String url = "http://wxpay.weixin.qq.com/pub_v2/app/app_pay.php?plat=android";Button payBtn = (Button) findViewById(R.id.appay_btn);payBtn.setEnabled(false);Toast.makeText(PayActivity.this, "获取订单中...", Toast.LENGTH_SHORT).show();try{byte[] buf = Util.httpGet(url);if (buf != null && buf.length > 0) {String content = new String(buf);Log.e("get server pay params:",content);JSONObject json = new JSONObject(content); if(null != json && !json.has("retcode") ){PayReq req = new PayReq();//req.appId = "wxf8b4f85f3a794e77"; // 测试用appIdreq.appId = json.getString("appid");req.partnerId = json.getString("partnerid");req.prepayId = json.getString("prepayid");req.nonceStr = json.getString("noncestr");req.timeStamp = json.getString("timestamp");req.packageValue = json.getString("package");req.sign = json.getString("sign");req.extData = "app data"; // optionalToast.makeText(PayActivity.this, "正常调起支付", Toast.LENGTH_SHORT).show();// 在支付之前，如果应用没有注册到微信，应该先调用IWXMsg.registerApp将应用注册到微信api.sendReq(req);}else{Log.d("PAY_GET", "返回错误"+json.getString("retmsg"));Toast.makeText(PayActivity.this, "返回错误"+json.getString("retmsg"), Toast.LENGTH_SHORT).show();}}else{Log.d("PAY_GET", "服务器请求错误");Toast.makeText(PayActivity.this, "服务器请求错误", Toast.LENGTH_SHORT).show();}}catch(Exception e){Log.e("PAY_GET", "异常："+e.getMessage());Toast.makeText(PayActivity.this, "异常："+e.getMessage(), Toast.LENGTH_SHORT).show();}payBtn.setEnabled(true);

public static byte[] httpGet(final String url) { if (url == null || url.length() == 0) { Log.e(TAG, "httpGet, url is null"); return null; } HttpClient httpClient = getNewHttpClient(); HttpGet httpGet = new HttpGet(url); try { HttpResponse resp = httpClient.execute(httpGet); if (resp.getStatusLine().getStatusCode() != HttpStatus.SC_OK) { Log.e(TAG, "httpGet fail, status code = " + resp.getStatusLine().getStatusCode()); return null; } return EntityUtils.toByteArray(resp.getEntity()); } catch (Exception e) { Log.e(TAG, "httpGet exception, e = " + e.getMessage()); e.printStackTrace(); return null; } }