Android Drawable 和String 相互转化

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;
    }