图像文件缺少 exif 数据

Question

使用 intent 拍摄照片，稍后上传到服务器。图像首先像这样保存到 sdcard:

/**
 * Creating file uri to store image/video
 */
public Uri getOutputMediaFileUri(int type) {
    return Uri.fromFile(getOutputMediaFile(type));
}

/**
 * returning image / video
 */
private static File getOutputMediaFile(int type) {

    // External sdcard location
    File mediaStorageDir = new File(
            Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
            Config.IMAGE_DIRECTORY_NAME);

    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(TAG, "Oops! Failed create "
                    + Config.IMAGE_DIRECTORY_NAME + " directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");
    } else if (type == MEDIA_TYPE_VIDEO) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "VID_" + timeStamp + ".mp4");
    } else {
        return null;
    }

    return mediaFile;
}

保存的图片没有exif数据。是因为uri吗？（使用默认相机应用拍摄的照片有 exif 数据，所以它一定是我的应用中的一个问题）。

编辑：用于启动默认相机应用程序的代码：

/**
 * Launching camera app to capture image
 */
private void captureImage() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

    // start the image capture Intent
    startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}

url 存储：

/**
 * Here we store the file url as it will be null after returning from camera
 * app
 */
@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    // save file url in bundle as it will be null on screen orientation
    // changes
    outState.putParcelable("file_uri", fileUri);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);

    // get the file url
    fileUri = savedInstanceState.getParcelable("file_uri");
}

来源：http://www.androidhive.info/2014/12/android-uploading-camera-image-video-to-server-with-progress-bar/

Answer 1

photos taken with the default camera app has exif data so it has to be an issue in my app

不一定。从您显示的代码来看，它似乎是该特定相机应用程序中的错误。并非所有相机应用开发者都ACTION_IMAGE_CAPTURE 测试得很好。除非您在拍摄照片后但在运行 EXIF 测试之前的某个时间修改图像，否则相机应用程序不会向通过 ACTION_IMAGE_CAPTURE 拍摄的照片添加 EXIF 标签。 These things happen.

您可以安装一些相机应用程序并查看它们在 ACTION_IMAGE_CAPTURE 中的表现。例如，Open Camera 支持 ACTION_IMAGE_CAPTURE，但我还没有测试它在 ACTION_IMAGE_CAPTURE 时的 EXIF 行为。

图像文件缺少 exif 数据

Image file missing exif data

android

exif

android-image

android-camera-intent

android-external-storage