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时在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，我收到了构建错误：

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();