将捕获的图像上传到Web服务器时发生NullPointerException

Question

尝试从图库上传图像并从相机图像捕获图像到Web服务器。画廊中的图像成功上传，但捕获的图像未成功上传。有错误：

 java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {my-pack-name/my-pack-name.my-activity-name}: java.lang.NullPointerException: uriString

清单：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-feature android:name="android.hardware.camera.any" android:required="true" />
<uses-feature android:name="android.hardware.camera.autofocus"
android:required="false" />

提供者：

<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="my-pack-name.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths"/>
</provider>

文件路径：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <!--<external-path name="images" path="."/>-->
    <external-path name="my_images" path="Android/data/my-pack-name/files/Pictures" />
</paths>

活动方法：

private void dispatchTakePictureIntent() {

    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        photoFile = null;
        try {
            photoFile = createImageFile();
            displayMessage(getBaseContext(),photoFile.getAbsolutePath());
            Log.i("May",photoFile.getAbsolutePath());
        } catch (IOException ex) {
            Toast.makeText(this,"error",Toast.LENGTH_LONG).show();
        }
        if (photoFile != null) {
            photoURI = FileProvider.getUriForFile(this,"my-pack-name.fileprovider",photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch(requestCode){
        case REQUEST_PERMISSION:
        {
            if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED)
                Toast.makeText(this,"permissions granted", LENGTH_LONG).show();
            else Toast.makeText(this,"permissions denied", LENGTH_LONG).show();
        }
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
     if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {

             Bitmap myBitmap = BitmapFactory.decodeFile(photoFile.getAbsolutePath());
             iView.setImageBitmap(myBitmap);

         /*   Bundle extras = data.getExtras();
            Bitmap imageBitmap = (Bitmap) extras.get("data");*/

           if (Build.VERSION.SDK_INT == Build.VERSION_CODES.M) {
                selectedFileURI = data.getData();
                result = new File(selectedFileURI.getPath());
            }
            else{
            selectedFileURI = getImageUri(getApplicationContext(), myBitmap);
            result = new File(getRealPathFromURI(selectedFileURI));}

    }
    if (resultCode == RESULT_OK && requestCode == REQUEST_GALLERY) {
           //some code
    }
}

private Uri getImageUri(Context applicationContext, Bitmap imageBitmap) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

    String path = MediaStore.Images.Media.insertImage(applicationContext.getContentResolver(), imageBitmap, "Title", null);
    return Uri.parse(path);
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = "";
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
        timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    }
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,
            ".jpg",
            storageDir
    );
    currentPhotoPath = image.getAbsolutePath();
    return image;
}

public String getRealPathFromURI(Uri uri) { Cursor cursor = getContentResolver().query(uri, null, null, null, null);
    cursor.moveToFirst();
    int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
    return cursor.getString(idx);
}

private void uploadFile() {
   // selectedFileURI = Uri.parse("file:///sdcard/img.png");
   // if(selectedFileURI !=null){
        if(result !=null){
        dialog=new ProgressDialog(ChooseSecondPhotoActivity.this);
        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        dialog.setMessage("Uploading...");
        dialog.setIndeterminate(false);
        dialog.setMax(100);
        dialog.setCancelable(false);
        dialog.show();
     // File file=FileUtils.getFile(this,selectedFileURI);

      //  File file = new File(selectedFileURI.toString());

            //String filePath=PathUtil.getPath(this,selectedFileURI);

            // File file= new File(filePath);

            //  ProgressRequestBody requestFile=new ProgressRequestBody(file,this);
            //final MultipartBody.Part body=MultipartBody.Part.createFormData("uploaded_file", file.getName(),requestFile);
            ProgressRequestBody requestFile=new ProgressRequestBody(result,this);
            final MultipartBody.Part body=MultipartBody.Part.createFormData("uploaded_file", result.getName(),requestFile);

            new Thread(new Runnable() {
                @Override
                public void run() {
                    mService.uploadFile(body)
                            .enqueue(new Callback<String>() {
                                @Override
                                public void onResponse(Call<String> call, Response<String> response) {
                                    dialog.dismiss();
                                    Toast.makeText(ChooseSecondPhotoActivity.this,"Uploaded!", Toast.LENGTH_LONG).show();
                                }

                                @Override
                                public void onFailure(Call<String> call, Throwable t) {
                                    dialog.dismiss();
                                    Toast.makeText(ChooseSecondPhotoActivity.this,t.getMessage(), Toast.LENGTH_LONG).show();
                                }
                            });
                }
            }).start();
        }
}