0

有谁知道如何检索这些二维码上的数据并使用它们来更新我的 google firestore 数据库上的集合。这将非常有帮助。下面是我正在使用的代码，因为 ML 套件处于测试阶段等我找不到任何关于如何做到这一点的教程：

这是下面的代码：我正在寻找的是在我的数据库集合之一中使用所述二维码和更新字段的代码。如果有任何关于如何做到这一点的指示，那将是最受欢迎的。我听说过正在使用数组，但由于我对编程很陌生，所以我还没有讨论这个话题。

public class StudentAccount extends AppCompatActivity {


private static final int CHOOSE_IMAGE = 101;
public static final int CAMERA_REQUEST_CODE = 10;
public static final int PROFILE_PIC_REQUEST_CODE = 20;

private Button button, signout;

private FirebaseAuth mAuth;
TextView username;

ImageView imageView;
EditText editText;
Uri uriProfileImage;
ProgressBar progressBar;
String profileImageUrl;


ListView listView;

private List<String> userList = new ArrayList<>();


private final int BARCODE_RECO_REQ_CODE = 200;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_student_account);

    mAuth = FirebaseAuth.getInstance();
    signout = (Button) findViewById(R.id.SIGNOUT3);
    username = (TextView) findViewById(R.id.welcomeText2);

    //Check if user i already logged in or not

    if (mAuth.getCurrentUser() == null){
        finish();
        startActivity(new Intent(getApplicationContext(),SignInActivity.class));
    }

    //Fetching display name of current user and setting to activity
    FirebaseUser user = mAuth.getCurrentUser();
    if (user != null){
        username.setText("Welcome " +user.getEmail());
    }

    signout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mAuth.signOut();
            finish();
            startActivity(new Intent(getApplicationContext(), MainActivity.class));
        }
    });


    imageView = findViewById(R.id.imageView);
    progressBar = findViewById(R.id.progressbar);
    mAuth = FirebaseAuth.getInstance();

    button =  findViewById(R.id.VIEW_ATTENDANCE);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            openViewMyAttendance();
        }
    });



    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showImageChooser();

        }
    });

    findViewById(R.id.buttonSave).setOnClickListener( new View.OnClickListener(){

        @Override
        public void onClick(View view) {
            saveUserInformation();
        }

        private void saveUserInformation() {


            FirebaseUser user = mAuth.getCurrentUser();

            if (user != null && profileImageUrl != null){
                UserProfileChangeRequest profile = new UserProfileChangeRequest.Builder()
                        .setPhotoUri(Uri.parse(profileImageUrl)).build();

                user.updateProfile(profile).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                      if (task.isSuccessful()) {
                          Toast.makeText(StudentAccount.this, "Profile Updated", Toast.LENGTH_SHORT).show();
                      }
                    }
                });
            }
        }
    });

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CHOOSE_IMAGE && resultCode == RESULT_OK && data != null && data.getData() !=null){
        uriProfileImage = data.getData();

        try {
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uriProfileImage);
            imageView.setImageBitmap(bitmap);

            uploadImageToFirebaseStorage();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    if (requestCode == BARCODE_RECO_REQ_CODE){
        if (resultCode == RESULT_OK){
            Bitmap photo = (Bitmap)data.getExtras().get("data");
            barcodeRecognition(photo);
        }
    }
}

private void barcodeRecognition(Bitmap photo) {
    FirebaseVisionImage image = FirebaseVisionImage.fromBitmap(photo);
    FirebaseVisionBarcodeDetector detector = FirebaseVision.getInstance()
            .getVisionBarcodeDetector();
    Task<List<FirebaseVisionBarcode>> result = detector.detectInImage(image)
            .addOnSuccessListener(new OnSuccessListener<List<FirebaseVisionBarcode>>() {
                @Override
                public void onSuccess(List<FirebaseVisionBarcode> barcodes) {

                    for (FirebaseVisionBarcode barcode: barcodes) {
                        Rect bounds = barcode.getBoundingBox();
                        Point[] corners = barcode.getCornerPoints();

                        String rawValue = barcode.getRawValue();

                        int valueType = barcode.getValueType();
                        Toast.makeText(StudentAccount.this, rawValue, Toast.LENGTH_SHORT).show();

                    }
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                   Toast.makeText(StudentAccount.this, "Something went wrong", Toast.LENGTH_SHORT).show();
                }
            });
}


private void uploadImageToFirebaseStorage() {
    final StorageReference profileImageRef = FirebaseStorage.getInstance().getReference
            ("profilepics/"+System.currentTimeMillis() + ".jpg");

    if (uriProfileImage != null){
        progressBar.setVisibility(View.VISIBLE);
        profileImageRef.putFile(uriProfileImage).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                progressBar.setVisibility(View.GONE);

                profileImageUrl = taskSnapshot.getUploadSessionUri().toString();

            }
        })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        progressBar.setVisibility(View.GONE);
                        Toast.makeText(StudentAccount.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                    }
                });
    }

}

private void loadUserInformation() {
    if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
        updateProfilePermissions();
    } else {
        String[] permissionRequested = {Manifest.permission.READ_EXTERNAL_STORAGE};
        requestPermissions(permissionRequested, PROFILE_PIC_REQUEST_CODE);
    }
}

private void updateProfilePermissions() {
    FirebaseUser user = mAuth.getCurrentUser();
    if (user.getPhotoUrl() != null) {
        Glide.with(this).load(user.getPhotoUrl().toString()).into(imageView);
    }

}


private void showImageChooser(){
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent, "Select Profile Image"),CHOOSE_IMAGE);
}


@Override
protected void onPause(){
    super.onPause();
}


public void barcodeReco(View v) {
    if(checkSelfPermission(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED){
        callsCamera();
    } else {
        String[] permissionRequested = {Manifest.permission.CAMERA};
        requestPermissions(permissionRequested, CAMERA_REQUEST_CODE);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == CAMERA_REQUEST_CODE){
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
            callsCamera();
        } else {
            Toast.makeText(this, getString(R.string.unable_to_invoke_camera), Toast.LENGTH_LONG).show();
        }
    } else if (requestCode == PROFILE_PIC_REQUEST_CODE){
        if (grantResults [0] == PackageManager.PERMISSION_GRANTED){
            loadUserInformation();
        } else {
            Toast.makeText( this, getString(R.string.Unable_to_update_profile), Toast.LENGTH_LONG).show();
        }
    }
}

private void callsCamera() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    startActivityForResult(intent,BARCODE_RECO_REQ_CODE);
}

public void openViewMyAttendance () {
    Intent intent = new Intent(this, ViewMyAttendance.class);
    startActivity(intent);
}

}

这是我用来手动更新数据库中的字段的一段代码。我正在努力更改此代码以使用 qr 代码更新字段。

   public void saveAttendance(View v) {
    String sessionID = editTextSessionID.getText().toString();
    String studentID = editTextStudentID.getText().toString();

    Attendance attendance = new Attendance(sessionID, studentID);

    attendanceRef2.add(attendance).addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
        @Override
        public void onSuccess(DocumentReference documentReference) {
            Toast.makeText(InputManualAttendance.this, "Attendance Record Updated", Toast.LENGTH_SHORT).show();
        }
    });
}

我用 get 和 set 方法制作了一个单独的出勤类，并通过下面的代码引用了它们，这是我输入到 firestore 的地方：

   private FirebaseFirestore db = FirebaseFirestore.getInstance();
private CollectionReference attendanceRef2 = db.collection("Attendance");
4

0 回答 0