Question

使用凌空发送上传图片android没有问题，但问题出现在第一张图片上传i点击上传按钮时，相同的图片将再次上传，即使没有选择但仍然发送以前的图像。如果选择第一张图片上传并选择其他图片上传则没有问题。

使用volley和mysingleton发送数据。

这是ImageUpload.java

import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import android.widget.ImageView;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;

public class ImageUpload extends AppCompatActivity implements View.OnClickListener{

private static final String IMAGE_DIRECTORY = "/demonuts";
private Button buttonUpload, buttonChoose;
private ImageView imageView;
private Bitmap bitmap;
private final int GALLERY = 1, CAMERA = 2;

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

    imageView = (ImageView) findViewById(R.id.imageView);
    buttonUpload = (Button) findViewById(R.id.buttonUpload);
    buttonChoose = (Button) findViewById(R.id.buttonChoose);

    buttonChoose.setOnClickListener(this);
    buttonUpload.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.buttonChoose:
            showPictureDialog();
            break;


        case R.id.buttonUpload:
            uploadImage();
            break;
    }
}

private void showPictureDialog(){
    AlertDialog.Builder pictureDialog = new AlertDialog.Builder(this);
    pictureDialog.setTitle("Select Action");
    String[] pictureDialogItems = {
            "Select photo from gallery",
            "Capture photo from camera" };
    pictureDialog.setItems(pictureDialogItems,
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    switch (which) {
                        case 0:
                            choosePhotoFromGallary();
                            break;
                        case 1:
                            takePhotoFromCamera();
                            break;
                    }
                }
            });
    pictureDialog.show();
}

public void choosePhotoFromGallary() {
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(intent, GALLERY);
}

private void takePhotoFromCamera() {
    Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    startActivityForResult(intent, CAMERA);
}


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

        return;
    }
    if (requestCode == GALLERY && resultCode == RESULT_OK) {
        if (data != null) {
            Uri path = data.getData();
            try {
                bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), path);
                imageView.setImageBitmap(bitmap);
                imageView.setVisibility(View.VISIBLE);

            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(ImageUpload.this, "Failed!", Toast.LENGTH_SHORT).show();
            }
        }

    } else if (requestCode == CAMERA && resultCode == RESULT_OK) {
        bitmap = (Bitmap) data.getExtras().get("data");
        imageView.setImageBitmap(bitmap);
        saveImage(bitmap);
        imageView.setVisibility(View.VISIBLE);
        Toast.makeText(ImageUpload.this, "Image Saved!", Toast.LENGTH_SHORT).show();
    }

}

public String saveImage(Bitmap myBitmap) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
    File wallpaperDirectory = new File(
            Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
    // have the object build the directory structure, if needed.
    if (!wallpaperDirectory.exists()) {
        wallpaperDirectory.mkdirs();
    }

    try {
        File f = new File(wallpaperDirectory, Calendar.getInstance()
                .getTimeInMillis() + ".jpg");
        f.createNewFile();
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());
        MediaScannerConnection.scanFile(this,
                new String[]{f.getPath()},
                new String[]{"image/jpeg"}, null);
        fo.close();
        Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());

        return f.getAbsolutePath();
    } catch (IOException e1) {
        e1.printStackTrace();
    }
    return "";
}

private void uploadImage(){
    StringRequest stringRequest = new StringRequest(Request.Method.POST,
            Constants.URL_UPLOAD,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonObject = new JSONObject(response);
                        String Response = jsonObject.getString("message");
                        Toast.makeText(ImageUpload.this,Response,Toast.LENGTH_LONG).show();

                        imageView.setImageResource(0);
                        imageView.setVisibility(View.GONE);

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

                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                }
            }){
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String,String> params = new HashMap<>();
            params.put("image",imageToString(bitmap));

            return params;
        }
    };

    MySingleton.getInstance(ImageUpload.this).addToRequestQueue(stringRequest);
}

private String imageToString(Bitmap bitmap){
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG,100,byteArrayOutputStream);
    byte[] imgBytes = byteArrayOutputStream.toByteArray();
    return Base64.encodeToString(imgBytes,Base64.DEFAULT);
}
}

这是用于检索帖子图像的php文件，仅用于测试使用随机名称。

$response = array();
$name = rand(1,10);
$uploadpath = "../upload/$name.jpg";


if($_SERVER['REQUEST_METHOD'] == 'POST'){
if(empty($_POST['image'])){
  $response['error'] = true;
  $response['message'] = "Please choose images";
}else{
  $image = $_POST['image'];
  file_put_contents($uploadpath, base64_decode($image));
  $response['error'] = false;
  $response['message'] = "Image upload succesfully";
}
}else{
  $response['error'] = true;
  $response['message'] = "Please choose images";
   }

echo json_encode($response);

Answer 1

用这个替换你的方法

@Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String,String> params = new HashMap<>();
            params.put("image",imageToString(bitmap));
            bitmap=null;
           return params;
        }

＆安培;上传前检查

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.buttonChoose:
            showPictureDialog();
            break;


        case R.id.buttonUpload:
        if(bitmap!=null)
         uploadImage();
        else
        Toast.makeText(this, "add image first", Toast.LENGTH_SHORT).show();
            break;
    }
}

android studio图片上传仍然发送相同的图像甚至没有选中

1 个答案: