学步园

 转自：http://bingtian.iteye.com/blog/642128

从view中获得imageview   获得drawable     

	ImageView iv=(ImageView) view.findViewById(R.id.la_image);
	Drawable drawable=iv.getDrawable();

ava.lang.Object
   ↳ 	android.graphics.drawable.Drawable
  	   ↳ 	android.graphics.drawable.BitmapDrawable

drawable   转 bitmap

	BitmapDrawable bd=(BitmapDrawable) drawable;
	Bitmap bm=bd.getBitmap();

bitma转成byte[]

	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
	byte[] by=baos.toByteArray();

byte[]  转成bitmap

Bitmap bm=BitmapFactory.decodeByteArray(b, 0, b.length)

bitmap 转成drawable

Drawable drawable = new BitmapDrawable(bitmap);