转换位图的ByteArray，反之亦然 [英] Convert Bitmap to ByteArray and vice versa

问题描述

在我的Andr​​oid应用程序，我想转换形象，从相机拍摄的，以字节数组，转换回位图来查看一个图像视图。我可以通过Bitmap.com preSS轻松地做到这一点。但我想这样做没有Bitmap.com preSS。问题是，我收到白线（较差的图像每次（线））

 位图您好; //图像从摄像机里
                        ByteBuffer的缓冲= ByteBuffer.allocate（hello.getByteCount（））;
                        hello.copyPixelsToBuffer（缓冲液）;
                        字节[] = bytes1 buffer.array（）;
                        字节[]位=新的字节[bytes1.length * 4];
                        INT I;
                   对于（i = 0; I＆LT; bytes1.length;我++）
                {
                    位[我* 4] =
                        位[我* 4 + 1] =
                        位[我* 4 + 2] =（字节）〜bytes1 [I]; //反转源位
                    位[我* 4 + 3] = -1; // 0xFF的，这是阿尔法。
                }                位图bmimage = Bitmap.createBitmap（360248，Bitmap.Config.ARGB_8888）;
                bmimage.copyPixelsFromBuffer（ByteBuffer.wrap（位））;
                imageView11.setImageBitmap（bmimage）;
 

解决方案

位图的字节数组：

  ByteArrayOutputStream流=新ByteArrayOutputStream（）;
bmp.com preSS（Bitmap.Com pressFormat.PNG，100，流）;
字节[] = imageBytes stream.toByteArray（）;
 

或

 字节INT = bitmap.getByteCount（）;
ByteBuffer的缓冲= ByteBuffer.allocate（字节）;
bitmap.copyPixelsToBuffer（缓冲液）;
byte []数组= buffer.array（）;
 

字节数组位图：

 的InputStream的InputStream =新ByteArrayInputStream进行（字节）;
  BitmapFactory.Options O =新BitmapFactory.Options（）;
  BitmapFactory.de codeStream（InputStream中，空，O）;
 

In my android application i want to convert image ,taken from camera, to byte array and convert back to bitmap to view in a image view. I can do it easily through Bitmap.compress. But i want to do it without Bitmap.compress. The problem is that i am getting white lines (poor images every time(lines) )

                        Bitmap hello;    //image coming from camera
                        ByteBuffer buffer = ByteBuffer.allocate(hello.getByteCount()); 
                        hello.copyPixelsToBuffer(buffer);
                        byte[] bytes1 = buffer.array();
                        byte [] Bits = new byte[bytes1.length*4];
                        int i;
                   for(i=0;i<bytes1.length;i++)
                {
                    Bits[i*4] =
                        Bits[i*4+1] =
                        Bits[i*4+2] = (byte) ~bytes1[i]; //Invert the source bits
                    Bits[i*4+3] = -1;//0xff, that's the alpha.
                }

                Bitmap bmimage = Bitmap.createBitmap( 360,248, Bitmap.Config.ARGB_8888);
                bmimage.copyPixelsFromBuffer(ByteBuffer.wrap(Bits));
                imageView11.setImageBitmap(bmimage);

解决方案

Bitmap to byte array:

ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] imageBytes = stream.toByteArray();

or

int bytes = bitmap.getByteCount();
ByteBuffer buffer = ByteBuffer.allocate(bytes); 
bitmap.copyPixelsToBuffer(buffer); 
byte[] array = buffer.array();

byte array to Bitmap:

 InputStream inputStream = new ByteArrayInputStream(bytes);
  BitmapFactory.Options o = new BitmapFactory.Options();
  BitmapFactory.decodeStream(inputStream, null, o);

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