Question

我按照Android开发人员文档的Take photo指南拍照。我想将此图片用于Firebase MLKit，但是我只是临时需要它，所以我将其保存到我的私人存储中，并在使用后删除（提取文本）。
因此，我正在使用一个Intent来为我进行捕获并将其保存到特定文件中。 如果Intent完成，如何提取图片，以便将位图传递给Firebase API？
在前面提到的文档中，它说

注意：如果将照片保存到getExternalFilesDir（）提供的目录中，则媒体扫描器将无法访问文件，因为它们是应用程序专用的文件。

但是它没有说明如何访问该文件。这是我的问题：如何访问？

对于到目前为止对我的代码感兴趣的所有人：

public class MainActivity extends AppCompatActivity {

static final int REQUEST_TAKE_PHOTO = 1;
private Uri photoURI;

//ToDo: delete picture at the end of app usage [finally->delete]

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

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) {
            //ToDo:Logging/Toast msg
            // Error occurred while creating the File

        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            photoURI = FileProvider.getUriForFile(this,
                    "mypackagename",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        } else {
            //ToDo: logging/Toast msg
        }
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == Activity.RESULT_OK && requestCode == REQUEST_TAKE_PHOTO){
        //This is where I need to access the picture I saved.
    }else{
        //ToDo: logging/Toast msg
    }
}

public void scanText(View view) {
  //Firebase stuff, not relevant
}

String mCurrentPhotoPath;

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

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = image.getAbsolutePath();
    return image;
}
}

Answer 1

添加此行以获取图像位图

 if(resultCode == Activity.RESULT_OK && requestCode == REQUEST_TAKE_PHOTO)
  {
    //This is where I need to access the picture I saved.
    // get the image bitmap from this code
     Bitmap imageBitmap = (Bitmap) data.getExtras().get("data");
  }
  else
  {
    //ToDo: logging/Toast msg
  }

从外部文件目录获取图片

1 个答案: