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PODecoding bitmaps in Android with the right size
 

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    <p>I decode bitmaps from the SD card using <code>BitmapFactory.decodeFile</code>. Sometimes the bitmaps are bigger than what the application needs or that the heap allows, so I use <code>BitmapFactory.Options.inSampleSize</code> to request a subsampled (smaller) bitmap.</p> <p>The problem is that the platform does not enforce the exact value of inSampleSize, and I sometimes end up with a bitmap either too small, or still too big for the available memory. </p> <p>From <a href="http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inSampleSize" rel="noreferrer">http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inSampleSize</a>:</p> <blockquote> <p>Note: the decoder will try to fulfill this request, but the resulting bitmap may have different dimensions that precisely what has been requested. Also, powers of 2 are often faster/easier for the decoder to honor.</p> </blockquote> <p>How should I decode bitmaps from the SD card to get a bitmap of the exact size I need while consuming as little memory as possible to decode it? </p> <p><strong>Edit:</strong></p> <p>Current source code:</p> <pre><code>BitmapFactory.Options bounds = new BitmapFactory.Options(); this.bounds.inJustDecodeBounds = true; BitmapFactory.decodeFile(filePath, bounds); if (bounds.outWidth == -1) { // TODO: Error } int width = bounds.outWidth; int height = bounds.outHeight; boolean withinBounds = width &lt;= maxWidth &amp;&amp; height &lt;= maxHeight; if (!withinBounds) { int newWidth = calculateNewWidth(int width, int height); float sampleSizeF = (float) width / (float) newWidth; int sampleSize = Math.round(sampleSizeF); BitmapFactory.Options resample = new BitmapFactory.Options(); resample.inSampleSize = sampleSize; bitmap = BitmapFactory.decodeFile(filePath, resample); } </code></pre>
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    1. COAre you using only powers of 2? I can completely understand why something like this would prefer that, but I'm not sure I've ever seen an API reference like that - "we'll try to give you what you asked for, but it might just be something else entirely".
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    2. COYou also might want to exlicity set the outWidth and outHeight properties of your bitmap, in order to control the size.
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    3. COI'm not using powers of 2. Powers of two are too limiting and the resulting bitmaps are either too small or too big. Maybe I should be using another API?
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