RecyclerView

RecyclerView

超级ListView，需要support:recyclerview

1、在build.gradle中导入support包

    compile 'com.android.support:recyclerview-v7:25.0.0'

2、在xml中布局

    <android.support.v7.widget.RecyclerView        android:id="@+id/m_recycler"        android:layout_width="match_parent"        android:layout_height="match_parent" />

3、java中定义适配器

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ItemHolder> {    private List<String> list;    private LayoutInflater mInflater;    public MyAdapter(Context context, List<String> list) {        this.list = list;        mInflater = LayoutInflater.from(context);    }    //对数据显示需要创建的视图    @Override    public ItemHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View layout = mInflater.inflate(R.layout.item_layout, null);        return new ItemHolder(layout);    }    //数据和视图绑定（处理显示）    @Override    public void onBindViewHolder(ItemHolder holder, int position) {        String s = list.get(position);        holder.tv.setText(s);    }    //配置显示的总个数    @Override    public int getItemCount() {        return list == null ? 0 : list.size();    }    //自定义一个Holder类继承RecyclerView.ViewHolder，管理每个item显示的视图    class ItemHolder extends RecyclerView.ViewHolder {        TextView tv;        public ItemHolder(View itemView) {            super(itemView);            tv = (TextView) itemView.findViewById(R.id.item_name);        }    }    }

4、配置显示管理以及适配器

    RecyclerView mRecycler = (RecyclerView) findViewById(R.id.m_recycler);     //RecyclerView有3种显示方式（列表、九宫格、瀑布流）每一种都有一个显示管理器     //显示列表     mRecycler.setLayoutManager(new LinearLayoutManager(this));    mRecycler.setAdapter(new MyAdapter(this,list));

设置九宫格显示

mRecycler.setLayoutManager(new GridLayoutManager(this,3));  //第二个参数表示列数

item之间的间距

 //添加分割线(item之间的间距) mRecycler.addItemDecoration(new DividerItemDecoration(this,     DividerItemDecoration.VERTICAL));

添加自定义分割线

/**    * 定义item之间的间距    */    public class MyItemDecoration extends RecyclerView.ItemDecoration {    @Override    public void getItemOffsets(Rect outRect, View view,         RecyclerView parent, RecyclerView.State state) {        //获取item的位置        int childPos = parent.getChildLayoutPosition(view);        if (childPos > 0 && childPos %2==0) {            outRect.top = 20;        }       }    }

添加边距mRecycler.addItemDecoration(new MyItemDecoration());

关于Item的点击监听，需要在适配器中初始化item布局时设置，然后在适配器中自定义回调接口将监听传回Activity或者Fragment中即可

 //自定义一个Holder类继承RecyclerView.ViewHolder，管理每个item显示的视图    class ItemHolder extends RecyclerView.ViewHolder implements View.OnClickListener {        TextView tv;        public ItemHolder(View itemView) {            super(itemView);            //对Item设置点击监听            itemView.setOnClickListener(this);            tv = (TextView) itemView.findViewById(R.id.item_name);        }        @Override        public void onClick(View v) {            //获得当前显示的item的位置            int position = getLayoutPosition();            onItemClickListener.onClick(position);        }    }

//将item的点击转出去的接口

  public interface OnItemClickListener{        void onClick(int position);    }    private OnItemClickListener onItemClickListener;    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {        this.onItemClickListener = onItemClickListener;    }

瀑布流

 mRecycler.setLayoutManager(new StaggeredGridLayoutManager    (2,StaggeredGridLayoutManager.VERTICAL));

第一个参数表示列数(或者行数),第二个参数表示显示的方向，VERTICAL表示垂直

适配器刷新

移除刷新    adapter.notifyItemRemoved(position);    添加刷新    adapter.notifyItemInserted(position);    移动刷新    adapter.notifyItemMoved(from,to);    当前屏幕上所有内容的刷新    adapter.notifyDataSetChanged();