RecyclerView简单实现卡片叠加移除效果(模仿探探)

用的是(自定义)RecyclerView实现的仿探探的卡片滑动移除:



首先,布局:

item布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:fresco="http://schemas.android.com/apk/res-auto"
android:layout_width="500dp"
android:layout_height="700dp"
android:orientation="vertical"
>
<com.facebook.drawee.view.SimpleDraweeView
android:id="@+id/cards_sim"
android:layout_width="500dp"
android:layout_height="600dp"
fresco:roundedCornerRadius="15dp"
android:layout_gravity="center_horizontal"
fresco:placeholderImage="@mipmap/ic_launcher"
/>
<LinearLayout
android:layout_width="500dp"
android:layout_height="wrap_content"
android:background="#fff"
android:orientation="vertical"
>
<TextView
android:id="@+id/cards_title"
android:background="@drawable/movietext"   //这个movietext,是自定义xml样式布局,下面有
android:layout_width="500dp"
android:layout_height="wrap_content"
android:textC
4000
olor="#000"
android:textSize="20dp"
android:paddingLeft="30dp"
android:paddingTop="20dp"
android:paddingBottom="20dp"
/>
</LinearLayout>
</LinearLayout>

上面那个注释说的:自定义xml样式布局:

res下,drawable下:创个文件:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<stroke android:width="1dp"  android:color="#333333" />
<corners android:radius="15dp"/>
</shape>
</item>
</selector>

自定义布局:

<?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/cardsmove_recyclerview"
android:layout_gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="800dp">
</android.support.v7.widget.RecyclerView>
<Button
android:id="@+id/btn_splace_cards"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:background="#0f0"
android:text="换一批"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

把自定义的布局放入Activity中的View里:

<com.example.jingdong.Find.CardsView.CardsMove   //这是自定义View的类名,加入到这里,直接能用,下边会有此类
android:id="@+id/cardsmove_show"
android:layout_width="match_parent"
android:layout_height="match_parent">
</com.example.jingdong.Find.CardsView.CardsMove>

控制每个item的变量,边距等等常量类:

package com.example.jingdong.Find.CardsView;

/**
* Created by Administrator on 2017/12/13 0013.
*/

public 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;
}

监视每个item滑动前,滑动后,下一个item的行动,要执行的一些操作,的一个过程类

package com.example.jingdong.Find.CardsView;

import android.graphics.Canvas;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.util.Log;
import android.view.View;

import java.util.List;

/**
* Created by Administrator on 2017/12/13 0013.
*/

public class CardItemTouchHelperCallback<T
20c9f
> 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 CardLayoutMannager) {
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);
}
}

这里是需要自己做一个布局管理者,不能用系统给的布局管理者,item是需要层叠加:

package com.example.jingdong.Find.CardsView;

import android.support.annotation.NonNull;
import android.support.v4.view.MotionEventCompat;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;

/**
* Created by Administrator on 2017/12/13 0013.
*/

public class CardLayoutMannager extends RecyclerView.LayoutManager{
private RecyclerView mRecyclerView;
private ItemTouchHelper mItemTouchHelper;

public CardLayoutMannager(@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;
}
};
}

和上边的一个回调类一起用的,配合使用的一个接口,回调到请求数据的页面,也就是配置RecyclerView的界面:

package com.example.jingdong.Find.CardsView;

import android.support.v7.widget.RecyclerView;

/**
* Created by Administrator on 2017/12/13 0013.
*/

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();
}

在这里:数据的Bean类就不放了,下面的网络请求路径给出了,在代码里,自己请求一下,看下数据类型,自己打个Bean类,如果请求路径无效了,自己换个,在下面有的地方需要加入泛型,泛型类型是Bean类,自己复制的时候注意,改一改泛型,不然会没数据

自定义View主页:

package com.example.jingdong.Find.CardsView;

import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

import com.example.jingdong.R;
import com.example.jingdong.RecyclerView.Precenter.RecyclerViewTuijianPrecenter;
import com.example.jingdong.RecyclerView.View.RecyclerViewIView;

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

/**
* Created by Administrator on 2017/12/13 0013.
*/

public class CardsMove extends LinearLayout implements RecyclerViewIView{

//网络请求路径,下面有给出的随机数方法,最后拼接到路径后面,自己注意一下.
String path = "http://api.svipmovie.com/front/columns/getVideoList.do?catalogId=402834815584e463015584e539330016&pnum=";
RecyclerView rv;
Button btn;
RecyclerViewAdpt adpt;
List<CardsBean.RetBean.ListBean> list;
RecyclerViewTuijianPrecenter rp;
Context context;
public CardsMove(Context context) {
this(context,null);
}

public CardsMove(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}

public CardsMove(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
InitView(context, attrs, defStyleAttr);
}

private void InitView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
this.context = context;
View v = View.inflate(context, R.layout.cardsmove,this);
rv = v.findViewById(R.id.cardsmove_recyclerview);
btn = v.findViewById(R.id.btn_splace_cards);
btn.setOnClickListener(new OnClickListener() {   //换一换按钮点击事件
@Override
public void onClick(View view) {
rp.gett(path+getNextPage(),CardsBean.class);
}
});

rp = new RecyclerViewTuijianPrecenter();   //MVP的P层
rp.attchView(this);  //绑定P层接口

rv.setItemAnimator(new DefaultItemAnimator());   //动画效果
list = new ArrayList<>();
adpt = new RecyclerViewAdpt(context,list);   //适配器(自己敲就行)
rv.setAdapter(adpt);
//监视item的行动的回调类
CardItemTouchHelperCallback cc = new CardItemTouchHelperCallback(rv.getAdapter(), list);
cc.setOnSwipedListener(new OnSwipeListener<CardsBean.RetBean.ListBean>() {   //尖括号中的泛型放

的和适配器的数据类型一样,注意,注意,注意,放入之后,在重写下边的方法
@Override
public void onSwiping(RecyclerView.ViewHolder viewHolder, float ratio, int direction) {
RecyclerViewAdpt.ViewHold vh = (RecyclerViewAdpt.ViewHold) viewHolder;
vh.itemView.setAlpha(1 - Math.abs(ratio) * 0.2f);
}

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, CardsBean.RetBean.ListBean listBean, int direction) {
RecyclerViewAdpt.ViewHold vh = (RecyclerViewAdpt.ViewHold) viewHolder;
vh.itemView.setAlpha(1f);
}

@Override
public void onSwipedClear() {
rv.postDelayed(new Runnable() {
@Override
public void run() {
rp.gett(path+getNextPage(),CardsBean.class);
}
},3000L);
}
});

ItemTouchHelper itemTouchHelper = new ItemTouchHelper(cc);   //这个我也不懂
CardLayoutMannager cardLayoutMannager = new CardLayoutMannager(rv, itemTouchHelper);   //自己定义的管理者
rv.setLayoutManager(cardLayoutMannager);
itemTouchHelper.attachToRecyclerView(rv);   //这个我也不懂,自己试一试,看用不用加

rp.gett(path+getNextPage(),CardsBean.class);
}

@Override
public void onChengo(Object object) {   //请求网络成功回调方法,刷新适配器
Log.e("CardsMove","卡片请求网络成功");
CardsBean cb = (CardsBean) object;
List<CardsBean.RetBean.ListBean> t = cb.getRet().getList();
if(t!=null||t.size()!=0){
if(list!=null||list.size()!=0){
list.clear();
}
list.addAll(t);
adpt.notifyDataSetChanged();
}

}

@Override
public void onShba(Exception exception) {
Log.e("CardsMove","卡片请求网络失败");
}

private int getNextPage() {   //随机数方法
int page = getRandomNumber(1, 108);
return page;
}
public static int getRandomNumber(int min, int max) {
return new Random().nextInt(max) % (max - min + 1) + min;
}

}