Gson 解析时候报错： Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $

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在使用Gson解析JSON时遇到了错误，错误信息提示在行1列2的位置预期是BEGIN_OBJECT，但实际上遇到了BEGIN_ARRAY。问题出在数据前后存在中括号。解决方法是简单地删除这些多余的中括号。


03-17 23:05:00.373 18335-18335/? E/AndroidRuntime: FATAL EXCEPTION: main
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime: Process: tech.androidstudio.jsongsondemo, PID: 18335
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{tech.androidstudio.jsongsondemo/tech.androidstudio.jsongsondemo.MainActivity}: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2314)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:148)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:135)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5310)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:  Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:879)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:844)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:793)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:765)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at tech.androidstudio.jsongsondemo.MainActivity.onCreate(MainActivity.java:54)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.Activity.performCreate(Activity.java:5953)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1128)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:148) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:135) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5310) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:  Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:388)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:209)
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:879) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:844) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:793) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.google.gson.Gson.fromJson(Gson.java:765) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at tech.androidstudio.jsongsondemo.MainActivity.onCreate(MainActivity.java:54) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.Activity.performCreate(Activity.java:5953) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1128) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.access$800(ActivityThread.java:148) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:102) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:135) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5310) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372) 
03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901) 

03-17 23:05:00.373 18335-18335/? E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696) 


原因是数据的前后多了[ ]中括号。

String gsonStr1= "[{name:'name0',age:0}]";

解决办法：

将前后的中括号去掉就好了。

//修改后{name:'name0',age:0}，要去掉前后的括号。
String gsonStr1= "{name:'name0',age:0}";


【bug解决】java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING
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