storage

Android create folders in Internal Memory

由 那年仲夏 提交于 2019-11-26 14:38:17
Is there any way/ is it allowed to create folders in Internal Memory in Android. Example : - data -- com.test.app (application's main package) ---databases (database files) ---files (private files for application) ---shared_prefs (shared preferences) ---users (folder which I want to create) Can I create users folder in Internal Memory for example? I used this to create folder/file in internal memory : File mydir = context.getDir("mydir", Context.MODE_PRIVATE); //Creating an internal dir; File fileWithinMyDir = new File(mydir, "myfile"); //Getting a file within the dir. FileOutputStream out =

Why are Spark Parquet files for an aggregate larger than the original?

由 僤鯓⒐⒋嵵緔 提交于 2019-11-26 14:31:55
问题 I am trying to create an aggregate file for end users to utilize to avoid having them process multiple sources with much larger files. To do that I: A) iterate through all source folders, stripping out 12 fields that are most commonly requested, spinning out parquet files in a new location where these results are co-located. B) I try to go back through the files created in step A and re-aggregate them by grouping by the 12 fields to reduce it to a summary row for each unique combination. What

Making sense of Postgres row sizes

由 痞子三分冷 提交于 2019-11-26 13:22:11
I got a large (>100M rows) Postgres table with structure {integer, integer, integer, timestamp without time zone}. I expected the size of a row to be 3*integer + 1*timestamp = 3*4 + 1*8 = 20 bytes. In reality the row size is pg_relation_size(tbl) / count(*) = 52 bytes. Why? (No deletes are done against the table: pg_relation_size(tbl, 'fsm') ~= 0) Calculation of row size is much more complex than that. Storage is typically partitioned in 8 kB data pages . There is a small fixed overhead per page, possible remainders not big enough to fit another tuple, and more importantly dead rows or a

How to get my Android device Internal Download Folder path [duplicate]

由 让人想犯罪 __ 提交于 2019-11-26 13:07:49
问题 This question already has an answer here: how to access downloads folder in android? 5 answers It is possible to get the Android device Internal Download Folder path? 回答1: if a device has an SD card, you use: Environment.getExternalStorageState() if you don't have an SD card, you use: Environment.getDataDirectory() if there is no SD card, you can create your own directory on the device locally. //if there is no SD card, create new directory objects to make directory on device if (Environment

Android SharedPreferences limitations?

由 [亡魂溺海] 提交于 2019-11-26 12:31:52
问题 I developed a game on Android. I am currently saving most of the game stats in a Database. However the app does not utilize more than a single row in the DB. I am now interested in introducing some new stats but this will cause my DB to re-install and thus clear out everyone\'s progress. In order to avoid this in the future I am considering storing the game stats with SharedPreferences instead. My question is how many different things can be stored that way before it becomes a problem. In

where is the best place to save images from users upload

由 最后都变了- 提交于 2019-11-26 12:16:49
问题 I have a website that shows galleries. Users can upload their own content from the web (by entering a URL) or by uploading a picture from their computer. I am storing the URL in the database which works fine for the first use case but I need to figure out where to store the actual images if a user does a upload from their computer. Is there any recommendation here or best practice on where I should store these? Should I save them in the appdata or content folders? Should they not be stored

Core Data - Storing Images (iPhone) [closed]

由 巧了我就是萌 提交于 2019-11-26 11:31:37
I have an application where I allow the user to add an image for their account. I wish to know how to store an image (obtained from the camera or photo library) using Core Data , as I may offer a backup facility for the user and would be looking to transfer the image data to a server. I have come across the design suggestion of creating an Image model object and creating a 1-to-1 relationship with the User model object (so that the associated Image object is not called up unless required). However, I am unsure how to practically store the image and whether this is potentially fatal in terms of

C++ string literal data type storage

由 一世执手 提交于 2019-11-26 11:21:12
问题 void f() { char *c = \"Hello World!\" } Where is the string stored? What\'s the property of it? I just know it is a constant, what else? Can I return it from inside of the function body? 回答1: it is packaged with your binary -- by packaged I mean hard-wired, so yes you can return it and use it elsewhere -- you won't be able to alter it though, and I strongly suggest you declare it as: const char * x = "hello world"; 回答2: The string is stored in the data area of the program. This is completely

Android getting external storage Absolute Path

由 天涯浪子 提交于 2019-11-26 11:18:40
问题 I want to download some files and save them into the internal storage of the phone/tab. Tried on Samsung Galaxy Note 2 and Galaxt Tab 10.1. When I use /storage/sdcard0/ on them the code runs successfully but when I use Galaxy Nexus 3 the code fails. I want to get absolute path of the phoe or tab\'s internal storage\' Absolute Path . Does it possible, if so how? 回答1: When I use /storage/sdcard0/ on them the code runs successfully but when I use Galaxy Nexus 3 the code fails. /storage/sdcard0/

Write file to location other than SDcard using Android NDK?

由 陌路散爱 提交于 2019-11-26 11:14:31
问题 Is there any other way to write a file somewhere else than on the SD card? I tried many different path on the filesystem but fopen always return NULL, except for any file that I write/read inside the /sdcard/... Is there something else equivalent to: <uses-permission android:name=\"android.permission.WRITE_EXTERNAL_STORAGE\"/> That allow you to write like on the file system or something? 回答1: You can always access the directory in which your app is placed. This directory is usually : data
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