Bitmap轉String類型

 private Bitmap temBitmap;
 convertIconToString(temBitmap) 

public static String convertIconToString(Bitmap bitmap) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();// outputstream
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
    byte[] appicon = baos.toByteArray();// 轉爲byte數組
 String     img = Base64.encodeToString(appicon, Base64.DEFAULT);
    return img;
}