Android :: Reading Binary File From Sdcard Using Stream Classes
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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Feb 18, 2010
I have 2 binary files that i would like to package with my apk. (/res/raw) i need to copy these 2 files to /sdcard when the application is run. how can i do this?
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Feb 22, 2009
I've got some code that downloads mp3s remotely over a streaming url connection... This all works fine but my problem is once the file is complete and I pull up the music app it's not there. A reboot of the phone and it now shows up... anyone know how to force this refresh to occur from without my code?
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Nov 19, 2010
I've been implementing a logcat reader in java which uses the binary output of logcat (-B switch) rather than the text based formats. My code works for many of the entries, but frequently the binary log entries have an extra byte inserted which I can't account for, making the payload the wrong size.
From looking at various bits of the c++ code for both the logcat program itself and the logging apis, the binary format seems to be:
CODE:...........
Payload section of the header is (payloadlength bytes total):
CODE:...............
This file defines the struct: http://www.google.com/codesearch/p?hl=en#2wSbThBwwIw/include/cutils/l...
The extra byte I'm seeing occours after the nanosecond timestamp and before the log priority of the payload. e.g. Here is a hex dump of one of the log entries with the phantom byte:
The byte (in this instance) is 0x1D at offset 0x14 0000:
CODE:.......
The extra byte shifts the payload by 1, so the payload length becomes incorrect. I can't see where this byte is coming from.
I also tried the LogReceiver class in ddmlib, but that also fails to handle extra byte and produces garbage after it hits an entry with the extra byte: [url]
Here is a quick python script which demonstrates the problem. It reads and prints binary log entries in the expected format. It will raise an exception when it encounters an entry with an unexpected byte: [url]
The logcat program itself successfully reinterprets the binary format without jumping through any hoops, so I can only guess it's some kind of struct alignment artifact. Anyone encountered this or got any idea why the extra byte is appearing?
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Aug 13, 2009
I'm running into a strange problem while reading from an Input Stream on the Android platform. I'm not sure if this is an Android specific issue, or something I'm doing wrong in general. The only thing that is Android specific is this call:
Input Stream is = getResources().openRawResource(R.raw.myfile);
This returns an Input Stream for a file from the Android assets. Anyways, here's where I run into the issue:
bytes[] buffer = new bytes[2];
is.read(buffer);
When the read() executes it throws an IOException. The weird thing is that if I do two sequential single byte reads (or any number of single byte reads), there is no exception. Ie, this works:
byte buffer;
buffer = (byte)buffer.read();
buffer = (byte)buffer.read();
Any idea why two sequential single byte reads work but one call to read both at once throws an exception? The Input Stream seems fine... is.available() returns over a million bytes (as it should).
Stack trace shows these lines just before the Input Stream.read():
java.io.IOException
at android.content.res.AssetManager.readAsset(Native Method)
at android.content.res.AssetManager.access$800(AssetManager.java:36)
at android.content.res.AssetManager$AssetInputStream.read(AssetManager.java:542)
Changing the buffer size to a single byte still throws the error. It looks like the exception is only raised when reading into a byte array.
If I truncate the file to 100,000 bytes (file is: 1,917,408 bytes originally) it works fine. Is there a problem with files over a certain size?
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Aug 11, 2009
First, sorry but my English is bad. I'm developing an app for android. I use a function (see below) for transfer a file on the network. removed some code...
Two situation: -S1: in is get from a socket and out is a locale file -S2: in is the local file and out is get from a socket
Well ! S1 and S2 work on the emulator. But, on a real device, S1 make some problem. The file is mixed :/ ! For example i would to transfer this text: "123456789ABCDEF 123456789ABCDEF 123456789ABCDEF 123456789ABCDEF 123456789ABCDEF 123456789ABCDEF 123456789ABCDEF" But i receive this: "123456789ABCDEF 12345678923456789ABCDEF 123456789ABCDEF 123456789ABCDEF 12345678ABCDEF 123456789ABCDEF 123456789ABCDEF 123456789" (not really a real example) The content received have same size as the source. Look at this: "123456789ABCDEF" is send and "12345678ABCDEF" is received.
How does it is possible ? Someone can help me?
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Jul 23, 2009
I'm downloading text data from a web server, and getting an Input Stream. The data will be relatively large and delimited. I want to split this data by the deliminator and store each piece in the DB. Is it faster to read the Input Stream byte by byte to split the data and store each piece in the DB, or would it be faster to convert the Input Stream to a String and use an existing function such as Split?
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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 18, 2009
I downloaded the android source code.. how to make our own jar file with all our available java classes in the Android source code....
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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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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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Sep 8, 2010
I am new to android development and am currently working my way through the "Hello..." Tutorials on the developer website.
I got stuck on the Tab Layout walkthrough and the only way I could resolve it was to put each Activity Class in a separate .java file.
I was wondering if all Activities need to be in separate .java files, or am I missing something.
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Oct 7, 2009
Is there a way to unzip and see what files exists in classes.dex file. Are there winzip like utilities for .dex viewers.
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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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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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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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Aug 12, 2009
If i have a apk file and want to know the package name and class hierarchy, how do i do it?
Suppose I have some sample APK file named "SampApp.apk" which contains classes inside "com.android.sampApp".
Is there any tool in Android SDK which shows the package name when APK file is passed as a parameter.
As the Class files are compressed to dex file I am not able to check the actual package name.
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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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Oct 27, 2010
I'm trying to read from a file while it still opened for witing.
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Oct 19, 2010
If I am going to be reading files from the SD Card, where do I put them during development? Also, when I install the app, will it include these files and put them to the SD Card?
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Sep 23, 2010
How to read a specific file from sd card. I have pushed the file in sd card through DDMS and I am trying to read it though this way but this give me exception. Can anybody tell me how to point exactly on that file? My code is this.
String path = Environment.getExternalStorageDirectory().getAbsolutePath();
FileInputStream iStream = new FileInputStream(path);
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Aug 27, 2010
I have the following error but cannot workout the problem, i am READING MP3 files and the below error seems to come as it tries to WRITE MP4 files.
CODE:.......
Error comes after calling the above and passing the first MP3 file
CODE:.....................
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Apr 3, 2010
Is there any class generators to process web services in Android/Java? I may have to write my own to generate classes against WSDL but I'm trying not to. Also is there one for REST services as well?
If not providing me with discovery service suggestions like disco/wsdl are good enough.
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Jun 16, 2009
I am getting java.lang.ExceptionInInitializerError while reading yml file.The code that i am using for reading yml file is InputStream inputdatfile=Myclass.this.getResources().openRawResource (R.raw.datafile); Map<String, List<Map>> data = (Map<String, List<Map>>)Yaml.load (inputdatfile); I am getting the error in the second line.My yml file is in res aw folder. the external jar file i am using here to read yml file is jyaml1.3.jar. i tried to add <uses-library android:name="org.ho.yml" / > in manifest file that time i am not able to install the app in
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Sep 26, 2010
I've figured out how to draw Arabic characters properly (connected and right to left) using string literals like this:
textView.setTypeFace(Typeface.createFromAssets(getAssets(),"DejaVuSans.ttf"));
textView.setText("uFEB3uFE92uFE98uFE94");
But for some reason I cannot get the arabic to format properly if I read anything from a file using InputStreams like this:.....................
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