android - 如何使用volley从android上传用户指定数量的图像或文档？

Question

我的应用程序获取图像(强制)和一些文本，并将图像上传到服务器，并将图像位置和文本保存在 mysql 数据库中。我希望用户可以根据需要上传多个图像/文档(pdf、doc)要求诸如添加按钮之类的东西来增加上传字段。如何在数据库中为每个上传的文件存储多条记录(我需要为每次上传创建多个字段)？如何使用添加按钮为新文档创建上传字段并为每个上传请求实现java(用户可以不上传文件)？以及如何在 php 中处理此请求？

我上传单张图片的工作

public class NewsUpload extends Activity implements View.OnClickListener{

Button chooseImage;
Button uploadImage;
EditText titleView;
EditText paragraphView;
ImageView imageView;
Bitmap bitmap;

public static final String UPLOAD_URL = "myurl.com/upload.php";
public static final String KEY_IMAGE ="image";
public static  final String KEY_TITLE ="title";
public static  final String KEY_PARAGRAPH ="paragraph";
private int PICK_IMAGE_REQUEST = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.upload_news);
    Intent intent = getIntent();
    String name = intent.getStringExtra("username");
    Toast.makeText(this,name,Toast.LENGTH_SHORT).show();
    chooseImage = (Button)findViewById(R.id.buttonChoose);
    uploadImage = (Button) findViewById(R.id.buttonUpload);
    chooseImage.setOnClickListener(this);
    uploadImage.setOnClickListener(this);
    titleView = (EditText) findViewById(R.id.titleUpload);
    paragraphView = (EditText) findViewById(R.id.paragraphUpload);
    imageView = (ImageView)findViewById(R.id.imageUploadView);
}

public String getStringImage(Bitmap bmp){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] imageBytes = baos.toByteArray();
    String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
    return encodedImage;
}

private void uploadImage(){
    final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
    StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String s) {
                    loading.dismiss();
                    Toast.makeText(NewsUpload.this, s, Toast.LENGTH_LONG).show();
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError volleyError){
                    loading.dismiss();
                    Toast.makeText(NewsUpload.this, volleyError.getMessage().toString(), Toast.LENGTH_LONG).show();
                }
            }){
        @Override
            protected Map<String, String> getParams() throws AuthFailureError {
            String image = getStringImage(bitmap);
            String title = titleView.getText().toString().trim();
            String paragraph = paragraphView.getText().toString().trim();
            Map<String,String> params = new Hashtable<String, String>();
            params.put(KEY_IMAGE, image);
            params.put(KEY_TITLE, title);
            params.put(KEY_PARAGRAPH,paragraph);
            return params;
            }
    };
    RequestQueue requestQueue = MySingleton.getInstance(this).getRequestQueue(); // Mysingleton => Instance of Volley Class implemented seperately.
    stringRequest.setRetryPolicy(new DefaultRetryPolicy(20*1000,0,DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    requestQueue.add(stringRequest);
}

private void showFileChooser() {
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}

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

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
        Uri filePath = data.getData();
        try {
            bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
            imageView.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
@Override
public void onClick(View v) {
    if(v.getId()==chooseImage.getId()){
        showFileChooser();
    }

    if(v.getId() == uploadImage.getId()){
        uploadImage();
    }
}

}

Answer 1

我已将图像从手机上传到 NodeJS 服务器实际上我没有粘贴所有代码，因为最重要的是传输位图到字节

**

img_perfil.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent intent = new Intent();
                        logout.setText("Guardar Imagen");
                        intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
                        intent.addCategory(Intent.CATEGORY_OPENABLE);
                        intent.setType("image/*");

                        startActivityForResult(intent, RQS_OPEN_IMAGE);
                    }
                });



        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            if (resultCode == Activity.RESULT_OK) {


                if (requestCode == RQS_OPEN_IMAGE ||
                        requestCode == RQS_GET_IMAGE ||
                        requestCode == RQS_PICK_IMAGE) {

                    img_perfil.setImageBitmap(null);


                    Uri mediaUri = data.getData();
                   // textInfo1.setText(mediaUri.toString());
                    String mediaPath = mediaUri.getPath();
                    //textInfo2.setText(mediaPath);

                    //display the image
                    try {
                        inputStream = getBaseContext().getContentResolver().openInputStream(mediaUri);
                        bm = BitmapFactory.decodeStream(inputStream);
                        img_perfil.setImageBitmap(bm);
                        img_perfil.setScaleType(ImageView.ScaleType.FIT_START);
                        img_perfil.setAdjustViewBounds(true);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

     ByteArrayOutputStream bos = new ByteArrayOutputStream();
                        bm.compress(Bitmap.CompressFormat.JPEG, 100,bos);
                        byte[] b= bos.toByteArray();
                        String encodedImage = Base64.encodeToString(b, Base64.NO_WRAP | Base64.URL_SAFE | Base64.NO_PADDING);
                        new CargarDatos().execute("CHAT_SERVER_URL"+encodedImage,METHOD_POST);