RecycleView使用和adapter基本封装

来源：互联网发布：sql 删除默认值约束编辑：程序博客网时间：2024/04/29 05:57

一、RecycleView的使用

1、纵向列表

//泛型指定为MyAdapter的内部类class MyAdapter extends  RecyclerView.Adapter<MyAdapter.ViewHolder>{    List<String> list = new ArrayList<>();    public MyAdapter(List<String> list){        this.list = list;    }    //继承于RecyclerView.ViewHolder    class ViewHolder extends RecyclerView.ViewHolder{        TextView textView;        //构造中传入一个view的参数        ViewHolder(View view){            super(view);            textView = (TextView) view.findViewById(R.id.textView2);        }    }    //创建一个ViewHolder实例，将布局view传入其构造中    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_recyler_item,parent,false);        ViewHolder holder = new ViewHolder(view);        return holder;    }    //子item的数量    @Override    public int getItemCount() {        return list.size();    }    //对子item数据进行赋值    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        holder.textView.setText(list.get(position));    }}

        recyclerView = (RecyclerView)findViewById(R.id.id_recycler);        //用于指定RecyclerView的布局方式，这里指定线性布局        recyclerView.setLayoutManager(new LinearLayoutManager(this));        MyAdapter adapter = new MyAdapter(list);        recyclerView.setAdapter(adapter);
2、横向列表

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);        linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);        recyclerView.setLayoutManager(linearLayoutManager);
3、网格列表

        GridLayoutManager gridLayoutManager = new GridLayoutManager(this,4);//第二个参数为列数        recyclerView.setLayoutManager(gridLayoutManager);
4、瀑布流

        //第一个参数为列数，第二个为排列方向        StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);        recyclerView.setLayoutManager(manager);
二、BaseAdapter

1、设置点击监听

/** * RecyclerView 点击条目的监听 */public interface OnItemClickListener<T> {    void onItemClick(ViewGroup parent, View view,T t, int position);}
2、继承于ViewHolder

public class ViewHolder extends RecyclerView.ViewHolder {    private SparseArray<View> mViews;    private Context mContext;    private View mConverView;    public ViewHolder(Context context, View itemView) {        super(itemView);        mContext=context;        mConverView = itemView;        mViews = new SparseArray<View>();    }    //创建ViewHolder实例    public static ViewHolder get(Context context,ViewGroup parent,int layoutId){        View itemView = LayoutInflater.from(context).inflate(layoutId,parent,false);        ViewHolder holder = new ViewHolder(context,itemView);        return holder;    }    //获取组件    public <T extends View> T getView(int viewId){        View view = mViews.get(viewId);        if (view==null){            view = mConverView.findViewById(viewId);            mViews.put(viewId,view);        }        return (T)view;    }    //TextView设置文字    public ViewHolder setText(int viewId, String text){        TextView tv = getView(viewId);        tv.setText(text);        return this;    }    //TextView设置颜色    public ViewHolder setText(int viewId, int textColor){        TextView tv = getView(viewId);        tv.setTextColor(textColor);        return this;    }    //ImageView设置图片    public ViewHolder setImageResource(int viewId, int resId){        ImageView view = getView(viewId);        view.setImageResource(resId);        return this;    }    //ImageView设置图片    public ViewHolder setImageResource(int viewId, String imageUrl){        ImageView view = getView(viewId);        //抽取出网络图片加载的工具类        BaseImageUtil.ImageLoader(mContext,imageUrl,view);        return this;    }    //ImageView设置背景    public ViewHolder setBackgroundColor(int viewId, int color) {        View view = getView(viewId);        view.setBackgroundColor(color);        return this;    }    //是否可见    public ViewHolder setVisible(int viewId, boolean visible) {        View view = getView(viewId);        view.setVisibility(visible ? View.VISIBLE : View.GONE);        return this;    }    //item内控件点击事件    public ViewHolder setOnClickListener(int viewId,                                         View.OnClickListener listener){        View view = getView(viewId);        view.setOnClickListener(listener);        return this;    }    //获取converview    public View getConverView(){        return mConverView;    }}
3、BaseAdapter

public abstract class BaseAdapter<T> extends RecyclerView.Adapter<ViewHolder> {    protected Context mContext;    protected List<T> mDatas; //数据源    private int mLayoutId;    protected OnItemClickListener mOnItemClickListener; //点击监听    public void setOnItemClickListener(OnItemClickListener onItemClickListener){        this.mOnItemClickListener = onItemClickListener;    }    public BaseAdapter(Context context                                                                                      , int layoutId){        mContext = context;        mLayoutId = layoutId;    }    public BaseAdapter(Context context, int layoutId, List<T> datas){        mContext = context;        mDatas = datas;        mLayoutId = layoutId;    }    @Override    public ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {        final ViewHolder holder = ViewHolder.get(mContext,parent,mLayoutId);        setClickListener(parent, holder);        return holder;    }    //设置点击事件    protected void setClickListener(final ViewGroup parent, final ViewHolder holder) {        //设置监听        holder.getConverView().setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (mOnItemClickListener!=null){                    int position = holder.getAdapterPosition();                    mOnItemClickListener.onItemClick(parent,v,mDatas.get(position),position);                }            }        });    }    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        convert(holder,mDatas.get(position),position);    }    @Override    public int getItemCount() {        if (mDatas!=null&&mDatas.size()>0){            return mDatas.size();        }        return 0;    }    /**     * 必须要实现的查找控件和赋值的操作     * @param holder     * @param t   数据     * @param position  索引     */    public abstract void convert(ViewHolder holder, T t, int position);    //设置数据源    public void setData(List<T> datas){        mDatas = datas;    }    //清除所有数据    public void removeAll(){        if (mDatas!=null){            mDatas.clear();        }    }    //添加数据    public void addDatas(List<T> newDatas){        if (mDatas!=null){            mDatas.addAll(newDatas);        }    }}

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