我使用 DialogFragment 方法实现了 BottomSheet。在 BottomSheet 中，我有一个 TabLayout 和一个 ViewPager ，其中 ViewPager 包含 2 个页面，每个页面都有一个 RecyclerView。第一个页面（Coffee 标签）的 RecyclerView 可以正常滚动，但是我现在遇到的问题是第二个页面（Milk 标签）的滚动不起作用。您有什么想法可以解决这个问题吗？谢谢！
您可以使用我创建的演示项目进行测试：https://github.com/choongyouqi/bottomsheet
使用此视图作为根视图：
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.LinearLayout;
public class DisallowInterceptView extends LinearLayout {
public DisallowInterceptView(Context context) {
super(context);
requestDisallowInterceptTouchEvent(true);
}
public DisallowInterceptView(Context context, AttributeSet attrs) {
super(context, attrs);
requestDisallowInterceptTouchEvent(true);
}
public DisallowInterceptView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
requestDisallowInterceptTouchEvent(true);
}
public boolean dispatchTouchEvent(MotionEvent ev) {
getParent().requestDisallowInterceptTouchEvent(true);
return super.dispatchTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
requestDisallowInterceptTouchEvent(false);
break;
}
return super.onTouchEvent(event);
}
}
然后在用于底部Sheet的布局中：
<?xml version="1.0" encoding="utf-8"?>
<com.your.package.DisallowInterceptView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
android:maxHeight="400dp"
android:minHeight="300dp"
android:orientation="vertical"
>
...
</LinearLayout>
</com.your.package.DisallowInterceptView>
正如R. Zagórski所述，我在这里描述了此滚动行为的原因（链接），即 BottomSheetBehavior 仅支持一个可滚动子项。然而，这个答案并没有重点关注底部工作表对话框。
因此-就像R. Zagórski一样-我扩展了自己的库来克服这个限制。 从0.0.3开始支持底部工作表对话框！您可以在此处找到库和示例应用程序： https://github.com/laenger/ViewPagerBottomSheet
要在项目中使用，请将maven存储库URL添加到build.gradle中：
repositories {
maven { url "https://raw.github.com/laenger/maven-releases/master/releases" }
}
将该库添加到依赖项中：
dependencies {
compile "biz.laenger.android:vpbs:0.0.3"
}
将ViewPagerBottomSheetDialogFragment用作对话框片段的超类。然后在内容视图中设置任何ViewPager：
public class DialogFragment extends ViewPagerBottomSheetDialogFragment {
@Override
public void setupDialog(Dialog dialog, int style) {
super.setupDialog(dialog, style);
final View contentView = View.inflate(getContext(), R.layout.dialog_bottom_sheet, null);
final ViewPager viewPager = (ViewPager) contentView.findViewById(R.id.viewpager);
// ...
BottomSheetUtils.setupViewPager(viewPager);
dialog.setContentView(contentView);
}
}
BottomSheetBehaviour仅适用于它找到的第一个可滚动子级。它还提出了不同的CoordinatorLayout.Behavior的使用方法，这些方法在此处被提出并发布。
然而，你的情况有点不同。使用了BottomSheetDialogFragment。这就是提供的解决方案不起作用的地方。但是，我设法克服了这个问题。发布了存储库，其中修改了你的项目以使其正常工作。它使用了前面提到的库中的ViewPagerBottomSheetBehavior。
基本上，进行了以下更改：
StatisticFragment extends ViewPagerBottomSheetDialogFragment and not BottomSheetDialogFragmentThe onCreateDialog function in StatisticsFragment is changed:
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
ViewPagerBottomSheetDialog dialog = (ViewPagerBottomSheetDialog) super.onCreateDialog(savedInstanceState);
View rootView = View.inflate(getContext(), R.layout.sheet_main, null);
viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
dialog.setContentView(rootView);
mBehavior = ViewPagerBottomSheetBehavior.from((View) rootView.getParent());
mBehavior.setPeekHeight(400);
if (viewPager != null && tabLayout != null) {
initViewPager();
}
return dialog;
}
The following function is invoked on the ViewPager:
BottomSheetUtils.setupViewPager(viewPager);
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new BottomSheetDialog(getContext(), getTheme());
}
BottomSheetDialog，但是它的行为被静态定义成了BottomSheetBehavior。需要做的是重写ViewPagerBottomSheetDialogFragment，返回ViewPagerBottomSheetDialog，并将其CoordinatorLayout.Behavior设置为ViewPagerBottomSheetBehavior。此外，自定义的BottomSheet也需要被重写以适应ViewPagerBottomSheetBehavior。我曾经遇到过同样的问题，为了解决这个问题而不需要覆盖BottomSheetBehavior或者需要额外的库，你可以按照以下步骤进行操作： 在你的底部面板实现中添加一个回调函数，用于注册页面的变化。
fun onPageChanged(currentPage: Int) {
recycler1.isNestedScrollingEnabled = currentPage == 0
recycler2.isNestedScrollingEnabled = currentPage == 1
dialog?.findViewById<FrameLayout>(R.id.design_bottom_sheet)?.requestLayout()
}
你可以在CoordinatorLayout中使用2个RecyclerView。
<android.support.design.widget.CoordinatorLayout
android:id="@+id/mainBottomSheet"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerViewRight"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerViewLeft"
android:layout_width="200dp"
android:layout_height="match_parent" />
</android.support.design.widget.CoordinatorLayout>
请查看此帖子链接
-keep class androidx.viewpager.widget.ViewPager$LayoutParams { int position; }
-keep class com.google.android.material.bottomsheet.BottomSheetBehavior { *** findScrollingChild(...); }
关于此事的更多细节可以在以下链接中找到：https://github.com/kafumi/android-bottomsheet-viewpager#proguardr8
你不需要将 StatisticFragment 扩展为 ViewPagerBottomSheetDialogFragment，也不需要使用任何库。
这是你的代码，我只是针对 View Pager 对你的 Static Fragment 进行了一些更改。
这是我所做的更改后的 Statistic Fragment。
所有上述答案中所述的错误都不存在。
只需用这段代码替换你旧的 Static fragment，不需要进行其他任何更改，它将给你所需的输出结果。
我只是在你的 View Pager 周围进行了一些更改，并使其按照你的要求工作。使用了 OnPageChangeListener 方法来获取该视图。
Statistic Fragment.java
public class StatisticFragment extends BottomSheetDialogFragment {
private BottomSheetBehavior mBehavior;
private TabLayout tabLayout;
private ViewPager viewPager;
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
View rootView = View.inflate(getContext(), R.layout.sheet_main, null);
viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
if (viewPager != null && tabLayout != null) {
initViewPager();
}
final ViewPager.OnPageChangeListener pageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
View view = viewPager.findViewWithTag(arg0);
if (view == null) {
return;
}
CustomPagerAdapter adapter = new CustomPagerAdapter(getContext());
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(10);
tabLayout.setupWithViewPager(viewPager);
}
@Override
public void onPageScrollStateChanged(int state) {
}
};
viewPager.addOnPageChangeListener(pageChangeListener);
viewPager.post(new Runnable() {
@Override
public void run() {
pageChangeListener.onPageSelected(viewPager.getCurrentItem());
}
});
dialog.setContentView(rootView);
mBehavior = BottomSheetBehavior.from((View) rootView.getParent());
return dialog;
}
private void initViewPager() {
CustomPagerAdapter adapter = new CustomPagerAdapter(getContext());
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(10);
tabLayout.setupWithViewPager(viewPager);
}
@Override
public void onStart() {
super.onStart();
//mBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
//mBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
}
public class ServiceVideHolder extends RecyclerView.ViewHolder {
protected ViewGroup mItemView;
protected TextView mNameView;
protected TextView mCodeView;
public ServiceVideHolder(View v) {
super(v);
//rootView = v;
mItemView = (ViewGroup) v.findViewById(R.id.item);
mNameView = (TextView) v.findViewById(R.id.main_text);
mCodeView = (TextView) v.findViewById(R.id.sub_text);
}
}
public class ItemViewHolder extends RecyclerView.ViewHolder {
protected TextView mMainText;
protected TextView mSubText;
public ItemViewHolder(View v) {
super(v);
mMainText = (TextView) v.findViewById(R.id.main_text);
mSubText = (TextView) v.findViewById(R.id.sub_text);
}
}
public class ItemAdapter extends RecyclerView.Adapter<ItemViewHolder> {
private List<Item> items;
public ItemAdapter(List<Item> items) {
this.items = items;
}
@Override
public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
return new ItemViewHolder(view);
}
@Override
public void onBindViewHolder(final ItemViewHolder viewHolder, final int position) {
final Item item = items.get(position);
viewHolder.mMainText.setText(item.name);
viewHolder.mSubText.setText(item.value);
viewHolder.mMainText.setTextColor(ResourcesCompat.getColor(getResources(), position % 2 == 0 ? R.color.md_red_500 : R.color.md_blue_500, null));
}
@Override
public int getItemCount() {
return items.size();
}
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
public class CustomPagerAdapter extends PagerAdapter {
private Context mContext;
public CustomPagerAdapter(Context context) {
mContext = context;
}
@Override
public Object instantiateItem(ViewGroup collection, int position) {
//CustomPagerEnum customPagerEnum = CustomPagerEnum.values()[position];
LayoutInflater inflater = LayoutInflater.from(mContext);
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.adapter, collection, false);
rootView.setTag(position);
Toast.makeText(mContext, "Inside Instanciate Item", Toast.LENGTH_SHORT).show();
//View rootView = View.inflate(getContext(), R.layout.adapter, null);
final RecyclerView mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
ArrayList<Item> items = new ArrayList<>();
if (position == 0) {
items.add(new Item("Coffee 1", "1"));
items.add(new Item("Coffee 2", "2"));
items.add(new Item("Coffee 3", "3"));
items.add(new Item("Coffee 4", "4"));
items.add(new Item("Coffee 5", "5"));
items.add(new Item("Coffee 6", "6"));
items.add(new Item("Coffee 7", "7"));
items.add(new Item("Coffee 8", "8"));
items.add(new Item("Coffee 9", "9"));
items.add(new Item("Coffee 10", "10"));
} else {
items.add(new Item("Milk 1", "1"));
items.add(new Item("Milk 2", "2"));
items.add(new Item("Milk 3", "3"));
items.add(new Item("Milk 4", "4"));
items.add(new Item("Milk 5", "5"));
items.add(new Item("Milk 6", "6"));
items.add(new Item("Milk 7", "7"));
items.add(new Item("Milk 8", "8"));
items.add(new Item("Milk 9", "9"));
items.add(new Item("Milk 10", "10"));
}
final ItemAdapter mAdapter = new ItemAdapter(items);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
mRecyclerView.setNestedScrollingEnabled(false);
mRecyclerView.setAdapter(mAdapter);
Paint paint = new Paint();
paint.setStrokeWidth(1);
paint.setColor(ResourcesCompat.getColor(getResources(), R.color.md_grey_500, null));
paint.setAntiAlias(true);
paint.setPathEffect(new DashPathEffect(new float[]{25.0f, 25.0f}, 0));
mRecyclerView.addItemDecoration(new HorizontalDividerItemDecoration.Builder(getActivity()).showLastDivider().paint(paint).build()); //.marginResId(R.dimen.leftmargin, R.dimen.rightmargin)
collection.addView(rootView);
return rootView;
}
@Override
public void destroyItem(ViewGroup collection, int position, Object view) {
collection.removeView((View) view);
}
@Override
public int getCount() {
return 2;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public CharSequence getPageTitle(int position) {
//CustomPagerEnum customPagerEnum = CustomPagerEnum.values()[position];
return position == 0 ? "Coffee" : "Milk";
}
}
}
完成了。
