java 仅在折叠工具栏时显示CollapsibleToolbar标题。

Posted 2021-05-08

// From - http://stackoverflow.com/a/32724422/906577
...

final CollapsingToolbarLayout collapsingToolbar =
                    (CollapsingToolbarLayout) mRootView.findViewById(R.id.collapsing_toolbar);
  AppBarLayout appBarLayout = (AppBarLayout) mRootView.findViewById(R.id.appbar);
  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(title);
              isShow = true;
          } else if (isShow) {
              collapsingToolbar.setTitle("");
              isShow = false;
          }
      }
  });
  ...