Why is my Java bitmap buffer filled with zeros after using copyPixelsToBuffer?

Java Bitmap to Byte Array: Resolving Buffer Issue

In an attempt to convert a Java bitmap to a byte array, some users encounter a peculiar problem where the buffer contains only zeros after copying the pixels using the copyPixelsToBuffer method. Despite the immutability of the camera-returned bitmap, this unexpected outcome raises concerns about the code's accuracy.

To address this issue, consider employing an alternative approach:

<code class="java">Bitmap bmp = intent.getExtras().get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
bmp.recycle();</code>

In this revised code, instead of copying the pixels directly to a buffer, we use ByteArrayOutputStream to compress the bitmap into a PNG format (with a quality level of 100). This process generates a byte array containing the bitmap's data. Additionally, the code releases the bitmap's resources by calling the recycle method to prevent memory leaks.

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