键盘显隐监听

港控/mmm° 2021-11-01 20:04 370阅读 0赞

/**
     * 类描述：键盘显隐监听<br/>
     * 创建人：吴冬冬<br/>
     * 创建时间：2019/8/12 15:26 <br/>
     */
    public class KeyBoardListener implements ViewTreeObserver.OnGlobalLayoutListener {
    
        private final int KEY_BOARD_HEIGHT = IntEKt.dp2px(70);
    
        public interface OnKeyBoardChangeListener {
            void keyBoardShow();
    
            void keyBoardHide();
        }
    
        /**
         * activity 根视图
         */
        private final View mDecorView;
        /**
         * 根视图 高度
         */
        private int mDecorViewHeight;
    
        private OnKeyBoardChangeListener mListener;
    
        public static KeyBoardListener setListener(AppCompatActivity activity, OnKeyBoardChangeListener listener) {
            KeyBoardListener keyBoardListener = new KeyBoardListener(activity);
            keyBoardListener.setListener(listener);
            return keyBoardListener;
        }
    
        public void removeListener() {
            mDecorView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            mListener = null;
        }
    
        private KeyBoardListener(AppCompatActivity activity) {
            //获取根视图
            mDecorView = activity.getWindow().getDecorView();
            //监听视图种全局布局发生改变 或者 视图树中的某个视图的可视状态发生改变
            mDecorView.getViewTreeObserver().addOnGlobalLayoutListener(this);
        }
    
        public void setListener(OnKeyBoardChangeListener listener) {
            mListener = listener;
        }
    
        @Override
        public void onGlobalLayout() {
            //获取当前根视图在屏幕上显示的大小
            Rect rect = new Rect();
            mDecorView.getWindowVisibleDisplayFrame(rect);
            int height = rect.height();
            Logger.d("123===", "当前屏幕高度：" + height);
            if (height == 0) {
                mDecorViewHeight = height;
                return;
            }
    
            //根视图高度没有变化，可以看作 键盘 显示/隐藏 没有改变
            if (mDecorViewHeight == height) {
                return;
            }
    
            //根视图显示高度 变小 超过 70dp，看作键盘显示
            if (mDecorViewHeight - height > KEY_BOARD_HEIGHT) {
                mDecorViewHeight = height;
                if (mListener != null) {
                    mListener.keyBoardShow();
                }
                return;
            }
    
            //根视图显示高度 变大 超过 70dp， 看作键盘隐藏
            if (height - mDecorViewHeight > KEY_BOARD_HEIGHT) {
                mDecorViewHeight = height;
                if (mListener != null) {
                    mListener.keyBoardHide();
                }
                return;
            }
        }
    }