禁止AppBarLayout滑动_appbarlayou禁止展开-优快云博客

本文链接：https://blog.youkuaiyun.com/yaosizy/article/details/70231359

本文介绍了一个方法用于控制Android应用中AppBarLayout组件的滚动行为。通过设置一个布尔值，可以禁止或允许AppBarLayout的拖动。当禁止拖动时，会移除全局布局监听器并设置DragCallback为不允许拖动。

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 private void forbidAppBarScroll(boolean forbid) {
        if (forbid == forbidAppBarScroll) {
            return;
        }
        if (forbid) {
            forbidAppBarScroll = true;
            if (ViewCompat.isLaidOut(appBar)) {
                setAppBarDragCallback(new AppBarLayout.Behavior.DragCallback() {

                    @Override public boolean canDrag(@NonNull AppBarLayout appBarLayout) {
                        return false;
                    }
                });
            } else {
                appBar.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override public void onGlobalLayout() {
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                            appBar.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                        } else {
                            appBar.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                        }
                        setAppBarDragCallback(new AppBarLayout.Behavior.DragCallback() {

                            @Override public boolean canDrag(@NonNull AppBarLayout appBarLayout) {
                                return false;
                            }
                        });
                    }
                });
            }
        } else {
            forbidAppBarScroll = false;
            if (ViewCompat.isLaidOut(appBar)) {
                setAppBarDragCallback(null);
            } else {
                appBar.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override public void onGlobalLayout() {
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                            appBar.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                        } else {
                            appBar.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                        }
                        setAppBarDragCallback(null);
                    }
                });
            }
        }
    }

    private void setAppBarDragCallback(AppBarLayout.Behavior.DragCallback dragCallback) {
        CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) appBar.getLayoutParams();
        AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior();
        behavior.setDragCallback(dragCallback);
    }