Android:检测软键盘打开

Question

当软键盘打开时，我希望 ScrollView 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？

Answer 1

这是我的解决方案:

1/一个简单的界面

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

2/一个实用方法(把它放在你想要的地方，例如在一个名为 KeyboardUtil 的类中)

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(一个好地方在 onCreate):

KeyboardUtil.setKeyboardVisibilityListener(this, mKeyboardVisibilityListener);