android - 如何从 RecyclerView 保存更改的数据并上传更改

Question

我正在处理一张图像 并从中获取“数据”。然后我在 RecyclerView 中显示它们。如有必要，我会更正 RecyclerView 中的一些数据。如何将更正后的数据与其他所有内容一起上传，因为即使 RecyclerView 中显示更正后也没有上传更改，而是上传了错误的数据。有人可以帮助我被困了几天......

这是我要将数据添加到 Recyclerview 的 mainActivity 的一部分？

TextExtractionActivity.class

if (fileDirectory.isDirectory()) {
    listCroppedImages.clear();
    EmptyViewCroppedImage.setVisibility(View.GONE);
    RVCroppedImages.setVisibility(View.VISIBLE);
    listCroppedImages.clear();
    String PhotoPath[] = new String[100];
    final String StudentMatric[] = new String[100];
    final String AttendanceRecord[] = new String[100];

    for (int i = 1; i <= fileDirectory.listFiles().length; i++) {
        PhotoPath[i] = croppedImageDirectory + i + ".jpg";

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap croppedimageold = BitmapFactory.decodeFile(PhotoPath[i], options);
        Bitmap croppedimagenew = Bitmap.createScaledBitmap(croppedimageold, 460, 66, true);

        StudentMatric[i] = TextImageProcess(croppedimagenew);
        AttendanceRecord[i] = CircleDetection(croppedimagenew, StudentMatric[i]);
        listCroppedImages.add(new CroppedImageModel(String.valueOf(i), PhotoPath[i], StudentMatric[i], AttendanceRecord[i]));

        btnUploadAttendance.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                for (int x = 1; x <= listCroppedImages.size(); x++) {
                    UploadData(StudentMatric[x], AttendanceRecord[x], x);
                }
            }
        });


    }
} else {
    EmptyViewCroppedImage.setVisibility(View.VISIBLE);
    RVCroppedImages.setVisibility(View.GONE);
}

-----------------------------------------------------------------------

public void UploadData(final String StudentMatric, final String AttendanceRecord, final int x) {
     ProgressUploadAttendance.setVisibility(View.VISIBLE);

    Query query = StudentsRef.orderByKey().equalTo(StudentMatric);
    query.addListenerForSingleValueEvent(new ValueEventListener() {
      @Override
      public void onDataChange(DataSnapshot dataSnapshot) {
          if (dataSnapshot.exists()) {
              int progress = x / listCroppedImages.size() * 100;
              DatabaseReference StudentMatricRef = StudentsRef.child(StudentMatric).child("Attendance").push();
              StudentMatricRef.child("Status").setValue(AttendanceRecord);
              StudentMatricRef.child("Date").setValue(getCurrentDate());
              ProgressUploadAttendance.setProgress(progress);
          } else {
              Toast.makeText(TextExtractionActivity.this, "Could not Find " + StudentMatric, Toast.LENGTH_LONG).show();
          }

      }

      @Override
      public void onCancelled(DatabaseError databaseError) {
          throw databaseError.toException(); // don't ignore errors
      }
  });

}

“RecyclerViewAdapterCroppedImages.class”

class RecyclerViewAdapterCroppedImages extends RecyclerView.Adapter<RecyclerViewAdapterCroppedImages.CroppedimageViewHolder> {

private Context mContext;
private List<CroppedImageModel> mData;
int x =0;

//   private String StudentMatric, studentMatric, AttendanceStatus, attendanceStatus;

public RecyclerViewAdapterCroppedImages() { }   //Constructor


public RecyclerViewAdapterCroppedImages(Context mContext, List<CroppedImageModel> mData) {
    this.mContext = mContext;
    this.mData = mData;
}


@Override
public CroppedimageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View croppedimageview;
    LayoutInflater mInflater = LayoutInflater.from(mContext);
    croppedimageview = mInflater.inflate(R.layout.item_cropped_image, parent, false);
    return new CroppedimageViewHolder(croppedimageview);
}

@Override
public void onBindViewHolder(final CroppedimageViewHolder holder, final int position) {

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inPreferredConfig = Bitmap.Config.ARGB_8888;
    Bitmap croppedimageold = BitmapFactory.decodeFile(mData.get(position).getCroppedImagePath(), options);
    Bitmap croppedimagenew = Bitmap.createScaledBitmap(croppedimageold, 528, 80, true);


    holder.StudentNo.setText(mData.get(position).getStudentNo());
    holder.CroppedImage.setImageBitmap(croppedimagenew);
    holder.StudentId.setText(mData.get(position).getStudentMatric());
    holder.StudentStatus.setText(mData.get(position).getAttendanceRecord());

    holder.StudentStatus.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mData.get(position).getAttendanceRecord().equals("Failed")) {
                holder.StudentStatus.setText("Present");
            } else if (mData.get(position).getAttendanceRecord().equals("Present")) {
                holder.StudentStatus.setText("Absent");
            } else if (mData.get(position).getAttendanceRecord().equals("Absent")) {
                holder.StudentStatus.setText("Present");
            }
        }
    });


}

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


class CroppedimageViewHolder extends RecyclerView.ViewHolder {
    TextView StudentNo, StudentId, StudentStatus;
    ImageView CroppedImage;

    private CroppedimageViewHolder(View itemView) {
        super(itemView);
        StudentNo = itemView.findViewById(R.id.tvtxtprocessstudentno);
        CroppedImage = itemView.findViewById(R.id.ivcroppedimage);
        StudentId = itemView.findViewById(R.id.tvtxtprocessstudentid);
        StudentStatus = itemView.findViewById(R.id.tvtxtprocessstudentstatus);
    }
}

}  

Answer 1

我找到了解决方案。问题是我认为我必须通过位于我的主要 Activity 中的适配器通知 notifiyOnDatachange。但我不必..

在我的 RecyclerViewAdapterCroppedImage.class 中

final CroppedImageModel changedRecord = mData.get(position);
holder.IVattendance.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            switch (mData.get(position).getAttendanceRecord())
            {
                case "Failed":
                    mData.get(position).setAttendanceRecord("Present");
                    correctionAttendance(position, changedRecord);//code
                    break;

                case "Present":
                    mData.get(position).setAttendanceRecord("Absent");
                    correctionAttendance(position, changedRecord);
                    break;

                case "Absent":
                    mData.get(position).setAttendanceRecord("Present");
                    correctionAttendance(position, changedRecord);
                    break;

                default:
                    break;
            }
        }
    });

    public void correctionAttendance(int position, CroppedImageModel attendanceRecord ) {
    mData.set(position, attendanceRecord);
    notifyItemChanged(position);
    notifyDataSetChanged();
    }

在我的 TextExtractionActivity.class 中，我直接从 Adapter 获取数据，而不是在我处理数据并将数据发送到 Adapter 的地方。

btnUploadAttendance.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                for (int x = 0; x < listCroppedImages.size(); x++) {
                    UploadData(listCroppedImages.get(x).getStudentMatric(),listCroppedImages.get(x).getAttendanceRecord(),x);
                }
            }
        });

最后我的 UploadData() 与问题中所述保持相同..感谢任何打算回答或提供格式更正的人..