Android converts the picture into a byte stream, and further converts it into String type data

This function is realized by writing a sub-function, the specific code is as follows:

/**
     * 将图片转换成字节流，并进一步转换成String类型的数据
     */
    public static String putImageToShare(Context mContext, ImageView imageView) {
    
    
        BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
        Bitmap bitmap = drawable.getBitmap();
        ByteArrayOutputStream byStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 80, byStream);
        byte[] byteArray = byStream.toByteArray();
        String imgString = new String(Base64.encodeToString(byteArray, Base64.DEFAULT));
        return imgString;
    }

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