CollapsingToolbarLayout 收缩显示tilte

AppBarLayout监听滚动

最新推荐文章于 2021-12-02 16:56:55 发布

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最新推荐文章于 2021-12-02 16:56:55 发布

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原文链接：http://www.cnblogs.com/qianyukun/p/9118218.html

本文介绍如何使用AppBarLayout的addOnOffsetChangedListener方法来监听其滚动偏移，并据此改变CollapsingToolbarLayout的显示状态及标题。

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(" ");//carefull there should a space between double quote otherwise it wont work 
            isShow = false;
        }
    }
});