java我在Recyclerview中显示firebase的图像时遇到问题
我想在Recyclerview中显示我从firebase存储上传的图像
这是我的图片展示通知。java类
private RecyclerView mRecyclerView;
private ImageAdapter mAdapter;
private ProgressBar mProgressCircle;
private DatabaseReference mDatabaseRef;
private List<Uplaodfiles> mUploads;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_showing_notices);
mRecyclerView = findViewById(R.id.recyclerviewitems);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mProgressCircle = findViewById(R.id.progress_circle);
mUploads = new ArrayList<>();
mDatabaseRef = FirebaseDatabase.getInstance().getReference("Uploads");
mDatabaseRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
Uplaodfiles upload = postSnapshot.getValue(Uplaodfiles.class);
mUploads.add(upload);
}
mAdapter = new ImageAdapter(ImageShowingNotices.this, mUploads);
mRecyclerView.setAdapter(mAdapter);
mProgressCircle.setVisibility(View.INVISIBLE);
}
@Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(ImageShowingNotices.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
mProgressCircle.setVisibility(View.INVISIBLE);
}
});
}
@Override
protected void onStart() {
super.onStart();
}
这是我上传的文件。java类
public Uplaodfiles() {
//empty constructor needed
}
public Uplaodfiles(String name, String imageUrl) {
if (name.trim().equals("")) {
name = "No Name";
}
mName = name;
mImageUrl = imageUrl;
}
public String getName() {
return mName;
}
public void setName(String name) {
mName = name;
}
public String getImageUrl() {
return mImageUrl;
}
public void setImageUrl(String imageUrl) {
mImageUrl = imageUrl;
}
这是我的相机。java类
@Override
public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.image_items, parent, false);
return new ImageViewHolder(v);
}
@Override
public void onBindViewHolder(ImageViewHolder holder, int position) {
Uplaodfiles uploadCurrent = mUploads.get(position);
holder.textViewName.setText(uploadCurrent.getName());
Glide.with(mContext)
.load(uploadCurrent.getImageUrl())
.into(holder.imageView);
}
@Override
public int getItemCount() {
return mUploads.size();
}
public class ImageViewHolder extends RecyclerView.ViewHolder {
public TextView textViewName;
public ImageView imageView;
public ImageViewHolder(View itemView) {
super(itemView);
textViewName = itemView.findViewById(R.id.text_view_name);
imageView = itemView.findViewById(R.id.image_view_upload);
}
}
Logcat显示“未连接适配器;跳过布局”。 关于这个问题,我在StackOverflow上尝试过其他解决方案,但都不管用。请帮我摆脱这种局面
提前谢谢你
# 1 楼答案
我认为回调中的onDataChanged方法调用不正确
检查实时数据库节点结构,并检查firebase实时数据库警告的logcatwarn级别
可能访问规则或任何其他问题都会导致IO失败
此外,在数据更改时重新创建适配器也不是一个好的解决方案
在生命周期的第一个阶段,将适配器设置为RecyclerView一次
您只需更改Adapter的数据,然后使用Adapter调用notifyDatasetChanged
首先用虚拟数据测试你的RecyclerView