java - 即使应用程序关闭，如何暂时禁用按钮？

Question

所以我创建了一个简单的登录 Activity 。当用户登录失败3次后，登录按钮将被禁用一段时间。

我的困难是，当我关闭应用程序并再次打开它时，按钮又重新启用。如何解决这个问题？

这是我的代码:

public class LoginControl extends Activity {
private DBControl db = new DBControl(this);
int counter = 2;
Button login = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.loginview);


    Button register = (Button) findViewById(R.id.btnCreateA);
    login = (Button) findViewById(R.id.btnLogin);
    login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                EditText a = (EditText) findViewById(R.id.etUser);
                EditText b = (EditText) findViewById(R.id.etPassword);
                String user = a.getText().toString();
                String pass = b.getText().toString();
                String confirm = db.getUserPass(user);
                if (user.equals("") || pass.equals("")) {
                    Toast passed = Toast.makeText(LoginControl.this, "Please input required fields.", Toast.LENGTH_LONG);
                    passed.show();
                } else if (pass.equals(confirm)) {
                    Toast passed = Toast.makeText(LoginControl.this, "Sucess!", Toast.LENGTH_LONG);
                    passed.show();
                    Intent intent = new Intent(LoginControl.this, HomeControl.class).putExtra("Music", false);
                    startActivity(intent);
                    finish();

                } else if (counter == 0)
                // Disable button after 3 failed attempts
                {

                    login.setEnabled(false);

                    Toast alert = Toast.makeText(LoginControl.this, "Login Disabled for 5 mins", Toast.LENGTH_LONG);
                    alert.show();

                    final Handler handler = new Handler();
                    handler.postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            login.setEnabled(true);
                            counter = 2;
                        }
                    }, 30000);
                } else {
                    Toast passed = Toast.makeText(LoginControl.this, "Username or password don't match!", Toast.LENGTH_LONG);
                    counter--;
                    passed.show();
                }
            } catch (Exception e) {
                Toast passed = Toast.makeText(LoginControl.this, e.toString(), Toast.LENGTH_LONG);
                passed.show();
            }
        }
    });
}

}

Answer 1

要获取此信息，即使应用程序重新启动，您也需要保存按钮再次启用的时间。当您的应用程序启动时，您可以打开此信息并检查它是在该时间之前还是之后。

有几种方法可以在 android 上存储信息:

• 共享偏好设置:https://developer.android.com/training/basics/data-storage/shared-preferences.html
• SQLite 数据库:https://developer.android.com/training/basics/data-storage/databases.html
• 另存为文件:https://developer.android.com/training/basics/data-storage/files.html

对于您的问题，我建议您应该使用共享首选项。