在RecyclerView中,所有的项(Item)共享同一个布局(Layout),因此不能直接为RecyclerView的项设置不同的Drawables。不过,你可以使用RecyclerView的Adapter来实现不同项的不同Drawables。
以下是一个示例代码,演示如何使用RecyclerView的Adapter来为不同项设置不同的Drawables:
public class MyAdapter extends RecyclerView.Adapter {
private List itemList;
public static class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public ViewHolder(View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.item_image);
}
}
public MyAdapter(List itemList) {
this.itemList = itemList;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
MyItem item = itemList.get(position);
holder.imageView.setImageDrawable(item.getDrawable());
}
@Override
public int getItemCount() {
return itemList.size();
}
}
public class MyItem {
private Drawable drawable;
public MyItem(Drawable drawable) {
this.drawable = drawable;
}
public Drawable getDrawable() {
return drawable;
}
}
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private MyAdapter mAdapter;
private List itemList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化数据
itemList = new ArrayList<>();
itemList.add(new MyItem(getResources().getDrawable(R.drawable.drawable1)));
itemList.add(new MyItem(getResources().getDrawable(R.drawable.drawable2)));
itemList.add(new MyItem(getResources().getDrawable(R.drawable.drawable3)));
// 初始化RecyclerView和Adapter
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new MyAdapter(itemList);
recyclerView.setAdapter(mAdapter);
}
}
在这个示例中,我们通过自定义的Adapter为每个项设置不同的Drawable。在Adapter的onBindViewHolder()
方法中,我们根据项的位置从数据模型中获取Drawable,并设置给ViewHolder中的ImageView。
这样,你就可以为RecyclerView的项设置不同的Drawables了。