登出后不应清除会话数据

Question

我是android新手。我只希望当我注销该应用程序时，会话不应该清除，而当同一用户再次登录时，它应该显示其用户名（从会话中获取），并要求输入密码。预先感谢。

`if（id == R.id.nav_logout）{

        builder = new AlertDialog.Builder(this);
        builder.setCancelable(false);
        builder.setTitle("Logout Confirmation");
        builder.setMessage("Do you want to logout ?");
        builder.setIcon(R.drawable.ic_exit_to_app_black_24dp);
        builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

                UserSessionManager sessionManager = new UserSessionManager(MainActivity.this);
                sessionManager.setIsLogin(false);
                Intent intent = new Intent(MainActivity.this, Login.class);
                startActivity(intent);
                finish();
            }
        });
        builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });

        AlertDialog dialog = builder.create();
        dialog.show();

        dialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(Color.parseColor("#CC0809"));
        dialog.getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(Color.parseColor("#CC0809"));


    }`