RecyclerView的使用技巧

2015-09-21 控件

RecyclerView(ListView)在一个App中出现的频率还是非常高的，它是官方出的一个用来替代ListView、GridView的控件，下面简单的介绍一下RecyclerView中一些简单的使用技巧。

官方

官方网址(需要翻墙)

https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html

官方给出的一句话解释是：

A flexible view for providing a limited window into a large data set.

Gradle

compile ‘com.android.support:recyclerview-v7:+’

建议搭配cardView使用

compile ‘com.android.support:cardview-v7:+’

使用

RecyclerView使用起来很简单，但相比于ListView来说，使用的方法还是有一点改变的。

<android.support.v7.widget.RecyclerView 注意V7兼容包名 否则只能api 21才能用
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

RecyclerView recyclerView = (RecyclerView)findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));//线性显示(默认纵向显示) 类似于ListView
// recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false));//线性显示(横向显示)
// recyclerView.setLayoutManager(new GridLayoutManager(this, 2));//线性宫格显示 类似于GridView
// recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, OrientationHelper.VERTICAL));//瀑布流显示

recyclerView.setAdapter(new RecyclerViewAdapter(this,data));

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
    private Context context;
    private List<Post> posts;

    public RecyclerViewAdapter(Context context, List<Post> posts) {
        this.context = context;
        this.posts = posts;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_post, parent,false);
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder vh, int position) {
        vh.contentTv.setText(posts.get(position).getContent());
    }

    @Override
    public int getItemCount() {
        return posts.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView contentTv;
        public ViewHolder(View itemView) {
            super(itemView);
            contentTv = (TextView) itemView.findViewById(R.id.content_post_tv);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //你的点击事件
                }
            });
        }
    }
}

做到这里就算完成了。

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这些是简单的使用，不过我们可以写一个万能的Adapter来适配每一个RecyclerView，请往下看

public class RVHolder  extends RecyclerView.ViewHolder {


    private ViewHolder viewHolder;

    public RVHolder(View itemView) {
        super(itemView);
        viewHolder=ViewHolder.getViewHolder(itemView);

    }


    public ViewHolder getViewHolder() {
        return viewHolder;
    }
}

public abstract class AutoRVAdapter extends RecyclerView.Adapter<RVHolder> {
    public final static Integer VIEW_ITEM = 101;
    public final static Integer VIEW_PROG = 100;
    public List<?> list;

    public Context context;

    public AutoRVAdapter(Context context, List<?> list) {
        this.list = list;
        this.context = context;
    }

    @Override
    public RVHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(onCreateViewLayoutID(viewType),parent,false);

        return new RVHolder(view);
    }

    public abstract int onCreateViewLayoutID(int viewType);


    @Override
    public void onViewRecycled(final RVHolder holder) {
        super.onViewRecycled(holder);
    }

    @Override
    public void onBindViewHolder(final RVHolder holder, final int position) {

        onBindViewHolder(holder.getViewHolder(), position);
        if (onItemClickListener != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onItemClickListener.onItemClick(null, v, holder.getPosition(), holder.getItemId());
                }
            });
        }

    }

    public abstract void onBindViewHolder(ViewHolder holder, int position);

    @Override
    public int getItemCount() {
        return list.size();
    }

    private AdapterView.OnItemClickListener onItemClickListener;

    public AdapterView.OnItemClickListener getOnItemClickListener() {
        return onItemClickListener;
    }

    public void setOnItemClickListener(AdapterView.OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

public class ViewHolder {
    private SparseArray<View> viewHolder;
    private View view;

    public static  ViewHolder getViewHolder(View view){
        ViewHolder viewHolder = (ViewHolder) view.getTag();
        if (viewHolder == null) {
            viewHolder = new ViewHolder(view);
            view.setTag(viewHolder);
        }
        return viewHolder;
    }
    private ViewHolder(View view) {
        this.view = view;
        viewHolder = new SparseArray<View>();
        view.setTag(viewHolder);
    }
    public <T extends View> T get(int id) {
        View childView = viewHolder.get(id);
        if (childView == null) {
            childView = view.findViewById(id);
            viewHolder.put(id, childView);
        }
        return (T) childView;
    }

    public View getConvertView() {
        return view;
    }

    public TextView getTextView(int id) {

        return get(id);
    }
    public Button getButton(int id) {

        return get(id);
    }

    public ImageView getImageView(int id) {
        return get(id);
    }

    public void setTextView(int  id,CharSequence charSequence){
        getTextView(id).setText(charSequence);
    }
}

以后我们只要集成AutoRVAdapter就好了，简单方便。

public class RecyclerViewAdapter extends AutoRVAdapter{
    public RecyclerViewAdapter(Context context, List<?> list) {
        super(context, list);
    }
    @Override
    public int onCreateViewLayoutID(int viewType) {
        return R.layout.item_appointment;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Post post = (Post) list.get(position);
        holder.setTextView(R.id.text,post.getName());
    }
}

注意的问题

RecyclerView嵌套在ScrollView里面是一行都不显示的(ListView显示一行)这里需要重写LayoutManager，具体可google
在5.0以上的手机 RecyclerView嵌套在ScrollView 重写LayoutManager后 RecyclerView的滑动惯性会消失，此时可重写ScrollView即可
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官方

使用

推荐

注意的问题