[安卓framework Recyclerview ]神奇的疊加滑動效果，幫助深入理解recyclerveiw裏面的東西

//一：先定義一個recyclerview的adapter，holder，以及接口

public interface OnItemClickListener<T> {
    void onItemClick(ViewGroup var1, View var2, T var3, int var4);

    boolean onItemLongClick(ViewGroup var1, View var2, T var3, int var4);
}

public abstract class UniversalAdapter<T> extends Adapter<ViewHolder> {
    protected Context mContext;
    protected int mLayoutId;
    protected List<T> mDatas;
    protected LayoutInflater mInflater;
    protected ViewGroup mRv;
    private OnItemClickListener mOnItemClickListener;

    public UniversalAdapter setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.mOnItemClickListener = onItemClickListener;
        return this;
    }

    public OnItemClickListener getmOnItemClickListener() {
        return this.mOnItemClickListener;
    }

    public UniversalAdapter(Context context, List<T> datas, int layoutId) {
        this.mContext = context;
        this.mInflater = LayoutInflater.from(context);
        this.mLayoutId = layoutId;
        this.mDatas = datas;
    }

    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        ViewHolder viewHolder = ViewHolder.get(this.mContext, (View)null, parent, this.mLayoutId);
        if(null == this.mRv) {
            this.mRv = parent;
        }

        return viewHolder;
    }

    protected int getPosition(android.support.v7.widget.RecyclerView.ViewHolder viewHolder) {
        return viewHolder.getAdapterPosition();
    }

    protected boolean isEnabled(int viewType) {
        return true;
    }

    /** @deprecated */
    @Deprecated
    protected void setListener(final ViewGroup parent, final ViewHolder viewHolder, int viewType) {
        if(this.isEnabled(viewType)) {
            viewHolder.itemView.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    if(UniversalAdapter.this.mOnItemClickListener != null) {
                        int position = UniversalAdapter.this.getPosition(viewHolder);
                        UniversalAdapter.this.mOnItemClickListener.onItemClick(parent, v, UniversalAdapter.this.mDatas.get(position), position);
                    }

                }
            });
            viewHolder.itemView.setOnLongClickListener(new OnLongClickListener() {
                public boolean onLongClick(View v) {
                    if(UniversalAdapter.this.mOnItemClickListener != null) {
                        int position = UniversalAdapter.this.getPosition(viewHolder);
                        return UniversalAdapter.this.mOnItemClickListener.onItemLongClick(parent, v, UniversalAdapter.this.mDatas.get(position), position);
                    } else {
                        return false;
                    }
                }
            });
        }
    }

    public void onBindViewHolder(ViewHolder holder, int position) {
        this.setListener(position, holder);
        this.convert(holder, this.mDatas.get(position));
    }

    protected void setListener(final int position, final ViewHolder viewHolder) {
        if(this.isEnabled(this.getItemViewType(position))) {
            viewHolder.itemView.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    if(UniversalAdapter.this.mOnItemClickListener != null) {
                        UniversalAdapter.this.mOnItemClickListener.onItemClick(UniversalAdapter.this.mRv, v, UniversalAdapter.this.mDatas.get(position), position);
                    }

                }
            });
            viewHolder.itemView.setOnLongClickListener(new OnLongClickListener() {
                public boolean onLongClick(View v) {
                    if(UniversalAdapter.this.mOnItemClickListener != null) {
                        int position = UniversalAdapter.this.getPosition(viewHolder);
                        return UniversalAdapter.this.mOnItemClickListener.onItemLongClick(UniversalAdapter.this.mRv, v, UniversalAdapter.this.mDatas.get(position), position);
                    } else {
                        return false;
                    }
                }
            });
        }
    }

    // 將 var2的數據 顯示在ViewHolder 的對應 View 中
    public abstract void convert(ViewHolder var1, T var2);

    public int getItemCount() {
        return this.mDatas != null?this.mDatas.size():0;
    }

    public void setDatas(List<T> list) {
        if(this.mDatas != null) {
            if(null != list) {
                ArrayList temp = new ArrayList();
                temp.addAll(list);
                this.mDatas.clear();
                this.mDatas.addAll(temp);
            } else {
                this.mDatas.clear();
            }
        } else {
            this.mDatas = list;
        }

        this.notifyDataSetChanged();
    }

    public void remove(int i) {
        if(null != this.mDatas && this.mDatas.size() > i && i > -1) {
            this.mDatas.remove(i);
            this.notifyDataSetChanged();
        }

    }

    public void addDatas(List<T> list) {
        if(null != list) {
            ArrayList temp = new ArrayList();
            temp.addAll(list);
            if(this.mDatas != null) {
                this.mDatas.addAll(temp);
            } else {
                this.mDatas = temp;
            }

            this.notifyDataSetChanged();
        }

    }

    public List<T> getDatas() {
        return this.mDatas;
    }

    public T getItem(int position) {
        return position > -1 && null != this.mDatas && this.mDatas.size() > position?this.mDatas.get(position):null;
    }
}

public class ViewHolder extends RecyclerView.ViewHolder {
    private SparseArray<View> mViews = new SparseArray();
    private int mLayoutId;

    public ViewHolder(View itemView) {
        super(itemView);
    }

    public static ViewHolder get(Context context, View convertView, ViewGroup parent, int layoutId) {
        if (convertView == null) {
            View holder2 = LayoutInflater.from(context).inflate(layoutId, parent, false);
            ViewHolder holder1 = new ViewHolder(holder2);
            holder1.mLayoutId = layoutId;
            return holder1;
        } else {
            ViewHolder holder = (ViewHolder) convertView.getTag();
            return holder;
        }
    }

    public int getLayoutId() {
        return this.mLayoutId;
    }

    public <T extends View> T getView(int viewId) {
        View view = (View) this.mViews.get(viewId);
        if (view == null) {
            view = this.itemView.findViewById(viewId);
            this.mViews.put(viewId, view);
        }

        return (T) view;
    }

    public ViewHolder setText(int viewId, CharSequence text) {
        TextView tv = (TextView) this.getView(viewId);
        tv.setText(text);
        return this;
    }

    public ViewHolder setSelected(int viewId, boolean selected) {
        View v = this.getView(viewId);
        v.setSelected(selected);
        return this;
    }

    public ViewHolder setImageResource(int viewId, int resId) {
        ImageView view = (ImageView) this.getView(viewId);
        view.setImageResource(resId);
        return this;
    }

    public ViewHolder setImageBitmap(int viewId, Bitmap bitmap) {
        ImageView view = (ImageView) this.getView(viewId);
        view.setImageBitmap(bitmap);
        return this;
    }

    public ViewHolder setImageDrawable(int viewId, Drawable drawable) {
        ImageView view = (ImageView) this.getView(viewId);
        view.setImageDrawable(drawable);
        return this;
    }

    public ViewHolder setBackgroundColor(int viewId, int color) {
        View view = this.getView(viewId);
        view.setBackgroundColor(color);
        return this;
    }

    public ViewHolder setBackgroundRes(int viewId, int backgroundRes) {
        View view = this.getView(viewId);
        view.setBackgroundResource(backgroundRes);
        return this;
    }

    public ViewHolder setTextColor(int viewId, int textColor) {
        TextView view = (TextView) this.getView(viewId);
        view.setTextColor(textColor);
        return this;
    }

    public ViewHolder setTextColorRes(int viewId, int textColorRes) {
        TextView view = (TextView) this.getView(viewId);
        view.setTextColor(this.itemView.getContext().getResources().getColor(textColorRes));
        return this;
    }

    @SuppressLint({"NewApi"})
    public ViewHolder setAlpha(int viewId, float value) {
        if (VERSION.SDK_INT >= 11) {
            this.getView(viewId).setAlpha(value);
        } else {
            AlphaAnimation alpha = new AlphaAnimation(value, value);
            alpha.setDuration(0L);
            alpha.setFillAfter(true);
            this.getView(viewId).startAnimation(alpha);
        }

        return this;
    }

    public ViewHolder setVisible(int viewId, boolean visible) {
        View view = this.getView(viewId);
        view.setVisibility(visible ? View.VISIBLE : View.GONE);
        return this;
    }

    public ViewHolder linkify(int viewId) {
        TextView view = (TextView) this.getView(viewId);
        Linkify.addLinks(view, Linkify.ALL);
        return this;
    }

    public ViewHolder setTypeface(Typeface typeface, int... viewIds) {
        int[] var3 = viewIds;
        int var4 = viewIds.length;

        for (int var5 = 0; var5 < var4; ++var5) {
            int viewId = var3[var5];
            TextView view = (TextView) this.getView(viewId);
            view.setTypeface(typeface);
            view.setPaintFlags(view.getPaintFlags() | 128);
        }

        return this;
    }

    public ViewHolder setProgress(int viewId, int progress) {
        ProgressBar view = (ProgressBar) this.getView(viewId);
        view.setProgress(progress);
        return this;
    }

    public ViewHolder setProgress(int viewId, int progress, int max) {
        ProgressBar view = (ProgressBar) this.getView(viewId);
        view.setMax(max);
        view.setProgress(progress);
        return this;
    }

    public ViewHolder setMax(int viewId, int max) {
        ProgressBar view = (ProgressBar) this.getView(viewId);
        view.setMax(max);
        return this;
    }

    public ViewHolder setRating(int viewId, float rating) {
        RatingBar view = (RatingBar) this.getView(viewId);
        view.setRating(rating);
        return this;
    }

    public ViewHolder setRating(int viewId, float rating, int max) {
        RatingBar view = (RatingBar) this.getView(viewId);
        view.setMax(max);
        view.setRating(rating);
        return this;
    }

    public ViewHolder setTag(int viewId, Object tag) {
        View view = this.getView(viewId);
        view.setTag(tag);
        return this;
    }

    public ViewHolder setTag(int viewId, int key, Object tag) {
        View view = this.getView(viewId);
        view.setTag(key, tag);
        return this;
    }

    public ViewHolder setChecked(int viewId, boolean checked) {
        Checkable view = (Checkable) this.getView(viewId);
        view.setChecked(checked);
        return this;
    }

    public ViewHolder setOnClickListener(int viewId, OnClickListener listener) {
        View view = this.getView(viewId);
        view.setOnClickListener(listener);
        return this;
    }

    public ViewHolder setOnTouchListener(int viewId, OnTouchListener listener) {
        View view = this.getView(viewId);
        view.setOnTouchListener(listener);
        return this;
    }

    public ViewHolder setOnLongClickListener(int viewId, OnLongClickListener listener) {
        View view = this.getView(viewId);
        view.setOnLongClickListener(listener);
        return this;
    }

    public void setItemVisible(boolean visible) {
        if (null != this.itemView) {
            if (visible) {
                if (null != this.itemView.getLayoutParams()) {
                    this.itemView.getLayoutParams().width = -1;
                    this.itemView.getLayoutParams().height = -2;
                } else {
                    this.itemView.setLayoutParams(new LayoutParams(-1, -2));
                }

                this.itemView.setVisibility(View.VISIBLE);
            } else {
                if (null != this.itemView.getLayoutParams()) {
                    this.itemView.getLayoutParams().width = -1;
                    this.itemView.getLayoutParams().height = 1;
                } else {
                    this.itemView.setLayoutParams(new LayoutParams(-1, 1));
                }

                this.itemView.setVisibility(View.GONE);
            }
        }

    }

    public void setHItemVisible(boolean visible) {
        if (null != this.itemView) {
            if (visible) {
                if (null != this.itemView.getLayoutParams()) {
                    this.itemView.getLayoutParams().width = -2;
                    this.itemView.getLayoutParams().height = -2;
                } else {
                    this.itemView.setLayoutParams(new LayoutParams(-1, -2));
                }

                this.itemView.setVisibility(View.VISIBLE);
            } else {
                if (null != this.itemView.getLayoutParams()) {
                    this.itemView.getLayoutParams().width = -1;
                    this.itemView.getLayoutParams().height = 1;
                } else {
                    this.itemView.setLayoutParams(new LayoutParams(-1, 1));
                }

                this.itemView.setVisibility(View.GONE);
            }
        }

    }
}

//二：常量類

public class CardConfig {
    //屏幕上最多同時顯示幾個Item
    public static int MAX_SHOW_COUNT;

    //每一級Scale相差0.05f，translationY相差7dp左右
    public static float SCALE_GAP;
    public static int TRANS_Y_GAP;

    public static void initConfig(Context context) {
        MAX_SHOW_COUNT = 4;
        SCALE_GAP = 0.05f;
        TRANS_Y_GAP = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 15, context.getResources().getDisplayMetrics());
    }
}

//三：數據bean

package com.enjoy.leo_swipecardview;

import java.util.ArrayList;
import java.util.List;

public class SwipeCardBean {
    private int postition;
    private String url;
    private String name;

    public SwipeCardBean(int postition, String url, String name) {
        this.postition = postition;
        this.url = url;
        this.name = name;
    }

    public int getPostition() {
        return postition;
    }

    public SwipeCardBean setPostition(int postition) {
        this.postition = postition;
        return this;
    }

    public String getUrl() {
        return url;
    }

    public SwipeCardBean setUrl(String url) {
        this.url = url;
        return this;
    }

    public String getName() {
        return name;
    }

    public SwipeCardBean setName(String name) {
        this.name = name;
        return this;
    }

    public static List<SwipeCardBean> initDatas() {
        List<SwipeCardBean> datas = new ArrayList<>();
        int i = 1;
        datas.add(new SwipeCardBean(i++, "http://img5q.duitang.com/uploads/item/201505/04/20150504155117_8i4Rk.thumb.700_0.jpeg", "美女1"));
        datas.add(new SwipeCardBean(i++, "http://cdnq.duitang.com/uploads/item/201505/04/20150504155014_irFvu.thumb.700_0.jpeg", "美女2"));
        datas.add(new SwipeCardBean(i++, "http://img5q.duitang.com/uploads/item/201309/17/20130917032356_hdGjF.thumb.700_0.jpeg", "美女3"));
        datas.add(new SwipeCardBean(i++, "http://img5q.duitang.com/uploads/item/201505/04/20150504155137_JWcRK.thumb.700_0.jpeg", "美女4"));
        datas.add(new SwipeCardBean(i++, "http://img5q.duitang.com/uploads/item/201505/04/20150504155036_zNrPT.thumb.700_0.jpeg", "美女5"));
        datas.add(new SwipeCardBean(i++, "http://img5q.duitang.com/uploads/item/201504/26/201504262026_weMcT.thumb.700_0.jpeg", "美女6"));
        datas.add(new SwipeCardBean(i++, "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1560164210849&di=c6ea3fdd3ec938600ddde9022f46033c&imgtype=0&src=http%3A%2F%2Fbbs-fd.zol-img.com.cn%2Ft_s800x5000%2Fg4%2FM09%2F00%2F07%2FCg-4WlJA9zCIPZ8PAAQWAhRW0ssAAMA8wD2hYAABBYa996.jpg", "美女7"));
        datas.add(new SwipeCardBean(i++, "http://imgq.duitang.com/uploads/item/201504/21/20150421H2323_uwdEs.jpeg","美女8"));
        return datas;
    }
}

//四：實現ItemTouchHelper

public class SwipeCardCallback extends ItemTouchHelper.SimpleCallback {

    private RecyclerView mRv;
    private UniversalAdapter<SwipeCardBean> adapter;
    private List<SwipeCardBean> mDatas;

    public SwipeCardCallback(RecyclerView mRv,
                             UniversalAdapter<SwipeCardBean> adapter, List<SwipeCardBean> mDatas) {
        //方向
        super(0, 15);//1111
        this.mRv = mRv;
        this.adapter = adapter;
        this.mDatas = mDatas;
    }

    //drag
    @Override
    public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder viewHolder1) {
        return false;
    }

    // item 滑出去後回調
    @Override
    public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
        SwipeCardBean remove = mDatas.remove(viewHolder.getLayoutPosition());//第八個
        mDatas.add(0, remove);//放到第一個
        adapter.notifyDataSetChanged();
    }

    // onDraw
    @Override
    public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView,
                            @NonNull RecyclerView.ViewHolder viewHolder, float dX,
                            float dY, int actionState, boolean isCurrentlyActive) {
        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

        double maxDistance = recyclerView.getWidth() * 0.5f;
        double distance = Math.sqrt(dX * dX + dY * dY);
        double fraction = distance / maxDistance;

        if (fraction > 1) {
            fraction = 1;
        }

        // 顯示的個數  4個
        int itemCount = recyclerView.getChildCount();

        for (int i = 0; i < itemCount; i++) {
            View view = recyclerView.getChildAt(i);

            int level = itemCount - i - 1;

            if (level > 0) {
                if (level < CardConfig.MAX_SHOW_COUNT - 1) {
                    view.setTranslationY((float) (CardConfig.TRANS_Y_GAP * level - fraction * CardConfig.TRANS_Y_GAP));
                    view.setScaleX((float) (1 - CardConfig.SCALE_GAP * level + fraction * CardConfig.SCALE_GAP));
                    view.setScaleY((float) (1 - CardConfig.SCALE_GAP * level + fraction * CardConfig.SCALE_GAP));
                }
            }
        }
    }

    @Override
    public long getAnimationDuration(@NonNull RecyclerView recyclerView, int animationType, float animateDx, float animateDy) {
        return 1000;
    }

    @Override
    public float getSwipeThreshold(@NonNull RecyclerView.ViewHolder viewHolder) {
        return 0.2f;
    }
}

五：自定義LayoutManager

public class SwipeCardLayoutManager extends RecyclerView.LayoutManager {


    @Override
    public RecyclerView.LayoutParams generateDefaultLayoutParams() {
        return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
    }

    @Override
    public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
//        super.onLayoutChildren(recycler, state);
        // 回收 複用
        detachAndScrapAttachedViews(recycler);
        // 8個
        int itemCount = getItemCount();
        int bottomPosition;

        // 0,1,2,3,4,5,6,7
        if (itemCount < CardConfig.MAX_SHOW_COUNT) {
            bottomPosition = 0;
        } else {
            bottomPosition = itemCount - CardConfig.MAX_SHOW_COUNT;
        }
        for (int i = bottomPosition; i < itemCount; i++) {
            //複用
            View view = recycler.getViewForPosition(i);
            addView(view);

            measureChildWithMargins(view, 0, 0);

            // 求padding的總大小
            int widthSpace = getWidth() - getDecoratedMeasuredWidth(view);
            int heightSpace = getHeight() - getDecoratedMeasuredHeight(view);

            // 佈局
            layoutDecoratedWithMargins(view,
                    widthSpace / 2,
                    heightSpace / 2,
                    widthSpace / 2 + getDecoratedMeasuredWidth(view),
                    heightSpace / 2 + getDecoratedMeasuredHeight(view));

            int level = itemCount - i - 1;

            if(level > 0) {
                if(level < CardConfig.MAX_SHOW_COUNT - 1) {
                    view.setTranslationY(CardConfig.TRANS_Y_GAP * level);
                    view.setScaleX(1 - CardConfig.SCALE_GAP * level);
                    view.setScaleY(1 - CardConfig.SCALE_GAP * level);
                } else {
                    view.setTranslationY(CardConfig.TRANS_Y_GAP * (level-1));
                    view.setScaleX(1 - CardConfig.SCALE_GAP * (level-1));
                    view.setScaleY(1 - CardConfig.SCALE_GAP * (level-1));
                }
            }
        }

    }
}

//六使用

public class MainActivity extends Activity {

    private RecyclerView rv;
    private UniversalAdapter<SwipeCardBean> adapter;
    private List<SwipeCardBean> mDatas;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_swipe_card);

        rv = findViewById(R.id.rv);
        rv.setLayoutManager(new SwipeCardLayoutManager());

        mDatas = SwipeCardBean.initDatas();
        adapter = new UniversalAdapter<SwipeCardBean>(MainActivity.this, mDatas, R.layout.item_swipe_card) {
            @Override
            public void convert(ViewHolder ViewHolder, SwipeCardBean swipeCardBean) {
                ViewHolder.setText(R.id.tvName, swipeCardBean.getName());
                ViewHolder.setText(R.id.tvPrecent, swipeCardBean.getPostition() + "/" + mDatas.size());
                Glide.with(MainActivity.this)
                        .load(swipeCardBean.getUrl())
                        .into((ImageView) ViewHolder.getView(R.id.iv));
            }
        };
        rv.setAdapter(adapter);
        CardConfig.initConfig(this);

        Callback callback = new SwipeCardCallback(rv, adapter, mDatas);
        ItemTouchHelper helper = new ItemTouchHelper(callback);
        helper.attachToRecyclerView(rv);

    }

}

[安卓framework Recyclerview ]神奇的疊加滑動效果，幫助深入理解recyclerveiw裏面的東西

[安卓framework Recyclerview ]神奇的疊加滑動效果，幫助深入理解recyclerveiw裏面的東西

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