在我们经常应用开发中，经常用到将drawable和string相互转化。注意这情况最好用于小图片入icon等。

public synchronized Drawable byteToDrawable(String icon) {         		byte[] img=Base64.decode(icon.getBytes(), Base64.DEFAULT);		Bitmap bitmap;          if (img != null) {                              bitmap = BitmapFactory.decodeByteArray(img,0, img.length);              @SuppressWarnings("deprecation")			Drawable drawable = new BitmapDrawable(bitmap);                            return drawable;          }          return null;        }	public  synchronized  String drawableToByte(Drawable drawable) {                  if (drawable != null) {              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);              drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),                      drawable.getIntrinsicHeight());              drawable.draw(canvas);              int size = bitmap.getWidth() * bitmap.getHeight() * 4;                        // 创建一个字节数组输出流,流的大小为size              ByteArrayOutputStream baos = new ByteArrayOutputStream(size);              // 设置位图的压缩格式，质量为100%，并放入字节数组输出流中              bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);              // 将字节数组输出流转化为字节数组byte[]              byte[] imagedata = baos.toByteArray();                         String icon= Base64.encodeToString(imagedata, Base64.DEFAULT);            return icon;          }          return null;      }

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