Android：检测软键盘打开

当软键盘打开时，我想要一个滚动视图向下滚动到底部。

为此我可以使用： fullScroll(View.FOCUS_DOWN);

但是，在软键盘打开事件触发后如何触发该命令？

这是我的解决方案：

1/ 简单的界面

public interface KeyboardVisibilityListener {
    void onKeyboardVisibilityChanged(boolean keyboardVisible);
}

2/ 实用方法（将其放在您想要的位置，例如在名为的类中KeyboardUtil)

public static void setKeyboardVisibilityListener(Activity activity, KeyboardVisibilityListener keyboardVisibilityListener) {
    View contentView = activity.findViewById(android.R.id.content);
    contentView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        private int mPreviousHeight;

        @Override
        public void onGlobalLayout() {
            int newHeight = contentView.getHeight();
            if (mPreviousHeight != 0) {
                if (mPreviousHeight > newHeight) {
                    // Height decreased: keyboard was shown
                    keyboardVisibilityListener.onKeyboardVisibilityChanged(true);
                } else if (mPreviousHeight < newHeight) {
                    // Height increased: keyboard was hidden
                    keyboardVisibilityListener.onKeyboardVisibilityChanged(false);
                } else {
                    // No change
                }
            }
            mPreviousHeight = newHeight;
        }
    });
}

3/ 以这种方式从 Activity 中使用（一个好地方是 onCreate）：

KeyboardUtil.setKeyboardVisibilityListener(this, mKeyboardVisibilityListener);