What is the mistake in converting a byte array to bitmap in android? (the byte array is sent from a c/c++ server, android beeing the client) -

i'm developing android app sends it's accelerometer , gravity sensor data c/c++ server uses opengl library make 3d shape rotate on screen. want send android device "snapshots" opengl screen.

on c/c++ (server side ) :

//declarations     struct params {     unsigned char pic[4*256*256]; // 4 because of gl_rgba format     char* msg; }; params p;  // reading content of screen glreadpixels(0, 0, 256, 256, gl_rgba, gl_unsigned_byte, p.pic);  //sending data send(sconnect,(char*)p.pic,4*256*256,0); 

on android (client side) i'm trying read byte array , converting bitmap.

//declarations socket = new socket("192.168.1.101", 1234); dataoutputstream = new dataoutputstream(socket.getoutputstream()); private byte image[]=  new byte[4 * 256 * 256 ]; private int intimage[] = new int[4 * 256 * 256]; //read data sent server datainputstream.readfully(image, 0, 256 * 256 * 4); //       //transform byte array int array     // i'm doing byte & 0xff convert byte unsigned byte( java doesn't have unsigned           byte)     // i'm doing convert gl_rgba argb_8888     (int = 1; < image.length; = + 4) {         int j = - 1;         aux = (image[i + 3] & 0xff);         intimage[j + 3] = (int) (image[i + 2] & 0xff);         intimage[j + 2] = (int) (image[i + 1] & 0xff);         intimage[j + 1] = (int) (image[i] & 0xff);         intimage[j] = aux;  }   //creating bitmap:  bitmap bmp = bitmap.createbitmap(256, 256, config.argb_8888);  bmp.setpixels(intimage, 0, 256, 0, 0, 256, 256);   //creating image based on bitmap  imv = (imageview) findviewbyid(r.id.imageview1);  imv.setimagebitmap(bmp); 

in case output blank ( image transparent pixels)

if :

bmp = bitmapfactory.decodebytearray(image, 0,image.length); 

the bmp variable null.

any ideas of wrong?

i think have common endianness problem.

while using glreadpixels on little-endian or big-endian processor results different.

please notice java uses network byte order (big endian). same code written in c++ behaves different on powerpc, arm (big endian) , x86_64 (little endian).