RecyclerView使用详解 各种布局

RecyclerView是support:recyclerview-v7中提供的控件，最低兼容到android 3.0版本。

官方介绍RecyclerView为在有限的窗口展现大量数据的控件。拥有类似功能的控件有ListView、GridView以及被Google遗弃的Gallery等，为毛已经有了它们，Google还推出RecyclerView呢，那就要说说RecyclerView所具有的一些优势了。

那RecyclerView到底有啥优势呢？总结起来六颗字：低耦合高类聚。RecyclerView已经标准化ViewHolder，我们自定义的ViewHoler需要继承 RecyclerView.ViewHolder，然后在构造方法中初始化控件，后面会有具体介绍。通过设置不同的LayoutManager，以及结合ItemDecoration , ItemAnimator，ItemTouchHelper，可以实现非常炫酷的效果，这些是ListView等控件难以企及的。

基本使用：

1.使用前需要在在gradle中添加依赖

 

implementation 'com.android.support:recyclerview-v7:27.0.2'

2.编写代码，首先我们需要在Xml中写RecyclerView的布局，

1.  
   < android.support.v7.widget.RecyclerView
2.  
   android:id= "@+id/recyclerView"
3.  
   android:layout_width= "match_parent"
4.  
   android:layout_height= "match_parent"/>

然后在activity中获取RecyclerView，并设置LayoutManager以及adapter

 

1.  
   //通过findViewById拿到RecyclerView实例
2.  
   mRecyclerView = findViewById(R.id.recyclerView);
3.  
   //设置RecyclerView管理器
4.  
   mRecyclerView.setLayoutManager( new LinearLayoutManager( this, LinearLayoutManager.VERTICAL, false));
5.  
   //初始化适配器
6.  
   mAdapter = new MyRecyclerViewAdapter(list);
7.  
   //设置添加或删除item时的动画，这里使用默认动画
8.  
   mRecyclerView.setItemAnimator( new DefaultItemAnimator());
9.  
   //设置适配器
10.  
    mRecyclerView.setAdapter(mAdapter);

下面是MyRecyclerViewAdapter的代码：

 

 

1.  
   package com.sharejoys.recyclerviewdemo.actvity;
2.  
    
3.  
   import android.support.v7.widget.RecyclerView;
4.  
   import android.view.LayoutInflater;
5.  
   import android.view.View;
6.  
   import android.view.ViewGroup;
7.  
   import android.widget.TextView;
8.  
    
9.  
   import com.sharejoys.recyclerviewdemo.R;
10.  
     
11.  
    import java.util.List;
12.  
     
13.  
    /**
14.  
    * Created by 青青-子衿 on 2018/1/15.
15.  
    */
16.  
     
17.  
     
18.  
    public class MyRecyclerViewAdapterextends RecyclerView. Adapter< MyAdapter. ViewHolder> {
19.  
    private List list;
20.  
     
21.  
    public MyAdapter(List list) {
22.  
    this.list = list;
23.  
    }
24.  
     
25.  
    @Override
26.  
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
27.  
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_base_use, parent, false);
28.  
    MyAdapter.ViewHolder viewHolder = new MyAdapter.ViewHolder(view);
29.  
    return viewHolder;
30.  
    }
31.  
     
32.  
    @Override
33.  
    public void onBindViewHolder(MyAdapter.ViewHolder holder, int position) {
34.  
    holder.mText.setText(list.get(position));
35.  
    }
36.  
     
37.  
    @Override
38.  
    public int getItemCount() {
39.  
    return list.size();
40.  
    }
41.  
     
42.  
    class ViewHolder extends RecyclerView. ViewHolder {
43.  
    TextView mText;
44.  
    ViewHolder(View itemView) {
45.  
    super(itemView);
46.  
    mText = itemView.findViewById(R.id.item_tx);
47.  
    }
48.  
    }
49.  
    }

这里item_normal的布局也非常简单

1.  
   xml version= "1.0" encoding= "utf-8" ?>
2.  
   < LinearLayout
3.  
   xmlns:android= "http://schemas.android.com/apk/res/android"
4.  
   android:layout_width= "match_content"
5.  
   android:layout_height= "wrap_content"
6.  
   android:orientation= "vertical">
7.  
    
8.  
   < TextView
9.  
   android:id= "@+id/item_tx"
10.  
    android:layout_width= "match_content"
11.  
    android:layout_height= "wrap_content"
12.  
    android:gravity= "center"
13.  
    android:padding= "10dp"
14.  
    android:layout_gravity= "center_horizontal"
15.  
    android:text= "Item"/>
16.  
     
17.  
    LinearLayout>

然后我们运行效果如下

从例子也可以看出来，RecyclerView的用法并不比ListView复杂，反而更灵活好用，它将数据、排列方式、数据的展示方式都分割开来，因此可定制型，自定义的形式也非常多，非常灵活。

 

 

 

设置横向布局：

 

 mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));

 

设置网格布局：

 

 

 mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));

设置瀑布流：

 mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));

如果第二个参数可以设置为横向的，则效果如下：

从以上可知，我们可以通过设置不同的管理器，实现不同的效果
LinearLayoutManager：以线性布局展示，可以设置横向和纵向
GridLayoutManager：以网格形式展示，类似GridView效果
StaggeredGridLayoutManager：以瀑布流形式的效果

RecyclerView条目之间默认没有分割线，那是否可以像ListView一样设置divider以及dividerHight搞一条分割线出来呢，答案是不可以的，google并没有提供这样的属性。但是谷歌为我们提供了可以定制的解决办法，那就是以下要说ItemDecoration

 

 

 

利用ItemDecoration实现条目分割线

ItemDecoration是谷歌定义的可用于画分割线的类， 是抽象的，需要我们自己去实现

 

1.  
   /**
2.  
   * An ItemDecoration allows the application to add a special drawing and layout offset
3.  
   * to specific item views from the adapter's data set. This can be useful for drawing dividers
4.  
   * between items, highlights, visual grouping boundaries and more.
5.  
   *
6.  
   *

   All ItemDecorations are drawn in the order they were added, before the item

7.  
   * views (in {@link ItemDecoration#onDraw(Canvas, RecyclerView, RecyclerView.State) onDraw()}
8.  
   * and after the items (in {@link ItemDecoration#onDrawOver(Canvas, RecyclerView,
9.  
   * RecyclerView.State)}.

10.  
    */
11.  
    public abstract static class ItemDecoration {
12.  
    public void onDraw(Canvas c, RecyclerView parent, State state) {
13.  
    onDraw(c, parent);
14.  
    }
15.  
    @Deprecated
16.  
    public void onDraw(Canvas c, RecyclerView parent) {
17.  
    }
18.  
     
19.  
    public void onDrawOver(Canvas c, RecyclerView parent, State state) {
20.  
    onDrawOver(c, parent);
21.  
    }
22.  
     
23.  
    @Deprecated
24.  
    public void onDrawOver(Canvas c, RecyclerView parent) {
25.  
    }
26.  
     
27.  
     
28.  
    @Deprecated
29.  
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
30.  
    outRect.set( 0, 0, 0, 0);
31.  
    }
32.  
     
33.  
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, State state) {
34.  
    getItemOffsets(outRect, ((LayoutParams) view.getLayoutParams()).getViewLayoutPosition(),
35.  
    parent);
36.  
    }
37.  
    }

当我们通过

mRecyclerView.addItemDecoration();

    onDraw: 该方法可以在RecyclerView的画布上画任何装饰，且是在 the item views 被绘制之前回调
    onDrawOver:该方法可以在RecyclerView的画布上画任何装饰，且是在 the item views 被绘制之后回调
    getItemOffsets :可以在该方法中为the item views添加偏移量

下面我们可以就通过继承ItemDecoration为RecyclerView添加分割线。
DividerItemDecoration的代码如下： 

 

 

 

 

1.  
   package com.sharejoys.mvpdemo.ui.customview;
2.  
    
3.  
   import android.content.Context;
4.  
   import android.content.res.TypedArray;
5.  
   import android.graphics.Canvas;
6.  
   import android.graphics.Rect;
7.  
   import android.graphics.drawable.Drawable;
8.  
   import android.support.annotation.IntDef;
9.  
   import android.support.v4.view.ViewCompat;
10.  
    import android.support.v7.widget.LinearLayoutManager;
11.  
    import android.support.v7.widget.RecyclerView;
12.  
    import android.view.View;
13.  
     
14.  
    /**
15.  
    * Date: 2018/1/14
16.  
    *
17.  
    * @author 青青-子衿
18.  
    * @since 1.0
19.  
    */
20.  
     
21.  
    public class DividerItemDecoration extends RecyclerView. ItemDecoration {
22.  
    @OrientationType
23.  
    private int mOrientation = LinearLayoutManager.VERTICAL;
24.  
    private Drawable mDivider;
25.  
     
26.  
    private int[] attrs = new int[]{
27.  
    android.R.attr.listDivider
28.  
    };
29.  
     
30.  
    public DividerItemDecoration(Context context, @OrientationType int orientation) {
31.  
    TypedArray typedArray = context.obtainStyledAttributes(attrs);
32.  
    mDivider = typedArray.getDrawable( 0);
33.  
    typedArray.recycle();
34.  
    setOrientation(orientation);
35.  
    }
36.  
     
37.  
    private void setOrientation(@OrientationType int orientation) {
38.  
    if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) {
39.  
    throw new IllegalArgumentException( "传入的布局类型不合法");
40.  
    }
41.  
    this.mOrientation = orientation;
42.  
    }
43.  
     
44.  
    @Override
45.  
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
46.  
    //调用这个绘制方法，RecyclerView会回调该绘制方法，需要我们自己去绘制条目的间隔线
47.  
    if (mOrientation == LinearLayoutManager.VERTICAL) {
48.  
    //垂直
49.  
    drawVertical(c, parent);
50.  
    } else {
51.  
    //水平
52.  
    drawHorizontal(c, parent);
53.  
    }
54.  
    }
55.  
     
56.  
    private void drawVertical(Canvas c, RecyclerView parent) {
57.  
    // 画水平线
58.  
    int left = parent.getPaddingLeft();
59.  
    int right = parent.getWidth() - parent.getPaddingRight();
60.  
    int childCount = parent.getChildCount();
61.  
    for ( int i = 0; i < childCount; i++) {
62.  
    View child = parent.getChildAt(i);
63.  
     
64.  
    RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
65.  
    int top = child.getBottom() + params.bottomMargin + Math.round(ViewCompat.getTranslationY(child));
66.  
    int bottom = top + mDivider.getIntrinsicHeight();
67.  
    mDivider.setBounds(left, top, right, bottom);
68.  
    mDivider.draw(c);
69.  
    }
70.  
    }
71.  
     
72.  
    private void drawHorizontal(Canvas c, RecyclerView parent) {
73.  
    int top = parent.getPaddingTop();
74.  
    int bottom = parent.getHeight() - parent.getPaddingBottom();
75.  
    int childCount = parent.getChildCount();
76.  
    for ( int i = 0; i < childCount; i++) {
77.  
    View child = parent.getChildAt(i);
78.  
     
79.  
    RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
80.  
    int left = child.getRight() + params.rightMargin + Math.round(ViewCompat.getTranslationX(child));
81.  
    int right = left + mDivider.getIntrinsicHeight();
82.  
    mDivider.setBounds(left, top, right, bottom);
83.  
    mDivider.draw(c);
84.  
    }
85.  
    }
86.  
     
87.  
    @Override
88.  
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
89.  
    //获得条目的偏移量（所有的条目都会回调一次该方法）
90.  
    if (mOrientation == LinearLayoutManager.VERTICAL) {
91.  
    //垂直
92.  
    outRect.set( 0, 0, 0, mDivider.getIntrinsicHeight());
93.  
    } else {
94.  
    //水平
95.  
    outRect.set( 0, 0, mDivider.getIntrinsicWidth(), 0);
96.  
    }
97.  
    }
98.  
     
99.  
    @IntDef({LinearLayoutManager.VERTICAL, LinearLayoutManager.HORIZONTAL})
100.  
     public @interface OrientationType {
101.  
     }
102.  
     }

然后在activity设置水平方向

 

 

1.  
   mRecyclerView.setLayoutManager( new LinearLayoutManager( this, LinearLayoutManager.VERTICAL, false);
2.  
   mRecyclerView.addItemDecoration( new DividerItemDecoration( this, LinearLayoutManager.VERTICAL));

竖直方向：

 

 

1.  
   mRecyclerView.setLayoutManager( new LinearLayoutManager( this, LinearLayoutManager.HORIZONAL, false);
2.  
   mRecyclerView.addItemDecoration( new DividerItemDecoration( this, LinearLayoutManager.HORIZONAL))

这里的分割线是默认的，我们可以在主题中去设置分割线的颜色

1.  
2.  
   < style name= "AppTheme" parent= "Theme.AppCompat.Light.DarkActionBar">
3.  
4.  
   < item name= "colorPrimary">@color/colorPrimaryitem>
5.  
   < item name= "colorPrimaryDark">@color/colorPrimaryDarkitem>
6.  
   < item name= "colorAccent">@color/colorAccentitem>
7.  
   < item name= "android:listDivider">@drawable/bg_recyclerview_divideritem>
8.  
   style>

bg_recyclerview_divider.xml

 

 

1.  
   xml version= "1.0" encoding= "utf-8" ?>
2.  
   < shape xmlns:android= "http://schemas.android.com/apk/res/android"
3.  
   android:shape= "rectangle">
4.  
    
5.  
   < gradient
6.  
   android:centerColor= "#ff00ff00"
7.  
   android:endColor= "#ff0000ff"
8.  
   android:startColor= "#ffff0000"
9.  
   android:type= "linear"/>
10.  
     
11.  
    < size
12.  
    android:width= "10dp"
13.  
    android:height= "10dp"/>
14.  
     
15.  
    shape>

运行后效果如下

以上的分割线只适用在LinearLayoutManager的相关布局中。
对于GridLayoutManager布局是不适用的。需要我们单独写一个。

 

以下是对于GridLayoutManager布局的分割线代码

 

1.  
   package com.sharejoys.recyclerviewdemo.view;
2.  
    
3.  
   import android.content.Context;
4.  
   import android.content.res.TypedArray;
5.  
   import android.graphics.Canvas;
6.  
   import android.graphics.Rect;
7.  
   import android.graphics.drawable.Drawable;
8.  
   import android.support.v7.widget.GridLayoutManager;
9.  
   import android.support.v7.widget.RecyclerView;
10.  
    import android.view.View;
11.  
     
12.  
    /**
13.  
    * Date: 2018/1/14
14.  
    *
15.  
    * @author 青青-子衿
16.  
    * @since 1.0
17.  
    */
18.  
     
19.  
    public class DividerGridViewItemDecoration extends RecyclerView. ItemDecoration {
20.  
    private Drawable mDivider;
21.  
    private int[] attrs = new int[]{
22.  
    android.R.attr.listDivider};
23.  
     
24.  
    public DividerGridViewItemDecoration(Context context) {
25.  
    TypedArray typedArray = context.obtainStyledAttributes(attrs);
26.  
    mDivider = typedArray.getDrawable( 0);
27.  
    typedArray.recycle();
28.  
    }
29.  
     
30.  
    @Override
31.  
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
32.  
    drawVertical(c, parent);
33.  
    drawHorizontal(c, parent);
34.  
    }
35.  
     
36.  
    private void drawVertical(Canvas c, RecyclerView parent) {
37.  
    //绘制垂直间隔线（垂直的矩形）
38.  
    int childCount = parent.getChildCount();
39.  
    for ( int i = 0; i < childCount; i++) {
40.  
    View child = parent.getChildAt(i);
41.  
    RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
42.  
    int left = child.getRight() + params.rightMargin;
43.  
    int right = left + mDivider.getIntrinsicWidth();
44.  
    int top = child.getTop() - params.topMargin;
45.  
    int bottom = child.getBottom() + params.bottomMargin;
46.  
     
47.  
    mDivider.setBounds(left, top, right, bottom);
48.  
    mDivider.draw(c);
49.  
    }
50.  
    }
51.  
     
52.  
    private void drawHorizontal(Canvas c, RecyclerView parent) {
53.  
    //绘制水平分割线
54.  
    int childCount = parent.getChildCount();
55.  
    for ( int i = 0; i < childCount; i++) {
56.  
    View child = parent.getChildAt(i);
57.  
    RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
58.  
    int left = child.getLeft() - params.leftMargin;
59.  
    int right = child.getRight() + params.rightMargin + mDivider.getIntrinsicWidth();
60.  
    int top = child.getBottom() + params.bottomMargin;
61.  
    int bottom = top + mDivider.getIntrinsicHeight();
62.  
     
63.  
    mDivider.setBounds(left, top, right, bottom);
64.  
    mDivider.draw(c);
65.  
    }
66.  
    }
67.  
     
68.  
    @Override
69.  
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
70.  
    // 四个方向的偏移值
71.  
    int right = mDivider.getIntrinsicWidth();
72.  
    int bottom = mDivider.getIntrinsicHeight();
73.  
     
74.  
    RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
75.  
    int itemPosition = params.getViewAdapterPosition();
76.  
    if (isLastColum(itemPosition, parent)) {
77.  
    right = 0;
78.  
    }
79.  
     
80.  
    if (isLastRow(itemPosition, parent)) {
81.  
    bottom = 0;
82.  
    }
83.  
    outRect.set( 0, 0, right, bottom);
84.  
    }
85.  
     
86.  
    /**
87.  
    * 是否最后一行
88.  
    */
89.  
    private boolean isLastRow( int itemPosition, RecyclerView parent) {
90.  
    int spanCount = getSpanCount(parent);
91.  
    if (spanCount != - 1) {
92.  
    int childCount = parent.getAdapter().getItemCount();
93.  
    int lastRowCount = childCount % spanCount;
94.  
    //最后一行的数量小于spanCount
95.  
    if (lastRowCount == 0 || lastRowCount < spanCount) {
96.  
    return true;
97.  
    }
98.  
    }
99.  
     
100.  
     return false;
101.  
     }
102.  
      
103.  
      
104.  
     /**
105.  
     * 根据parent获取到列数
106.  
     */
107.  
     private int getSpanCount(RecyclerView parent) {
108.  
     RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
109.  
     if (layoutManager instanceof GridLayoutManager) {
110.  
     GridLayoutManager lm = (GridLayoutManager) layoutManager;
111.  
     int spanCount = lm.getSpanCount();
112.  
     return spanCount;
113.  
     }
114.  
     return - 1;
115.  
     }
116.  
      
117.  
     /**
118.  
     * 判断是否是最后一列
119.  
     */
120.  
     private boolean isLastColum( int itemPosition, RecyclerView parent) {
121.  
     int spanCount = getSpanCount(parent);
122.  
     if (spanCount != - 1) {
123.  
     if ((itemPosition + 1) % spanCount == 0) {
124.  
     return true;
125.  
     }
126.  
     }
127.  
     return false;
128.  
     }
129.  
     }

我们在activity中使用该分割线

 

 

1.  
   mRecyclerView.setLayoutManager( new GridLayoutManager( this, 3));
2.  
   mRecyclerView.addItemDecoration( new DividerGridViewItemDecoration( this));

点击事件

RecyclerView并没有像ListView的那样可以设置点击事件以及长按点击事件，这个需要我们可以在adapter中去设置回调的方式实现，具体代码如下：
MyRecyclerViewAdapter的代码如下：

 

 

1.  
   package com.sharejoys.recyclerviewdemo.actvity;
2.  
    
3.  
   import android.support.v7.widget.RecyclerView;
4.  
   import android.view.LayoutInflater;
5.  
   import android.view.View;
6.  
   import android.view.ViewGroup;
7.  
   import android.widget.TextView;
8.  
    
9.  
   import com.sharejoys.recyclerviewdemo.R;
10.  
     
11.  
    import java.util.List;
12.  
     
13.  
    /**
14.  
    * Created by 青青-子衿 on 2018/1/15.
15.  
    */
16.  
     
17.  
     
18.  
    public class MyRecyclerViewAdapter extends RecyclerView. Adapter< MyRecyclerViewAdapter. ViewHolder> {
19.  
    private List list;
20.  
    private OnItemClickListener onItemClickListener;
21.  
    private OnItemLongClickListener onItemLongClickListener;
22.  
     
23.  
    /**
24.  
    * 设置点击事件
25.  
    */
26.  
    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
27.  
    this.onItemClickListener = onItemClickListener;
28.  
    }
29.  
     
30.  
    /**
31.  
    * 设置长按点击事件
32.  
    */
33.  
    public void setOnItemLongClickListener(OnItemLongClickListener onItemLongClickListener) {
34.  
    this.onItemLongClickListener = onItemLongClickListener;
35.  
    }
36.  
     
37.  
    public MyRecyclerViewAdapter(List list) {
38.  
    this.list = list;
39.  
    }
40.  
     
41.  
    @Override
42.  
    public MyRecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
43.  
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_base_use, parent, false);
44.  
    MyRecyclerViewAdapter.ViewHolder viewHolder = new MyRecyclerViewAdapter.ViewHolder(view);
45.  
    return viewHolder;
46.  
    }
47.  
     
48.  
    @Override
49.  
    public void onBindViewHolder(MyRecyclerViewAdapter.ViewHolder holder, int position) {
50.  
    holder.mText.setText(list.get(position));
51.  
    int adapterPosition = holder.getAdapterPosition();
52.  
    if (onItemClickListener != null) {
53.  
    holder.itemView.setOnClickListener( new MyOnClickListener(position, list.get(adapterPosition)));
54.  
    }
55.  
    if (onItemLongClickListener != null) {
56.  
    holder.itemView.setOnLongClickListener( new MyOnLongClickListener(position, list.get(adapterPosition)));
57.  
    }
58.  
    }
59.  
     
60.  
    @Override
61.  
    public int getItemCount() {
62.  
    return list.size();
63.  
    }
64.  
     
65.  
    class ViewHolder extends RecyclerView. ViewHolder {
66.  
    TextView mText;
67.  
     
68.  
    ViewHolder(View itemView) {
69.  
    super(itemView);
70.  
    mText = itemView.findViewById(R.id.item_tx);
71.  
    }
72.  
    }
73.  
     
74.  
    private class MyOnLongClickListener implements View. OnLongClickListener {
75.  
    private int position;
76.  
    private String data;
77.  
     
78.  
    public MyOnLongClickListener( int position, String data) {
79.  
    this.position = position;
80.  
    this.data = data;
81.  
    }
82.  
     
83.  
    @Override
84.  
    public boolean onLongClick(View v) {
85.  
    onItemLongClickListener.onItemLongClick(v, position, data);
86.  
    return true;
87.  
    }
88.  
    }
89.  
     
90.  
    private class MyOnClickListener implements View. OnClickListener {
91.  
    private int position;
92.  
    private String data;
93.  
     
94.  
    public MyOnClickListener( int position, String data) {
95.  
    this.position = position;
96.  
    this.data = data;
97.  
    }
98.  
     
99.  
    @Override
100.  
     public void onClick(View v) {
101.  
     onItemClickListener.onItemClick(v, position, data);
102.  
     }
103.  
     }
104.  
      
105.  
      
106.  
     public interface OnItemClickListener {
107.  
     void onItemClick(View view, int position, String data);
108.  
     }
109.  
      
110.  
     public interface OnItemLongClickListener {
111.  
     void onItemLongClick(View view, int position, String data);
112.  
     }
113.  
      
114.  
     }

 

activity中设置监听：

 

 

1.  
   mAdapter.setOnItemClickListener( new MyRecyclerViewAdapter.OnItemClickListener() {
2.  
   @Override
3.  
   public void onItemClick(View view, int position, String data) {
4.  
   Toast.makeText(MainActivity. this, "您点击了： " + data, Toast.LENGTH_SHORT).show();
5.  
   }
6.  
   });
7.  
   mAdapter.setOnItemLongClickListener( new MyRecyclerViewAdapter.OnItemLongClickListener() {
8.  
   @Override
9.  
   public void onItemLongClick(View view, int position, String data) {
10.  
    Toast.makeText(MainActivity. this, "您长按点击了： " + data, Toast.LENGTH_SHORT).show();
11.  
    }
12.  
    });

运行后效果如下：

ItemAnimator

 

我们可以为RecyclerView设置增加和删除动画，这里我们可以使用默认动画
 

1.  
   //设置添加或删除item时的动画，这里使用默认动画
2.  
   mRecyclerView.setItemAnimator( new DefaultItemAnimator());

然后在Adapter中增加删除和添加数据的方法

 

 

1.  
   /**
2.  
   * 插入一条数据
3.  
   *
4.  
   * @param index 下标
5.  
   * @param s 数据
6.  
   */
7.  
   public void addItem( int index, String s) {
8.  
   list.add(index, s);
9.  
   notifyItemInserted(index);
10.  
    }
11.  
     
12.  
    /**
13.  
    * 删除一条数据
14.  
    *
15.  
    * @param index 下标
16.  
    */
17.  
    public void deleteItem( int index) {
18.  
    list.remove(index);
19.  
    notifyItemRemoved(index);
20.  
    }

activty调用删除和添加方法后效果如下

 

 

RecycleView还有一些其他用法，比如结合ItemTouchHelper实现item的拖拽效果，可以自定义增加header和footer（类似Listview）

作者地址：https://blog.csdn.net/tuike/article/details/79064750