问题描述

关于如何以编程方式显示/隐藏软键盘有很多问题.

There are many questions related to how to programatically show/hide the soft keyboard.

但是，众所周知，android 后退按钮会导致键盘被关闭.有没有办法防止用户按下后退按钮关闭键盘?

However, as we all know the android back button will cause the keyboard to be dismissed. Is there a way to prevent the user from dismissing the keyboard with a back button press?

我试图捕获后退按钮，但是当键盘显示时，我的活动中的 onKeyDown 不会在按下后退键并且软键盘可见时被调用.

I tried to capture the back button, but when the keyboard is displayed onKeyDown in my activity is not invoked when the back key is pressed and soft keyboard is visible.

任何建议将不胜感激.

推荐答案

我找到了解决方案:

public class KeyBoardHolder extends EditText {
    public KeyBoardHolder(Context context) {
        super(context);
    }

    public KeyBoardHolder(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public KeyBoardHolder(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public KeyBoardHolder(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public boolean onKeyPreIme(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            return true;
        }
        return false;
    }
}

这可以防止键盘被返回按钮关闭.

This prevents keyboard from being closed by back button.

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