Android RecyclerView通用Adapter及item拖拽、滑动删除

package cn.k12cloud.k12cloud2cv3.adapter.base;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import cn.k12cloud.k12cloud2cv3.adapter.holder.BaseViewHolder;
import cn.k12cloud.k12cloud2cv3.adapter.inter.OnItemClickListener;


/**
 * Created by jiang on 12/3/15.
 */
public abstract class BaseAdapter extends RecyclerView.Adapter<BaseViewHolder> {


    private OnItemClickListener onItemClickListener;

    @Override
    public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        BaseViewHolder holder = new BaseViewHolder(LayoutInflater.from(parent.getContext()).inflate(viewType, parent, false));
        return holder;
    }

    @Override
    public void onBindViewHolder(BaseViewHolder holder, final int position) {
        if (onItemClickListener != null) {
            holder.getmConvertView().setClickable(true);
            holder.getmConvertView().setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onItemClickListener.onItemClick(position);
                }
            });
        }
        onBindView(holder, position);

    }

    protected abstract void onBindView(BaseViewHolder holder, int position);

    @Override
    public int getItemViewType(int position) {
        return getLayoutID(position);
    }


    protected abstract int getLayoutID(int position);


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


}

package cn.k12cloud.k12cloud2cv3.adapter;

import java.util.List;

import cn.k12cloud.k12cloud2cv3.adapter.base.BaseAdapter;
import cn.k12cloud.k12cloud2cv3.adapter.holder.BaseViewHolder;

/**
 * Created by jiang on 12/3/15.
 */
public abstract class NormalAdapter<M> extends BaseAdapter {

    protected List<M> mLists;
    protected int layoutID;

    private boolean isNeedFoot;

    public static final int TYPE_ITEM = 2;
    public static final int TYPE_FOOT = 3;

    public NormalAdapter(List<M> mLists, int layoutID) {
        this.mLists = mLists;
        this.layoutID = layoutID;
    }


    private boolean isFootPosition(int position) {

        if (isNeedFoot) {
            if (position == getItemCount() - 1) {
                return true;
            }
        }
        return false;
    }

    protected abstract void onBindView(BaseViewHolder holder, int position);

    @Override
    protected int getLayoutID(int position) {
        return layoutID;
    }


    public void notifyWithNextPage(int nextPage) {
        setLastPage(nextPage);
        this.notifyDataSetChanged();
    }

    public void setLastPage(Integer nextPage) {
        if (nextPage == -1) {
            this.isNeedFoot = true;
        } else {
            this.isNeedFoot = false;
        }
    }


    @Override
    public int getItemCount() {
        int count = mLists.size();
        if (isNeedFoot) {
            return count + 1;
        }
        return count;
    }
}

package cn.k12cloud.k12cloud2cv3.adapter.holder;

import android.support.annotation.IdRes;
import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;

/**
 * Created by jiang on 12/3/15.
 */
public class BaseViewHolder extends RecyclerView.ViewHolder {

    protected final SparseArray<View> mViews;
    protected View mConvertView;


    public BaseViewHolder(View itemView) {
        super(itemView);
        mViews = new SparseArray<>();
        mConvertView = itemView;
    }


    /**
     * 通过控件的Id获取对应的控件，如果没有则加入mViews，则从item根控件中查找并保存到mViews中
     *
     * @param viewId
     * @return
     */
    public <T extends View> T getView(@IdRes int viewId) {
        View view = mViews.get(viewId);
        if (view == null) {
            view = mConvertView.findViewById(viewId);
            mViews.put(viewId, view);
        }
        return (T) view;
    }

    public View getmConvertView() {
        return mConvertView;
    }


}

package Utils.OnListener;

/**
 * Created by jiang on 12/3/15.
 */
public interface OnItemClickListener {

    void onItemClick(int position);
}

package Utils.OnListener;

import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by GZY on 16/5/18.
 */
public abstract class OnRecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
    private GestureDetectorCompat gestureDetectorCompat;
    private RecyclerView recyclerView;

    public OnRecyclerItemClickListener(RecyclerView recyclerView) {
        this.recyclerView = recyclerView;
        gestureDetectorCompat = new GestureDetectorCompat(recyclerView.getContext(), new ItemTouchHelperGestureListener());
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        gestureDetectorCompat.onTouchEvent(e);
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        gestureDetectorCompat.onTouchEvent(e);
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }

    public abstract void onItemClick(RecyclerView.ViewHolder vh);

    public abstract void onLongClick(RecyclerView.ViewHolder vh);

    private class ItemTouchHelperGestureListener extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            View child = recyclerView.findChildViewUnder(e.getX(), e.getY());

            if (child != null) {
                RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child);
                onItemClick(vh);
            }
            return true;
        }

        @Override
        public void onLongPress(MotionEvent e) {
            super.onLongPress(e);
            View child = recyclerView.findChildViewUnder(e.getX(), e.getY());

            if (child != null) {
                RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child);
                onLongClick(vh);
            }
        }
    }
}

package test.gzy.qqtest.RecyclerView;

import android.app.Service;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Vibrator;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Collections;

import test.gzy.qqtest.Utils.Adapter.BaseViewHolder;
import test.gzy.qqtest.Utils.Adapter.NormalAdapter;
import test.gzy.qqtest.Utils.OnListener.OnRecyclerItemClickListener;
import test.gzy.qqtest.R;

/**
 * Created by GZY on 16/5/18.
 */
public class RecyclerViewTestActivity extends AppCompatActivity {
    public RecyclerView recyclerView;
    public ArrayList<String> lists;
    public String[] datas = new String[]{"苹果", "橘子", "西瓜", "香蕉", "橘子", "西瓜", "香蕉", "橘子", "西瓜", "香蕉", "橘子", "西瓜", "香蕉", "橘子", "西瓜", "香蕉", "橘子", "西瓜", "香蕉", "橘子", "西瓜", "香蕉"};
    public NormalAdapter adapter;
    public ItemTouchHelper itemTouchHelper;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycler_test);
        initView();
        initData();
        setRecyclerView();
    }

    public void initView() {
        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    }


    public void initData() {
        lists = new ArrayList<>();
        for (int i = 0; i < datas.length; i++) {
            lists.add(datas[i]);
        }
    }

    public void setRecyclerView() {
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        linearLayoutManager.setAutoMeasureEnabled(true);
        recyclerView.setLayoutManager(linearLayoutManager);
        adapter = new NormalAdapter(lists, R.layout.item_recyclerviewtest) {
            @Override
            protected void onBindView(BaseViewHolder holder, int position) {
                TextView textView = holder.getView(R.id.item_recycler_tv);
                textView.setText(lists.get(position));
            }
        };
//        //第一种Item点击事件
//        adapter.setOnItemClickListener(new OnItemClickListener() {
//            @Override
//            public void onItemClick(int position) {
//                Snackbar.make(recyclerView, position + "", Snackbar.LENGTH_SHORT).show();
//            }
//        });
        recyclerView.setAdapter(adapter);

        //第二种Item点击事件
        recyclerView.addOnItemTouchListener(new OnRecyclerItemClickListener(recyclerView) {
            @Override
            public void onItemClick(RecyclerView.ViewHolder vh) {
                Snackbar.make(recyclerView, vh.getLayoutPosition() + "", Snackbar.LENGTH_SHORT).show();
            }

            @Override
            public void onLongClick(RecyclerView.ViewHolder vh) {
                //如果item不是最后一个，则执行拖拽
                if (vh.getLayoutPosition() != lists.size() - 1) {
                    itemTouchHelper.startDrag(vh);
                }
            }
        });
        /**
         * 拖拽
         */
        //  ItemTouchHelper会在拖拽的时候回调Callback中相应的方法，我们只需在Callback中实现自己的逻辑就可以了。
        itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
            //ItemTouchHelper会在拖拽的时候回调Callback中相应的方法，我们只需在Callback中实现自己的逻辑就可以了。
            @Override
            public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
                final int dragFlags;
                final int swipeFlags;
                if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
                    dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
                    swipeFlags = 0;
                } else {
                    dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
                    //注意⚠当设置了滑动删除时要换成下面那句
//                    swipeFlags = 0;
                    swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
                }
                //获取系统震动服务
                Vibrator vib = (Vibrator) getSystemService(Service.VIBRATOR_SERVICE);
                // 震动70毫秒
                vib.vibrate(70);
                return makeMovementFlags(dragFlags, swipeFlags);
            }
            //dragFlags 是拖拽标志，swipeFlags是滑动标志，我们把swipeFlags 都设置为0，暂时不考虑滑动相关操作。

            /**
             * 滑动
             * @param recyclerView
             * @param viewHolder
             * @param target
             * @return
             */
            //如果我们设置了相关的dragFlags,那么当我们长按item的时候就会进入拖拽并在拖拽过程中不断回调onMove()方法，
            // 我们就在这个方法里获取当前拖拽的item和已经被拖拽到所处位置的item的ViewHolder，有了这2个ViewHolder，
            // 我们就可以交换他们的数据集并调用Adapter的notifyItemMoved方法来刷新item。
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                //得到拖动的 ViewHolder的Position
                int fromPosition = viewHolder.getAdapterPosition();
                //得到目标ViewHolder的position
                int toPosition = target.getAdapterPosition();
                if (fromPosition < toPosition) {
                    for (int i = fromPosition; i < toPosition; i++) {
                        Collections.swap(lists, i, i + 1);//改变实际的数据集
                    }
                } else {
                    for (int i = fromPosition; i > toPosition; i--) {
                        Collections.swap(lists, i, i - 1);//改变实际的数据集
                    }
                }
                adapter.notifyItemMoved(fromPosition, toPosition);
                return true;
            }

            /**
             * 侧滑删除
             * @param viewHolder
             * @param direction
             */
            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
                int position = viewHolder.getAdapterPosition();
                adapter.notifyItemRemoved(position);
                lists.remove(position);
            }

            /**
             * 高亮
             * @param viewHolder
             * @param actionState
             */
            //到这里，已经可以拖拽了，基本的效果如下：
            //但是拖拽的时候我们拖拽的对象不能高亮显示，这是不友好的，我们希望拖拽的Item在拖拽的过程中背景颜色加深，这样就需要继续重写下面两个方法：
            @Override
            public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
                if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
                    viewHolder.itemView.setBackgroundColor(Color.LTGRAY);
                }
                super.onSelectedChanged(viewHolder, actionState);
            }

            @Override
            public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
                super.clearView(recyclerView, viewHolder);
                viewHolder.itemView.setBackgroundColor(0);
            }
            //OK，这样就完成了Item的拖拽排序，简单看下现在的效果：

            /**
             *  设置每个item不可以被点击
             */
            @Override
            public boolean isLongPressDragEnabled() {
                return false;
            }
        });

        itemTouchHelper.attachToRecyclerView(recyclerView);
    }
}

activity_recycler_test:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

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

item_recyclerviewtest:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/item_recycler_tv"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:gravity="center"
        android:text="123456" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_alignParentBottom="true"
        android:background="@android:color/darker_gray" />
</LinearLayout>