Gson deserialize null pointer in released apk

Question

I\'m writing an Android app need using gson to deserialize the json string:

{
    \"reply_code\": 001,
    \"userinfo\": {
        \"username\": \"002\",
            


        

Answer 1

You have ProGuard enabled in your release build type - minifyEnabled true. It obfuscates the code by changing class/variable names.

You should annotate your class properties, so Gson knows what to look for:

public class ReturnData {
    @SerializedName("reply_code")
    public String reply_code;
    @SerializedName("userinfo")
    public userinfo userinfo;
}

public class userinfo {
    @SerializedName("username")
    public String username;
    @SerializedName("userip")
    public String userip;
}

This way Gson won't look at the properties' names, but will look at @SerializedName annotation.