java 折叠工具栏在“折叠”工具栏中添加viewFlipper

Posted 2021-05-08

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

            @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                if (scrollRange == -1) {
                    scrollRange = appBarLayout.getTotalScrollRange();
                }
                if (scrollRange + verticalOffset == 0) {
                    collapsingToolbarLayout.setTitle("  ");
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                        collapsingToolbarLayout.setCollapsedTitleGravity(View.TEXT_ALIGNMENT_CENTER);
                    }
                    imageView1.setVisibility(View.GONE);
                    isShow = true;
                }
                else if(isShow) {
                    // when toolbar is small
                    collapsingToolbarLayout.setTitle("  "); //carefull there should a space between double quote otherwise it wont work

                    collapsingToolbarLayout.setCollapsedTitleGravity(View.TEXT_ALIGNMENT_CENTER);
                    isShow = false;
                }
            }
        });