Android :: Resuming Large File Download
Sep 17, 2009
I am trying to implement the functionality to resume a large file download, but have not found how to start downloading from a position that is not at the beginning of an InputStream.I am currently using the InputStream.skip() method to go to the position where I want to resume the download, but have found that this method actually reads all the data over the network and then throws it away.I would appreciate some help in learning the correct way to start reading from the resume offset of the internet file being downloaded, so that I can avoid wasting the phone network bandwidth, and also avoid the extra time delay caused by re-downloading all the data that was already previously downloaded.
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Apr 14, 2010
I'm trying to download large file from Internet (>20Mb)
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Nov 2, 2010
I'm trying to download a large .zip file from a web server but I have a weird behaviour, the description is:
- I'm executing the code in the device emulator, API level 3 (version 1.5) with an SD card of 512MB. I start the device with "Wipe data user"
- The length of the size from conexion.getContentLength() is 7012725
- The server address is localhost (10.0.2.2), but I've tried with an external server and the behaviour is the same. I've double checked that I can download the file through a web browser.
- I have these permisions in the manifest file:
CODE:.............
The error:
- It starts downloading the file, I can see the text 10, 20, 30, 40, 50 and then it stops at 60. - After a while, the emulator reboots itself.
Workarounds:
- About the possible wifi lock, what I've done is add this permission "android.permission.WAKE_LOCK" and then this piece of code, but with exactly the same behaviour:
CODE:.............
Here is the code, that it's being executing in a separate thread:
CODE:.............
more log description:
CODE:................
Could anyone try my code and download a zip file with size round 8MB? Does it works for you?
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Jun 2, 2010
I was trying to d/l a large mp3 file off the internet from my desire (110mb)
It didnt manage to d/l, i was wondering if the part is had d/l is lurking somewere on the sd card, if so where can i locate it?
Ive had a root around looking with Astro but to no avail...
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Jul 26, 2010
I have a large bitmap (say 3888x2592) in a file. Now, I want to resize that bitmap to 800x533 and save it to another file.I normally would scale the bitmap by calling Bitmap.createBitmap method but it needs a source bitmap as the first argument, which I can't provide because loading the original image into a Bitmap object would of course exceed the memory (see here, for example).Is there a way to read a large image file with 10MP or more and save it to a new image file, resized to a specific new width and height, without getting an OutOfMemory exception?I also tried BitmapFactory.decodeFile(file, options) and setting the Options.outHeight and Options.outWidth values manually to 800 and 533, but it doesn't work that way.
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Jul 14, 2010
I've tried downloading/transferring several files to my incredible over 3g. Tried downloading a couple times through the stock browser and also i've tried downloading through dropbox but every time the download gets randomly interrupted sometime between when 20mb - 100mb is done. I am not getting any calls or texts or anything that would interrupt it - it seems like the phone is going to sleep in the middle of the download or something. The files I am trying to transfer are approx 200mb .MP4 files and .MP3 files. Anyone know how to fix this problem and/or know of an app that will let you download or transfer large files from my home computer or from HTTP through my web host? On my BB Storm I had to use opera browser to download large files so maybe a different browser would work?
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Aug 14, 2009
Is it a problem that i put 17 Mb database to /data/data or should i put it to /sdcard?
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Mar 16, 2010
I need to send files as large as 80 MB, but usually in the 15-25 MB several times every day. I use YouSendit, Megaupload and the like on my laptop. Would be a HUGE help if I could simultaneously upload from my Android phone. It has to be able to handle a folder. Basically, a folder full of pictures.
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Dec 10, 2009
My application needs to intensively manipulate (read-write) on some structured text data.The size of the data is significant 1Mb. And there is initial data available for the user to start with.My idea is to put this data as a file in the .apk. Then, on initial application launch to read this data and populate Android SQLite database with it. Then just work with this database. But after the database is populated the data file is no longer needed. And I'd like to remove it to free some memory. Alternate approach is to work with this data file instead of SQLite database. But I assume SQLite would work a magnitude faster then i/o on my data file..
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May 30, 2010
when i download large data from website, i got this error information:
I/global (20094): Default buffer size used in BufferedInputStream constructor.
It would be better to be explicit if an 8k buffer is required.
D/dalvikvm(20094): GC freed 6153 objects / 3650840 bytes in 335ms
I/dalvikvm-heap(20094): Forcing collection of SoftReferences for 3599051-byte al
location
D/dalvikvm(20094): GC freed 320 objects / 11400 bytes in 144ms
E/dalvikvm-heap(20094): Out of memory on a 3599051-byte allocation.
I/dalvikvm(20094): "Thread-9" prio=5 tid=17 RUNNABLE
I/dalvikvm(20094): | group="main" sCount=0 dsCount=0 s=0 obj=0x439b9480
I/dalvikvm(20094): | sysTid=25762 nice=0 sched=0/0 handle=4065496
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May 12, 2012
How to download large files over 100MB by phone.
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Apr 28, 2009
I need to post some files on my server, it works fine for small files like 1mb but when i try for more than 4 mb ; it force close because of memory overload.
Have a look on my code below:
CODE:.................
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Oct 7, 2010
Presently am displaying html file in web view and my emulator size 1024*600. If the html file is large then user is scrolling down to see bottom part of the html. I Need to break these html file in equal parts so that it fits exactly in my screen size. I don't want User to Scroll Down but load remaining part (next page) next time.
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Mar 12, 2010
I have a class that extends View. I override the onDraw method and allow the user to draw on the screen. I am at the point where I want to save this view as an image. I Can use buildDrawingCache and getDrawingCache to create a bitmap that I can write to the SD card. However, the image is not good quality at a large size, it has jagged edges. Since I have a View and I use Paths I can transform all by drawing to a bigger size. I just don't know how to make the Canvas bigger so when I call getDrawingCache it doesn't crop all the paths I am just transformed. What is happening is I transform all my paths but when I write the Bitmap to file I am only getting the "viewport" of the actual screen size. I want something much bigger.
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May 28, 2010
I guess many people already read this article:
Using your own SQLite database in Android applications: http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/comment-page-2/#comment-12368
However it's keep bringing IOException at
CODE:.............
I'am trying to use a large DB file. It's as big as >8MB. I built it using sqlite3 in Mac OS X, inserted UTF-8 encoded strings (for I am using Korean), added android_meta table with ko_KR as locale, as instructed above.
However, When I debug, it keeps showing IOException at
CODE:..............
I suspect it's caused by trying to read a big file. If not, I have no clue why.
I tested the same code using much smaller text file, and it worked fine.
Can anyone help me out on this? I've searched many places, but no place gave me the clear answer, or good solution. Good meaning efficient or easy.
I will try use BufferedInput(Output)Stream, but if the simpler one cannot work, I don't think this will work either.
Can anyone explain the fundamental limits in file input/output in Android, and the right way around it, possibly?
WITH MORE DETAIL:
CODE:...............
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Oct 16, 2010
Well, I am sure that at some point in time you all have sent a video but I am trying to figure out why I can't send videos. Last night, I was performing at a night club and I wanted to send the videos to friends and what not so they can hear our singing. However, the video clips are anywhere from 8-20 seconds long and they are not in HD quality but 3gp. Yet it tells me the message can't be attached because it's too large.
Today I had a show, and my brother recorded me and I wanted to send the video out and it still says the same thing. Is there anything I can do? I love At & T but I am wondering does this have anything to do with their Data cap because when I had my Droid X and Incredible on Verizon. I was able to send videos up to 30 seconds long to phones via MMS but I can't send videos on my Captivate. I couldn't send videos either on the Xperia X10, I had, the aria I had, and now the backflip. (I am just using it because I love motoblur for the social networking, not the phone).
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Oct 23, 2009
I want make it support multiple screens(small,normal and large).I am 100% sure the all of layouts are working perfectly now, but large screen,the problem is that all XML files of layouts in layout-large can't load,The platform always load default XML file(these are under layout folder) at large screen environment.
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Jan 27, 2010
In Reference to this android file download problem http://stackoverflow.com/questions/576513/android-download-binary-file-problems
Can anyone explain what does this line mean in the code FileOutputStream f = new FileOutputStream(new File(root,"Video.mp4")); And what does it mean by the parameter root within the File(). Do I need to specify the root path to save the file? if it is the case then how do we specify the root path in android. Code...
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Feb 22, 2010
My application uses a single activity to switch between different views. I premise I'm loading a good amount of bitmaps in one of this view (say the gamescreen view) constructor but I recycle everything on the onDetachedFromWindow method.All the Bitmaps are static and most of them loaded with BitmapFactory. decodeResource method.Furthermore I'm using a gallery wich content is a simple layout with eight imagebuttons.I know all the complications using this widget and all the risks of using static bitmaps, but, I guess my problem does not entail them because my application is running well if I try to switch between these two view (and I've tried to do it about 30 times without crashes!!!) but when I pause and resume the application two times (pause->resume->pause->resume) I run out of memory, and often without the crash message (it just stays on the actual view).
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Apr 24, 2009
I am stuck.My main activity creates and starts a SurfaceView.My app needs to access a listview via the options menu to change properties of the items shown in the view.Two strange things occur:
1.) When I scroll the listview quickly, the list sometimes gets farklempt.Words overlap each other.
2.) When I select the item and the app returns to the main activity, the thread is no longer alive.
If someone out there can offer help I will post the code.This will take a little effort.My code is loosely based upon LunarLander and the GLSurfaceView examples.If there is a good example (more recent example) someone can point me to, that would be boss.
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Mar 5, 2010
I have a notification in the status bar for my app.The problem with this is that when you press the home button from the app (pushing it to the background) then press on the notification in the list accessed from the status bar, it starts a fresh copy of the activity. All I want to do is resume the app (like when you longpress the home button and press on the app's icon). Is there a way of creating an Intent to do this?
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Nov 17, 2009
We are developing an application that needs to suspend and resume threads like a debugger (meaning in a non-safe way like Object.wait() and Object.notify()).In the Java SDK the methods Thread.suspend() and Thread.resume() are deprecated but we can still use them. Also there is the Java debugger API which allows one to do that if you connect to the VM as a debugger. Is there some API for android we can use? Is there a published Java Debugger API we can apply for Android?
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Apr 7, 2010
I'm having some difficulty figuring out the best ways to pause and resume my application. Is there any comprehensive tutorial or something similar that would help me make sure that I'm not missing any important steps?Mostly I'm just worried about not dealing with the memory being used by my application. There's a few apps I own that when you minimize them slow down the rest of the phone to a stand still and I want to make sure to avoid that.
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Sep 23, 2010
I am trying to solve an issue sort of similar to what was done here (link text)Except in my case where Activity A, started Activity B, started Activity C, when the user resumes the app after pressing the home button - I want C, the last Activity, to be displayed. Instead what is happening is I am back to A.Also on a side note I have discovered that even when I exit the application, if I hold down the Home button, my app is still listed as an active app even though in the LogCat I can see that it exited OK.Also, in case it matters, I did recently add android:launchMode ="singleTask" in order to make some notification logic work correctly. I was seeing the Home button behavior before that though.
Activity B actually has several Activities that it chooses from (it has a list of Intents) to display based on input it receives but launches them all the same way as Activty A launched B. Once the first Activity is displayed the user swipe the screen to navigate to the left or right screen. When the user swipes left or right, the current activity puts info in its return Intent that Activity B uses to display the next Activity. Also since logic outside of the user's control could prompt a change in the screen displayed, each Activty calls finish on itself in onStop to avoid back-button issues.
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Jul 28, 2009
I've run into a very strange problem regarding OpenGL texture outputs, which only occurs when the app is resumed (particularly when leaving after pressing Home, and going back into the app).I'm not sure how or why, but it appears to be that it's reading bitrate of the pixels incorrect, or something else entirely. Furthermore, this issue only occurs on the device itself (testing on my G1/Dream), not on the emulator.Code as well as example screenshots in the zip file show exactly what I'm talking about. And to completely replicate the issue I've included the 2D sprite object framework I've developed for OpenGL so the situation is exactly the same as what I've run across when developing my game, so if it's somehow an issue in my framework you may be able to spot it.
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Apr 7, 2009
I have two activities running: MainActivity and ChildActivity. Whenever the user clicks in the button in MainActivity, the ChildActivity is launched. What I want to do is this:When the active activity is the ChildActivity and the user clicks the home button then relaunch the application (like opening from the beginning), I want to see the ChildActivity instead of MainActivity that is launched. However; This is happening only when the user clicks from recent activities window. (the window opened when you long press the home button).I had some suggestions actually work arounds and I tried to manipulate onStart, onRestart, onResume, onStop, onDestroy events. But, they didn't fully solve the problem. There should be a smart way out there.
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Apr 7, 2009
I have two activities running: mainActivity and childActivity. Whenever the user clicks in the button in mainActivity, the childActivity is launched. What I want to do is this:When the active activity is the childActivity and the user clicks the home button then relaunch the application, I want to see the childActivity instead of mainActivity that is launched.I had some suggestions actually work arounds. I tried to manipulate onStart, onRestart, onResume, onStop, onDestroy events. But, they didn't fully solve the problem.
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Jan 20, 2010
I have one simple question regarding Java TimerTask. How do I pause/resume two TimerTask tasks based on a certain condition? For example I have two timers that run between each other. When a certain condition has been met inside the task of first timer, the first timer stops and starts the second timer, and the same thing happens when a certain condition has been met inside the task of second timer.how do I pause timer1 while running timer2 and vice versa while timer2 is running? Performance and timing is my main concern as this needs to be implemented inside another running thread. By the way I am trying to implement these concurrent timers on Android.
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Oct 2, 2010
Can someone please tell me where I'm going wrong with this piece of code? Basically I want the app to download a .png file, display it to the user and also save it to the sd card for future reference. It seems to be all going fine until the while ((len = webstream.read(buffer)) > 0) part; as the debugger doesn't reach the breakpoint I've put in here, and I have a directory of empty .png files. I have the WRITE_EXTERNAL_STORAGE permission declared in my Manifest.......
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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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