[英]Json text to RecyclerView in Android
我的RecyclerView需要幫助。 我的SQL數據庫中有一個atring數組,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,我具有以下字段:
order_number
typ_all
(第一個和最后一個類型) date
(只有一個沒有時間的日期) 這是我獲取字符串數組的方式:
String plansData = plansPreferenceData.getString("plansPreferenceData", "");
這是我將數據設置到RecyclerView的方式:
// 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Plans
課程:
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();
}
我的問題是如何從字符串數組中獲取信息到適配器? 添加之前,我還需要格式化日期。 謝謝你的幫助!
在這里閱讀有關Gson的信息:
http://guides.codepath.com/android/leveraging-the-gson-library
之后,您將可以編寫如下代碼:
Type type = new TypeToken<Map<Integer, Plans>>(){}.getType();
Map<Integer, Plans> myMap = gson.fromJson("your json from db", type);
並在您的適配器中使用此map.values()
您的Plans
類應如下所示:
class Plans {
String order_number;
String typ_first;
String typ_last;
String order_date_time;
}
如果需要其他字段名稱,則必須使用@SerializedName
批注
最后,您應該編寫類似的內容((我不知道語法是否為100%,現在不打開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();
}
並修改您的模型類:
public class Plans {
@SerializedName("order_number")
String planTitle;
@SerializedName("typ_last")
String planType;
@SerializedName("order_date_time")
String planDate;
....
希望對您有幫助。
檢查以下代碼(您可以刪除@Test批注):
class Plans {
String typ_firstString;
String typ_last;
String order_date_time;
public Plans(String typ_firstString, String typ_last, String order_date_time) {
this.typ_firstString = typ_firstString;
this.typ_last = typ_last;
this.order_date_time = order_date_time;
}
}
class PlansResponse {
boolean status;
List<Plans> plans;
}
@Test
public void testPlacesResponseDeserializer() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(PlansResponse.class, new PlansResponseDeserializer())
.create();
String jsonString = "{\"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\"}}";
PlansResponse plansResponse = gson.fromJson(jsonString, PlansResponse.class);
assert plansResponse.status == true;
assert plansResponse.plans.size() == 2;
}
class PlansResponseDeserializer implements JsonDeserializer<PlansResponse> {
private String getElementAsString(JsonObject jsonObject, String key) {
JsonElement element = jsonObject.get(key);
return element.getAsString();
}
@Override
public PlansResponse deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
PlansResponse plansResponse = new PlansResponse();
List<Plans> plansList = new ArrayList<>();
Gson gson = new Gson();
Type type = new TypeToken<Map<String, JsonObject>>(){}.getType();
Map<String, JsonElement> map = gson.fromJson(json, type);
for(Map.Entry<String, JsonElement> entry : map.entrySet()) {
String key = entry.getKey();
if("success".equals(key)) {
JsonPrimitive jsonPrimitive = (JsonPrimitive) entry.getValue();
plansResponse.status = jsonPrimitive.getAsBoolean();
continue;
}
JsonObject jsonObject = (JsonObject)entry.getValue();
String typ_firstString = getElementAsString(jsonObject, "typ_first");
String typ_last = getElementAsString(jsonObject, "typ_last");
String order_date_time = getElementAsString(jsonObject, "order_date_time");
plansList.add(new Plans(typ_firstString, typ_last, order_date_time));
}
plansResponse.plans = plansList;
return plansResponse;
}
}
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