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POHow to read base64 encoded picture from rails by android
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copied!<p>I want to send an base64 encoded picture from ruby on rails to android. Sending the data to rails included the picture encoding and decoding works, the data transfer from rails back to android works also, but I can't decode the picture, which was encoded by rails. I always get a NullpointerException at the following marked line:</p> <pre><code>imageOutFile = new FileOutputStream(file); byte[] bytes = Base64.decode(imageString, Base64.URL_SAFE); Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length); **bitmap.compress(Bitmap.CompressFormat.JPEG, 100, imageOutFile);** </code></pre> <p>The encoded string looks like the following (it's the shortest one):</p> <pre><code>_9j_4AAQSkZJRgABAQEASABIAAD_4Se-RXhpZgAASUkqAAgAAAALAA4BAgAUAAAAkgAAAA8BAgAUAAAApgAAABABAgAJAAAAugAAABIBAwABAAAAAQAAAA== </code></pre> <p>Another string is this:</p> <pre><code>_9j_4AAQSkZJRgABAQEAAQABAAD_2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH_2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH_wAARCAHgAoADASIAAhEBAxEB_8QAHAABAQEBAQEBAQEAAAAAAAAAAAoICQcGAgED_8QARRAAAQIBCAYIBAQEBwACAwAAAAYHBQEECAkZOIe3AxQVFqfWAhhWV1iWl9cXaNXnERIjJRM2VfAkJic1UZSkUmchMjf_xAAXAQEBAQEAAAAAAAAAAAAAAAAACQEH_8QAMxEBAAAEAwUGBQMFAAAAAAAAAAEGB1YCGJYDcbHV1ggXQUam8AURFjFRYaG1IYGRxcb_2gAMAwEAAhEDEQA_AIPwAAAAAAACo6rguPM3iPm-vCXEqOq4LjzN4j5vrwDbQAAAAAAABLnWM33Hqw4yoQ5UYS51jN9x6sOMqEOBiMAAAAAAAAqOq4LjzN4j5vrwlxKjquC48zeI-b68A20AAAAAAAAS51jN9x6sOMqEOVGEudYzfcerDjKhDgYjAAAAAAAAKjquC48zeI-b68JcSo6rguPM3iPm-vANtAAAAAAAAEudYzfcerDjKhDlRhLnWM33Hqw4yoQ4GIwAAAAAAACo6rguPM3iPm-vCXEqOq4LjzN4j5vrwDbQAAAAAAABLnWM33Hqw4yoQ5UYS51jN9x6sOMqEOBiMAAAAAAAAqOq4LjzN4j5vrwlxKjquC48zeI-b68A20AAAAAAAAS51jN9x6sOMqEOVGEudYzfcerDjKhDgbYsbvmb4PfdIWN3zN8HvukdtABxLsbvmb4PfdIWN3zN8HvukdtABxLsbvmb4PfdIWN3zN8HvukdtABxLsbvmb4PfdId </code></pre> <p>In Logcat I get a message like this, after the failed decoding:</p> <pre><code>--- decoder->decode returned false </code></pre> <p>I encode the string with the following method and send the string with a json object to android. The picture was uploaded with the uploader of CarrierWave.</p> <pre><code>Base64.urlsafe_encode64(File.read("public#{picture_path.to_s}")) </code></pre>

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