Android授权登陆微信 status -400 app

05-07 10:31:20.750 3646-3664/? E/NetTool: httpGet fail, status code = 400
05-07 10:31:20.750 3646-3664/? W/System.err: java.lang.NullPointerException
at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
at org.json.JSONTokener.nextValue(JSONTokener.java:94)
at org.json.JSONObject.<init>(JSONObject.java:155)
at org.json.JSONObject.<init>(JSONObject.java:172)
at io.dcloud.common.util.JSONUtil.createJSONObject(JSONUtil.java:132)
at io.dcloud.feature.oauth.weixin.WeiXinOAuthService.b(WeiXinOAuthService.java:218)
at io.dcloud.feature.oauth.weixin.WeiXinOAuthService.i(WeiXinOAuthService.java:37)
at io.dcloud.feature.oauth.weixin.WeiXinOAuthService$2.run(WeiXinOAuthService.java:205)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)