相关疑难解决方法(0)

一个简单的问题:

我收到错误:无法从String转换为可编辑.这是代码:

Credential.getInstance().UserName = preferences.getString("UserName", "invalid value");
Credential.getInstance().Password = preferences.getString("UserName", "invalid value");

我也尝试过像下面那样:

Credential.getInstance().UserName = (Editable) preferences.getString("UserName", "invalid value");
Credential.getInstance().Password = (Editable) preferences.getString("UserName", "invalid value");

这次我收到错误:无法从String转换为Editable.

该怎么办？