RecyclerViewのアップドロップダウン・リフレッシュ

ListViewの時代には、トップダウンリフレッシュはListViewにヘッダレイアウトとテールレイアウトを追加して実現することができ、スライド動作を動的にモニタリングすることで、ページリフレッシュを実現する効果は主流の第三者のXListViewとPullToListViewのように、このような方法で実現されたトップダウンのリフレッシュ効果であり、最近、内包ネタとこの2つのappのように新しいリフレッシュ効果が使われていることに気づきました.Googleが新しく発表したコントロールSwipeRefreshLayoutを使用して実現したドロップダウン・リフレッシュの効果を調べたところ、このコントロールの内部にはサブViewの追加しか許可されていないため、リストViewまたは(RecyclerView)またはLayoutを追加してドロップダウン・リフレッシュの効果をアップロードすることができ、アダプタで動的に判断することができます.

  int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();

package com.longyue.recyclerviewreflesh3;

import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import butterknife.ButterKnife;
import butterknife.InjectView;

/** * @author Leo */
public class MainActivity extends AppCompatActivity {


    @InjectView(R.id.toolbar)
    Toolbar toolbar;
    @InjectView(R.id.recyclerView)
    RecyclerView recyclerView;
    @InjectView(R.id.SwipeRefreshLayout)
    SwipeRefreshLayout swipeRefreshLayout;

    boolean isLoading;
    private List<Map<String, Object>> data = new ArrayList<>();
    private RecyclerViewAdapter adapter = new RecyclerViewAdapter(this, data);
    private Handler handler = new Handler();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_notice);
        ButterKnife.inject(this);
        initView();
        initData();
    }

    public void initView() {
        setSupportActionBar(toolbar);
        toolbar.setTitle(R.string.notice);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        swipeRefreshLayout.setColorSchemeResources(R.color.blueStatus);
        swipeRefreshLayout.post(new Runnable() {
            @Override
            public void run() {
                swipeRefreshLayout.setRefreshing(true);
            }
        });

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        data.clear();
                        getData();
                    }
                }, 2000);
            }
        });
        final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(adapter);
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                Log.d("test", "StateChanged = " + newState);


            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                Log.d("test", "onScrolled");

                int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
                if (lastVisibleItemPosition + 1 == adapter.getItemCount()) {
                    Log.d("test", "loading executed");

                    boolean isRefreshing = swipeRefreshLayout.isRefreshing();
                    if (isRefreshing) {
                        adapter.notifyItemRemoved(adapter.getItemCount());
                        return;
                    }
                    if (!isLoading) {
                        isLoading = true;
                        handler.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                getData();
                                Log.d("test", "load more completed");
                                isLoading = false;
                            }
                        }, 1000);
                    }
                }
            }
        });

        // 
        adapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Log.d("test", "item position = " + position);
            }

            @Override
            public void onItemLongClick(View view, int position) {

            }
        });
    }


    public void initData() {
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                getData();
            }
        }, 1500);

    }

    /** *   */
    private void getData() {
        for (int i = 0; i < 6; i++) {
            Map<String, Object> map = new HashMap<>();
            data.add(map);
        }
        adapter.notifyDataSetChanged();
        swipeRefreshLayout.setRefreshing(false);
        adapter.notifyItemRemoved(adapter.getItemCount());
    }


}

package com.longyue.recyclerviewreflesh3;

import android.content.Context;
import android.support.v7.widget.RecyclerView.Adapter;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

public class RecyclerViewAdapter extends Adapter<ViewHolder> {

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_FOOTER = 1;
    private Context context;
    private List data;


    public RecyclerViewAdapter(Context context, List data) {
        this.context = context;
        this.data = data;
    }

    public interface OnItemClickListener {
        void onItemClick(View view, int position);

        void onItemLongClick(View view, int position);
    }

    private OnItemClickListener onItemClickListener;

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

    @Override
    public int getItemCount() {
        return data.size() == 0 ? 0 : data.size() + 1;
    }

    @Override
    public int getItemViewType(int position) {
        if (position + 1 == getItemCount()) {
            return TYPE_FOOTER;
        } else {
            return TYPE_ITEM;
        }
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == TYPE_ITEM) {
            View view = LayoutInflater.from(context).inflate(R.layout.item_base, parent,
                    false);
            return new ItemViewHolder(view);
        } else if (viewType == TYPE_FOOTER) {
            View view = LayoutInflater.from(context).inflate(R.layout.item_foot, parent,
                    false);
            return new FootViewHolder(view);
        }
        return null;
    }


    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        if (holder instanceof ItemViewHolder) {
            //holder.tv.setText(data.get(position));
            if (onItemClickListener != null) {
                holder.itemView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        int position = holder.getLayoutPosition();
                        onItemClickListener.onItemClick(holder.itemView, position);
                    }
                });

                holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                        int position = holder.getLayoutPosition();
                        onItemClickListener.onItemLongClick(holder.itemView, position);
                        return false;
                    }
                });
            }
        }
    }


    static class ItemViewHolder extends ViewHolder {

        TextView tv;

        public ItemViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.tv_date);
        }
    }

    static class FootViewHolder extends ViewHolder {

        public FootViewHolder(View view) {
            super(view);
        }
    }
}

Demoダウンロード