我想在 RecyclerView 中创建 ViewPager (holder)，当我创建它并 ScrollView 寻呼机某行然后我滚动 RecyclerView 和一些重用组件的元素。
我的代码:
主 Activity
public class MainActivity extends AppCompatActivity {
private RecyclerView rcv;
private LinearLayoutManager llom;
private MainActivityAdapter adapter;
private List<String> list1 = new ArrayList<>();
private List<String> list2 = new ArrayList<>();
private List<String> list3 = new ArrayList<>();
private List<String> list4 = new ArrayList<>();
private List<String> list5 = new ArrayList<>();
private List<String> list6 = new ArrayList<>();
private List<String> list7 = new ArrayList<>();
private List<String> list8 = new ArrayList<>();
private List<String> list9 = new ArrayList<>();
private List<String> list10 = new ArrayList<>();
private HashMap<Integer, List<String>> hashMap = new HashMap<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list1.add("1");
list1.add("2");
list1.add("3");
list1.add("4");
list1.add("5");
list2.add("1");
list2.add("2");
list2.add("3");
list2.add("4");
list2.add("5");
list3.add("1");
list3.add("2");
list3.add("3");
list3.add("4");
list3.add("5");
list4.add("1");
list4.add("2");
list4.add("3");
list4.add("4");
list4.add("5");
list5.add("1");
list5.add("2");
list5.add("3");
list5.add("4");
list5.add("5");
list6.add("1");
list6.add("2");
list6.add("3");
list6.add("4");
list6.add("5");
list7.add("1");
list7.add("2");
list7.add("3");
list7.add("4");
list7.add("5");
list8.add("1");
list8.add("2");
list8.add("3");
list8.add("4");
list8.add("5");
list9.add("1");
list9.add("2");
list9.add("3");
list9.add("4");
list9.add("5");
list10.add("1");
list10.add("2");
list10.add("3");
list10.add("4");
list10.add("5");
hashMap.put(0,list1);
hashMap.put(1,list2);
hashMap.put(2,list3);
hashMap.put(3,list4);
hashMap.put(4,list5);
hashMap.put(5,list6);
hashMap.put(6,list7);
hashMap.put(7,list8);
hashMap.put(8,list9);
hashMap.put(9,list10);
rcv = (RecyclerView) findViewById(R.id.rcv);
llom = new LinearLayoutManager(this);
rcv.setLayoutManager(llom);
adapter = new MainActivityAdapter(this, hashMap);
rcv.setAdapter(adapter);
}
}
主 Activity 适配器
public class MainActivityAdapter extends RecyclerView.Adapter {
private Context context;
private static final int TEST = 0;
private HashMap<Integer, List<String>> hashMap;
public MainActivityAdapter(Context context, HashMap<Integer, List<String>> hashMap) {
this.context = context;
this.hashMap = hashMap;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new VpListItem(new ViewPagerListItem(context));
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((VpListItem) holder).fillData(hashMap.get(position), position);
}
@Override
public int getItemCount() {
return hashMap.size();
}
public static class VpListItem extends RecyclerView.ViewHolder {
private ViewPagerListItem otherArticlesListItem;
public VpListItem(ViewPagerListItem itemView) {
super(itemView);
this.otherArticlesListItem = itemView;
}
public void fillData(List<String> list, int position) {
otherArticlesListItem.fillData(list, position);
}
}
}
ViewPagerListItem
public class ViewPagerListItem extends RelativeLayout {
private Context context;
private WrapContentViewPager vp;
private ViewPagerAdapter adapter;
private List<String> list = new ArrayList<>();
public ViewPagerListItem(Context context) {
super(context);
this.context = context;
setupView();
}
public ViewPagerListItem(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
setupView();
}
public ViewPagerListItem(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
setupView();
}
private void setupView() {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.vp_list_item, this, true);
vp = (WrapContentViewPager) view.findViewById(R.id.vp);
adapter = new ViewPagerAdapter(context, list);
vp.setAdapter(adapter);
}
public void fillData(List<String> list, int id) {
vp.setId(id);
this.list.addAll(list);
adapter.notifyDataSetChanged();
}
}
ViewPagerAdapter
public class ViewPagerAdapter extends PagerAdapter {
private Context context;
private List<String> list;
public ViewPagerAdapter(Context context, List<String> list) {
this.context = context;
this.list = list;
}
@Override
public int getCount() {
return list.size();
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == (View) object;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public Object instantiateItem(ViewGroup container, final int position) {
CardListItem cardListItem = new CardListItem(context);
cardListItem.fillData(list.get(position));
container.addView(cardListItem);
return cardListItem;
}
}
CardListItem
public class CardListItem extends LinearLayout {
private Context context;
private TextView tv;
public CardListItem(Context context) {
super(context);
this.context = context;
setupView();
}
public CardListItem(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
setupView();
}
public CardListItem(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
setupView();
}
private void setupView() {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.card_list_item, this, true);
tv = (TextView) view.findViewById(R.id.tv);
}
public void fillData(String text) {
tv.setText(text);
}
}
然后我滚动 RecyclerView 一段时间它会滞后。然后我滚动 ViewPager 然后我滚动 RecyclerView 一些元素(ViewPager 不滚动)根据我的 ViewPager 改变滚动
谢谢。
最佳答案
我创建了示例项目，其中有 recycler view 两种类型的项目:
- 简单的 TextView
- 查看寻呼机
可以查一下here
这些 View 的膨胀是在适配器 View 中完成的:
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder viewHolder = null;
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
switch (viewType) {
case VIEW_TYPE_TEXT:
View userView = inflater.inflate(R.layout.item_recycler_text, parent, false);
viewHolder = new TextItemHolder(userView);
break;
case VIEW_TYPE_PAGER:
View blockbusterView = inflater.inflate(R.layout.item_recycler_pager, parent, false);
viewHolder = new PagerItemHolder(blockbusterView);
break;
}
return viewHolder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
switch (holder.getItemViewType()) {
case VIEW_TYPE_TEXT:
TextItemHolder textHolder = (TextItemHolder) holder;
configureTextItem(textHolder, position);
break;
case VIEW_TYPE_PAGER:
PagerItemHolder pagerHolder = (PagerItemHolder) holder;
configurePagerHolder(pagerHolder, position);
break;
}
}
private void configureTextItem(TextItemHolder holder, int position) {
Data data = mDataList.get(position);
if (!Check.isEmpty(data.getTextItem()))
holder.tvTitle.setText(data.getTextItem());
}
private void configurePagerHolder(PagerItemHolder holder, int position) {
Data data = mDataList.get(position);
CustomPagerAdapter adapter = new CustomPagerAdapter(data.getPagerItemList(), mContext);
holder.viewPager.setAdapter(adapter);
}
希望对您有所帮助..!
已编辑:
为了在 ViewPager 中恢复先前滚动的状态，当 Recycler View 中的项目我们必须:
- 重写
RecyclerView.Adapter的onViewRecycled方法 - 为滚动到的前一个位置维护一个散列。值可以称为:
if (mViewPageStates.containsKey(position))
holder.viewPager.setCurrentItem(mViewPageStates.get(position));
关于android - 如何在recyclerview中实现viewpager，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39587175/