Question

List<Map<String,Object>> list 增加map对象就出错

package com.example.ppp;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

public class MainActivity extends Activity {

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv =(TextView)findViewById(R.id.haha);
String test="[{\"detail\":\"好好吃\",\"names\":\"蛋糕\"},{\"detail\":\"礼轻情重\",\"names\":\"礼物\"}]";
Gson gson = new Gson();
List<Map<String,Object>> list2 =gson.fromJson(test, new TypeToken<List<Map<String,Object>>>(){}.getType());
List<Map<String,Object>> list = null;

Map<String, Object> map = new HashMap<String, Object>();

map.put("haha", "haha");
map.put("names", list2.get(0).get("names").toString());
map.put("detail",list2.get(0).get("detail").toString());
//只要加上这句话就会跳出并且报错。为什么！！！！！！！！！！！！！
list.add(map);
}
}

Answer 1

忘了list的初始化和哈希表的释用了，没法帮你，回复好像也有分，路过而已