将 Java 位图转换为字节数组 [英] converting Java bitmap to byte array
本文介绍了将 Java 位图转换为字节数组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
Bitmap bmp = intent.getExtras().get("data");
int size = bmp.getRowBytes() * bmp.getHeight();
ByteBuffer b = ByteBuffer.allocate(size);
bmp.copyPixelsToBuffer(b);
byte[] bytes = new byte[size];
try {
b.get(bytes, 0, bytes.length);
} catch (BufferUnderflowException e) {
// always happens
}
// do something with byte[]
当我在调用 copyPixelsToBuffer
之后查看缓冲区时,字节都是 0...从相机返回的位图是不可变的...但这应该无关紧要,因为它正在执行复制.
When I look at the buffer after the call to copyPixelsToBuffer
the bytes are all 0... The bitmap returned from the camera is immutable... but that shouldn't matter since it's doing a copy.
这段代码可能有什么问题?
What could be wrong with this code?
推荐答案
试试这个:
Bitmap bmp = intent.getExtras().get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
bmp.recycle();
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