从Google相册应用中获取Uri的路径 [英] Getting path from Uri from Google Photos app

问题描述

我有一个应用程序，可以使用外部应用程序选择照片.然后，我从uri中获取照片的路径，并将其用于内部操作.

I have an app which allows to select photos with an external app. Then I take the path of the photo from the uri and use it for internal actions.

当用户使用Google相册选择照片时，如果该照片是本地存储的，则下一个代码可以正常工作.但是，如果图片在云中，则 cursor.getString(index)的结果为空.

When user selects a photo with Google Photo, if the picture is locally stored then the next code works perfectly. But if the picture is in the cloud the result of cursor.getString(index) is null.

我已经搜索了一些信息，但不确定解决方案

I've search for some info, but not sure about the solution

final String[] projection = { "_data" };
Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);

if (cursor != null && cursor.moveToFirst()) {
    final int index = cursor.getColumnIndexOrThrow("_data");
    return cursor.getString(index);
}

谢谢！

推荐答案

最后，根据@CommonsWare答案以及有关此问题的上一篇文章，我解决了从uri获取InputStream的问题，处理成一个新的临时文件并传递路径到我需要使用的功能.

Finally and according to @CommonsWare answer and the previous post about this issue I solved getting the InputStream from the uri, coping into a new temporal file and passing the path to the function I need to use.

这是简化的代码:

public String getImagePathFromInputStreamUri(Uri uri) {
    InputStream inputStream = null;
    String filePath = null;

    if (uri.getAuthority() != null) {
        try {
            inputStream = getContentResolver().openInputStream(uri); // context needed
            File photoFile = createTemporalFileFrom(inputStream);

            filePath = photoFile.getPath();

        } catch (FileNotFoundException e) {
            // log
        } catch (IOException e) {
            // log
        }finally {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    return filePath;
}

private File createTemporalFileFrom(InputStream inputStream) throws IOException {
    File targetFile = null;

    if (inputStream != null) {
        int read;
        byte[] buffer = new byte[8 * 1024];

        targetFile = createTemporalFile();
        OutputStream outputStream = new FileOutputStream(targetFile);

        while ((read = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, read);
        }
        outputStream.flush();

        try {
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return targetFile;
}

private File createTemporalFile() {
    return new File(getExternalCacheDir(), "tempFile.jpg"); // context needed
}

这篇关于从Google相册应用中获取Uri的路径的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！