在Android Studio中隐藏滚动活动标题

问题描述

我创建了滚动活动.

我想隐藏此活动标题(Banglalink最新优惠).

I want to hide this activity title (Banglalink Latest Offers).

但是

我想在此阶段显示活动标题(Banglalink最新优惠).

I want to show activity title at this stage (Banglalink Latest Offers).

有可能吗?如果是，怎么办?

Is it possible to do?If yes, how?

推荐答案

从onCreate()

initCollapsingToolbar();

定义方法

private void initCollapsingToolbar() {
    final CollapsingToolbarLayout collapsingToolbar =
            (CollapsingToolbarLayout) findViewById(R.id.toolbar_layout);
    collapsingToolbar.setTitle(" ");
    AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.app_bar);
    appBarLayout.setExpanded(true);

    // hiding & showing the title when toolbar expanded & collapsed
    appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
        boolean isShow = false;
        int scrollRange = -1;

        @Override
        public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
            if (scrollRange == -1) {
                scrollRange = appBarLayout.getTotalScrollRange();
            }
            if (scrollRange + verticalOffset == 0) {
                collapsingToolbar.setTitle("Your app title");
                isShow = true;
            } else if (isShow) {
                collapsingToolbar.setTitle(" ");
                isShow = false;
            }
        }
    });
}

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