我正在构建一个可以拍照的Android应用,然后将它们上传到Rails API。
api期望base64编码的原始文件字节存储为以JPG格式表示图像的临时文件。
但是,API拒绝上传的文件,并显示以下错误消息:
<Paperclip::Errors::NotIdentifiedByImageMagickError:
这似乎是由于Android应用程序部分编码失败。
我发送的base64图像字节如下所示:
仅通过查看它就显得无效。
图像是在android中通过使用Camera API和base64编码生成的byteArray创建的:
String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);
任何人都知道我在这里做错了吗?
答案 0 :(得分:2)
按钮单击以从相机捕获图像使用此
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
((Activity) context).startActivityForResult(intent, Constants.REQUEST_IMAGE_CAPTURE);
并在activity的activityResult上实现以下代码:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
final ImageView uploadArea = (ImageView) attachmentDialog.findViewById(R.id.uploadArea);
Bitmap bitmap;
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
File f = new File(Environment.getExternalStorageDirectory().toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("temp.jpg")) {
f = temp;
break;
}
}
try {
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),
bitmapOptions);
Matrix matrix = new Matrix();
matrix.postRotate(-90);
Bitmap rotatedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
rotatedBitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] attachmentBytes = byteArrayOutputStream.toByteArray();
String attachmentData = Base64.encodeToString(attachmentBytes, Base64.DEFAULT);
uploadArea.setImageBitmap(rotatedBitmap);
String path = android.os.Environment
.getExternalStorageDirectory()
+ File.separator
+ "CTSTemp" + File.separator + "default";
f.delete();
OutputStream outFile = null;
File file = new File(path, String.valueOf(System.currentTimeMillis()) + ".jpg");
try {
outFile = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, outFile);
outFile.flush();
outFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
我希望这对您有所帮助,如有任何进一步的信息,请询问