android - 在 Android 框架中显示 Toast 通知

Question

我正在尝试通过在密码验证完成后在 PasswordUnlockScreen.java 文件中显示 Toast 通知来修改 Android 框架。我在 verifyPasswordAndUnlock() 中添加了以下代码行

Toast.makeText(getApplicationContext(), "Verifying password", Toast.LENGTH_LONG).show();

但是，我收到构建错误：

frameworks/base/policy/src/com/android/internal/policy/impl/PasswordUnlockScreen.java:166: cannot find symbol symbol  : method getApplicationContext()
location: class com.android.internal.policy.impl.PasswordUnlockScreen
Toast.makeText(getApplicationContext(), "Verifying password", Toast.LENGTH_LONG).show();

我应该使用什么作为上下文而不是 getApplicationContext()？

谢谢！

Answer 1

试试这个：

Toast.makeText(PasswordUnlockScreen.this, "Verifying password", Toast.LENGTH_LONG).show();