如何在 Android 中以编程方式将图像文件从图库复制到另一个文件夹

Question

我想从图库中选择图像并将其复制到 SDCard 中的其他文件夹中。

从图库中选取图像的代码

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
    photoPickerIntent.setType("image/*");
    startActivityForResult(photoPickerIntent, REQUEST_CODE_CHOOSE_PICTURE_FROM_GALLARY);

我在ActivityResult 上得到 content://media/external/images/media/681 这个 URI。

我想复制图像，

形式 path ="content://media/external/images/media/681

到 path = "file:///mnt/sdcard/sharedresources/< /code> Android 中 sdcard 的这个路径。

如何做到这一点？

Answer 1

感谢大家...工作代码在这里..

     private OnClickListener photoAlbumListener = new OnClickListener(){
          @Override
          public void onClick(View arg0) {
            Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
            imagepath = Environment.getExternalStorageDirectory()+"/sharedresources/"+HelperFunctions.getDateTimeForFileName()+".png";
            uriImagePath = Uri.fromFile(new File(imagepath));
            photoPickerIntent.setType("image/*");
            photoPickerIntent.putExtra(MediaStore.EXTRA_OUTPUT,uriImagePath);
            photoPickerIntent.putExtra("outputFormat",Bitmap.CompressFormat.PNG.name());
            photoPickerIntent.putExtra("return-data", true);
            startActivityForResult(photoPickerIntent, REQUEST_CODE_CHOOSE_PICTURE_FROM_GALLARY);

          }
      };

   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
           if (resultCode == RESULT_OK) {
                switch(requestCode){
               
              
                 case 22:
                        Log.d("onActivityResult","uriImagePath Gallary :"+data.getData().toString());
                        Intent intentGallary = new Intent(mContext, ShareInfoActivity.class);
                        intentGallary.putExtra(IMAGE_DATA, uriImagePath);
                        intentGallary.putExtra(TYPE, "photo");
                        File f = new File(imagepath);
                        if (!f.exists())
                        {
                            try {
                                f.createNewFile();
                                copyFile(new File(getRealPathFromURI(data.getData())), f);
                            } catch (IOException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                        }
                        
                        startActivity(intentGallary);
                        finish();
                 break;
                 
                 
                }
              }
           
           
        
          
        
   }

   private void copyFile(File sourceFile, File destFile) throws IOException {
            if (!sourceFile.exists()) {
                return;
            }
            
            FileChannel source = null;
                FileChannel destination = null;
                source = new FileInputStream(sourceFile).getChannel();
                destination = new FileOutputStream(destFile).getChannel();
                if (destination != null && source != null) {
                    destination.transferFrom(source, 0, source.size());
                }
                if (source != null) {
                    source.close();
                }
                if (destination != null) {
                    destination.close();
                }
            
            
    }

    private String getRealPathFromURI(Uri contentUri) {
    
       String[] proj = { MediaStore.Video.Media.DATA };
       Cursor cursor = managedQuery(contentUri, proj, null, null, null);
       int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
       cursor.moveToFirst();
       return cursor.getString(column_index);
    }

Answer 2

OutputStream out;
            String root = Environment.getExternalStorageDirectory().getAbsolutePath()+"/";
            File createDir = new File(root+"Folder Name"+File.separator);
            if(!createDir.exists()) {
                createDir.mkdir();
            }
            File file = new File(root + "Folder Name" + File.separator +"Name of File");
            file.createNewFile();
            out = new FileOutputStream(file);                       

        out.write(data);
        out.close();

希望它能帮助你

Answer 3

一种解决方案是，

1）从所选文件的 inputStream 读取字节。

<块引用>

我在ActivityResult 上得到“content://media/external/images/media/681”这个 URI。
你可以通过查询你得到的这个Uri来获取文件名。获取它的输入流。将其读入byte[]。

给你/

Uri u = Uri.Parse("content://media/external/images/media/681");

游标cursor = contentResolver.query(u, null, null, null, null);
有一个列名“_data”，它将返回您的文件名，从文件名您可以创建输入流，

您现在可以读取此输入流

         byte data=new byte[fis.available()];
          fis.read(data);

所以您有带有图像字节的数据（字节数组）

2）在SD卡上创建一个文件，并且使用第一步中获取的 byte[] 进行写入。

       File file=new File(fileOnSD.getAbsolutePath() +"your foldername", fileName);
        FileOutputStream fout=new FileOutputStream(file, false);
        fout.write(data);

作为您已从查询方法中获得的文件名，请在此处使用相同的文件名。

Answer 4

正在阅读此链接，这里他们讲的是Java中复制文件的四种方式，
与 Android 也相关。

尽管作者得出结论，使用 @Prashant 的答案中使用的“通道”是最好的方法，但您甚至可以探索其他方法。

（我已经尝试过前两个，并且都可以找到）

Answer 5

尽管我已经赞成@AAnkit的答案，但我借用并继续修改了一些项目。他提到使用Cursor，但如果没有正确的说明，新手可能会感到困惑。

我认为这比得票最多的答案更简单。

String mCurrentPhotoPath = "";


private File createImageFile() throws IOException {
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );

    mCurrentPhotoPath = image.getAbsolutePath();
    return image;
}


                   /*Then I proceed to select from gallery and when its done selecting it calls back the onActivityResult where I do some magic*/


private void snapOrSelectPicture() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                    "com.example.android.fileprovider",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(Intent.createChooser(takePictureIntent, "SELECT FILE"), 1001);
        }
    }
}

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

        try {
            /*data.getDataString() contains your path="content://media/external/images/media/681 */

            Uri u = Uri.parse(data.getDataString());
            Cursor cursor = getContentResolver().query(u, null, null, null, null);
            cursor.moveToFirst();
            File doc = new File(cursor.getString(cursor.getColumnIndex("_data")));
            File dnote = new File(mCurrentPhotoPath);
            FileOutputStream fout = new FileOutputStream(dnote, false);
            fout.write(Files.toByteArray(doc));
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

Answer 6

您可以使用此函数中的内容解析器将图像文件复制到任何其他文件夹

fun copyImageFileToMediaStore(
    context: Context,
    sourceFilePath: String,
    destinationFolder: File
) {
    val sourceFile = File(sourceFilePath)
    val extension = MimeTypeMap.getFileExtensionFromUrl(sourceFilePath)
    val mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension)
    val fileName = sourceFile.name
    val inputStream = FileInputStream(sourceFile)
    val resolver: ContentResolver = context.contentResolver

    // Check if a file with the same name already exists in the destination folder
    val projection = arrayOf(MediaStore.MediaColumns._ID)
    val selection =
        "${MediaStore.MediaColumns.DISPLAY_NAME} = ? AND ${MediaStore.MediaColumns.RELATIVE_PATH} = ? AND ${MediaStore.MediaColumns.DATA} = ?"
    val selectionArgs = arrayOf(
        fileName,
        "${destinationFolder.path}/",
        destinationFolder.absolutePath + File.separator + fileName
    )
    val cursor = resolver.query(
        MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
        projection,
        selection,
        selectionArgs,
        null
    )
    if (cursor != null && cursor.count > 0) {
        // File already exists in the MediaStore, do not insert it again
        cursor.close()
        return
    }

    // File does not exist in the MediaStore, insert it
    val values = ContentValues().apply {
        put(MediaStore.MediaColumns.DISPLAY_NAME, fileName)
        put(MediaStore.MediaColumns.MIME_TYPE, mimeType)
        put(MediaStore.MediaColumns.RELATIVE_PATH, destinationFolder.parent)
        put(
            MediaStore.MediaColumns.DATA,
            destinationFolder.absolutePath + File.separator + fileName
        )
    }
    var outputStream: FileOutputStream? = null
    var uri: Uri? = null
    try {
        val contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
        uri = resolver.insert(contentUri, values)
        if (uri == null) {
            throw IOException("Failed to create new MediaStore record.")
        }
        outputStream = resolver.openOutputStream(uri) as FileOutputStream?
        if (outputStream == null) {
            throw IOException("Failed to get output stream.")
        }
        val buffer = ByteArray(4 * 1024)
        var read: Int
        while (inputStream.read(buffer).also { read = it } != -1) {
            outputStream.write(buffer, 0, read)
        }
        outputStream.flush()
    } catch (e: IOException) {
        uri?.let { resolver.delete(it, null, null) }
        uri = null
    } finally {
        inputStream.close()
        outputStream?.close()
    }
}

目录 像这样调用此函数

    val destinationFolder = File("/storage/emulted/0/DCIM/foldername")
    val sourceFilePath = "/storage/emulted/0/DCIM/anyOtherFolder/abcd.jpeg"
    copyImageFileToMediaStore(requireContext(), sourceFilePath, destinationFolder)