Android :: Super Fast Autocomplete Using Binary Search In Sorted File
Sep 15, 2010
In my Android app I want to have an input field with autocomplete. The number of items will be about 300000. The best solution seems to be to put the items into a file (on sdcard), one item per line, each line would have the same number of characters so that I can seek to specific line number. If the user enters something in the text field, I would binary search (via RandomAccessFile) the file and show suggestions.I want the autocomplete to be super fast (ideally under 100ms but I guess it's impossible), what optimizations I can do?
Update 1:
I will convert the users input to lowercase english characters (a-z) with spaces. So 'A/b' would be converted to 'a b' and then searched.
Uodate 2:
I now realized I need additional thing - to search for word-starting substrings.
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Nov 2, 2010
I have some binary data (pixel values) in a int[] (or a byte[] if you prefer) that I want to write to disk in an Android app. I only want to use a small amount of processing time but want as much compression as I can for this. What are my options?In many cases the array will contain lots of consecutive zeros so something simple and fast like RLE compression would probably work well. I can't see any Android API functions for this though. If I have to loop over the array in Java, this will be very slow as there is no JIT on most Android devices. I could use the NDK but I'd rather avoid this if I can.
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Mar 17, 2010
I cannot seem to dictate the behavior of the onClick function.When a suggestion is clicked, it fires off the intent immediately. Is there a way for it to instead of firing off the intent immediately,simply copy and paste the suggestion as part of the search string?Eg. when typing in J,o,h the suggestion "John" comes up. When I click "John" can it copy that text into the search bar instead of immediately processing the search with John?I'm assuming theres a simple configuration which I cant seem to find.I dont want to go extensively into catching the fired of intent and re-processing etc
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Aug 2, 2010
I am new to android and I want to read a binary file extension .AMF file.I really need your help this is really urgent.
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Aug 5, 2010
Can anybody please tell me how to get double and int value from a binary file. I have tried alot but its giving me wrong values.
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Feb 23, 2009
I am having problems downloading a binary file (video) in my app from the internet. In Quicktime, If I download it directly it works fine but through my app somehow it get's messed up (even though they look exactly the same in a text editor).
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Sep 2, 2010
I have a binary file which contains image. I have to jump on different locations in file to read the image file. So far I am using mark and reset methods but these are not helping me as I want. And I am using Input Stream to read the file.
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Aug 17, 2010
i have a map file which has several tile images in the form of binary data. now i have to jump my index to different location of the file and read that tile. but i could not find anything helpful for me i also checked mark() and skip() methods.but not helping me.is there any method or class which can do what exactly i want or any hint you want to give me.
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Mar 2, 2009
I'm trying to unbundle a binary file (sound1.ogg) and store it on the sdcard.So it starts out as a raw resource (R.raw.sound1) and should end up as a copy named /sdcard/ mydir/sound1.ogg I wrote a method called something like copyResourceToFile() and did a copy via file descriptors / streams. But the target file just isn't right.If I do a buffered read, the target file ends up being WAY bigger - like 10x bigger.If I just do a byte-by-byte read for the size of the original file, the target file is the right size but is not the same file. Is there a simpler (well, correct/working) way to do this thing?
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Aug 13, 2010
I am developing a financial app that stores data in a file.I have noticed that text file i/o is pretty slow. If I switch to a binary format, how much faster will it be? 2x? 10x?I could write my own timing tests but I am hoping someone else has already done it.
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Oct 5, 2010
Can anybody have any idea how to read a binary file which resides in sdcard using Streams, like Inputstream, CountingInputStream or SwappedDataInputStream?I am using these three streams to read a file which is currently in the Resouces folder, but now i want to move that file in sdcard but I cannot change these stream because I have done so much work on it and I cannot roll back my work.i am doing it this way but its giving me FileNotFoundException.
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Sep 25, 2012
I bought an android 2.3.6 phone which no one has tried to root( it seems). So I was wondering if I could root it by creating an update.zip file containing the su binary and the superuser apk and then installing it in the recovery mode. Will this work? I have failed with gingerbreak, unlockroot and z4root.
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Jun 11, 2014
Update.zip file of su binary i had deleted my su binary by update.zip unroot method but now i can't get the root even i have superuser icon
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Jul 24, 2010
Using both Astro and the ES File Explorer included with Fresh 1.0.1, I'm trying to transfer files over my wifi from my computer to my SD card..Talk about SLOW, I could downloaded the files from the internet faster.I transferred a 175 meg TV show, took like 30 minutes, seriously.
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Apr 7, 2013
so I'm trying to write in "Update-Binary" in a Zip File .
In The Zip The Update-Binary is Located : META-INF < COM < GOOGLE < ANDROID < (Here)
I'm trying to write and edit some things into the file , which I have tried with NotePad++ and Notepad and WordPad . None will work ... When I go to Flash I have a Error right away since The Update binary is the system to start the Flash it won't work .
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Jun 15, 2013
I've tried looking around google, xda search tool, have read all pages (3 of them) in Xposed wiki. I've been trying to cheat in a game called Galaxy On Fire 2 HD (I have purchased it), I've found some tutorials how to do that on iOS by modifying some binary files (assetsdatainships.bin and items.bin), on android those files are in game apk, and I cannot modify them without breaking signature.
I found Xposed framework and I think it could be perfect for my purposes. Is there an easy way to replace those asset files by my own? I have very little programming skills though, but I'll try. I've found a short example in wiki, but I don't understand it. I've read wiki tutorial 2 times but still have only vague idea how all this works.
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Sep 22, 2010
I am currently trying to restore my phone so I can get froyo, I have bootloader 29.01. I followed directions to flash my droid x but it says after trying to flash Failed flash process. Phone[0000]: Phone is not compatible with multi-interface super-file. I am using RSD Lite v4.7.
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Sep 28, 2010
I am using MapView in my application.I ma getting "android.view.inflateException:Binary XML file line #43:Inflating Class<unknown>" Exception while loading the map second time. First Time it shows correctly
The XML file i am using shows here
The Code:.................
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Sep 14, 2010
I want a method to search the .mp3 .wma.ogg file in the sd card and show in the listview.
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Apr 13, 2009
I am new to Java and Android. I have a flat file (pipe-delimited) stored in R.raw called word list.text. I want to open this file and quickly search for a word I pass into my procedure. I've been searching for a simple way to do this but not having much luck. Can anyone share some code on how to do this?
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Sep 3, 2010
I my android application,i would like to read a text file which is placed on the sdcard. Read the file to search for a string: "some string" and would like to get the value for that string.
Is there any way that i can do that in android.
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Jul 29, 2010
I got my HTC Hero in January of this year, and until now, have had my pictures from my old phone in a separate folder from the photos taken on the Hero. I decided that I'd like them all combined to better organize my SD Card. I figured that if they were all renamed sequentially, the Photos app would sort them by name. (IMAG0001.jpg, IMAG0002.jpg, etc...) I used Automator on the Mac to run a workflow that sorted all my pictures by creation date, and renamed them in the sequential format stated previous. This is the format that the new photos taken on the Hero had. Once I re-opened the Photos app, all of my pictures were sorted funny. I'm quite upset about this.
I proceeded to modify creation and modification dates on the files, and still had the same sort order.
Does anyone know how the photos are sorted? How can I modify the sort order? How can I manipulate my photos so they'll sort properly?
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Aug 25, 2010
So lately, I've been converting some videos to mp4 so that I can watch during my travels. I'm just using the generic player and access my video files through "Photo" I sorted the files by Name, but when i go to Photo to view my videos i realise the Videos are not sorted. So it doesn't go in number like 1,2,3, instead it's a jumble. Is there a way I can sort this? Also why does it do this?
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Nov 9, 2009
My contacts are all sorted by first name. i cant seem to find how to change the sort order so the complete contact list is sorted by last name?
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Jun 13, 2010
Tried to find a relevant thread to post this at end of or perhaps that answers this and hopefully whoever knows where it is will just link to it and not be too unkind about my inability to find it.
I've never used any media player software to sort or tag my music ever. I have something like 10Gigs of fairly well encoded stuff and the collection grows over time, this time last year there was probably 8Gigs in the pile.
All my music is sorted by folders and in those folders they are usually named by track number, ie:
01. Astonomy Domine - Umma Gumma - Pink Floyd.
etc. etc.
I can't seem to find the way to get this 'music' app in android to sort by folder first and the multitude of '01. next song, next album' in a row in my music list is starting to really get me down.
I don't want any nonsense to get album art for me or even to try to figure out what album this is (byte allowance on plans in AU sucks pretty hard, OK?) or what order these songs should be in.
Simple form of question: What is the name of an app that doesn't try to be clever about your music collection, just sorts and plays it by "(1) FileFolder->(2) FileName"?
Is this possible with this app that comes with Android and calls itself 'music' in the list?
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Aug 8, 2009
I am looking for a good phone book app that would allow quick access to all of my contacts sorted by groups. All i want is a contact list with group name tabs at the top or something like that. But no... not a single app can do this. Come of them support groups, others dont, but all of them make you jump through hoops to change them on the fly.
So far I have tried:
The Original Android Contacts
Phonebook
aContacts
Contact Blast
Star Contacts
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Jul 24, 2010
Is it possible to have an EditTextPreference with AutoComplete attached to it?I know ho to attach one to an element with an id, but am having trouble figure out how to attach the ArrayAdapter to the preference field.This is wrong, but it's as close as I can get.
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May 6, 2010
I'm looking for something like the ASTRO processes manager that shows the current %CPU usage for every app running on the system. The only problem with ASTRO is that it doesn't sort by CPU usage so I have to scroll up and down looking at the % to see what is taking up CPU. A simple app that shows this information sorted by current CPU (like the top command in unix) would be great.
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Jul 23, 2010
I know in the Contacts app you can press the menu button to get to settings, but it looks like Motorola has removed the display options selection from the menu.
I want my contacts to be sorted by last name, but displayed as:
First Last
John Smith
So it is displaying the names correctly, but it is sorting them by first name instead of last. Is there a way to change this on the Droid X?
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Dec 5, 2009
So this is a response to another thread, that I never got a reaction on. Hopefully someone can give a hand. I have a AutoCompleteTextView with a CursorAdapter with data. I need to be able to set a text in the AutoCompleteTextView programmatically without the autocomplete mechanism kicking in. If I use *setText *on the AutoCompleteTextView it will start the autocomplete. I tried calling *dismissDropDown() after setText, but this dosnt work because the drop down is not shown yet.
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