RecyclerView做的一个轮播效果，适配器有视图缓存，避免了一些内存问题

首先是借助 PagerSnapHelper 让RecyclerView每次只滑动一个，然后添加一个指示器，这里指示器是动态生成的，自己做了个简单的view

很简单的一个效果，直接上代码

public class ImageListAdapter extends BaseQuickAdapter
      
        {    private CallBack callBack;    public ImageListAdapter(int layoutResId,CallBack callBack) {        super(layoutResId);        this.callBack = callBack;    }    @Override    protected void convert(BaseViewHolder helper, String item) {        if (item != null && !item.isEmpty()){            MyPhotoView img =helper.getView(R.id.img_icon);            GlideApp.with(AndroidApplication.getInstance().getApplicationContext())                    .load(item)                    .skipMemoryCache(true)                    .fitCenter()                    .into(img);            img.setOnPhotoTapListener((view, x, y) -> callBack.click());        }    }    public interface CallBack{        void click();    }}
      

@Override    protected void initData() {        Bundle bundle = getArguments();        ArrayList
      
        list = bundle.getStringArrayList("Photo");        int position = bundle.getInt("Photo_p", 0);        adapter = new ImageListAdapter(R.layout.item_imagelist, new ImageListAdapter.CallBack() {            @Override            public void click() {                if (getActivity() != null) {                    getActivity().finish();                }            }        });        adapter.addData(list);        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false);        recyclerView.setLayoutManager(linearLayoutManager);        linearLayoutManager.scrollToPositionWithOffset(position, 0);        linearLayoutManager.setStackFromEnd(true);        recyclerView.setAdapter(adapter);        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {                super.onScrollStateChanged(recyclerView, newState);                if (newState == RecyclerView.SCROLL_STATE_IDLE && lin_indicate != null) {
    //不滑动的时候，避免多次触发                    int lastItemPosition = linearLayoutManager.findLastCompletelyVisibleItemPosition();                    lin_indicate.setIndicatePosition(lastItemPosition);                }            }        });        new PagerSnapHelper().attachToRecyclerView(recyclerView);        int count = list.size();        lin_indicate.load(count,position);        adapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {            @Override            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {                if (getActivity() != null) {                    getActivity().finish();                }            }        });    }
      

public class LinIndicate extends LinearLayout {    public LinIndicate(Context context) {        super(context);    }    public LinIndicate(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public LinIndicate(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public void load(int count){        removeAllViews();        for (int i = 0; i < count; i++) {            ImageView imageView = new ImageView(getContext());            ViewGroup.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);            imageView.setLayoutParams(params);            imageView.setPadding(10,10,10,20);            addView(imageView);        }    }    /**     * @param count 指示器数量     * @param position 默认显示下标     */    public void load(int count,int position){        removeAllViews();        for (int i = 0; i < count; i++) {            ImageView imageView = new ImageView(getContext());            ViewGroup.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);            imageView.setLayoutParams(params);            imageView.setPadding(10,10,10,20);            addView(imageView);        }        setIndicatePosition(position);    }    public void setIndicatePosition(int position){        int count = getChildCount();        if (position > count)            return;        for (int i = 0; i < count; i++) {            ImageView imageView = (ImageView) getChildAt(i);            if (position == i){                imageView.setImageResource(R.mipmap.ic_page_indicator_focused);            }else{                imageView.setImageResource(R.mipmap.ic_page_indicator);            }        }    }}

虽然简单，但是也记录一下，说不定哪天就能帮上忙呢，有的时候遇到很多问题解决过但是想不起来，可是当你看到相关联的一些代码，或许记忆片段就来了