为什么进度对话框不显示？

Question

My coding works where the data is saved in the real-time database. However, the progress dialogue does not work. How to put a coding to show if the data failed to be saved in the real-time database?

private void SaveAccountInformation() {

    loadingBar.setTitle("Registration Account");
    loadingBar.setMessage("Please wait while we are registering you in our system.");
    loadingBar.show();
    loadingBar.setCanceledOnTouchOutside(true);

    String firstname = RegisterFirstName.getText().toString();
    String lastname = RegisterLastName.getText().toString();

    if (TextUtils.isEmpty(firstname))
        Toast.makeText(RegistrationActivity.this, "Enter your first name.", Toast.LENGTH_SHORT).show();

    else if (TextUtils.isEmpty(lastname))
        Toast.makeText(RegistrationActivity.this, "Last name is required.", Toast.LENGTH_SHORT).show();

    else {
        String userid = databaseUser.push().getKey();
        User user = new User(firstname, lastname);
        databaseUser.child(userid).setValue(user);
        Toast.makeText(RegistrationActivity.this, "Registration has been successful.", Toast.LENGTH_SHORT).show();

        Intent HomeIntent = new Intent(RegistrationActivity.this, home.class);
        HomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(HomeIntent);
        finish();
    }

    loadingBar.dismiss();
}

Answer 1

As far as I have understood about your problem you want to track if the data is saved properly or not and show a progress dialog in the meantime. I suppose you are using Firebase database and saving the values under a specific node.

You might consider having a callback function here I suppose while saving the data in your Firebase real-time database.

I am rewriting the code. Please note that the code is not tested and modify if you get any syntax errors.

private void SaveAccountInformation() {

    ProgressDialog loadingBar = new ProgressDialog(RegistrationActivity.this);
    loadingBar.setMessage("Please wait while we are registering you in our system.");
    loadingBar.show();
    loadingBar.setCanceledOnTouchOutside(true);

    String firstname = RegisterFirstName.getText().toString();
    String lastname = RegisterLastName.getText().toString();

    if (TextUtils.isEmpty(firstname))
        Toast.makeText(RegistrationActivity.this, "Enter your first name.", Toast.LENGTH_SHORT).show();

    else if (TextUtils.isEmpty(lastname))
        Toast.makeText(RegistrationActivity.this, "Last name is required.", Toast.LENGTH_SHORT).show();

    else {

        String userid = databaseUser.push().getKey();
        User user = new User(firstname, lastname);

        databaseUser.child(userid).setValue(user)
            .addOnSuccessListener(new OnSuccessListener<Void>() {
                @Override
                public void onSuccess(Void aVoid) {
                    Toast.makeText(RegistrationActivity.this, "Data saved successfully!", Toast.LENGTH_SHORT).show();
                    loadingBar.dismiss();
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Toast.makeText(RegistrationActivity.this, "Failed to save the data", Toast.LENGTH_SHORT).show();
                    loadingBar.dismiss();
                }
            }); 

        Intent HomeIntent = new Intent(RegistrationActivity.this, home.class);
        HomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(HomeIntent);
        finish();
    }
}

Hope that helps.

Answer 2

 private ProgressDialog  progressDialog = new ProgressDialog(Login.this);

 progressDialog.show();
 progressDialog.setMessage(getResources().getString(R.string.loading));
 progressDialog.setCancelable(false);

 progressDialog.dismiss();//close progressDialog