Android中监听软键盘的显示和隐藏

最近公司做项目又出现一个新的需求，那就是根据软键盘弹出，在它的上方出现一个布局。所以搜了一下关于软键盘显隐的内容，找到了一个方法在这里记录一下，原文链接如下：https://blog.csdn.net/wuqingsen1/article/details/84760820

首先是一个工具类

public class SoftKeyBoardListener {
    private View rootView;//activity的根视图
    int rootViewVisibleHeight;//纪录根视图的显示高度
    private OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener;
 
    public SoftKeyBoardListener(Activity activity) {
        //获取activity的根视图
        rootView = activity.getWindow().getDecorView();
 
        //监听视图树中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
        rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                //获取当前根视图在屏幕上显示的大小
                Rect r = new Rect();
                rootView.getWindowVisibleDisplayFrame(r);
                int visibleHeight = r.height();
                if (rootViewVisibleHeight == 0) {
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
 
                //根视图显示高度没有变化，可以看作软键盘显示／隐藏状态没有改变
                if (rootViewVisibleHeight == visibleHeight) {
                    return;
                }
 
                //根视图显示高度变小超过200，可以看作软键盘显示了
                if (rootViewVisibleHeight - visibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardShow(rootViewVisibleHeight - visibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
 
                //根视图显示高度变大超过200，可以看作软键盘隐藏了
                if (visibleHeight - rootViewVisibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardHide(visibleHeight - rootViewVisibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }
 
            }
        });
    }
 
    private void setOnSoftKeyBoardChangeListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        this.onSoftKeyBoardChangeListener = onSoftKeyBoardChangeListener;
    }
 
    public interface OnSoftKeyBoardChangeListener {
        void keyBoardShow(int height);
 
        void keyBoardHide(int height);
    }
 
    public void setListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        setOnSoftKeyBoardChangeListener(onSoftKeyBoardChangeListener);
    }
}

用法如下

/**
     * 添加软键盘监听
     */
    private void setSoftKeyBoardListener() {
        softKeyBoardListener = new SoftKeyBoardListener(activity);
        //软键盘状态监听
        softKeyBoardListener.setListener(new SoftKeyBoardListener.OnSoftKeyBoardChangeListener() {
            @Override
            public void keyBoardShow(int height) {
                //软键盘已经显示，做逻辑
 
            }
 
            @Override
            public void keyBoardHide(int height) {
                //软键盘已经隐藏,做逻辑
            }
        });
    }