[摘要]本文是对Android -- Drawable && Bitmap的讲解，对学习Android编程技术有所帮助,与大家分享。

Bitmap转Drawable Bitmap bm=xxx; BitmapDrawable bd=new BitmapDrawable(bm);

因为BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。

Drawable转Bitmap Drawable d=xxx; BitmapDrawable bd = (BitmapDrawable) d; Bitmap bm = bd.getBitmap();

最终bm就是我们需要的Bitmap对象了。

从资源中获取Bitmap public static Bitmap getBitmapFromResources(Activity act, int resId) { Resources res = act.getResources(); return BitmapFactory.decodeResource(res, resId); } byte[] → Bitmap public static Bitmap convertBytes2Bimap(byte[] b) { if (b.length == 0) { return null; } return BitmapFactory.decodeByteArray(b, 0, b.length); } Bitmap → byte[] public static byte[] convertBitmap2Bytes(Bitmap bm) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } Drawable → Bitmap public static Bitmap convertDrawable2BitmapByCanvas(Drawable drawable) { Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight(),drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888: Bitmap.Config.RGB_565); Canvas canvas = new Canvas(bitmap); // canvas.setBitmap(bitmap); drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); drawable.draw(canvas); return bitmap; }