一个简单RecyclerView复用适配器的实现
其实现方法与复用的ListView基本相似，但在实例化ViewHolder时，我在RecyclerView里使用的是单例模式，而在ListView直接判View是否为null，设置Tag来实现，但都是只创建一个ViewHolder
RecyclerView代码
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26public abstract class RecycleryAdapter<T> extends RecyclerView.Adapter {
private List<T> list;
private Context context;
private int layoutId;
public RecycleryAdapter(Context context,List<T> list,int layoutId){
this.context=context;
this.list=list;
this.layoutId=layoutId;
}
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
return RecyclerViewHolder.get(context,viewGroup,layoutId);
}
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {
fun((RecyclerViewHolder) viewHolder,list.get(i));
fun((RecyclerViewHolder) viewHolder,list.get(i),i);
}
public abstract void fun(RecyclerViewHolder viewHolder, T data);
public abstract void fun(RecyclerViewHolder viewHolder, T data,int i);
public int getItemCount() {
return list==null?0:list.size();
}
}ViewHolder代码
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36public class RecyclerViewHolder extends RecyclerView.ViewHolder{
private SparseArray< View> mViews;
private View Fview;
private static RecyclerViewHolder recyclerViewHolder;
private RecyclerViewHolder(View parent){
super(parent);
this.mViews=new SparseArray<View>();
Fview= parent;
}
public static RecyclerViewHolder get(Context context, ViewGroup viewGroup,
int layoutId){
if(recyclerViewHolder==null){
return new RecyclerViewHolder(LayoutInflater.from(context).inflate(layoutId, viewGroup, false));
}
return recyclerViewHolder;
}
public <T extends View> T getView(int viewId) {
View view = (View) mViews.get(viewId); //从 集合中找，没有找到从当前所在布局文件中找
if (view == null)
{
view = Fview.findViewById(viewId);
mViews.put(viewId, view);
}
return (T) view;
}
public void setTypeface(int id, Typeface typeface){
TextView textView=getView(id);
textView.setTypeface(typeface);
}
public void setText(int textId,String textView){
TextView tv=getView(textId);
tv.setText(textView);
}
}MainActivity代码
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52public class MainActivity extends AppCompatActivity {
private String path;
private ArrayList<String> paths;
private ArrayList<String> items;
private ArrayList<Typeface> res;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.i("ssssssssssss","1111111111111");
inti();
}
public void inti(){
items=new ArrayList<String>();
paths=new ArrayList<String>();
path="/system/fonts/";
final File f = new File(path);
File[] files = f.listFiles();// 列出所有文件
if(files != null){
int count = files.length;// 文件个数
for (int i = 0; i < count; i++) {
File file = files[i];
items.add(file.getName());
paths.add(file.getPath());
}
}
res=new ArrayList<Typeface>();
for (int i=0;i<paths.size();i++){
res.add(Typeface.createFromFile(paths.get(i)));
}
RecyclerView recyclerView=(RecyclerView)findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(new RecycleryAdapter<Typeface>(this,res,R.layout.item) {
@Override
public void fun(RecyclerViewHolder viewHolder, Typeface data) {
}
@Override
public void fun(RecyclerViewHolder viewHolder, Typeface data, int i) {
viewHolder.setTypeface(R.id.textView,data);
viewHolder.setTypeface(R.id.textView1,data);
viewHolder.setText(R.id.textView1,items.get(i));
viewHolder.setText(R.id.textView,"北京上海40$50°ABCabc");
}
});
}
}
其实基本上和ListView中的实现是差不多，区别就是ViewHolder的实现，单例模式，需要理解的就是ViewHolder中的代码