Android中Bitmap及Drawable转换

1.Drawable—>Bitmap Resources res=getResources(); Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.sample_0); 2.Bitmap---->Drawable Drawable drawable =new BitmapDrawable(bmp); 另外在网上搜了些，也不知到底谁是原创的，反正不是我 1、Drawable → Bitmap public static Bitmap drawableToBitmap(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; } 2、从资源中获取Bitmap Resources res=getResources(); Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic); 3、Bitmap → byte[] private byte[] Bitmap2Bytes(Bitmap bm){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } 4、 byte[] → Bitmap private Bitmap Bytes2Bimap(byte[] b){ if(b.length!=0){ return BitmapFactory.decodeByteArray(b, 0, b.length); } else { return null; } }