[Android-JSON] Avoid No value exception when service does not return a specific value in json reponse

Normal way to get string value from a json object would be :

myJsonObject.getString(KEY_CONSTANT)

well, sometimes this way does not fit. When you don’t know for sure that your service you are requesting is always stable. It may not return some keys for you, and oops you got 

JSONException No value for “missing key”

Here we may need help from other options.

optString(KEY) AND optString(KEY, Fallback_value)

 

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