Question

当我添加时，我试图在画廊中获取所有媒体的Uri。例如。用途拍照。我自动收到包含Uri的意图。我定位的是Apis 21-26，Android在不使用JobObservers的情况下删除了在Api 25中执行此操作的功能。我不知道如何使用JobObserver执行此操作。有人可以帮忙吗？

Answer 1

要与jobcheduler一起使用，请使用这些内容uris

JobInfo.Builder builder = new JobInfo.Builder(ASJOBSERVICE_JOB_ID, new ComponentName("co.intellidev.storj", JobSchedulerService.class.getName()));
            builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, flag));
            builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Images.Media.INTERNAL_CONTENT_URI, flag));
            builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, flag));
            builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Video.Media.INTERNAL_CONTENT_URI, flag));

Answer 2

首先，FileOberver是一种内存杀手方法。考虑大量文件。相反，ContentObserver似乎是一种更好的方法。

getContentResolver().registerContentObserver(android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI, true, 
        new ContentObserver(new Handler()) {
            @Override
            public void onChange(boolean selfChange) {
                Log.d("your_tag","Internal Media has been changed");
                super.onChange(selfChange);
                Long timestamp = readLastDateFromMediaStore(context, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
                // comapare with your stored last value and do what you need to do

            }
        }
    );
getContentResolver().registerContentObserver(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, 
    new ContentObserver(new Handler()) {
        @Override
        public void onChange(boolean selfChange) {
            Log.d("your_tag","External Media has been changed");
            super.onChange(selfChange);

            Long timestamp = readLastDateFromMediaStore(context, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            // comapare with your stored last value and do what you need to do
        }
        }

);

private Long readLastDateFromMediaStore(Context context, Uri uri) {
        Cursor cursor = context.getContentResolver().query(uri, null, null, null, "date_added DESC");
        PhotoHolder media = null;
        Long dateAdded =-1;
        if (cursor.moveToNext()) {
            Long dateAdded = cursor.getLong(cursor.getColumnIndexOrThrow(MediaColumns.DATE_ADDED));         
        }
        cursor.close();
        return dateAdded;
}

如何在画廊中获取Uri的新媒体？

2 个答案: