java - Android bitmap to ByteArray and vice versa returns null? -


i trying allocate direct bytebuffer java, fill bitmap , create bitmap buffer. result receive null. 

    bitmapfactory.options options = new bitmapfactory.options();     options.inpreferredconfig = bitmap.config.argb_8888;     mcurrentbitmap = bitmapfactory.decodefile(hardcodedpath, options);      // 4 - bytes count per pixel     bytescount = mcurrentbitmap.getwidth() * mcurrentbitmap.getheight() * 4;      pixels = bytebuffer.allocatedirect((int) bytescount);     mcurrentbitmap.copypixelstobuffer(this.pixels);      byte[] bitmapdata = new byte[pixels.remaining()];     pixels.get(bitmapdata);      bitmapfactory.options opt = new bitmapfactory.options();     opt.inpreferredconfig = bitmap.config.argb_8888;      bitmap newbitmap = bitmapfactory.decodebytearray(bitmapdata, 0, (int) bytescount, opt);

can me understand why newbitmap null?

decodebytearray() expects encoded bitmap data (png, jpeg, etc.), not simple rgb(a) byte array. want can use bitmap.setpixels(). first, create bitmap of right size/configuration (bitmap.create(width, height, bitmap.config.argb_8888) instance) call setpixels(bitmapdata, 0, width, 0, 0, width, height) on it.

since have bytebuffer can more calling bitmap.copypixelsfrombuffer(). setpixels(), create bitmap of right size first.


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