Question

我正在尝试使用翻新版2.0上传图片。在onActivityResult中获取uri后，我尝试从uri中获取路径，该路径为null。相同的代码可在棒棒糖之前的设备中完美运行。

String[] filePathColumn = { MediaStore.Image.Media.DATA };
Cursor cursor = context.getContentResolver().query(inputUri,
                filePathColumn, null, null, null);
if (cursor != null) {
   cursor.moveToFirst();
   int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
   String filePath = cursor.getString(columnIndex);
   cursor.close();
// filePath is always null
   if (filePath != null && !filePath.isEmpty()) {
       file = new File(filePath);
   }
}

Answer 1

这里是完全有效的代码，用于从使用所有api的内容提供商那里拍摄最后一张照片：

      public ArrayList<String> getNewPicturesUri(JobParameters parameters) {
    ArrayList<String> newPictures = new ArrayList<>();

    if (parameters.getTriggeredContentAuthorities() != null) {
        if (parameters.getTriggeredContentUris() != null) {
            ArrayList<String> ids = new ArrayList<>();
            for (Uri uri : parameters.getTriggeredContentUris()) {
                List<String> path = uri.getPathSegments();
                if (path != null && path.size() ==
                        Media.EXTERNAL_CONTENT_URI.getPathSegments().size() + 1) {
                    ids.add(path.get(path.size() - 1));
                }
            }

            if (ids.size() > 0) {
                StringBuilder selection = new StringBuilder();
                for (int i = 0; i < ids.size(); i++) {
                    if (selection.length() > 0) {
                        selection.append(" OR ");
                    }
                    selection.append(MediaStore.Images.ImageColumns._ID);
                    selection.append("='");
                    selection.append(ids.get(i));
                    selection.append("'");
                }

                Cursor cursor = null;
                try {
                    String[] projection = new String[]{
                            MediaStore.Images.ImageColumns._ID,
                            MediaStore.Images.ImageColumns.DATA};

                    cursor = getContentResolver().query(
                            Media.EXTERNAL_CONTENT_URI,
                            projection, selection.toString(), null, null);

                    if (cursor != null) {
                        while (cursor.moveToNext()) {
                            newPictures.add(cursor.getString(PROJECTION_DATA));
                        }
                    }
                } catch (SecurityException exception) {
                    FirebaseCrash.report(exception);
                } finally {
                    if (cursor != null) {
                        cursor.close();
                    }
                }
            }
        }
    }
    return newPictures;
}

如何从Android Pie中的内容URI获取文件路径

1 个答案: