Org.json Jsonexception: what about no value for value

Use android studio To write APP Analyze the information returned from Alibaba cloud's Internet of things platform .

 

Sometimes I meet org.json.JSONException: No value for Value Error messages for

Where to look at this information ？

It's from android studio Of logcat Window view , When debugging, there will be a prompt in this window .

  The solution is ： Go to the Internet of things platform to check the equipment to be debugged , Whether the material model has data . If there is no data , Then let the device go online , Then send an attribute data . Or use the device simulator to report a data . Run it again android studio, You can find that the problem is eliminated .

  The reason for this problem is that the returned data is empty .

If your device defines many attributes , And when parsing , Parse each attribute , Then there is an attribute that has no value , Will be null , And think it's wrong .

So this time may report  org.json.JSONException: No value for XX abnormal .