Android Raw to BMP

Android RAW format to BMP image

Raw is stored as bare data, and it needs to be converted into an RGBA mode to display it. which

8-bit raw: four-bit rgba to represent a grayscale;

24-bit raw: three-bit RGB is the same, A (Alpha) is represented by 0XFF.

Bitmap.config Enumeration Description:

　　The higher the number of bitmap bits, the more color information they can store, and the more realistic the image will be.

• Alpha_8 represents a 8-bit alpha bitmap
• argb_4444 represents a 16-bit ARGB bitmap
• argb_8888 represents a 32-bit ARGB bitmap
• rgb_565 represents a 8-bit RGB bitmap

The implementation is as follows :

3 ImportJava.io.ByteArrayOutputStream;4 Importjava.io.IOException;5 ImportJava.io.InputStream;6 ImportJava.nio.ByteBuffer;7 8 ImportAndroid.graphics.Bitmap;9 Ten /** One * Raw Turn bitmap A  *  -  * @authorChenrui -  *  the  */ -  Public classRawtobitmap - { -     /** + * Reading an array from the stream -      *  +      * @paramStream A * Input Stream at      * @return -      */ -      Public Static byte[] Readbytearrayformstream (InputStream stream) -     { -         Try -         { inBytearrayoutputstream OutStream =NewBytearrayoutputstream (); -             intLen = 0; to             byte[] tmp =New byte[1024]; +              while(len = stream.read (tmp))! =-1) -             { theOutstream.write (TMP, 0, Len); *             } $             Panax Notoginseng             byte[] data =Outstream.tobytearray (); -              the             returndata; +         } A         Catch(IOException e) the         { + e.printstacktrace (); -             return New byte[0]; $         } $     } -      -     /** the * 8-bit grayscale turn bitmap -      * Wuyi * Image width must be divisible by 4 the      *  -      * @paramData Wu * Bare Data -      * @paramwidth About * Image Width $      * @paramHeight - * Image Height -      * @return -      */ A      Public StaticBitmap Convert8bit (byte[] Data,intWidthintheight) +     { the         byte[] Bits =New byte[Data.length * 4];//RGBA Array -          $         inti; the          for(i = 0; i < data.length; i++) the         { the             //principle: 4 bytes represents a grayscale, then RGB = grayscale value, the last alpha = 0xFF; theBits[i * 4] = bits[i * 4 + 1] = bits[i * 4 + 2] =Data[i]; -Bits[i * 4 + 3] =-1;//0xFF in         } the          the         //Bitmap.Config.ARGB_8888: Image mode is 8 bits AboutBitmap BMP =Bitmap the . CreateBitmap (width, height, Bitmap.Config.ARGB_8888); the Bmp.copypixelsfrombuffer (Bytebuffer.wrap (Bits)); the          +         returnbmp; -     } the     Bayi     /** the * 24-bit grayscale turn bitmap the      *  - * Image width must be divisible by 4 -      *  the      * @paramData the * Bare Data the      * @paramwidth the * Image Width -      * @paramHeight the * Image Height the      * @return the      */94      Public StaticBitmap Convert24bit (byte[] Data,intWidthintheight) the     { the         byte[] Bits =New byte[Data.length * 4];//RGBA Array the         98         inti; About          -         //DATA.LENGTH/3 represents a group of 3 bits101          for(i = 0; i < DATA.LENGTH/3; i++)102         {103             //principle: 24 bits are colored, so to copy 3 bits, the last one alpha = 0xFF;104Bits[i * 4] = Data[i * 3]; theBits[i * 4 + 1] = data[i * 3 + 1];106Bits[i * 4 + 2] = data[i * 3 + 2];107Bits[i * 4 + 3] = 1;108         }109          the         //Bitmap.Config.ARGB_8888: Image mode is 8 bits111Bitmap BMP =Bitmap the . CreateBitmap (width, height, Bitmap.Config.ARGB_8888);113 Bmp.copypixelsfrombuffer (Bytebuffer.wrap (Bits)); the          the         returnbmp; the     }117     118     /**119 * 8-bit grayscale turn bitmap -      * 121      * @paramStream122 * Input Stream123      * @paramwidth124 * Image Width the      * @paramHeight126 * Image Height127      * @return -      */129      Public StaticBitmap Convert8bit (InputStream stream,intWidthintheight) the     {131         returnconvert8bit (Readbytearrayformstream (stream), width, height); the     }133     134     /**135 * 24-bit grayscale turn bitmap136      * 137      * @paramData138 * Input Stream139      * @paramwidth $ * Image Width141      * @paramHeight142 * Image Height143      * @return144      */145      Public StaticBitmap Convert24bit (InputStream stream,intWidthintheight)146     {147         returnconvert24bit (Readbytearrayformstream (stream), width, height);148     }149}

The width and height must match correctly when displayed.

Imageview1.setimagebitmap (Rawtobitmap.convert8bit (Getassets (). Open ("8bit.raw"), 512, 512));

Android Raw to BMP