将字符串路径转换为输入流

Question

我正在使用 Quickblox 聊天开发一个聊天应用程序 API 目前已经完成了用户注册、身份验证和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。

正在从 SD 卡中选择图像。 returns 字符串中的图片路径且未转换为 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, 数据);

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

InputStream = new ByteArrayInputStream(picturePath.toString().getBytes(Charset.defaultCharset()));
try { is = IOUtils.toInputStream(picturePath, "UTF-8"); } catch (IOException e1) { // TODO Auto-generated 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

经过大量努力和代码更改后，我完成了所需的工作。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..!!!

将字符串路径转换为输入流

converting string path to inputstream

java

string

android

inputstream

quickblox