java - 如何为 RecyclerView 设置 BaseAdapter?
问题描述
每当我需要实现自定义ListView
或GridView
. 我总是使用这样的BaseAdapter
类:
public class CustomFlowerGridViewAdapter extends BaseAdapter {
private HashMap<String, String> mFlowerFeed = new HashMap<>();
private Context mContext;
static LayoutInflater mFlowerInflater = null;
CustomFlowerGridViewAdapter(Context context, ArrayList<HashMap<String, String>> data) {
super();
this.mContext = context;
MainActivity.flowerArrayFeedList = data;
mFlowerInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return MainActivity.flowerArrayFeedList.size();
}
@Override
public Object getItem(int i) {
return MainActivity.flowerArrayFeedList.size();
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
final ViewHolder holder;
if(view == null){
view = mFlowerInflater.inflate(R.layout.flower_grid_row, viewGroup, false);
holder = new ViewHolder();
holder.name = (TextView) view.findViewById(R.id.mainGridName);
view.setTag(holder);
mFlowerFeed = MainActivity.flowerArrayFeedList.get(i);
mFlowerImage = MainActivity.flowerArrayImageList.get(i);
}
else{
holder = (ViewHolder) view.getTag();
mFlowerFeed = MainActivity.flowerArrayFeedList.get(i);
mFlowerImage = MainActivity.flowerArrayImageList.get(i);
}
holder.name.setText(mFlowerFeed.get("name"));
return view;
}
private class ViewHolder {
TextView name
}
}
但是,现在我正在尝试实现一个Horizontal ListView
. 在做了一些研究之后,我发现实现水平 ListView 的“正确”方法是使用RecyclerView
. 这就是我的MainActivity
CustomFlowerGridViewAdapter customFlowerGridViewAdapter = new CustomFlowerGridViewAdapter(MainActivity.this, flowerArrayFeedList);
flowersGrid.setAdapter(customFlowerGridViewAdapter);
问题是当我尝试设置适配器时。
如何将 BaseAdapter 设置为 RecyclerView?
解决方案
你没有。RecylerViews 接受另一种适配器,不同于 ListView 中的适配器。带有字符串列表的适配器的简单示例:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private String[] mDataset;
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView mTextView;
public ViewHolder(TextView v) {
super(v);
mTextView = v;
}
}
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
TextView v = (TextView) LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
...
ViewHolder vh = new ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.mTextView.setText(mDataset[position]);
}
@Override
public int getItemCount() {
return mDataset.length;
}
}
这个可以在docs中找到。因此,您需要实现一个 ViewHolder 类,您的适配器将使用该类。您的适配器需要扩展 RecyclerView.Adapter。
要将列表设置为水平的,您需要在回收站视图中设置一个 LinearLayourManager 并设置 Horizontal 属性。
LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(layoutManager);
MyAdapter adapter = new MyAdapter(dataset);
recyclerView.setAdapter(adapter);
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