如何实现向此应用上传？

Question

我正在编写一个应用程序，用于从图库和相机中上传图像 现在我的问题是我对Java和android以及编码一般来说是非常新的 我做了一个基本的应用程序（从github和SO的帮助下）从图库和/或相机中选择图像，现在我不知道如何实现向此应用程序中上传， ps我知道堆栈溢出不是一堆代码猴子来为我编写代码，但是如果您可以向我展示正确的方向，那么这已经困扰了好几天

我尝试整合来自此https://trinitytuts.com/capture-image-upload-server-android/和http://www.codeplayon.com/2018/11/android-image-upload-to-server-from-camera-and-gallery/的上传内容以及一些类似的SO问题 我曾经在SO上问过类似代码的问题，但是由于对某些事情感到沮丧，我对整个应用程序进行了重新编码

主要活动

    public class MainActivity extends Activity {

    private int REQUEST_CAMERA = 0, SELECT_FILE = 1;
    private Button btnSelect;
    private ImageView ivImage;
    private String userChoosenTask;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnSelect = (Button) findViewById(R.id.btnSelectPhoto);
        btnSelect.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                selectImage();
            }
        });
        ivImage = (ImageView) findViewById(R.id.ivImage);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case Utility.MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    if(userChoosenTask.equals("Take Photo"))
                        cameraIntent();
                    else if(userChoosenTask.equals("Choose from Library"))
                        galleryIntent();
                } else {
                    //code for deny
                }
                break;
        }
    }

    private void selectImage() {
        final CharSequence[] items = { "Take Photo", "Choose from Library",
                "Cancel" };

        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("Add Photo!");
        builder.setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int item) {
                boolean result=Utility.checkPermission(MainActivity.this);

                if (items[item].equals("Take Photo")) {
                    userChoosenTask ="Take Photo";
                    if(result)
                        cameraIntent();

                } else if (items[item].equals("Choose from Library")) {
                    userChoosenTask ="Choose from Library";
                    if(result)
                        galleryIntent();

                } else if (items[item].equals("Cancel")) {
                    dialog.dismiss();
                }
            }
        });
        builder.show();
    }

    private void galleryIntent()
    {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);//
        startActivityForResult(Intent.createChooser(intent, "Select File"),SELECT_FILE);
    }

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

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

        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == SELECT_FILE)
                onSelectFromGalleryResult(data);
            else if (requestCode == REQUEST_CAMERA)
                onCaptureImageResult(data);
        }
    }

    private void onCaptureImageResult(Intent data) {
        Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);

        File destination = new File(Environment.getExternalStorageDirectory(),
                System.currentTimeMillis() + ".jpg");

        FileOutputStream fo;
        try {
            destination.createNewFile();
            fo = new FileOutputStream(destination);
            fo.write(bytes.toByteArray());
            fo.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        ivImage.setImageBitmap(thumbnail);
    }

    @SuppressWarnings("deprecation")
    private void onSelectFromGalleryResult(Intent data) {

        Bitmap bm=null;
        if (data != null) {
            try {
                bm = MediaStore.Images.Media.getBitmap(getApplicationContext().getContentResolver(), data.getData());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        ivImage.setImageBitmap(bm);
    }

}