問題描述
有沒有一種方法可以為 Android 中的 EditText 控件指定輸入掩碼?
Is there a way I can specify an input mask to the EditText control in Android?
我希望能夠為社會安全號碼指定類似 ### - ## - #### 的內容.這將導致自動拒絕任何無效輸入(例如，我輸入字母字符而不是數字).
I want be able to specify something like ### - ## - #### for a Social Security Number. This will cause any invalid input to be rejected automatically (example, I type alphabetical characters instead of numeric digits).
我意識到我可以添加一個 OnKeyListener 并手動檢查有效性.但這很乏味，我將不得不處理各種邊緣情況.
I realize that I can add an OnKeyListener and manually check for validity. But this is tedious and I will have to handle various edge cases.
嗡嗡聲
推薦答案
嘗試使用 InputFilter 而不是 OnKeyListener.這意味著您不必擔心跟蹤單個按鍵，它還可以處理諸如粘貼到字段中之類的事情，而使用 OnKeyListener 來處理這些事情會很痛苦.
Try using an InputFilter rather than an OnKeyListener. This means you don't have worry about tracking individual key presses and it will also handle things like pasting into a field which would be painful to handle with an OnKeyListener.
你可以看看 Android 附帶的 InputFilter 實現的源代碼，為您提供編寫自己的起點.
You could have a look at the source of the InputFilter implementations that come with Android to give you a starting point for writing your own.
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