Android(安卓)recyclerview实现查看更多/收起功能

效果图如下（没搞GIF转换工具，只能截图了。。。）：

布局文件activity_main.xml，就一个recyclerview:

<?xml version="1.0" encoding="utf-8"?>

代码MainActivity:

package seemore.test.com.seemorerecycleview;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private RecyclerView recyclerView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        recyclerView = (RecyclerView) findViewById(R.id.rv_main);        List list = new ArrayList<>();        for (int i = 0; i < 30; i++) {            list.add("哈萨ki" + i);        }        SeeMoreAdapter seeMoreAdapter = new SeeMoreAdapter(list);        recyclerView.setLayoutManager(new GridLayoutManager(this, 4));        recyclerView.setAdapter(seeMoreAdapter);        seeMoreAdapter.setOnITEMClickListener(new SeeMoreAdapter.OnItemClick() {            @Override            public void onItemClick(int position) {                int mPosition = position + 1;                Toast.makeText(getBaseContext(),"点击了第"+ mPosition +"个哈萨ki",Toast.LENGTH_SHORT).show();            }        });    }}

布局文件item_view:

<?xml version="1.0" encoding="utf-8"?>

代码SeeMoreAdapter：

package seemore.test.com.seemorerecycleview;import android.support.annotation.NonNull;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;import java.util.List;class SeeMoreAdapter extends RecyclerView.Adapter {    private final static int TYPE_NORMAL = 0;//正常条目    private final static int TYPE_SEE_MORE = 1;//查看更多    private final static int TYPE_HIDE = 2;//收起    private List mList;    private boolean mOpen = false;//是否是展开状态    SeeMoreAdapter(List mList) {        this.mList = mList;    }    @NonNull    @Override    public SeeMoreViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_view, viewGroup, false);        return new SeeMoreViewHolder(view);    }    @Override    public void onBindViewHolder(@NonNull SeeMoreViewHolder seeMoreViewHolder, final int position) {//        TextView textView = (TextView) seeMoreViewHolder.textView;        if (getItemViewType(position) == TYPE_HIDE) {            seeMoreViewHolder.textView.setText("收起");            seeMoreViewHolder.rl_item.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    mOpen = false;                    notifyDataSetChanged();                }            });        } else if (getItemViewType(position) == TYPE_SEE_MORE) {            seeMoreViewHolder.textView.setText("查看更多");            seeMoreViewHolder.rl_item.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    mOpen = true;                    notifyDataSetChanged();                }            });        } else {            seeMoreViewHolder.textView.setText(mList.get(position));            seeMoreViewHolder.rl_item.setClickable(false);            if (onItemClick!=null){                seeMoreViewHolder.rl_item.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        onItemClick.onItemClick(position);                    }                });            }        }    }    @Override    public int getItemViewType(int position) {        if (mList.size() <= 4) {            return TYPE_NORMAL;        }        if (mOpen) {            if (position == mList.size()) {                return TYPE_HIDE;            } else {                return TYPE_NORMAL;            }        } else {            if (position == 3) {                return TYPE_SEE_MORE;            } else {                return TYPE_NORMAL;            }        }    }    @Override    public int getItemCount() {        if (mList == null || mList.size() == 0) {            return 0;        }        if (mList.size() > 4) {            //若现在是展开状态 条目数量需要+1 "收起"条目            if (mOpen) {                return mList.size() + 1;            } else {                return 4;            }        } else {            return mList.size();        }    }    class SeeMoreViewHolder extends RecyclerView.ViewHolder {        TextView textView ;        ImageView iv_item ;        RelativeLayout rl_item ;        public SeeMoreViewHolder(@NonNull View itemView) {            super(itemView);            textView = itemView.findViewById(R.id.itemView);            iv_item = itemView.findViewById(R.id.iv_item);            rl_item = itemView.findViewById(R.id.rl_item);        }    }    public interface OnItemClick{        void onItemClick(int position);    }    private OnItemClick onItemClick;    public void setOnITEMClickListener(OnItemClick onItemClick){        this.onItemClick = onItemClick;    }}

代码链接：https://download.csdn.net/download/qq_38306233/12311257

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