Gson 解析数据问题！！！求解决阿！！

Untouchable- 2013-12-13 10:09:01



package com.example.tes;



import java.util.ArrayList;



import com.google.gson.Gson;

import com.google.gson.reflect.TypeToken;



import android.os.Bundle;

import android.app.Activity;



public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        User user = new User();

        user.setUserId(001);

        user.setUsername("abc");

        

        ArrayList<User> data = new ArrayList<User>();

        data.add(user);

        data.add(user);

        Gson gson = new Gson();

        String json = gson.toJson(data);

        

        System.out.println(json);

        

//        Type lisType = new TypeToken<ArrayList<User>>(){}.getType();

//        ArrayList<User> list = gson.fromJson(json,lisType);

        

        ArrayList<User> list = getList(json, User.class);

        

        

        

        System.out.println(list.get(0).getUserId());

        

        

        

    }





    public static <T> ArrayList<T> getList(String json, Class<T> cls) {

        ArrayList<T> list = new ArrayList<T>();

        try {

            Gson gson = new Gson();

            list = gson.fromJson(json,new TypeToken<ArrayList<T>>(){}.getType());

            

        } catch (Exception e) {

            e.printStackTrace();

        }

        return list;

    }

   



}

运行后这里出错 System.out.println(list.get(0).getUserId());

12-13 12:50:45.431: I/System.out(1520): [{"username":"abc","userId":1},{"username":"abc","userId":1}]
12-13 12:50:45.451: D/AndroidRuntime(1520): Shutting down VM
12-13 12:50:45.451: W/dalvikvm(1520): threadid=1: thread exiting with uncaught exception (group=0x40015560)
12-13 12:50:45.461: E/AndroidRuntime(1520): FATAL EXCEPTION: main
12-13 12:50:45.461: E/AndroidRuntime(1520): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tes/com.example.tes.MainActivity}: java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.os.Handler.dispatchMessage(Handler.java:99)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.os.Looper.loop(Looper.java:123)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-13 12:50:45.461: E/AndroidRuntime(1520): at java.lang.reflect.Method.invokeNative(Native Method)
12-13 12:50:45.461: E/AndroidRuntime(1520): at java.lang.reflect.Method.invoke(Method.java:507)
12-13 12:50:45.461: E/AndroidRuntime(1520): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-13 12:50:45.461: E/AndroidRuntime(1520): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-13 12:50:45.461: E/AndroidRuntime(1520): at dalvik.system.NativeStart.main(Native Method)
12-13 12:50:45.461: E/AndroidRuntime(1520): Caused by: java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap
12-13 12:50:45.461: E/AndroidRuntime(1520): at com.example.tes.MainActivity.onCreate(MainActivity.java:36)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-13 12:50:45.461: E/AndroidRuntime(1520): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-13 12:50:45.461: E/AndroidRuntime(1520): ... 11 more

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