java - 使用getCurrentFocus时requestFocus不会更改焦点

我正在制作OTP Activity，并且需要实现删除功能，我具有以下功能，应该在退格按钮的onKey中触发以下功能。我的想法是，我可以使用getCurrentFocus知道当前正在填充哪些字段，然后使用requestFocus之前选择一个字段，但是它似乎不起作用，我为goToNext设置了另一个功能也可以，所以我很困惑为什么。

 public void goToPrevious() {
    EditText currentFocus = (EditText) getCurrentFocus();


    if (currentFocus == otpOne) {
        return;
    }

    if (currentFocus == otpTwo) {
        otpOne.requestFocus();

        return;
    }

    if (currentFocus == otpThree) {
        otpTwo.requestFocus();

        return;
    }

    if (currentFocus == otpFour) {
        otpThree.requestFocus();

        return;
    }
}

以下是goToNext正常工作的代码。

public void goToNext() {
    EditText currentFocus = (EditText) getCurrentFocus();

    if (currentFocus == otpOne) {
        otpTwo.requestFocus();

        return;
    }

    if (currentFocus == otpTwo) {
        otpThree.requestFocus();

        return;
    }

    if (currentFocus == otpThree) {
        otpFour.requestFocus();

        return;
    }

    if (currentFocus == otpFour) {
        return;
    }
}

我通过实现onKeyListener来调用goToPrevious，下面是代码

 @Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
    EditText currentFocus = (EditText) getCurrentFocus();
    Log.i("ENOUGH", "onKey: " + keyCode + " " + event.getAction() + " " + KeyEvent.KEYCODE_DEL);
    switch (event.getKeyCode()) {
        case KeyEvent.KEYCODE_DEL: {
            currentFocus.setText(null);
            goToPrevious();
            return false;
        }
    }
    return false;
}

最佳答案

由于某些非常奇怪的原因，我必须通过将getCurrentFocus的值直接传递到goToPrevious来修复它，原因是getCurrentFocus处理程序中的onKey值不同于goToPrevious，下面是我最终得到的代码。

public void goToNext(EditText currentFocus) {

    if (currentFocus == otpOne) {
        otpTwo.requestFocus();

        return;
    }

    if (currentFocus == otpTwo) {
        otpThree.requestFocus();

        return;
    }

    if (currentFocus == otpThree) {
        otpFour.requestFocus();

        return;
    }

    if (currentFocus == otpFour) {
        return;
    }
}

public void goToPrevious(EditText currentFocus) {

    if (currentFocus == otpOne) {
        return;
    }

    if (currentFocus == otpTwo) {
        otpOne.requestFocus();

        return;
    }

    if (currentFocus == otpThree) {
        otpTwo.requestFocus();

        return;
    }

    if (currentFocus == otpFour) {
        otpThree.requestFocus();

        return;
    }
}


@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
    Log.i("ENOUGH", "onKey: " + keyCode + " " + event.getAction() + " " + KeyEvent.KEYCODE_DEL);
    if (event.getAction() == KeyEvent.ACTION_DOWN) {
        EditText currentFocus = (EditText) getCurrentFocus();
        switch (event.getKeyCode()) {
            case KeyEvent.KEYCODE_DEL: {
                if (currentFocus.getText().length() > 0) {
                    currentFocus.setText(null);
                } else {
                    goToPrevious(currentFocus);

                    EditText focused = (EditText) getCurrentFocus();
                    focused.setText(null);
                }

                return false;
            }
            case KeyEvent.KEYCODE_FORWARD:
                return true;
            case KeyEvent.KEYCODE_BACK:
                return true;
            case KeyEvent.KEYCODE_ENTER:
                return true;
            default: {
                currentFocus.setText("");
                goToNext(currentFocus);
            }
        }
    }
    return false;
}