使用意图上传图片

Posted 2023-04-19

【中文标题】使用意图上传图片

【英文标题】：Image Upload using intent

【发布时间】：2015-12-25 19:27:28

【问题描述】：

我正在尝试为我的 android 移动应用程序上传图片。该代码适用于从图库文件夹上传的图像。但是，如果我从“最近的图像”、“文档”、“下载”中选择任何图像，则图像路径未提取并且无法上传图像。你能帮我解决这个问题吗？

这是我的代码供您参考：

package com.example.imageupload;



public class MainActivity extends Activity 

    private ImageView image;
    private Button uploadButton;
    private Bitmap bitmap;
    private Button selectImageButton, takeImageButton;
    String link = uri;
    // number of images to select
    private static final int PICK_IMAGE = 1;
    private static final int CAMERA_REQUEST = 1888;

    /**
     * called when the activity is first created
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // find the views
        image = (ImageView) findViewById(R.id.uploadImage);
        uploadButton = (Button) findViewById(R.id.uploadButton);
        takeImageButton = (Button) findViewById(R.id.takeImageButton);
        selectImageButton = (Button) findViewById(R.id.selectImageButton);

        selectImageButton.setOnClickListener(new OnClickListener() 

            @Override
            public void onClick(View v) 
                selectImageFromGallery();

            
        );


        // when uploadButton is clicked
        uploadButton.setOnClickListener(new OnClickListener() 

            @Override
            public void onClick(View v) 
                // new ImageUploadTask().execute();
                Toast.makeText(MainActivity.this, "clicked", Toast.LENGTH_SHORT)
                        .show();
                uploadTask();
            
        );
    

    protected void uploadTask() 
        // TODO Auto-generated method stub
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bitmap.compress(CompressFormat.JPEG, 100, bos);
        byte[] data = bos.toByteArray();
        String file = Base64.encodeToString(data, 0);
        Log.i("base64 string", "base64 string: " + file);
        new ImageUploadTask(file).execute();
    

    /**
     * Opens dialog picker, so the user can select image from the gallery. The
     * result is returned in the method <code>onActivityResult()</code>
     */
    public void selectImageFromGallery() 
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"),
                PICK_IMAGE);
    

    /**
     * Retrives the result returned from selecting image, by invoking the method
     * <code>selectImageFromGallery()</code>
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == PICK_IMAGE && resultCode == RESULT_OK
                && null != data) 

            Uri selectedImage = data.getData();
            String[] filePathColumn =  MediaStore.Images.Media.DATA ;

            /*
             * Cursor cursor = getContentResolver().query(selectedImage,
             * filePathColumn, null, null, null);
             */

            Cursor cursor = managedQuery(selectedImage, filePathColumn, null,
                    null, null);
            cursor.moveToFirst();

            // int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            int columnIndex = cursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            String picturePath = cursor.getString(columnIndex);
            Log.i("picturePath", "picturePath: " + picturePath);
            cursor.close();

            decodeFile(picturePath);

           


    public void decodeFile(String filePath) 
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, o);

        // The new size we want to scale to
        final int REQUIRED_SIZE = 1024;

        // Find the correct scale value. It should be the power of 2.
        int width_tmp = o.outWidth, height_tmp = o.outHeight;
        int scale = 1;
        while (true) 
            if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE)
                break;
            width_tmp /= 2;
            height_tmp /= 2;
            scale *= 2;
        

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        bitmap = BitmapFactory.decodeFile(filePath, o2);

        image.setImageBitmap(bitmap);
    

    /**
     * The class connects with server and uploads the photo
     * 
     * 
     */
    class ImageUploadTask extends AsyncTask<Void, Void, String> 

        String base64_string;

        public ImageUploadTask(String file) 
            // TODO Auto-generated constructor stub
            this.base64_string = file;
        

        @Override
        protected String doInBackground(Void... params) 
            // TODO Auto-generated method stub

            ArrayList<NameValuePair> postData;
            postData = new ArrayList<NameValuePair>();

            JSONObject parentData = new JSONObject();
            JSONObject childData = new JSONObject();

            try 

                childData.put("fileContent", base64_string);
                childData.put("fileName", "droid.jpeg");
                childData.put("fileType", "I");

                // System.out.println(childData);

                parentData.put("mobile", childData);

                System.out.println(parentData);

             catch (JSONException e) 
                e.printStackTrace();
            

            // postData.add(new BasicNameValuePair("User",
            // childData.toString()));

            InputStream is = null;
            String jsonResponse = "";
            JSONObject jObj = null;

            try 

                DefaultHttpClient httpClient = new DefaultHttpClient();

                HttpPost request = new HttpPost(
                        "URL");

                request.setHeader("Content-Type", "application/json");
                request.setEntity(new StringEntity(parentData.toString()));

                HttpResponse httpResponse = httpClient.execute(request);
                System.out.println(httpResponse);

                // HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                System.out.println(httpEntity);
                is = httpEntity.getContent();
                System.out.println(is);
                System.out.println(is.toString());

                try 
                    Log.e("@@@@@@@@@@", "@@@@@@@@@@@");
                    BufferedReader reader = new BufferedReader(
                            new InputStreamReader(is, "iso-8859-1"), 8);
                    StringBuilder sb = new StringBuilder();
                    String line = null;
                    while ((line = reader.readLine()) != null) 
                        sb.append(line + "\n");
                    
                    is.close();
                    jsonResponse = sb.toString();
                    Log.e("JSON", "Check Json: " + jsonResponse);

                 catch (Exception e) 
                    Log.e("Buffer Error",
                            "Error converting result " + e.toString());
                

             catch (UnsupportedEncodingException e) 
                e.printStackTrace();
             catch (ClientProtocolException e) 
                e.printStackTrace();
             catch (IOException e) 
                e.printStackTrace();
            

            return null;
        

    

【问题讨论】：

你有什么解决办法吗？我面临同样的问题。

@HarshalBhatt，我对我的代码进行了以下更改，它运行良好。请尝试一下，prntscr.com/b53eut

是的，它成功了。谢谢！

@HarshalBhatt，请您在下面向上回答我的答案。

【参考方案1】：

我只是将代码更改如下：

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

    if (requestCode == PICK_IMAGE && null != data) 
        if (resultCode == getActivity().RESULT_OK) 
            selectedImage = data.getData();
            Log.i("selectedImage", "selectedImage: " + selectedImage.toString());
            String[] filePathColumn = MediaStore.Images.Media.DATA;

            Cursor cursor = getActivity().getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();
            int columnIndex = cursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();

            Log.i("columnIndex", "columnIndex: " + columnIndex);

            String picturePath = cursor.getString(columnIndex);
            Log.i("picturePath", "picturePath: " + picturePath);
            cursor.close();

        
    




  public void selectImageFromGallery()
Intent galleryIntent = new Intent(Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(galleryIntent, PICK_IMAGE);