RecycleView 嵌套RecycleView 实现item自动循环滚动_recyclerview 嵌套3个recyclerview 怎么滚动到里面某一个recyclervi

作者：很楠不爱3 | 2024-05-05 11:38:06

踩

recyclerview 嵌套3个recyclerview 怎么滚动到里面某一个recyclerview的item

利用RecyclerView实现无限循环滚动

一、先上效果图

二、GitHub地址

GitHub地址 https://github.com/MNXP/AutomaticRolling

三、思路

RecycleView实现，内部实现Runnable滚动
1

四、实现

1）内部实现Runnable

   static class AutoPollTask implements Runnable {
        private final WeakReference<AutoPollRecyclerView> mReference;
        /**
         * 使用弱引用持有外部类引用,防止内存泄漏
         */

        private AutoPollTask(AutoPollRecyclerView reference) {
            this.mReference = new WeakReference<>(reference);
        }
        @Override
        public void run() {
            AutoPollRecyclerView recyclerView = mReference.get();
            if (recyclerView != null && recyclerView.running) {
                recyclerView.scrollBy(2, 2);//每次滚动距离
                /**
                 * 判断是否为无限循环
                 */
                if (recyclerView.canRun){
                    /**
                     * 判断是否触底
                     */
                    if (isSlideToBottom(recyclerView)) {
                        /**跳至顶部*/
                        recyclerView.smoothScrollToPosition(0);
                    }
                }

                recyclerView.postDelayed(recyclerView.autoPollTask,TIME_AUTO_POLL);
            }
        }
    }

    /**判断Recycler是否滑动至最底部  是返回true  不是返回false*/
    public static boolean isSlideToBottom(RecyclerView recyclerView) {
        if (recyclerView == null) return false;
        if (recyclerView.computeVerticalScrollExtent() + recyclerView.computeVerticalScrollOffset()
                >= recyclerView.computeVerticalScrollRange())
            return true;
        return false;
    }
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

2）开启滚动

  //开启
    public void start() {
        if (running){
            return;
        }
        canRun = true;
        running = true;
        postDelayed(autoPollTask,TIME_AUTO_POLL);
    }
    public void setCanRun(boolean canRun){
        this.canRun = canRun;
    }1
2
3
4
5
6
7
8
9
10
11
12

3）设置最大高度（没用到可以去掉）

      @Override
    protected void onMeasure(int widthSpec, int heightSpec) {
        super.onMeasure(widthSpec, heightSpec);
        int heightMode = MeasureSpec.getMode(heightSpec);
        int heightSize = MeasureSpec.getSize(heightSpec);

        if (heightMode == MeasureSpec.EXACTLY) {
            heightSize = heightSize <= mMaxHeight ? heightSize
                    : (int) mMaxHeight;
        }

        if (heightMode == MeasureSpec.UNSPECIFIED) {
            heightSize = heightSize <= mMaxHeight ? heightSize
                    : (int) mMaxHeight;
        }
        if (heightMode == MeasureSpec.AT_MOST) {
            heightSize = heightSize <= mMaxHeight ? heightSize
                    : (int) mMaxHeight;
        }
        int maxHeightMeasureSpec = MeasureSpec.makeMeasureSpec(heightSize,
                heightMode);
        super.onMeasure(widthSpec, maxHeightMeasureSpec);
    }
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

4）自身Adapter设置

@Override
    public int getItemCount() {
        if (mData!=null){
            if (mData.size()<=3)
                return mData.size();
            else
                return mData.size()*20;//return Integer.MAX_VALUE;
        }else {
            return 0;
        }
    }
1
2
3
4
5
6
7
8
9
10
11
12

5）引用

autoPollRecyclerView = (AutoPollRecyclerView) itemView.findViewById(R.id.main_recycler);
autoPollRecyclerView.start();
autoPollRecyclerView.setNestedScrollingEnabled(false);
autoPollRecyclerView.setLayoutManager(new   LinearLayoutManager(context,LinearLayoutManager.VERTICAL, false));
((SimpleItemAnimator) autoPollRecyclerView.getItemAnimator()).setSupportsChangeAnimations(false);


/**
* 我的是超过3项开始滚动
*/
if (item.list.size() > 0) {
    if (item.list.size() <= 3) {
        viewHolder.autoPollRecyclerView.setCanRun(false);
    } else {
        viewHolder.autoPollRecyclerView.setCanRun(true);
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

6）自动滚动RecycleView完整代码

public class AutoPollRecyclerView extends RecyclerView {
    private static final long TIME_AUTO_POLL = 30;
    private AutoPollTask autoPollTask;
    private boolean running; //是否正在自动轮询
    private boolean canRun;//是否可以自动轮询,可在不需要的是否置false
    private int mMaxHeight;//最大高度
    public AutoPollRecyclerView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        autoPollTask = new AutoPollTask(this);
        mMaxHeight = dip2px(context,100);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        return false;
    }

    static class AutoPollTask implements Runnable {
        private final WeakReference<AutoPollRecyclerView> mReference;
        /**
         * 使用弱引用持有外部类引用,防止内存泄漏
         */

        private AutoPollTask(AutoPollRecyclerView reference) {
            this.mReference = new WeakReference<>(reference);
        }
        @Override
        public void run() {
            AutoPollRecyclerView recyclerView = mReference.get();
            if (recyclerView != null && recyclerView.running) {
                recyclerView.scrollBy(2, 2);//每次滚动距离
                /**
                 * 判断是否为无限循环
                 */
                if (recyclerView.canRun){
                    /**
                     * 判断是否触底
                     */
                    if (isSlideToBottom(recyclerView)) {
                        /**跳至顶部*/
                        recyclerView.smoothScrollToPosition(0);
                    }
                }

                recyclerView.postDelayed(recyclerView.autoPollTask,TIME_AUTO_POLL);
            }
        }
    }
    /**判断Recycler是否滑动至最底部  是返回true  不是返回false*/
    public static boolean isSlideToBottom(RecyclerView recyclerView) {
        if (recyclerView == null) return false;
        if (recyclerView.computeVerticalScrollExtent() + recyclerView.computeVerticalScrollOffset()
                >= recyclerView.computeVerticalScrollRange())
            return true;
        return false;
    }

    @Override
    protected void onMeasure(int widthSpec, int heightSpec) {
        super.onMeasure(widthSpec, heightSpec);
        int heightMode = MeasureSpec.getMode(heightSpec);
        int heightSize = MeasureSpec.getSize(heightSpec);

        if (heightMode == MeasureSpec.EXACTLY) {
            heightSize = heightSize <= mMaxHeight ? heightSize
                    : (int) mMaxHeight;
        }

        if (heightMode == MeasureSpec.UNSPECIFIED) {
            heightSize = heightSize <= mMaxHeight ? heightSize
                    : (int) mMaxHeight;
        }
        if (heightMode == MeasureSpec.AT_MOST) {
            heightSize = heightSize <= mMaxHeight ? heightSize
                    : (int) mMaxHeight;
        }
        int maxHeightMeasureSpec = MeasureSpec.makeMeasureSpec(heightSize,
                heightMode);
        super.onMeasure(widthSpec, maxHeightMeasureSpec);
    }

    //开启
    public void start() {
        if (running){
            return;
        }
        canRun = true;
        running = true;
        postDelayed(autoPollTask,TIME_AUTO_POLL);
    }
    public void setCanRun(boolean canRun){
        this.canRun = canRun;
    }


    /**
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
     */
    public int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106

7）小小的建议

 RecycleView实现，首页列表，加载图片有卡顿
 卡顿优化可以使用vLayout（阿里开源库）处理挺好的，它只要是用于处理列表不同布局
 vLayout地址   (https://github.com/alibaba/vlayout)
1
2
3

如有意见和建议，及时沟通。

本文内容由网友自发贡献，转载请注明出处：https://www.wpsshop.cn/w/很楠不爱3/article/detail/538659