仿探探的卡片滑动效果-recyclerView实现

这里是一个通过自定义view和自定义RecyclerView的:layoutManager，再结合ItemTouchHelper实现的一个仿探探的卡片滑动的效果:

效果图已经奉上，接下来是代码:

首先是每张图片的布局:item

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="336dp"
    android:layout_height="426dp"
    android:background="@drawable/img_card_background"
    android:gravity="center"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <com.bwie.w.test1121.cardswipelayout.RoundImageView
            android:id="@+id/iv_avatar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:src="@drawable/img_avatar_01"
            app:radius="7.5dp" />

        <ImageView
            android:id="@+id/iv_dislike"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_marginRight="15dp"
            android:layout_marginTop="15dp"
            android:alpha="0"
            android:src="@drawable/img_dislike" />

        <ImageView
            android:id="@+id/iv_like"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15dp"
            android:layout_marginTop="15dp"
            android:alpha="0"
            android:src="@drawable/img_like" />

    </RelativeLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:paddingLeft="14dp"
        android:paddingTop="15dp">

        <TextView
            android:id="@+id/tv_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="小姐姐"
            android:textColor="@android:color/black"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/tv_age"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/tv_name"
            android:layout_marginTop="5dp"
            android:background="@drawable/shape_age"
            android:gravity="center"
            android:text="♀ 23"
            android:textColor="#FFFFFF"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tv_constellation"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/tv_name"
            android:layout_marginLeft="4dp"
            android:layout_marginTop="5dp"
            android:layout_toRightOf="@id/tv_age"
            android:background="@drawable/shape_constellation"
            android:gravity="center"
            android:text="狮子座"
            android:textColor="#FFFFFF"
            android:textSize="14sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/tv_age"
            android:layout_marginTop="5dp"
            android:gravity="center"
            android:text="IT/互联网"
            android:textColor="#cbcbcb" />

    </RelativeLayout>


</LinearLayout>

activity_main:

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

一个常量参数类:CardConfig

/**
 * 常量参数
 */

public final class CardConfig {
    /**
     * 显示可见的卡片数量
     */
    public static final int DEFAULT_SHOW_ITEM = 3;
    /**
     * 默认缩放的比例
     */
    public static final float DEFAULT_SCALE = 0.1f;
    /**
     * 卡片Y轴偏移量时按照14等分计算
     */
    public static final int DEFAULT_TRANSLATE_Y = 14;
    /**
     * 卡片滑动时默认倾斜的角度
     */
    public static final float DEFAULT_ROTATE_DEGREE = 15f;
    /**
     * 卡片滑动时不偏左也不偏右
     */
    public static final int SWIPING_NONE = 1;
    /**
     * 卡片向左滑动时
     */
    public static final int SWIPING_LEFT = 1 << 2;
    /**
     * 卡片向右滑动时
     */
    public static final int SWIPING_RIGHT = 1 << 3;
    /**
     * 卡片从左边滑出
     */
    public static final int SWIPED_LEFT = 1;
    /**
     * 卡片从右边滑出
     */
    public static final int SWIPED_RIGHT = 1 << 2;

}

拖动item的回调类:CardItemTouchHelperCallBack

public class CardItemTouchHelperCallback<T> extends ItemTouchHelper.Callback {

    private final RecyclerView.Adapter adapter;
    private List<T> dataList;
    private OnSwipeListener<T> mListener;

    public CardItemTouchHelperCallback(@NonNull RecyclerView.Adapter adapter, @NonNull List<T> dataList) {
        this.adapter = checkIsNull(adapter);
        this.dataList = checkIsNull(dataList);
    }

    public CardItemTouchHelperCallback(@NonNull RecyclerView.Adapter adapter, @NonNull List<T> dataList, OnSwipeListener<T> listener) {
        this.adapter = checkIsNull(adapter);
        this.dataList = checkIsNull(dataList);
        this.mListener = listener;
    }

    private <T> T checkIsNull(T t) {
        if (t == null) {
            throw new NullPointerException();
        }
        return t;
    }

    public void setOnSwipedListener(OnSwipeListener<T> mListener) {
        this.mListener = mListener;
    }


    /**
     * 设置滑动类型标记
     *
     * @param recyclerView
     * @param viewHolder
     * @return
     *          返回一个整数类型的标识，用于判断Item那种移动行为是允许的
     */
    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        int dragFlags = 0;
        int swipeFlags = 0;
        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
        if (layoutManager instanceof CardLayoutManager) {
            swipeFlags = ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
        }
        return makeMovementFlags(dragFlags, swipeFlags);
    }
    /**
     * 拖拽切换Item的回调
     *
     * @param recyclerView
     * @param viewHolder
     * @param target
     * @return
     *          如果Item切换了位置，返回true；反之，返回false
     */

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        return false;
    }

    /**
     *
     * 划出时会执行
     * @param viewHolder
     * @param direction:左侧划出为:4,右侧划出为:8
     */
    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        Log.d("mylog", "onSwiped: " + direction);
        // 移除 onTouchListener,否则触摸滑动会乱了
        viewHolder.itemView.setOnTouchListener(null);
        int layoutPosition = viewHolder.getLayoutPosition();
        T remove = dataList.remove(layoutPosition);
        adapter.notifyDataSetChanged();
        if (mListener != null) {
            mListener.onSwiped(viewHolder, remove, direction == ItemTouchHelper.LEFT ? CardConfig.SWIPED_LEFT : CardConfig.SWIPED_RIGHT);
        }
        // 当没有数据时回调 mListener
        if (adapter.getItemCount() == 0) {
            if (mListener != null) {
                mListener.onSwipedClear();
            }
        }
    }
    /**
     * Item是否支持滑动
     *
     * @return
     *          true  支持滑动操作
     *          false 不支持滑动操作
     */

    @Override
    public boolean isItemViewSwipeEnabled() {
        return false;
    }

    /**
     * 拖动时会执行的方法
     * @param c
     * @param recyclerView
     * @param viewHolder
     * @param dX
     * @param dY
     * @param actionState
     * @param isCurrentlyActive
     */
    @Override
    public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
                            float dX, float dY, int actionState, boolean isCurrentlyActive) {
        super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
       // Log.d("mylog", "onChildDraw: 拖动");
        View itemView = viewHolder.itemView;
        if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
            float ratio = dX / getThreshold(recyclerView, viewHolder);
            // ratio 最大为 1 或 -1
            if (ratio > 1) {
                ratio = 1;
            } else if (ratio < -1) {
                ratio = -1;
            }
            Log.d("mylog", "onChildDraw: " + ratio);
            itemView.setRotation(ratio * CardConfig.DEFAULT_ROTATE_DEGREE);
            int childCount = recyclerView.getChildCount();
            // 当数据源个数大于最大显示数时
            if (childCount > CardConfig.DEFAULT_SHOW_ITEM) {
                for (int position = 1; position < childCount - 1; position++) {
                    int index = childCount - position - 1;
                    View view = recyclerView.getChildAt(position);
                    view.setScaleX(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);
                    view.setScaleY(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);

                   /* view.setScaleX(1 - index * CardConfig.DEFAULT_SCALE );
                    view.setScaleY(1 - index * CardConfig.DEFAULT_SCALE);*/
                    view.setTranslationY((index - Math.abs(ratio)) * itemView.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);
                }
            } else {
                // 当数据源个数小于或等于最大显示数时
                for (int position = 0; position < childCount - 1; position++) {
                    int index = childCount - position - 1;
                    View view = recyclerView.getChildAt(position);
                    view.setScaleX(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);
                    view.setScaleY(1 - index * CardConfig.DEFAULT_SCALE + Math.abs(ratio) * CardConfig.DEFAULT_SCALE);
                    view.setTranslationY((index - Math.abs(ratio)) * itemView.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);
                }
            }
            if (mListener != null) {
                if (ratio != 0) {
                  //  Log.d("mylog", "onChildDraw: 不为零");
                    mListener.onSwiping(viewHolder, ratio, ratio < 0 ? CardConfig.SWIPING_LEFT : CardConfig.SWIPING_RIGHT);
                } else {
                  //  Log.d("mylog", "onChildDraw: 为零");
                    mListener.onSwiping(viewHolder, ratio, CardConfig.SWIPING_NONE);
                }
            }
        }
    }

    @Override
    public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        super.clearView(recyclerView, viewHolder);
        viewHolder.itemView.setRotation(0f);
    }

    private float getThreshold(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        return recyclerView.getWidth() * getSwipeThreshold(viewHolder);
    }

}

自定义布局管理器:CardLayoutManager:

/**
 * 自定义布局管理器
 */

public class CardLayoutManager extends RecyclerView.LayoutManager {

    private RecyclerView mRecyclerView;
    private ItemTouchHelper mItemTouchHelper;

    public CardLayoutManager(@NonNull RecyclerView recyclerView, @NonNull ItemTouchHelper itemTouchHelper) {
        this.mRecyclerView = checkIsNull(recyclerView);
        this.mItemTouchHelper = checkIsNull(itemTouchHelper);
    }

    private <T> T checkIsNull(T t) {
        if (t == null) {
            throw new NullPointerException();
        }
        return t;
    }

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

    @Override
    public void onLayoutChildren(final RecyclerView.Recycler recycler, RecyclerView.State state) {
        detachAndScrapAttachedViews(recycler);
        int itemCount = getItemCount();
        // 当数据源个数大于最大显示数时
        if (itemCount > CardConfig.DEFAULT_SHOW_ITEM) {
            for (int position = CardConfig.DEFAULT_SHOW_ITEM; position >= 0; position--) {
                final View view = recycler.getViewForPosition(position);
                addView(view);
                measureChildWithMargins(view, 0, 0);
                int widthSpace = getWidth() - getDecoratedMeasuredWidth(view);
                int heightSpace = getHeight() - getDecoratedMeasuredHeight(view);
                // recyclerview 布局
                layoutDecoratedWithMargins(view, widthSpace / 2, heightSpace / 2,
                        widthSpace / 2 + getDecoratedMeasuredWidth(view),
                        heightSpace / 2 + getDecoratedMeasuredHeight(view));

                if (position == CardConfig.DEFAULT_SHOW_ITEM) {
                    view.setScaleX(1 - (position - 1) * CardConfig.DEFAULT_SCALE);
                    view.setScaleY(1 - (position - 1) * CardConfig.DEFAULT_SCALE);
                    view.setTranslationY((position - 1) * view.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);
                } else if (position > 0) {
                    view.setScaleX(1 - position * CardConfig.DEFAULT_SCALE);
                    view.setScaleY(1 - position * CardConfig.DEFAULT_SCALE);
                    view.setTranslationY(position * view.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);
                } else {
                    view.setOnTouchListener(mOnTouchListener);
                }
            }
        } else {
            // 当数据源个数小于或等于最大显示数时
            for (int position = itemCount - 1; position >= 0; position--) {
                final View view = recycler.getViewForPosition(position);
                addView(view);
                measureChildWithMargins(view, 0, 0);
                int widthSpace = getWidth() - getDecoratedMeasuredWidth(view);
                int heightSpace = getHeight() - getDecoratedMeasuredHeight(view);
                // recyclerview 布局
                layoutDecoratedWithMargins(view, widthSpace / 2, heightSpace / 2,
                        widthSpace / 2 + getDecoratedMeasuredWidth(view),
                        heightSpace / 2 + getDecoratedMeasuredHeight(view));

                if (position > 0) {
                    view.setScaleX(1 - position * CardConfig.DEFAULT_SCALE);
                    view.setScaleY(1 - position * CardConfig.DEFAULT_SCALE);
                    view.setTranslationY(position * view.getMeasuredHeight() / CardConfig.DEFAULT_TRANSLATE_Y);
                } else {
                    view.setOnTouchListener(mOnTouchListener);
                }
            }
        }
    }

    private View.OnTouchListener mOnTouchListener = new View.OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            RecyclerView.ViewHolder childViewHolder = mRecyclerView.getChildViewHolder(v);
            if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_DOWN) {
                mItemTouchHelper.startSwipe(childViewHolder);
            }
            return false;
        }
    };

}

状态回调接口:OnSwipeListener

/**
 * @author 状态回调接口
 */

public interface OnSwipeListener<T> {

    /**
     * 卡片还在滑动时回调
     *
     * @param viewHolder 该滑动卡片的viewHolder
     * @param ratio      滑动进度的比例
     * @param direction  卡片滑动的方向，CardConfig.SWIPING_LEFT 为向左滑，CardConfig.SWIPING_RIGHT 为向右滑，
     *                   CardConfig.SWIPING_NONE 为不偏左也不偏右
     */
    void onSwiping(RecyclerView.ViewHolder viewHolder, float ratio, int direction);

    /**
     * 卡片完全滑出时回调
     *
     * @param viewHolder 该滑出卡片的viewHolder
     * @param t          该滑出卡片的数据
     * @param direction  卡片滑出的方向，CardConfig.SWIPED_LEFT 为左边滑出；CardConfig.SWIPED_RIGHT 为右边滑出
     */
    void onSwiped(RecyclerView.ViewHolder viewHolder, T t, int direction);

    /**
     * 所有的卡片全部滑出时回调
     */
    void onSwipedClear();

}

自定义条目图片样式:RoundImageView:

/**
 * 自定义图片样式，顶部圆角显示
 */

public class RoundImageView extends ImageView {

    private Path mPath;
    private RectF mRectF;
    /*圆角的半径，依次为左上角xy半径，右上角，右下角，左下角*/
    private float[] rids = new float[8];
    private PaintFlagsDrawFilter paintFlagsDrawFilter;

    public RoundImageView(Context context) {
        this(context, null);
    }

    public RoundImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RoundImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView);
        float mRadius = array.getDimension(R.styleable.RoundImageView_radius, 10);
        rids[0] = mRadius;
        rids[1] = mRadius;
        rids[2] = mRadius;
        rids[3] = mRadius;
        rids[4] = 0f;
        rids[5] = 0f;
        rids[6] = 0f;
        rids[7] = 0f;
        array.recycle();
        //用于绘制的类
        mPath = new Path();
        //抗锯齿
        paintFlagsDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
        //关闭硬件加速，同时其他地方依然享受硬件加速
        setLayerType(View.LAYER_TYPE_HARDWARE, null);
    }

    @Override
    protected void onDraw(Canvas canvas) {
     //   Log.d("mylog", "onDraw: ");
        //重置path
        mPath.reset();
        //p1:大小，p2:圆角，p3:CW:顺时针绘制path，CCW:逆时针
        mPath.addRoundRect(mRectF, rids, Path.Direction.CW);
        //添加抗锯齿
        canvas.setDrawFilter(paintFlagsDrawFilter);
        canvas.save();
        //该方法不支持硬件加速，如果开启会导致效果出不来，所以之前设置关闭硬件加速
        //Clip(剪切)的时机：通常理解的clip(剪切)，是对已经存在的图形进行clip的。
        // 但是，在android上是对canvas（画布）上进行clip的，要在画图之前对canvas进行clip，
        // 如果画图之后再对canvas进行clip不会影响到已经画好的图形。一定要记住clip是针对canvas而非图形
        //开始根据path裁剪
        canvas.clipPath(mPath);
        super.onDraw(canvas);
        canvas.restore();
    }

    int a,b;
    //执行在onDraw()之前
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
      //  Log.d("mylog", "onSizeChanged: ");
        a = w;
        b = h;
        mRectF = new RectF(0, 0, w, h);
        Log.d("mylog", "onSizeChanged: "+w+"-----"+h);
    }

}

MainActivity:

public class MainActivity extends AppCompatActivity {
    private List<Integer> list = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        initData();
    }
    private void initView() {
        final RecyclerView recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(new MyAdapter());
        CardItemTouchHelperCallback cardCallback = new CardItemTouchHelperCallback(recyclerView.getAdapter(), list);
        cardCallback.setOnSwipedListener(new OnSwipeListener<Integer>() {

            @Override
            public void onSwiping(RecyclerView.ViewHolder viewHolder, float ratio, int direction) {
                MyAdapter.MyViewHolder myHolder = (MyAdapter.MyViewHolder) viewHolder;
                viewHolder.itemView.setAlpha(1 - Math.abs(ratio) * 0.2f);
                if (direction == CardConfig.SWIPING_LEFT) {
                    myHolder.dislikeImageView.setAlpha(Math.abs(ratio));
                } else if (direction == CardConfig.SWIPING_RIGHT) {
                    myHolder.likeImageView.setAlpha(Math.abs(ratio));
                } else {
                    myHolder.dislikeImageView.setAlpha(0f);
                    myHolder.likeImageView.setAlpha(0f);
                }
            }

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, Integer o, int direction) {
                MyAdapter.MyViewHolder myHolder = (MyAdapter.MyViewHolder) viewHolder;
                viewHolder.itemView.setAlpha(1f);
                myHolder.dislikeImageView.setAlpha(0f);
                myHolder.likeImageView.setAlpha(0f);
                Toast.makeText(MainActivity.this, direction == CardConfig.SWIPED_LEFT ? "swiped left" : "swiped right", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onSwipedClear() {
                Toast.makeText(MainActivity.this, "data clear", Toast.LENGTH_SHORT).show();
                recyclerView.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        initData();
                        recyclerView.getAdapter().notifyDataSetChanged();
                    }
                }, 3000L);
            }

        });
        final ItemTouchHelper touchHelper = new ItemTouchHelper(cardCallback);
        final CardLayoutManager cardLayoutManager = new CardLayoutManager(recyclerView, touchHelper);
        recyclerView.setLayoutManager(cardLayoutManager);
        touchHelper.attachToRecyclerView(recyclerView);
    }


    private void initData() {
        list.add(R.drawable.img_avatar_01);
        list.add(R.drawable.img_avatar_02);
        list.add(R.drawable.img_avatar_03);
        list.add(R.drawable.img_avatar_04);
        list.add(R.drawable.img_avatar_05);
        list.add(R.drawable.img_avatar_06);
        list.add(R.drawable.img_avatar_07);
    }

    private class MyAdapter extends RecyclerView.Adapter {
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
            return new MyViewHolder(view);
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            ImageView avatarImageView = ((MyViewHolder) holder).avatarImageView;
            avatarImageView.setImageResource(list.get(position));
        }

        @Override
        public int getItemCount() {
            return list.size();
        }

        class MyViewHolder extends RecyclerView.ViewHolder {

            ImageView avatarImageView;
            ImageView likeImageView;
            ImageView dislikeImageView;

            MyViewHolder(View itemView) {
                super(itemView);
                avatarImageView = (ImageView) itemView.findViewById(R.id.iv_avatar);
                likeImageView = (ImageView) itemView.findViewById(R.id.iv_like);
                dislikeImageView = (ImageView) itemView.findViewById(R.id.iv_dislike);
            }

        }
    }
}

attrs:

<resources>
    <declare-styleable name="RoundImageView">
        <attr name="radius" format="reference|dimension" />
    </declare-styleable>
</resources>