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POAndroid - BitmapFactory.decodeByteArray - OutOfMemoryError (OOM)
 

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    <p>I have read 100s of article about the OOM problem. Most are in regard to large bitmaps. I am doing a mapping application where we download <code>256x256</code> weather overlay tiles. Most are totally transparent and very small. I just got a crash on a bitmap stream that was 442 Bytes long while calling <code>BitmapFactory.decodeByteArray(....).</code> </p> <p>The Exception states:</p> <pre><code>java.lang.OutOfMemoryError: bitmap size exceeds VM budget(Heap Size=9415KB, Allocated=5192KB, Bitmap Size=23671KB) </code></pre> <p>The code is:</p> <pre><code>protected Bitmap retrieveImageData() throws IOException { URL url = new URL(imageUrl); InputStream in = null; OutputStream out = null; HttpURLConnection connection = (HttpURLConnection) url.openConnection(); // determine the image size and allocate a buffer int fileSize = connection.getContentLength(); if (fileSize &lt; 0) { return null; } byte[] imageData = new byte[fileSize]; // download the file //Log.d(LOG_TAG, "fetching image " + imageUrl + " (" + fileSize + ")"); BufferedInputStream istream = new BufferedInputStream(connection.getInputStream()); int bytesRead = 0; int offset = 0; while (bytesRead != -1 &amp;&amp; offset &lt; fileSize) { bytesRead = istream.read(imageData, offset, fileSize - offset); offset += bytesRead; } // clean up istream.close(); connection.disconnect(); Bitmap bitmap = null; try { bitmap = BitmapFactory.decodeByteArray(imageData, 0, bytesRead); } catch (OutOfMemoryError e) { Log.e("Map", "Tile Loader (241) Out Of Memory Error " + e.getLocalizedMessage()); System.gc(); } return bitmap; } </code></pre> <p>Here is what I see in the debugger:</p> <pre><code>bytesRead = 442 </code></pre> <p>So the Bitmap data is 442 Bytes. Why would it be trying to create a 23671KB Bitmap and running out of memory?</p>
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    1. USBob Keathley
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    1. COThings to watch out that some OOM doesn't caused necessarily by the page that is triggering the error. At times, the OOM is triggered by accumulation from previous activities/bugs that get triggered by Bitmap manipulation by chance. We should look the app as a whole instead of just the place that triggered the OOM. A recent SO question that I just answered illustrated this scenario http://stackoverflow.com/questions/7136198/android-many-outofmemoryerror-exceptions-only-on-single-activity-with-mapview/7154643#7154643 where the OOM is not necessarily caused by the Activity that threw the error.
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    2. COThere are already many answers related to this question on SO, here is one of the solution that should work for you. [Memory exceeds](http://stackoverflow.com/questions/477572/android-strange-out-of-memory-issue/823966#823966) **UPDATED:** Another nice answer is here, [Memory Leaks](http://mobi-solutions.blogspot.com/2010/08/how-to-if-you-want-to-create-and.html)
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      1. USLalit Poptani
 

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