使用DividerItemDecoration在回收器视图中隐藏一些项目分隔符

implementation 'androidx.recyclerview:recyclerview:1.2.1'

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);

public class CustomDividerItemDecoration extends RecyclerView.ItemDecoration {
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        
        // 根据需要隐藏某些项目的分隔符
        if (parent.getChildAdapterPosition(view) == 0) {
            outRect.set(0, 0, 0, 0); // 隐藏第一个项目的分隔符
        } else if (parent.getChildAdapterPosition(view) == parent.getAdapter().getItemCount() - 1) {
            outRect.set(0, 0, 0, 0); // 隐藏最后一个项目的分隔符
        } else {
            outRect.set(0, 0, 0, 2); // 显示其他项目的分隔符，这里设置为2px的高度
        }
    }
}

RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);

DividerItemDecoration dividerItemDecoration = new CustomDividerItemDecoration();
recyclerView.addItemDecoration(dividerItemDecoration);