从应用程序将图片保存到图库

Question

我刚刚开始在java中编写代码并且正在创建一个Android应用程序，它可以拍摄照片并将图像保存到我的gallery文件夹中。我的应用程序拍摄照片，但由于某种原因，它无法保存图像。

static final int REQUEST_IMAGE_CAPTURE = 1;
public void onClickbtnCamera(View v){


        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    }     




  private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date(0));
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
        );

        // Save a file: path for use with ACTION_VIEW intents
        mCurrentPhotoPath = "/storage/emulated/0/DCIM/Camera/:" + image.getAbsolutePath();
        return image;

    }

  static final int REQUEST_TAKE_PHOTO = 1;

  private void dispatchTakePictureIntent() {
      Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
      // Ensure that there's a camera activity to handle the intent
      if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
          // Create the File where the photo should go
          File photoFile = null;
          try {
              photoFile = createImageFile();
          } catch (IOException ex) {
              // Error occurred while creating the File

          }
          // Continue only if the File was successfully created
          if (photoFile != null) {
              takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                      Uri.fromFile(photoFile));
              startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
          }
      }
  }
  private void galleryAddPic() {
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        File f = new File(mCurrentPhotoPath);
        Uri contentUri = Uri.fromFile(f);
        mediaScanIntent.setData(contentUri);
        this.sendBroadcast(mediaScanIntent);
    }