给RecyclerView封装个Adapter吧（简单adapter）给RecyclerView封装个Adapter吧（简

单布局的Adapter：

【给RecyclerView封装个Adapter吧（简单adapter）】首先明白Adapter需要什么数据，设计接口
1. 数据
2. 上下文
3. 布局
  数据和上下文通常在构造方法里传入，所以要为布局设计个抽象方法：
  abstract public int getItemLayoutId(int viewType);
  声明上下文和数据：
  protected final List mData; protected final Context mContext; protected LayoutInflater mInflater;
  构造方法：
  protected BaseRecyclerAdapter(List data, Context context) { mData = https://www.it610.com/article/data; mContext = context; mInflater = LayoutInflater.from(context); }
  添加常用方法。。。
  完整代码：
  public abstract class BaseRecyclerAdapter extends RecyclerView.Adapter { protected final List mData; protected final Context mContext; protected LayoutInflater mInflater; protected BaseRecyclerAdapter(List data, Context context) { mData = https://www.it610.com/article/data; mContext = context; mInflater = LayoutInflater.from(context); } @Override public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { final RecyclerViewHolder holder = new RecyclerViewHolder(mContext,mInflater.inflate(getItemLayoutId(viewType), parent, false)); return holder; } @Override public void onBindViewHolder(RecyclerViewHolder holder, int position) { bindData(holder, position, mData.get(position)); } @Override public int getItemCount() { return mData.size(); } public void add(int pos, T item) { mData.add(pos, item); notifyItemInserted(pos); } public void delete(int pos) { mData.remove(pos); notifyItemRemoved(pos); } abstract public void bindData(RecyclerViewHolder holder, int position, T item); abstract public int getItemLayoutId(int viewType); }
下面编写ViewHolder
成员变量：
private SparseArray mViews; //集合类，layout里包含的View,以view的id作为key，value是view对象 private Context mContext; //上下文对象
构造方法里赋值：
super(itemView); mContext = context; mViews = new SparseArray();
返回View：
private T findViewById(int viewId) { View view = mViews.get(viewId); if (view == null) { view = itemView.findViewById(viewId); mViews.put(viewId, view); } return (T) view; }
添加常用方法：
public View getView(int viewId) { return findViewById(viewId); } public TextView getTextView(int viewId) { return (TextView) getView(viewId); } public Button getButton(int viewId) { return (Button) getView(viewId); } public ImageView getImageView(int viewId) { return (ImageView) getView(viewId); } public ImageButton getImageButton(int viewId) { return (ImageButton) getView(viewId); } public EditText getEditText(int viewId) { return (EditText) getView(viewId); } public RecyclerViewHolder setText(int viewId, String value) { TextView view = findViewById(viewId); view.setText(value); return this; } public RecyclerViewHolder setBackground(int viewId, int resId) { View view = findViewById(viewId) ; view.setBackgroundResource(resId); return this; }
一个初级的Adapter成型了。
-使用

recyclerView.setLayoutManager(new LinearLayoutManager(this)); recyclerView.setAdapter(new BaseRecyclerAdapter(datas,this) { @Override public void bindData(RecyclerViewHolder holder, int position, String item) { holder.setText(R.id.tvItemName,item); }@Override public int getItemLayoutId(int viewType) { return R.layout.item_adapter; } });