Convert raw Android image to png -

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on rooted android device, want take screenshot , convert raw format image png image save locally. far, managed access framebuffer, take screenshot , save raw image. problem when convert png format, image wrong.. bunch of white , grey lines. here's did: 

public void putrawimageinarray (byte [] array, file f ) throws ioexception{     @suppresswarnings("resource")      bufferedinputstream bufferedinputstream = new bufferedinputstream(new fileinputstream(f));   //the framebuffer raw image in file     bufferedinputstream.read(array, 0, array.length);//read file }   public void converttobitmap (byte [] rawarray) throws ioexception{             byte [] bits = new byte[rawarray.length*4];              int i;             for(i=0;i<rawarray.length;i++)             {                 bits[i*4] =                     bits[i*4+1] =                     bits[i*4+2] = (byte) ~rawarray[i];                  bits[i*4+3] = -1;//0xff, that's alpha.             }               bitmap bm = bitmap.createbitmap(w, h, bitmap.config.argb_8888);             bm.copypixelsfrombuffer(bytebuffer.wrap(bits));               file f = new file(environment.getexternalstoragedirectory(), "/pictures/picture.png");             f.createnewfile();             if (f.exists() == true) {                 f.delete();             } try{             outputstream fos=new fileoutputstream(f);             bm.compress(compressformat.png, 100, fos);             fos.close(); } catch (filenotfoundexception e) {     log.d(tag, "file not found: " + e.getmessage()); } catch (ioexception e) {     log.d(tag, "error accessing file: " + e.getmessage()); }

what doing wrong?

try removing 

    byte [] bits = new byte[rawarray.length*4];      int i;     for(i=0;i<rawarray.length;i++)     {         bits[i*4] =             bits[i*4+1] =             bits[i*4+2] = (byte) ~rawarray[i];          bits[i*4+3] = -1;//0xff, that's alpha.     }

and use rawarray directly

 bitmap bm = bitmap.createbitmap(w, h, bitmap.config.argb_8888);  bm.copypixelsfrombuffer(bytebuffer.wrap(rawarray));

and make sure color model using(bitmap.config.argb_8888) same color model of image data.


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