【微信支付踩到的那些坑】1.Android 微信支付，body为中文字符，签名错误

<span style="font-size:14px;">private String genProductArgs() {
StringBuffer xml = new StringBuffer();

try {
String	nonceStr = genNonceStr();

xml.append("</xml>");
List<NameValuePair> packageParams = new LinkedList<NameValuePair>();
packageParams.add(new BasicNameValuePair("appid", Constants.APP_ID));
packageParams.add(new BasicNameValuePair("body", "测试"));
packageParams.add(new BasicNameValuePair("mch_id", Constants.MCH_ID));
packageParams.add(new BasicNameValuePair("nonce_str", nonceStr));
packageParams.add(new BasicNameValuePair("notify_url", "你的notify_url"));
//			packageParams.add(new BasicNameValuePair("out_trade_no",genOutTradNo()));
packageParams.add(new BasicNameValuePair("out_trade_no",ordercode));
packageParams.add(new BasicNameValuePair("spbill_create_ip","127.0.0.1"));
packageParams.add(new BasicNameValuePair("total_fee", price));
packageParams.add(new BasicNameValuePair("trade_type", "APP"));

String sign = genPackageSign(packageParams);
packageParams.add(new BasicNameValuePair("sign", sign));

String xmlstring =toXml(packageParams);

//改变拼接之后xml字符串格式  解决body为中文签名错误问题
return new String(xmlstring.toString().getBytes(), "ISO8859-1");

} catch (Exception e) {
Log.e("genProductArgs", "genProductArgs fail, ex = " + e.getMessage());
return null;
}

}</span>