recyclerview行IGNORE重复

Question

我有一个应用程序，我捕获图像并将其与DATE的名称保存到firebase实时数据库。

我从我的MainActivity中检索我的图像名称（日期）到另一个活动的Recyclerview。

当我在MainActivity中调用相机时，它会在捕获时自动上传文件。这是上传图片的代码：

 private void uploadFile() {
    final String bothStamp = new SimpleDateFormat("yyyy.MM.dd HH mm ss").format(new Date());
    final String dateStamp = new SimpleDateFormat("yyyy.MM.dd").format(new Date());
    final String timeStamp = new SimpleDateFormat("HH mm ss").format(new Date());

    if (mImageUri != null) {
        StorageReference fileReference = mStorageRef.child(bothStamp
                + "." + getFileExtension(mImageUri));

        mUploadTask = fileReference.putFile(mImageUri)
                .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        Handler handler = new Handler();
                        handler.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                mProgressBar.setProgress(0);
                            }
                        }, 500);

                        Toast.makeText(MainActivity.this, "Upload successful", Toast.LENGTH_LONG).show();
                        Upload upload = new Upload(
                                taskSnapshot.getDownloadUrl().toString(), dateStamp, timeStamp );

                        String uploadId = mDatabaseRef.push().getKey();
                        mDatabaseRef.child(uploadId).setValue(upload);

然后我有我的UPLOAD课程：

public class Upload {

private String mTime;
private String mName;
private String mImageUrl;


public Upload() {
    //empty constructor 
}

public Upload(String imageUrl, String name, String time) {

    mImageUrl = imageUrl;
    mName = name;
    mTime = time;

}


public String getName() {
    return mName;
}

public void setName(String name) {
    mName = name;
}

public String getImageUrl() {
    return mImageUrl;
}




public void setImageUrl(String imageUrl) {
    mImageUrl = imageUrl;
}
}

然后我有了适用于recyclerview的ADAPTER：

public class DateListAdapter extends RecyclerView.Adapter<DateListAdapter.ImageViewHolder> {
private Context mContext;
private List<Upload> mUploads;



public DateListAdapter(Context context, List<Upload> uploads) {

    mContext = context;
    mUploads = uploads;
}


@Override
public DateListAdapter.ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(mContext).inflate(R.layout.date_list, parent, false);
    return new DateListAdapter.ImageViewHolder(v);
}


@Override
public void onBindViewHolder(ImageViewHolder holder, int position) {
    Upload uploadCurrent = mUploads.get(position);
    String dateName = uploadCurrent.getName();

        holder.textViewName.setText(dateName);
    }



@Override
public int getItemCount() {
    return mUploads.size();
}

public class ImageViewHolder extends RecyclerView.ViewHolder {
    public TextView textViewName;

    public ImageViewHolder(View itemView) {
        super(itemView);
        textViewName = (TextView) itemView.findViewById(R.id.text_view_name_date);

    }
}
}

现在，当我在一天内捕获多个图像时，这是我的输出：

This is what my code output is right now in the user interface

这就是我想在OUTPUT中拥有的内容：

This is what I would like to show in my RECYCLERVIEW

所以我的目的是创建一个CLEAN和简单的USER界面。我不希望显示多个日期，我只想要一个日期，然后当用户点击日期时，它应该显示在该日期捕获的所有图像。

---

这是我的RecyclerView活动中的EventListener：

mDatabaseRef.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                Upload upload = postSnapshot.getValue(Upload.class);

                mUploads.add(upload);
            }


            mAdapter = new DateListAdapter(CapturedImageDateListActivity.this, mUploads);
            mRecyclerView.setAdapter(mAdapter);

        }

Answer 1

由于日期相同，您的数据在存储时会被覆盖。您所要做的就是根据当前日期存储数据。现在您可以根据不同的日期轻松获取数据。

并看看我的Firebase Helper Class

   final String dateStamp = new SimpleDateFormat("yyyy.MM.dd").format(new Date());

ImageModel imageValue=new ImageModel(datestamp,imageUrl);

mdatabaseReference.child("imageGalleryNode").child(dateStamp).child(getRandomId()).setValue(imageValue)

如果你想维护每个用户数据。

mdatabaseReference.child("imageGalleryNode").child(dateStamp).child(mAuth.getCurrentUser().getUid()).child(getRandomId()).setValue(imageValue)



public String getRandomId() {

        String id = UUID.randomUUID().toString();
        return id;
    }

并使用firebase事件监听器获取数据。

ArrayList<String> dateNodeKeyList=new Arraylist<>();

 databaseReference = FireBaseHelper.getDataBaseRefrence();
        databaseReference.child("imageGalleryNode");



  databaseReference .addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {

if(dateNodeKeyList.size>0){ //to avoid data duplication on data change.
dateNodeKeyList.clear();
}

                  ArrayList<ImagesModel> arrayList = new ArrayList<>();

        for (DataSnapshot childSnapshot : dataSnapshot.getChildren()) {

            // key for node .!
             String key = childSnapshot.getKey();
             dateNodeKeyList.add(key);

           // ImagesModel object =  
              childSnapshot.getValue(ImagesModel.class);

            arrayList.add(object);

        }

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {



                }
            });

而你的json就是这样的。

{

  "26-02-2018": {
    "13d49659-8ab1-48b7-808b-987f43de9fbc": {
      "DHFNJoa2hPdtM1sapeIFPQpDH7c2": {
        "imageName": "13d49659-8ab1-48b7-808b-987f43de9fbc",
        "imageUrl": 0,
        "imageid": "fa7d6135-64ba-4bbe-8b9e-078bc6171463",
        "userId": "DHFNJoa2hPdtM1sapeIFPQpDH7c2"
      }
    },
    "51c51cec-ac6d-4766-823e-df9e27cfc169": {
      "DHFNJoa2hPdtM1sapeIFPQpDH7c2": {
        "imageName": "51c51cec-ac6d-4766-823e-df9e27cfc169",
        "imageUrl": 0,
        "imageid": "f16185f4-05b6-4d77-8019-c09563e044ce",
        "userId": "DHFNJoa2hPdtM1sapeIFPQpDH7c2"
      }
    }
  },
  "27-02-2018": {
    "13d49659-8ab1-48b7-808b-987f43de9fbc": {
      "DHFNJoa2hPdtM1sapeIFPQpDH7c2": {
        "imageName": "13d49659-8ab1-48b7-808b-987f43de9fbc",
        "imageUrl": 0,
        "imageid": "fa7d6135-64ba-4bbe-8b9e-078bc6171463",
        "userId": "DHFNJoa2hPdtM1sapeIFPQpDH7c2"
      }
    },
    "51c51cec-ac6d-4766-823e-df9e27cfc169": {
      "DHFNJoa2hPdtM1sapeIFPQpDH7c2": {
        "imageName": "51c51cec-ac6d-4766-823e-df9e27cfc169",
        "imageUrl": 0,
        "imageid": "f16185f4-05b6-4d77-8019-c09563e044ce",
        "userId": "DHFNJoa2hPdtM1sapeIFPQpDH7c2"
      }
    }
  },
  "28-02-2018": {
    "13d49659-8ab1-48b7-808b-987f43de9fbc": {
      "DHFNJoa2hPdtM1sapeIFPQpDH7c2": {
        "imageName": "13d49659-8ab1-48b7-808b-987f43de9fbc",
        "imageUrl": 0,
        "imageid": "fa7d6135-64ba-4bbe-8b9e-078bc6171463",
        "userId": "DHFNJoa2hPdtM1sapeIFPQpDH7c2"
      }
    },
    "51c51cec-ac6d-4766-823e-df9e27cfc169": {
      "DHFNJoa2hPdtM1sapeIFPQpDH7c2": {
        "imageName": "51c51cec-ac6d-4766-823e-df9e27cfc169",
        "imageUrl": 0,
        "imageid": "f16185f4-05b6-4d77-8019-c09563e044ce",
        "userId": "DHFNJoa2hPdtM1sapeIFPQpDH7c2"
      }
    }
  }

}