1

做这样的事情：

OKButton.setOnClickListener(new View.OnClickListener() {
            int counter = 3;
            @Override
            //once onClick is initalized it takes user to page menu
            public void onClick(View v) {

您也可以从onClick内部调用一个函数来减少变量，或者使用类中声明的静态字段

此How to increment a Counter inside an OnClick View Event和How do I use onClickListener to count the number of times a button is pressed?可能有所帮助。

编辑：

你在其他部分所做的事情没有意义。您正在使用getText（）从这些设置userText和passText的文本。然后，您将这些相同的值存储到user和pass。但是你没有在任何地方使用这些变量，并且当再次调用onClick时它们会获得新的值。为什么不保持简单：

                else {

                    //display toast access fail
                    String fail = "Access Denied! Please Try again.";
                    //Create a Toast to display the fail string in the MainActivity.
                    Toast.makeText(MainActivity.this, fail, Toast.LENGTH_SHORT).show();
                    counter--;
                    if(counter == 0){
                        finish();
                    }
                }

如何在android studio中添加计数器以退出应用程序

1 个答案: