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关于VLayout不支持横向线性布局的个人解决方案，有需要的进来看看
我觉得横向线性布局在开发中还是一个很常见的需求，VLayout官方不提供这个功能导致要做很多处理，如果处理地不好的话好会导致这部分Adapter不能复用，这对于我这种代码洁癖的人来说还是很苦恼的。 经过再三考虑，我使用了装饰者模式封装了一个横向布局Adapter，外界只需要传入真实的Adapter即可实现横向布局，以下为代码 ` public class VLayoutHorizontalAdapter extends DelegateAdapter.Adapter{
private RecyclerView.Adapter adapter;
private int spanCount = 1; //横向的列，填1相当于横向线性布局，根据自己的需求更改这个值
private RecyclerView.ItemDecoration decoration;
public VLayoutHorizontalAdapter(RecyclerView.Adapter adapter) {
this.adapter = adapter;
}
public VLayoutHorizontalAdapter(RecyclerView.Adapter adapter, int spanCount) {
this.adapter = adapter;
this.spanCount = spanCount;
}
public VLayoutHorizontalAdapter(RecyclerView.Adapter adapter, int spanCount, RecyclerView.ItemDecoration decoration) {
this.adapter = adapter;
this.spanCount = spanCount;
this.decoration = decoration;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
RecyclerView rv = new RecyclerView(viewGroup.getContext());
rv.setLayoutManager(new GridLayoutManager(viewGroup.getContext(),spanCount,RecyclerView.HORIZONTAL,false));
if (decoration != null) rv.addItemDecoration(decoration);
rv.setAdapter(adapter);
return new BaseViewHolder(rv,viewType);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
adapter.notifyDataSetChanged();
}
@Override
public int getItemCount() {
return 1;
}
@Override
public LayoutHelper onCreateLayoutHelper() {
return new LinearLayoutHelper();
}
} `
使用时只需要如下调用 delegateAdapter.addAdapter(new VLayoutHorizontalAdapter(new ReallyAdapter()));
PS：外界不需要持有ReallyAdapter引用，因为VLayoutHorizontalAdapter已经做了处理，更新VLayoutHorizontalAdapter即可更新ReallyAdapter。还有一点就是DelegateAdapter.Adapter继承于RecyclerView.Adapter，具体好处自己体会
难道不会卡顿么，这样添加横向布局
官方Demo中就是这样添加的，只是官方是直接嵌套使用，这样会导致Adapter的复用性太差，我才做了一层封装。日后如果官方出了横向Adapter，可以直接修改继承的父类，切换起来也方便
大佬 我折腾一下午了，用你这个 recyclerview 死活不显示 会是什么情况呢？ 换成什么textview 之类的就没问题
你有没有通知VLayoutHorizontalAdapter 更新？
//横向的adapter
HomeHorizontalAdapter homeHorizontalAdapter = new HomeHorizontalAdapter(list);
//
VLayoutHorizontalAdapter vLayoutHorizontalAdapter = new VLayoutHorizontalAdapter(homeHorizontalAdapter);
adapter.addAdapter(vLayoutHorizontalAdapter);
}
//这个adapter是DelegateAdapter
adapter.notifyDataSetChanged();
//横向的adapter HomeHorizontalAdapter homeHorizontalAdapter = new HomeHorizontalAdapter(list); // VLayoutHorizontalAdapter vLayoutHorizontalAdapter = new VLayoutHorizontalAdapter(homeHorizontalAdapter);
adapter.addAdapter(vLayoutHorizontalAdapter); } //这个adapter是DelegateAdapter adapter.notifyDataSetChanged();
`//横向的adapter HomeHorizontalAdapter homeHorizontalAdapter = new HomeHorizontalAdapter(list); // VLayoutHorizontalAdapter vLayoutHorizontalAdapter = new VLayoutHorizontalAdapter(homeHorizontalAdapter); adapter.addAdapter(vLayoutHorizontalAdapter); }
//更新的时候不可以使用DelegateAdapter，要使用具体的子Adapter
vLayoutHorizontalAdapter .notifyDataSetChanged();`
for (int x = 0; x < 20; i++) { for (int j = 0; j < 10; j++) { list.add("xxxxx"); } //横向的adapter HomeHorizontalAdapter homeHorizontalAdapter = new HomeHorizontalAdapter(list); // VLayoutHorizontalAdapter vLayoutHorizontalAdapter = new VLayoutHorizontalAdapter(homeHorizontalAdapter); adapter.addAdapter(vLayoutHorizontalAdapter); } //这个adapter是DelegateAdapter adapter.notifyDataSetChanged();
//横向的adapter HomeHorizontalAdapter homeHorizontalAdapter = new HomeHorizontalAdapter(list); // VLayoutHorizontalAdapter vLayoutHorizontalAdapter = new VLayoutHorizontalAdapter(homeHorizontalAdapter); adapter.addAdapter(vLayoutHorizontalAdapter); }
//这个adapter是DelegateAdapter adapter.notifyDataSetChanged();
//更新的时候不可以使用DelegateAdapter，要使用具体的子Adapter vLayoutHorizontalAdapter .notifyDataSetChanged();`
//横向的adapter HomeHorizontalAdapter homeHorizontalAdapter = new HomeHorizontalAdapter(list); // VLayoutHorizontalAdapter vLayoutHorizontalAdapter = new VLayoutHorizontalAdapter(homeHorizontalAdapter); adapter.addAdapter(vLayoutHorizontalAdapter); }
//这个adapter是DelegateAdapter adapter.notifyDataSetChanged();
//横向的adapter HomeHorizontalAdapter homeHorizontalAdapter = new HomeHorizontalAdapter(list); // VLayoutHorizontalAdapter vLayoutHorizontalAdapter = new VLayoutHorizontalAdapter(homeHorizontalAdapter); adapter.addAdapter(vLayoutHorizontalAdapter); } //更新的时候不可以使用DelegateAdapter，要使用具体的子Adapter vLayoutHorizontalAdapter .notifyDataSetChanged();
``
更新 子 adapter 也无效，但是把recyclerview 换成其他控件 就没问题
最外层的RecyclerView是不是MatchParent
我再添加横向recyclerview 之前还添加了其他 layouthelp SingleLayoutHelper 都能正常显示 但是到了 添加 横向的这里 就显示不了 GridLayoutHelper我用过 没问题。
public class VLayoutHorizontalAdapter extends DelegateAdapter.Adapter {
private RecyclerView.Adapter adapter;
private RecyclerView.ItemDecoration decoration;
public VLayoutHorizontalAdapter(RecyclerView.Adapter adapter) {
this.adapter = adapter;
}
public VLayoutHorizontalAdapter(RecyclerView.Adapter adapter,RecyclerView.ItemDecoration decoration) {
this.adapter = adapter;
this.decoration = decoration;
}
@Override
public LayoutHelper onCreateLayoutHelper() {
return new LinearLayoutHelper();
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
RecyclerView rv = new RecyclerView(parent.getContext());
rv.setLayoutManager(new GridLayoutManager(parent.getContext(),1,RecyclerView.HORIZONTAL,false));
if (decoration != null) rv.addItemDecoration(decoration);
rv.setAdapter(adapter);
return new RecyclerView.ViewHolder(rv){};
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
adapter.notifyDataSetChanged();
}
@Override
public int getItemCount() {
return 1;
}
}
把 onCreateViewHolder 中的 recyclerview 替换成 其他控件 也没问题。
你把你的HomeHorizontalAdapter 拿出来我再看看
public class HomeHorizontalAdapter extends BaseQuickAdapter<String, BaseViewHolder> {
public HomeHorizontalAdapter(List<String> data) {
super(R.layout.adapter_popular_item, data);
}
@Override
protected void convert(BaseViewHolder helper, String s) {
helper.setText(R.id.name_tv, s);
}
}