实现一个 Android 应用的登录界面，包括与数据库的交互来验证用户输入的账号密码，以及处理登录和注册按钮的点击事件。
实现一个 Android 应用的登录界面，包括与数据库的交互来验证用户输入的账号密码，以及处理登录和注册按钮的点击事件。
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