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    <p>In the Android version, you should close <code>bos</code> <em>after</em> you close <code>gz</code>.</p> <p>Also, this line in <code>compressString</code> may give you problems:</p> <pre><code>byte b[] = str.getBytes(); </code></pre> <p>That will convert the characters to bytes using the default encoding on the device, which is almost certainly not UTF-8. The .NET version, on the other hand, is using UTF8. In Android, try this instead:</p> <pre><code>byte b[] = str.getBytes("UTF-8"); </code></pre> <p>EDIT: On further looking at your code, I suggest that you rewrite it like this:</p> <pre><code>byte b[] = str.getBytes("UTF-8"); GZIPOutputStream gz = new GZIPOutputStream(bos); gz.write(b, 0, b.length); gz.finish(); gz.close(); bos.close(); </code></pre> <p>The changes are: use UTF-8 to encode characters; use the default internal buffer size for the GZIPOutputStream; call <code>gz.close()</code> before calling <code>bos.close()</code> (the latter probably isn't even needed); and call <code>gz.finish()</code> before calling <code>gz.close()</code>.</p> <p>EDIT 2:</p> <p>Okay, I should have realized before what's going on. The GZIPOutputStream class is, in my opinion, a stupid design. It has no way to define the compression you want and the default compression is set to none. You need to subclass it and override the default compression. The easiest way is to do this:</p> <pre><code>GZIPOutputStream gz = new GZIPOutputStream(bos) { { def.setLevel(Deflater.BEST_COMPRESSION); } }; </code></pre> <p>That will reset the internal deflator that GZIP uses to give the best compression. (By the way, in case you aren't familiar with it, the syntax I'm using here is called an <a href="http://download.oracle.com/javase/tutorial/java/javaOO/initial.html" rel="nofollow">instance initializer block</a>.)</p>
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    1. POWhy the result of GZip algorithm is not same in Android and .Net?
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    1. COI tested your solution and it was not efficient unfortunately. Nothing changed.
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    2. COI've updated my answer.
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    3. COI tested it again. Nothing changed. I got "H4sIAAAAAAAAAMtIzcnJBwCGphA2BQAAAA==" again
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