Android Intent传值问题汇总

Android Parcelable序列化自定义类集合在Activity间传递

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参考链接  https://blog.csdn.net/haishizi1/article/details/84420576

    // 将Map Key 转化为List    
        List<String> mapKeyList = new ArrayList<String>(map.keySet());  
        System.out.println("mapKeyList:"+mapKeyList);

  // 将Map value转化为List    
        List<String> mapValuesList = new ArrayList<String>(map.values());  
        System.out.println("mapValuesList:"+mapValuesList);

Intent 传递map 利用gson 将map转为string

private String seven() {
    Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
    Map<String, String> map = new HashMap<String, String>();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");
 
    return gson2.toJson(map);
}

获取string ，转为map对象

Type type = new TypeToken<Map<String, String>>() {}.getType();

Map<String, String> map2 = gson2.fromJson(jsonString, type);

 

Intent 传递List ,对象实现Parcelable接口

intent.putExtra("change_data", (ArrayList<? extends Parcelable>) listData);

获取list对象