Android（里程碑/ Droid）：View.OnKeyListener无法正常工作？

Question

I am using a simple EditText and register an View.OnKeyListener . Some GUI changes should happen (fading in/out of views) when certain conditions for the EditView text apply. In the emulator, this works as expected. On the Motorola Droid/Milestone, the listener does not work, only

1. after pressing DEL, the listener is called the first time and always afterwards
2. when activating the number input, the listener works correctly

Note: I deactivated the suggestions with TYPE_TEXT_FLAG_NO_SUGGESTIONS and used the IME action IME_ACTION_GO to have a workaround for this (otherwise the user could not "start" a request).

Answer 1

找到了一种更好的工作方式来实现此目的：将EditText.addTextChangedListener与TextWatcher类一起使用（并实现TextWatcher.onTextChanged(CharSequence s, int start, int before, int count) ），在Milestone / Droid上也可以完美地工作。

Answer 2

TextWatcher cannot fully replace onKeyListener. For example, if your textbox is empty, how would you detect that user pressed DEL key? Or, what if you don't have textbox at all and you want to detect key events?