FileNotFoundException Android 找不到文件

Question

您好，我正在嘗試將文件從我的 android 設備上傳到我的服務器。 在我的虛擬設備上一切正常，但在我的實際設備上我一直收到找不到文件的錯誤。 下面是我的代碼，請有人幫助我

public int uploadFile(final String selectedFilePath) {

    int serverResponseCode = 0;

    HttpURLConnection connection;
    DataOutputStream dataOutputStream;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";


    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1 * 1024 * 1024;
    File selectedFile = new File(selectedFilePath);


    String[] parts = selectedFilePath.split("/");
    final String fileName = parts[parts.length - 1];

    if (!selectedFile.isFile()) {
        dialog.dismiss();

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                tvFileName.setText("Source File Doesn't Exist: " + selectedFilePath);
            }
        });
        return 0;
    } else {
        try {

            FileInputStream fileInputStream = new FileInputStream(selectedFile);

            URL url = new URL(SERVER_URL);
            connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);//Allow Inputs
            connection.setDoOutput(true);//Allow Outputs
            connection.setUseCaches(false);//Don't use a cached Copy
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.setRequestProperty("ENCTYPE", "multipart/form-data");
            connection.setRequestProperty(
                    "Content-Type", "multipart/form-data;boundary=" + boundary);
            connection.setRequestProperty("uploaded_file",selectedFilePath);

            //creating new dataoutputstream
            dataOutputStream = new DataOutputStream(connection.getOutputStream());

            //writing bytes to data outputstream
            dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
            dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
                    + selectedFilePath + "\"" + lineEnd);

            dataOutputStream.writeBytes(lineEnd);

            //returns no. of bytes present in fileInputStream
            bytesAvailable = fileInputStream.available();
            //selecting the buffer size as minimum of available bytes or 1 MB
            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            //setting the buffer as byte array of size of bufferSize
            buffer = new byte[bufferSize];

            //reads bytes from FileInputStream(from 0th index of buffer to buffersize)
            bytesRead = fileInputStream.read(buffer, 0, bufferSize);


            //loop repeats till bytesRead = -1, i.e., no bytes are left to read
            while (bytesRead > 0) {

                try {
                    //write the bytes read from inputstream
                    dataOutputStream.write(buffer, 0, bufferSize);
                } catch (OutOfMemoryError e) {
                    Toast.makeText(createindiv.this, "Insufficient Memory!", Toast.LENGTH_SHORT).show();
                }
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);
            }

            dataOutputStream.writeBytes(lineEnd);
            dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

            try{
                serverResponseCode = connection.getResponseCode();
            }catch (OutOfMemoryError e){
                Toast.makeText(createindiv.this, "Memory Insufficient!", Toast.LENGTH_SHORT).show();
            }
            String serverResponseMessage = connection.getResponseMessage();

            Log.i(TAG, "Server Response is: " + serverResponseMessage + ": " + serverResponseCode);

            //response code of 200 indicates the server status OK
            if (serverResponseCode == 200) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        names=    name.getText().toString();
                        aboutz =  about.getText().toString();

                        createindivads loadm = new createindivads();
                        loadm.execute(names, aboutz, username, fileName,"");

                        tvFileName.setText("File Upload completed.\n\n You can see the uploaded file here: \n\n" + "https://waksmat.com/api/videos/" + fileName);
                    }
                });
            }

            //closing the input and output streams
            fileInputStream.close();
            dataOutputStream.flush();
            dataOutputStream.close();

            if (wakeLock.isHeld()) {

                wakeLock.release();
            }


        } catch (FileNotFoundException e) {
            e.printStackTrace();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(createindiv.this, "File Not Found", Toast.LENGTH_SHORT).show();
                }
            });
        } catch (MalformedURLException e) {
            e.printStackTrace();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(createindiv.this, "URL Error!", Toast.LENGTH_SHORT).show();
                }
            });

        } catch (IOException e) {
            e.printStackTrace();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(createindiv.this, "Cannot Read/Write File", Toast.LENGTH_SHORT).show();
                }
            });
        }
        dialog.dismiss();
        return serverResponseCode;
    }

}

在我的日志貓中，我得到了我的絕對路徑字符串，我可以看到該文件已存儲。 我正在使用 sdk 29 開發應用程序

下面是我的日志貓

I/chatty：uid=10070(brianyobra.bramcode.thuo) FinalizerDaemon 相同的 1 行 W/System：資源無法調用結束。 E/eglCodecCommon：goldfish_dma_create_region：無法獲取到設備的 fd：fd -1 errno=2 I/MainActivity：選定的文件路徑。/storage/emulated/0/DCIM/Camera/IMG_20210826_061358:jpg I/MainActivity：服務器響應是：OK : 200

Answer 1

我發現了我的錯誤。 我沒有把這個小代碼片段放在我的 android 清單中 (android:requestLegacyExternalStorage="true") 謝謝大家的幫助