安卓吸顶效果

当列表滑动时，图片逐渐消失，toolBar悬停在头部。

public class MainActivity extends AppCompatActivity {
    RecyclerView recyclerView;
    private List list;
    private NormalAdapter normalAdapter;
    private LinearLayoutManager linearLayoutManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView=findViewById(R.id.goodsRecyclerView);
        initList();
        initView();
    }

    private void initList() {
        list = new ArrayList<>();
        for (int i = 1; i <= 100; i++) {
            list.add(i + "");
        }
    }

    private void initView() {
        linearLayoutManager = new LinearLayoutManager(this);
        normalAdapter = new NormalAdapter(list);

        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setNestedScrollingEnabled(false);
        recyclerView.setAdapter(normalAdapter);
    }
}

demo地址