仅在折叠时显示 CollapsingToolbarLayout 标题

问题描述

我尝试了 setExpandedTitleColor 和 setCollapsedTitleColor(在透明和透明之间切换)，但没有成功.我也看不到任何内置方法可以满足我的要求.

I've tried setExpandedTitleColor and setCollapsedTitleColor (switching to and from transparent) with no luck. I can't see any built in methods that'll do what I'm looking for, either.

我只想在 CollapsingToolbarLayout 完全折叠时显示标题，否则我需要隐藏它.

I only want to show the title when the CollapsingToolbarLayout is fully collapsed, otherwise, I need it hidden.

有什么提示吗?

推荐答案

您可以将 OnOffsetChangedListener 添加到 AppBarLayout 来确定何时折叠 CollapsingToolbarLayout或展开并设置它的标题.

You can add OnOffsetChangedListener to AppBarLayout to determine when CollapsingToolbarLayout is collapsed or expanded and set it's title.

final CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsingToolbarLayout);
AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.appBarLayout);
appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
    boolean isShow = true;
    int scrollRange = -1;

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
        if (scrollRange == -1) {
            scrollRange = appBarLayout.getTotalScrollRange();
        }
        if (scrollRange + verticalOffset == 0) {
            collapsingToolbarLayout.setTitle("Title");
            isShow = true;
        } else if(isShow) {
            collapsingToolbarLayout.setTitle(" ");//careful there should a space between double quote otherwise it wont work
            isShow = false;
        }
    }
});

科特林

var isShow = true
var scrollRange = -1
appBarLayout.addOnOffsetChangedListener(AppBarLayout.OnOffsetChangedListener { barLayout, verticalOffset ->
    if (scrollRange == -1){
        scrollRange = barLayout?.totalScrollRange!!
    }
    if (scrollRange + verticalOffset == 0){
        collapsingToolbarLayout.title = "Title Collapse"
        isShow = true
    } else if (isShow){
        collapsingToolbarLayout.title = " " //careful there should a space between double quote otherwise it wont work
        isShow = false
    }
})

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