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1. java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
引入了相同的包名
2.Expected a string but was BEGIN_OBJECT at line 1 column 2 path $
不让retrofit2自动替我解析json
解决:将返回类型换成 JSONObject