Android :: Java - How Many Bytes Has A Connection Downloaded
Feb 16, 2010
An Android app I'm writing involves quite a lot of downloading of content (think podcatcher/RSS).
I would like to be able to give the user an indication of how many bytes they've downloaded, so they can make the decision whether they want to use Wifi or not.
To this end, I have found a way of counting the number of bytes read by the app, by wrapping an InputStream in a simple CountingInputStream.
However, this does not take into consideration basic things like packet headers and HTTP headers. More importantly, it does not take into consideration any compression that content may be encoded with.
So, how many bytes did my application download over the network? I'm not so interested in the number of bytes uploaded, but if know how, don't be shy.
I have gone down a fairly low level approach as I am feeding the input stream into an XML PullParser. I will also be needing to do a similar exercise with dumping bytes (images in this case) straight onto the SD Card.
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May 24, 2010
I have a frame of 22 bytes. The frame is the input stream from an accelerometer via bluetooth. The acceleromter readings are a 16 bit number split over two bytes.
When i try to merge the bytes with buffer[1] + buffer[2], rather than adding the bytes, it just puts the results side by side. so 1+2 = 12.
How to combine these two bytes to obtain the original number. (btw the bytes are sent little endian)
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Nov 24, 2010
I have a problem.
1 - From a webservice. NET 2008 (vb), I have a method that returns an array of bytes, the byte array is actually a string "Hola Mundo" ("Hello World" in English) compressed with the Class of System.IO.Compression GZipStream.
2 - The method returns the string "Hola Mundo" compressed, and this is what the webservice returns:
CODE:..............
3 - if I do a test from a windows application from Visual Basic. NET to run this method returns me this string and Unzip with another function I have, it brings me the "Hola Mundo" ....
4 - On Android (Eclipse) and I managed to make the request and bring me the previous string ... but do not know how to decompress and show me "Hola Mundo" ...
5 - I have tried several codes from the web, but none work.
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Nov 12, 2010
I have php page in my webserver, i want to get this page result in android. I have search a lot for mysql android connection someone says that it is possible through "new URL" in java. But i cannot catch this method. Actually i want to implement a login page for android. I have already created a login page in php. Now i want to just post username and password value to php page the php page will check the data with database and if user is a valid user i need to redirect otherwise i will show an error message.
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Jul 17, 2009
i got this (java.net.SocketException: Connection reset ) exception on server program when i try to read inputStream sent by client. BufferedReader.readLine(); is anybody know what can be the reason for this exception?
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Jun 21, 2010
I'm trying to open tcp connection between android (emulator) and PC. I'm trying to create a new socket and then it crash. the line where it crash: Socket s = new Socket("10.0.2.2", 27015);
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Nov 20, 2009
Running Eclipse on Ubuntu 9.10, connected real HTC Dream which works just fine on another (Windows) machine.
CODE:.....................
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Apr 17, 2009
I'm getting:java.net.ConnectException: localhost/127.0.0.1:8000 - Connection refused and...i have <uses-permission android:name="android.permission.INTERNET" /> declared in my manifest.xml What am I missing?
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Jul 8, 2010
I'm doing Major Project on my final year and I'm very new to Android plus I;m not good at codings. I need help with my login page.
I've created something like a database connection java file which is this:
CODE:.......
I've already created a database for users using SQLite. The database name is Users and the table is called User. The records inside the table are Username, Password, LastName, FirstName. I've inserted one user's info into the database. The problem is I do not know whether my UserDB.java is correct.
And I've also created login.java. Hardcoded Login page:
CODE:.........
So I want to know how I should apply the database connection on the login.java. Should I insert database connection something like db.Open();? I studied ASP.Net a few months back and I kind of forget most of what I've learnt. So how should I open the database connection on login.java and how to check with database whether the user enters the right username and password?
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Apr 23, 2009
I captured an image by android G1, now trying to display it as ImageView but it gives me memory allocation exception.
CODE:.............
The default image resolution of G1 camera is 2048 * 1536
I also tried to compress image on selection but still same exception.
CODE:.............
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Aug 13, 2010
I have a 16mb binary file and I want to read bytes without using any loop. like if i want to read 16 byte i can pass 16 to some method(if there is any) and it give me my desired result... right now i am using loop for reading bytes but my application is so huge i am afraid that it do not get slow.
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Nov 27, 2009
I'm trying to get a byte array of an image saved locally on the phone. I'm using the code...
How can I get the Bytes?
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Nov 24, 2009
I wrote a simple test driver to test the bluetooth apis. Anyone can verify whether I am using the API correctly?
Everything seems good but no data read:
Before calling the following, inquiry scan successfully returned, and the remote device is pre-paired.
CODE:..............
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May 27, 2010
I am using the AudioRecord class to analize raw pcm bytes as it comes in the mic.
So thats working nicely. Now i need convert the pcm bytes into decibel.
I have a formula that takes sound presure in Pa into db. db = 20 * log10(Pa/ref Pa)
So the question is the bytes i am getting from audiorecorder from the buffer what is it is it amplitude pascal sound pressure or what.
I tried to putting the value into te formula but it comes back with very hight db so i do not think its right
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Jan 22, 2010
I have a function I am using to upload files. How can I get the number of bytes of the file that have been uploaded (transferred)? Can I setup a timer that does this? If so, what variable to I read to get the number of bytes uploaded?
Here is my code:
CODE:....................
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Oct 13, 2010
I create data file in android for my application in the app's data directory. The write is successful with no exceptions but file contents are not complete. It truncates at 90112 bytes. Any idea what is going on ? Is there a limit ?
Here is the snippet
CODE:....................
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Sep 27, 2010
Am trying to store all images in my server, then i need to show based on requirements, i am able to store and restore bitmap bytes but i cant recreate the bitmap using stored bytes , pls find my code below and suggest me a solution if i doing wrong.
Converting Bitmap to Bytes. Code...
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Sep 22, 2010
I'm developing an android video uploading app and uploading large amounts of video is a problem, I get different type of exception sometimes (host not resolved, pipe broken), I do a multipart POST but I have a feeling if I upload chunk of bytes one at at time that'll increase upload speed as well as solve connection timeout and these type of problems.
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Feb 1, 2010
I am trying to follow the instructions on this page to create a trace file. I can see the file in File Explorer in DDMS and can pull it onto my PC but it is zero bytes long.
Any suggestions as to what I might be doing wrong, please?
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Jul 11, 2010
I've tried recording video using MediaRecorder API but the file that gets saved each time is of 0 bytes.
I use the MediaRecorder recorder = new MediaRecorder(); ad then recorder.setVideoSource . . .recorder.prepare() to generate the preview and when the user clicks record, i say recorder.start() but the file recorded is of 0 bytes. And after some time, recorder.stop() -on user click that is.
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Aug 30, 2010
I'm building an android app and I'm currently having trouble retrieving a bitmap from an URL.
Here is the code I'm using :
CODE:..........
Everything works fine when the picture's write but when some bytes are wrong, result gets null. I think it's basically expectable as it's written this in the doc of BitmapFactory.decodeStream :
If the input stream is null, or cannot be used to decode a bitmap, the function returns null. The stream's position will be where ever it was after the encoded data was read.
The problem is, my wrong picture is well interpreted by my web browser and I can do so on iPhone platform.
Is there a way to sort of ignore those wrong pixels? maybe with the option parameter?
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Sep 1, 2013
I bought iball andi 5li android smart phone a few days back. The configuration of the phone is:
512mb ram
4gb internal
1.2ghz cortex a9 processor
android 4.1.2
Although my device runs almost every app out there (including temple run, subway surfers etc.) but occasionally im facing problems.
Problem occurs after 3-4 days of restarting the phone. When i restart and check the ram usage it says 350 mb (approx) as used and 150mb(approx) as free ram every app runs smoothly but as days pass by gradually the free ram starts decreasing down to 30 mb where all the apps (games and browsers) start crashing with a low memory message. then the conditions get worse after approx 2 hrs free ram is now 0.0 bytes and even the launcher,settings etc crash with a low memory message. The only solution out is to restart the phone.
[used androids before and is quite aware of closing or killing apps but none is working]
Already Tried:
# removing apps from recent list
# stopping apps from Setting>apps>running apps & cached apps as well
# restoring to factory defaults
# used ram freeing apps (no change on ram)
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Nov 9, 2010
I'm developing an android app that will play mp3 files. However the mp3 files are encrypted on the sd card or sqlite. Either ways, after decryption, i'll have a stream of bytes. How do i play them? MediaPlayer does not take inputstream as parameter, so i cannot consider that.
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Aug 29, 2010
what are the different numbers under the "bytes" section of the app when running?
Is the second number how much i have used or is it the first number ?
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May 19, 2010
i have two files
App.java
Gallery.java
App. java contains frontend buttons and functionalities Gallery.java lists the imagesin the sd card. i want to call Gallery.java in click event in app.java
App.java
package gallery.display;
import android.app.Activity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;...........
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Mar 16, 2009
I'm trying to call a java method from javascript using addJavascriptInterface(); but seems does not work, it always display "failure"; java code...
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Aug 8, 2009
Java packages like Java.io, Java.Lang etc used in android, are they different from Java packages in windows ? means specially made for android ?
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Oct 14, 2009
I'm using ThreadSafeClientConnManager to manage a pool of client connections, because my application has several threads, which are simultaneously connecting to a webserver.
Abstract sample code:
CODE:..............
Now lets say on of this threads is downloading a large file, but then the user of my application is switching to another activity/screen. Therefor the file is needless and I'd like to abort this download connection.
In ThreadSafeClientConnManager I found this method: public ClientConnectionRequest requestConnection (HttpRoute route, Object state) Returns a new ClientConnectionRequest, from which a ManagedClientConnection can be obtained or the request can be aborted.
So far I've been using:
CODE:.........
Now from what I understand, I've to use:
httpclient.getConnectionManager().requestConnection(HttpRoute route, Object state);
And that's the point where I'm stuck. I assume that for the route I can just use new HttpRoute(new HttpHost("10.0.0.1")) or whatever my server is, but what to put in for Object state?
And second, as soon as I've the ClientConnectionManager I can call getConnection(long timeout, TimeUnit tunit). But then from there, how I do I execute my HttpGet httpRequest = new HttpGet(URL_TO_FILE); as I did before with HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);?
I've been gone through the documentation and tried out quite a few different things, but I wasn't able to obtain a working solution. Therefor any suggestions and/or code examples are more than welcome.
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May 12, 2010
Whenever a application needs internet and connection fails, I get a message dialog
Connection failed
This application requires network access. Enable mobile network or Wi-Fi to download data.
and two buttons, Settings, Cancel.
How do I detect there is no internet connection?
How do I popup a same dialog in my application?
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Oct 27, 2010
I'm coding a very basic FTP client on top of my application and I have 2 activities. The first one is the file explorer and the second one is the image viewer. Once I click on the image filename on the explorer, I want to pass the connection to the other activity to handle extra stuff. Basically, I want to keep the same org.apache.commons.net.ftp.FTPClient object (which handles the connection) alive in-between the 2 activities. I know I can't pass an object inside an intent so I don't know what my best bets are.
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