java - Android 中的 Json 文本到 RecyclerView

Question

我需要有关 RecyclerView 的帮助。我的 SQL 数据库中有一个 atring 数组，如下所示:

{"success":true,"0":{"order_number":"078","typ_first":"E3rft","typ_last":"Split","order_date_time":"2016-10-11 19:20:03"},"1":{"order_number":"166","typ_first":"E483f","typ_last":"Split_test","order_date_time":"2016-10-12 18:39:30"}}

在我的 RecyclerView 中，我有以下字段:

• 订单号
• typ_all(输入第一个和最后一个)
• 日期(只有日期，没有时间)

这就是我获取字符串数组的方式:

String plansData = plansPreferenceData.getString("plansPreferenceData", "");

这就是我将数据设置到 RecyclerView 的方法:

// Set plan data
Plans plan = new Plans("123", "E3rft Split", "11.10.2016");
// Add Object to list
planList.add(plan);

// Notify data changes
pAdapter.notifyDataSetChanged();

我的计划类(class):

public class Plans {
    private String planTitle, planType, planDate;

    public Plans(String planTitle, String planType, String planDate) {
        this.planTitle = planTitle;
        this.planType = planType;
        this.planDate = planDate;
    }

    public void setPlanTitle(String planTitle) {
        this.planTitle = planTitle;
    }

    public String getPlanTitle() {
        return planTitle;
    }

    public void setPlanType(String planType) {
        this.planType = planType;
    }

    public String getPlanType() {
        return planType;
    }

    public void setPlanDate(String planDate) {
        this.planDate = planDate;
    }

    public String getPlanDate() {
        return planDate;
    }
}

我的onCreateView:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_training, container, false);

    preparePlansData();

    return view;
}

我的preparePlansData():

private void preparePlansData() {

    // Set plan data
    Plans plan = new Plans("123", "fkfjfjeje", "21.04.1977");
    // Add Object to list
    planList.add(plan);

    plan = new Plans("test", "tttt", "22.01.2017");
    planList.add(plan);

    // Notify data changes
    pAdapter.notifyDataSetChanged();

}

我的问题是如何将字符串数组中的信息获取到我的适配器中？我还需要在添加之前格式化日期。感谢您的帮助!

Answer 1

在这里了解Gson:

http://guides.codepath.com/android/leveraging-the-gson-library

之后您将能够编写这样的代码:

 Type type = new TypeToken<Map<Integer, Plans>>(){}.getType();
 Map<Integer, Plans> myMap = gson.fromJson("your json from db", type); 

并在你的适配器中使用这个map.values()

您的Plans类应如下所示:

class Plans {
    String order_number;
    String typ_first;
    String typ_last;
    String order_date_time;
}

如果您想要其他字段名称，则必须使用@SerializedName注释

最后，你应该写这样的东西，(我不知道语法是否100%现在没有打开IDE):

private void preparePlansData() {
    String plansData = plansPreferenceData.getString("plansPreferenceData", "");
    Type type = new TypeToken<Map<Integer, Plans>>(){}.getType();
    Map<Integer, Plans> myMap = gson.fromJson(plansData, type); 
    planList.addAll(myMap.values());

    // Notify data changes
    pAdapter.notifyDataSetChanged();
}

并修改您的模型类:

public class Plans {
    @SerializedName("order_number")
    String planTitle;
    @SerializedName("typ_last") 
    String planType; 
    @SerializedName("order_date_time")  
    String planDate;
    ....

希望对你有帮助。