分页不适用于交错网格布局android
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【中文标题】分页不适用于交错网格布局android【英文标题】：Pagination not working with staggered grid layout android 【发布时间】：2021-09-22 07:45:56 【问题描述】：您好，我试图在我的 recylerview 中包含分页，但不知道为什么它不能使用 staggeredgrid layout this the question im searching for 并且因为答案是针对 linearlayoutmanager 我得到了一个关于如何在 staggerdgrid layoutmanager here is the answer i tried in my code 中实现分页的答案，图像没有加载
ScreenShot // 我现在得到的 ss
短代码
int pastVisiblesItems, visibleItemCount, totalItemCount;
int visibleThreshold = 1;
ContentLoadingProgressBar contentLoadingProgressBar;
private boolean isLoading = false;
contentLoadingProgressBar = view.findViewById(R.id.contentLoadingProgressBar);
final StaggeredGridLayoutManager linearLayoutManager = (StaggeredGridLayoutManager) postRecyclerView.getLayoutManager();
postRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener()
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy)
super.onScrolled(recyclerView, dx, dy);
int[] lastVisibleItemPositions = Objects.requireNonNull(linearLayoutManager).findLastVisibleItemPositions(null);
int lastVisibleItem = getLastVisibleItem(lastVisibleItemPositions);
int totalItemCount = linearLayoutManager.getItemCount();
if (!isLoading && totalItemCount <= (lastVisibleItem + visibleThreshold))
getData();
shimmerFrameLayout.startShimmer();
isLoading = true;
);
public int getLastVisibleItem(int[] lastVisibleItemPositions)
int maxSize = 0;
for (int i = 0; i < lastVisibleItemPositions.length; i++)
if (i == 0)
maxSize = lastVisibleItemPositions[i];
else if (lastVisibleItemPositions[i] > maxSize)
maxSize = lastVisibleItemPositions[i];
return maxSize;
完整代码
public class Profile_Fragment extends Fragment implements PostAdapter.OnItemClickListener
public static List<Upload> mUploads;
private final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("uploads");
PostAdapter postsAdapter;
ShimmerFrameLayout shimmerFrameLayout;
RecyclerView postRecyclerView;
Button editProfileButton;
CircleImageView profilePhoto;
ContentLoadingProgressBar contentLoadingProgressBar;
int visibleThreshold = 1;
private FirebaseStorage mStorage;
private ValueEventListener databaseEventListener;
private boolean isLoading = false;
@SuppressLint("SourceLockedOrientationActivity")
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
View view = inflater.inflate(R.layout.fragment_profile, container, false);
requireActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
ImageView accountSettings = view.findViewById(R.id.account_Settings);
RelativeLayout relativeLayout = view.findViewById(R.id.snipet_profile);
profilePhoto = relativeLayout.findViewById(R.id.circleImageView);
editProfileButton = relativeLayout.findViewById(R.id.edit_profile_button);
contentLoadingProgressBar = view.findViewById(R.id.contentLoadingProgressBar);
editProfileButton.setOnClickListener(v ->
Fragment edit_profile = new Edit_Profile();
assert getFragmentManager() != null;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, edit_profile);
transaction.addToBackStack(null);
transaction.commit();
);
accountSettings.setOnClickListener(
v ->
BottomSheet bottomSheet = new BottomSheet();
bottomSheet.show(requireActivity().getSupportFragmentManager(), bottomSheet.getTag());
);
postRecyclerView = view.findViewById(R.id.postRecyclerViewProfile);
shimmerFrameLayout = view.findViewById(R.id.shimmerEffect);
postRecyclerView.setLayoutManager(
new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL)
);
final StaggeredGridLayoutManager linearLayoutManager = (StaggeredGridLayoutManager) postRecyclerView.getLayoutManager();
postRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener()
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy)
super.onScrolled(recyclerView, dx, dy);
assert linearLayoutManager != null;
int[] lastVisibleItemPositions = linearLayoutManager.findLastVisibleItemPositions(null);
int lastVisibleItem = getLastVisibleItem(lastVisibleItemPositions);
int totalItemCount = linearLayoutManager.getItemCount();
if (!isLoading && totalItemCount <= (lastVisibleItem + visibleThreshold))
isLoading = true;
getData();
);
mUploads = new ArrayList<>();
postsAdapter = new PostAdapter(getContext(), mUploads);
postRecyclerView.setAdapter(postsAdapter);
postsAdapter.setOnItemClickListener(Profile_Fragment.this);
return view;
public int getLastVisibleItem(int[] lastVisibleItemPositions)
int maxSize = 0;
for (int i = 0; i < lastVisibleItemPositions.length; i++)
if (i == 0)
maxSize = lastVisibleItemPositions[i];
else if (lastVisibleItemPositions[i] > maxSize)
maxSize = lastVisibleItemPositions[i];
return maxSize;
private void getData()
contentLoadingProgressBar.setVisibility(View.VISIBLE);
mStorage = FirebaseStorage.getInstance();
databaseEventListener = databaseReference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot snapshot)
if (snapshot.exists())
postRecyclerView.setVisibility(View.VISIBLE);
shimmerFrameLayout.stopShimmer();
shimmerFrameLayout.setVisibility(View.GONE);
contentLoadingProgressBar.setVisibility(View.GONE);
mUploads.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren())
Upload upload = dataSnapshot.getValue(Upload.class);
Objects.requireNonNull(upload).setmKey(dataSnapshot.getKey());
mUploads.add(upload);
//notify the adapter
postsAdapter.notifyDataSetChanged();
@Override
public void onCancelled(@NonNull DatabaseError error)
);
@Override
public void onClick(View view)
@Override
public void onItemClick(int position)
@Override
public void onDeleteClick(int position)
Upload selectedItem = mUploads.get(position);
String selectedKey = selectedItem.getmKey();
StorageReference imageRef = mStorage.getReferenceFromUrl(selectedItem.getmImageUrl());
imageRef.delete().addOnSuccessListener(aVoid ->
databaseReference.child(selectedKey).removeValue();
Toast.makeText(getContext(), "Post Deleted", Toast.LENGTH_SHORT).show();
)
.addOnFailureListener(aVoid -> Toast.makeText(getContext(), "Failed", Toast.LENGTH_SHORT).show());
@Override
public void onDestroyView()
super.onDestroyView();
databaseReference.removeEventListener(databaseEventListener);
更新 1
添加了adapter.class
public class PostAdapter extends RecyclerView.Adapter<PostAdapter.PostViewHolder>
public static List<Upload> mUploads;
public Context mcontext;
private OnItemClickListener mListener;
// ShimmerFrameLayout shimmerFrameLayout;
public PostAdapter(Context context, List<Upload> uploads)
mUploads = uploads;
mcontext = context;
@NonNull
@Override
public PostViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
View view;
LayoutInflater.from(mcontext).inflate(R.layout.post_item_container_profile, parent, false);
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_item_container_profile, parent, false);
return new PostViewHolder(view);
@Override
public void onBindViewHolder(@NonNull PostViewHolder holder, int position)
Upload uploadCurrent = mUploads.get(position);
Shimmer shimmer = new Shimmer.ColorHighlightBuilder()
.setBaseColor(Color.parseColor("#F3F3F3"))
.setBaseAlpha(1)
.setHighlightColor(Color.parseColor("#E7E7E7"))
.setHighlightAlpha(1)
.setDropoff(50)
.build();
ShimmerDrawable shimmerDrawable = new ShimmerDrawable();
shimmerDrawable.setShimmer(shimmer);
Glide.with(mcontext)
.load(uploadCurrent.getmImageUrl())
.diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
.placeholder(shimmerDrawable)
.centerCrop()
.fitCenter()
.into(holder.imageView);
@Override
public int getItemCount()
return mUploads.size();
public void setOnItemClickListener(OnItemClickListener listener)
mListener = listener;
public interface OnItemClickListener
void onClick(View view);
void onItemClick(int position);
void onDeleteClick(int position);
public class PostViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,
View.OnCreateContextMenuListener, MenuItem.OnMenuItemClickListener
ShapeableImageView imageView;
PostViewHolder(@NonNull View itemView)
super(itemView);
imageView = itemView.findViewById(R.id.imagePost);
itemView.setOnClickListener(this);
itemView.setOnCreateContextMenuListener(this);
@Override
public void onClick(View v)
if (mListener != null)
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION)
mListener.onItemClick(position);
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
MenuItem delete = menu.add(Menu.NONE, 2, 2, "Delete");
delete.setOnMenuItemClickListener(this);
@Override
public boolean onMenuItemClick(MenuItem item)
if (mListener != null)
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION)
if (item.getItemId() == 2)
mListener.onDeleteClick(position);
return true;
return false;
【问题讨论】：
您是否尝试过使用 Jetpack 中的Paging？
不，我尝试过，因为我认为 jetpack 可能只能与 kotlin 一起使用
【参考方案1】：
试试这个。
public class Profile_Fragment extends Fragment implements PostAdapter.OnItemClickListener
public static List<Upload> mUploads = new ArrayList<>();
private final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("uploads");
PostAdapter postsAdapter = new PostAdapter(getContext(), mUploads);;
ShimmerFrameLayout shimmerFrameLayout;
RecyclerView postRecyclerView;
Button editProfileButton;
CircleImageView profilePhoto;
ContentLoadingProgressBar contentLoadingProgressBar;
int visibleThreshold = 1;
private FirebaseStorage mStorage;
private ValueEventListener databaseEventListener;
private boolean isLoading = false;
@SuppressLint("SourceLockedOrientationActivity")
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
View view = inflater.inflate(R.layout.fragment_profile, container, false);
requireActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
ImageView accountSettings = view.findViewById(R.id.account_Settings);
RelativeLayout relativeLayout = view.findViewById(R.id.snipet_profile);
profilePhoto = relativeLayout.findViewById(R.id.circleImageView);
editProfileButton = relativeLayout.findViewById(R.id.edit_profile_button);
contentLoadingProgressBar = view.findViewById(R.id.contentLoadingProgressBar);
editProfileButton.setOnClickListener(v ->
Fragment edit_profile = new Edit_Profile();
assert getFragmentManager() != null;
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, edit_profile);
transaction.addToBackStack(null);
transaction.commit();
);
accountSettings.setOnClickListener(
v ->
BottomSheet bottomSheet = new BottomSheet();
bottomSheet.show(requireActivity().getSupportFragmentManager(), bottomSheet.getTag());
);
postRecyclerView = view.findViewById(R.id.postRecyclerViewProfile);
shimmerFrameLayout = view.findViewById(R.id.shimmerEffect);
postRecyclerView.setLayoutManager(
new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL)
);
final StaggeredGridLayoutManager linearLayoutManager = (StaggeredGridLayoutManager) postRecyclerView.getLayoutManager();
postRecyclerView.setAdapter(postsAdapter);
postRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener()
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy)
super.onScrolled(recyclerView, dx, dy);
assert linearLayoutManager != null;
int[] lastVisibleItemPositions = linearLayoutManager.findLastVisibleItemPositions(null);
int lastVisibleItem = getLastVisibleItem(lastVisibleItemPositions);
int totalItemCount = linearLayoutManager.getItemCount();
if (!isLoading && totalItemCount <= (lastVisibleItem + visibleThreshold))
isLoading = true;
getData();
postadapter.mUploads=mUploads
postsAdapter.notifyDataSetChanged();
);
postsAdapter.setOnItemClickListener(Profile_Fragment.this);
return view;
public int getLastVisibleItem(int[] lastVisibleItemPositions)
int maxSize = 0;
for (int i = 0; i < lastVisibleItemPositions.length; i++)
if (i == 0)
maxSize = lastVisibleItemPositions[i];
else if (lastVisibleItemPositions[i] > maxSize)
maxSize = lastVisibleItemPositions[i];
return maxSize;
private void getData()
contentLoadingProgressBar.setVisibility(View.VISIBLE);
mStorage = FirebaseStorage.getInstance();
databaseEventListener = databaseReference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot snapshot)
if (snapshot.exists())
postRecyclerView.setVisibility(View.VISIBLE);
shimmerFrameLayout.stopShimmer();
shimmerFrameLayout.setVisibility(View.GONE);
contentLoadingProgressBar.setVisibility(View.GONE);
mUploads.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren())
Upload upload = dataSnapshot.getValue(Upload.class);
Objects.requireNonNull(upload).setmKey(dataSnapshot.getKey());
mUploads.add(upload);
@Override
public void onCancelled(@NonNull DatabaseError error)
);
@Override
public void onClick(View view)
@Override
public void onItemClick(int position)
@Override
public void onDeleteClick(int position)
Upload selectedItem = mUploads.get(position);
String selectedKey = selectedItem.getmKey();
StorageReference imageRef = mStorage.getReferenceFromUrl(selectedItem.getmImageUrl());
imageRef.delete().addOnSuccessListener(aVoid ->
databaseReference.child(selectedKey).removeValue();
Toast.makeText(getContext(), "Post Deleted", Toast.LENGTH_SHORT).show();
)
.addOnFailureListener(aVoid -> Toast.makeText(getContext(), "Failed", Toast.LENGTH_SHORT).show());
@Override
public void onDestroyView()
super.onDestroyView();
databaseReference.removeEventListener(databaseEventListener);
如果不工作请告诉我.....
【讨论】：
你能发布你的adatper类代码文件吗，比如adapter.java 好的，我已经添加了适配器类，请立即查看 我是否应该在您添加更改后更新我的问题，以便您查看我所做的更改以上是关于分页不适用于交错网格布局android的主要内容，如果未能解决你的问题，请参考以下文章