java - android - 获取软键盘按键

Question

我正在尝试按下软键盘上的键，但我无法这样做。目前我正在使用以下代码

@Override
public boolean dispatchKeyEvent(KeyEvent KEvent) 
{
int keyaction = KEvent.getAction();

if(keyaction == KeyEvent.ACTION_DOWN)
{
    int keycode = KEvent.getKeyCode();
    int keyunicode = KEvent.getUnicodeChar(KEvent.getMetaState() );
    char character = (char) keyunicode;

    System.out.println("DEBUG MESSAGE KEY=" + character + " KEYCODE=" +  keycode);
}


return super.dispatchKeyEvent(KEvent);

它正在捕获硬件键盘而非虚拟键盘的按键事件。谁能帮帮我

Answer 1

来自Android Official Page

Note: When handling keyboard events with the KeyEvent class and related APIs, you should expect that such keyboard events come only from a hardware keyboard. You should never rely on receiving key events for any key on a soft input method (an on-screen keyboard).

所以你应该使用TextWatcher观察软键盘上按下的字符的接口(interface)，示例:

myEditText.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {


        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            // TODO Auto-generated method stub
        }

        @Override
        public void afterTextChanged(Editable s) {

            // TODO Auto-generated method stub
        }
    });