java - 将字符串路径转换为输入流

Question

我正在使用 Quickblox 聊天 API 开发一个聊天应用程序，目前已经完成了用户注册、身份验证以及基本的点对点聊天和群聊。现在实现视频、图像和文件发送但是在某些部分卡住了。

1. 正在从 SD 卡中选择图像。返回字符串中的图片路径，它不会转换为 inputStream。在 SOF 上尝试了大约 10-15 个答案。我的代码如下:

       Intent i = new Intent(Intent.ACTION_PICK,
               android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
   
       startActivityForResult(i, RESULT_LOAD_IMAGE);
   

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

   if (requestCode == RESULT_LOAD_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.moveToFirst();
   
       int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
       String picturePath = cursor.getString(columnIndex);
       cursor.close();
   
       Bitmap imagebitmap=BitmapFactory.decodeFile(picturePath);
   
       byte[] b=picturePath.getBytes(Charset.forName("UTF-8"));
   
       InputStream is = new ByteArrayInputStream(b);
   
       File newFile = FileHelper.getFileInputStream(is, "sample.jpg", "myFile");
   
       Boolean fileIsPublic = false;
   
       QBContent.uploadFileTask(newFile, fileIsPublic, null, new QBEntityCallbackImpl<QBFile>()
               {
           public void onSuccess(QBFile file, Bundle params) {
   
               //creating message
   
               QBChatMessage chatmessage=new QBChatMessage();
               chatmessage.setProperty("save_to_history", "1");    //saves messsage to history
   
               QBAttachment qbAttachment=new QBAttachment("photo");
               qbAttachment.setId(file.getId().toString());
   
               chatmessage.addAttachment(qbAttachment);
   
               try
               {
                   chat.sendMessage(chatmessage);
   
                   Toast.makeText(getApplicationContext(), "Image Uploaded Successfully", Toast.LENGTH_SHORT).show();
   
               } catch (XMPPException e) {
                   Log.e(TAG, "failed to send a image", e);
               } catch (SmackException sme){
                   Log.e(TAG, "failed to send a image", sme);
               }
   
           }
   
           public void onError(java.util.List<String> errors) {
   
               AlertDialog.Builder dialog = new AlertDialog.Builder(ChatActivity.this);
               dialog.setMessage("error when sending image: " + errors.toString()).create().show();
   
   
           };});}
   

也尝试过这些代码来生成输入流

1. InputStream is = new ByteArrayInputStream(picturePath.toString().getBytes(Charset.defaultCharset()));

2. 尝试{
is = IOUtils.toInputStream(picturePath, "UTF-8");
} catch (IOException e1){
//TODO 自动生成的 catch block
e1.printStackTrace();
}

代码在 myfile 文件夹中生成新的 sample.jpg。它不创造。它坏了。但如果我选择静态，那么它就完美无缺。

谢谢你的副词。不知道我做错了什么......任何帮助都会非常明显2.我是

Answer 1

经过大量的努力和代码更改后，我完成了我需要的。我没有使用输入流，而是使用了 ByteArrayInputStream。首先将我的字符串 picturepath 转换为位图(不知道我为什么这样做......但是做了)十使用以下代码将该位图转换为 ByteArrayInputStream

ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
        imagebitmap.compress(CompressFormat.PNG, 0 /*ignored for PNG*/, bos); 
        byte[] bitmapdata = bos.toByteArray();
        ByteArrayInputStream bs = new ByteArrayInputStream(bitmapdata);

并将结果发送到我的函数....成功..!!!