在我的应用中，我实现了一个回收 View 。我有一个 json 格式的 api，其中包含一个研究所的用户信息。现在最初我想将数据存储到 Realm DB 中，然后它们用这些数据填充我的 recyclerview。因此，我正在尝试获取此过程的一些工作文件。但我还没有找到任何明确的解释。我不确定它的正确程序。我是否需要使用 Httpurlconnection 获取所有数据，然后将其存储到 Realm。或者有什么替代方法可以做到这一点。
编辑问题
在得到一些建议后，我尝试了以下代码。我正在使用 Retrofit 1.9。因为我无法使用 Retrofit 2+ 版本获取数据。当我从改造 1.9 中得到结果时。我想以此为基础保留我的代码。但是现在对如何基于 Realm 设置适配器感到困惑。因为我有单独的模型类用于 json api 和 Realm 。我想首先将数据存储到 Realm ，然后将其填充到 recaclerview。此时，recyclerview 直接填充了服务器数据。
在得到答案的指导后，我按如下方式编辑了我的问题
Json 响应
[
{
"_id": "fhfh49879787989",
"dn": "CN=9879798789",
"whenChanged": "20170704065349.0Z",
"name": "Student",
"mail": "student@mail.com",
"updated_at": "2017-07-04T18:22:43.624Z"
},
{
"_id": "595bdcf32c67a3f9ee6c2a25",
"dn": "CN=dsfdsfsdfsf",
"givenName": "Accounting Office",
"whenChanged": "20170801114732.0Z",
"name": "Accounting",
"mail": "accounting@mail.com",
"updated_at": "2017-07-04T18:22:43.641Z"
},
{
"_id": "584ab3b4122d13e1b0d1578d",
"dn": "CN=sfdfsfsdfl",
"sn": "Abels",
"title": "Student",
"givenName": "Gardrut",
"whenChanged": "20170807150844.0Z",
"department": "PMO",
"company": "Multi Lmited",
"name": "Mike Lizz",
"mail": "mail@yahoo.com",
"mobile": "+1321646498",
"updated_at": "2016-12-09T13:37:56.175Z"
},
{
"_id": "584ab3b3122d13e1b0d15735",
"dn": "CN=xdfsdfsfsdf",
"sn": "Acsdff",
"title": "Software Engineer",
"givenName": "Olin",
"whenChanged": "20170810064841.0Z",
"department": "Head",
"company": "Private limited",
"name": "James Oliver",
"mail": "mail@gmail.com",
"mobile": "+41228",
"updated_at": "2016-12-09T13:37:55.813Z"
},
....
]
我的模型类
public class ColleagueModel {
@Expose
private String _id;
@Expose
private String dn;
@Expose
private String givenName;
@Expose
private String whenChanged;
@Expose
private String name;
@Expose
private String mail;
@Expose
private String updatedAt;
@Expose
private String sn;
@Expose
private String title;
@Expose
private String department;
@Expose
private String company;
@Expose
private String mobile;
public ColleagueModel(){
}
//getter and setter
}
我使用的库
compile 'com.squareup.retrofit:retrofit:1.9.0'
compile 'com.squareup.okhttp:okhttp:2.3.0'
compile 'com.google.code.gson:gson:2.3'
compile 'com.squareup.picasso:picasso:2.5.2'
API服务
public interface ColleagueApiService {
@GET("/api/users")
void getColleague(Callback<String> flowers);
RestManagerClass
public class ColleagueRestManager {
public ColleagueApiService mColleagueApi;
public ColleagueApiService getColleagueApi() {
if (mColleagueApi == null) {
GsonBuilder gson = new GsonBuilder();
gson.registerTypeAdapter( String.class, new StringDeserializer() );
mColleagueApi = new RestAdapter.Builder()
.setEndpoint( Constants.HTTP.BASE_URL )
.setConverter( new GsonConverter( gson.create() ) )
.build()
.create( ColleagueApiService.class );
}
return mColleagueApi;
}
}
适配器类
public class MyColleaguesAdapter extends RecyclerView.Adapter<MyColleaguesAdapter.ColleagueHolder>/{
public static String TAG = MyColleaguesAdapter.class.getSimpleName();
private List<ColleagueModel> mColleague;
private Context context;
public interface ColleagueListListener {
}
public MyColleaguesAdapter(List<ColleagueModel> colleagues,Context context)
{
this.context=context;
mColleague = colleagues;
}
public void addColleague(ColleagueModel colleague) {
//Log.d(TAG,colleague.name);
mColleague.add(colleague);
notifyDataSetChanged();
}
@Override
public ColleagueHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.colleage_row_layout,parent,false);
return new ColleagueHolder(view);
}
@Override
public void onBindViewHolder(ColleagueHolder holder, int position) {
final ColleagueModel currentColleague = mColleague.get(position);
Picasso.with(holder.itemView.getContext());
holder.colleagueName.setText(currentColleague.getName());
holder.companyName.setText(currentColleague.getCompany());
holder.jobTitle.setText(currentColleague.getTitle());
holder.colleaguePicture.setImageResource( R.drawable.profile_image );
Picasso.with(holder.itemView.getContext()).load( Constants.HTTP.PHOTO_URL + currentColleague.getMail()).into(holder.colleaguePicture);
holder.cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i=new Intent(context,DetailMyColleague.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra("IMAGE_URL",Constants.HTTP.PHOTO_URL + currentColleague.getMail());
i.putExtra("name",currentColleague.getName());
i.putExtra("title",currentColleague.getTitle());
i.putExtra("company",currentColleague.getCompany());
i.putExtra("mobile",currentColleague.getMobile());
i.putExtra("mail",currentColleague.getMail());
i.putExtra("department",currentColleague.getDepartment());
context.startActivity(i);
}
});
}
@Override
public int getItemCount() {
return mColleague.size();
}
public class ColleagueHolder extends RecyclerView.ViewHolder{
public CardView cardView;
public ImageView colleaguePicture;
public TextView colleagueName;
public TextView companyName;
public TextView jobTitle;
public ColleagueHolder(View itemView) {
super(itemView);
colleaguePicture= itemView.findViewById(R.id.colleague_picture);
colleagueName= itemView.findViewById(R.id.colleague_name);
companyName= itemView.findViewById(R.id.company_name);
jobTitle= itemView.findViewById(R.id.job_title);
cardView= itemView.findViewById(R.id.cardview_user);
}
}
}
Controller 类
public class Controller {
private static final String TAG = Controller.class.getSimpleName();
private UserCallbackListener mListener;
private ColleagueRestManager mApiManager;
public Controller(UserCallbackListener listener) {
mListener = listener;
mApiManager = new ColleagueRestManager();
}
public void startFetching(){
mApiManager.getColleagueApi().getColleague(new Callback<String>() {
@Override
public void success(String s, Response response) {
Log.d(TAG, "JSON :: " + s);
try {
JSONArray array = new JSONArray(s);
for(int i = 0; i < array.length(); i++) {
JSONObject object = array.getJSONObject(i);
ColleagueModel colleague = new ColleagueModel();
colleague.setName( object.optString( "name" ) );
colleague.setCompany(object.optString("company"));
colleague.setTitle(object.optString("title"));
colleague.setMail( object.optString("mail"));
colleague.setMobile(object.optString("mobile"));
colleague.setDepartment(object.optString("department"));
mListener.onFetchProgress(colleague);
}
} catch (JSONException e) {
mListener.onFetchFailed();
}
mListener.onFetchComplete();
}
@Override
public void failure(RetrofitError error) {
Log.d(TAG, "Error :: " + error.getMessage());
mListener.onFetchComplete();
}
});
}
public interface UserCallbackListener{
void onFetchStart();
void onFetchProgress(ColleagueModel user);
void onFetchProgress(List<ColleagueModel> userList);
void onFetchComplete();
void onFetchFailed();
}
}
主要 Activity
public class MyColleaguesPage extends AppCompatActivity implements Controller.UserCallbackListener/*MyColleaguesAdapter.ColleagueListListener*/ {
private RecyclerView recyclerView;
private MyColleaguesAdapter adapter;
private List<ColleagueModel> mColleagueList = new ArrayList<>();
private Controller mController;
private Realm colleagueRealm;
private LinearLayoutManager layoutManager;
private RealmResults<MyColleagueModel> colleagueResult;
private List<MyColleagueModel> filteredModelList;
private RealmChangeListener realmListener;
private static final String DIALOG_TAG = "EmployeeDialog";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mycolleagues_layout);
configViews();
mController = new Controller(MyColleaguesPage.this);
mController.startFetching();
colleagueRealm = Realm.getDefaultInstance();
}
private void configViews() {
recyclerView = this.findViewById(R.id.colleagues_recycler);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(MyColleaguesPage.this));
recyclerView.setRecycledViewPool(new RecyclerView.RecycledViewPool());
adapter = new MyColleaguesAdapter(mColleagueList,getApplicationContext());
recyclerView.setAdapter(adapter);
}
RealmApplication 类
public class Application extends Application {
@Override
public void onCreate() {
super.onCreate();
Realm.init(this);
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder()
.deleteRealmIfMigrationNeeded()
.build();
Realm.setDefaultConfiguration(realmConfiguration);
}
Realm 模型
public class RealmUserModel extends RealmObject{
public static final String ID = "id";
private String id;
private String dn;
private String givenName;
private String whenChanged;
private String name;
private String mail;
private String updatedAt;
private String sn;
private String title;
private String department;
private String company;
private String mobile;
//getter and setter
}
最佳答案
1.) 使用 jsonschema2pojo.org 为 json 生成 API 响应类
public class EmployeeResponse {
@SerializedName("_id")
@Expose
private String id;
@SerializedName("dn")
@Expose
private String dn;
@SerializedName("sn")
@Expose
private String sn;
@SerializedName("title")
@Expose
private String title;
@SerializedName("givenName")
@Expose
private String givenName;
@SerializedName("whenChanged")
@Expose
private String whenChanged;
@SerializedName("department")
@Expose
private String department;
@SerializedName("company")
@Expose
private String company;
@SerializedName("name")
@Expose
private String name;
@SerializedName("mail")
@Expose
private String mail;
@SerializedName("mobile")
@Expose
private String mobile;
@SerializedName("updated_at")
@Expose
private String updatedAt;
....
}
2.) 从 http://square.github.io/retrofit/ 将 Retrofit 添加到您的项目中所以你甚至不会开始考虑使用 HttpUrlConnection
compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.squareup.retrofit2:converter-gson:2.3.0'
compile 'com.google.code.gson:gson:2.8.1'
3.) 你定义Retrofit接口(interface)
public interface ApiService {
@GET("api/users")
Call<List<User>> getUsers();
}
4.) 通过 Retrofit 创建 ApiService 实现
public class CustomApplication extends Application {
// add to manifest ofc
Retrofit retrofit;
ApiService service;
@Override
public void onCreate() {
super.onCreate();
retrofit = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())
.baseUrl("https://app.com/")
.build();
service = retrofit.create(ApiService.class);
}
// get, get...
}
5.) 创建你的 RealmObject
public class Employee extends RealmObject {
private String id ;
private String dn ;
private String givenName ;
private String whenChanged ;
private String name ;
private String mail ;
private String updatedAt ; // maybe Date?
private String sn ;
private String title;
private String department;
private String company;
private String mobile;
//getter and setter method
}
6.) 创建映射来自 api 响应类的数据的类
public class EmployeeMapper {
Employee toEmployee(EmployeeResponse response) {
// ...
return employee;
}
}
7.) 将 Employee 写入 Realm
try(Realm r = Realm.getDefaultInstance()) {
r.executeTransaction((realm) -> {
realm.insertOrUpdate(employees);
});
}
8.) 根据文档 https://realm.io/docs/java/latest/#adapters 通过 RealmRecyclerViewAdapter 监听 Realm 的变化
public class EmployeeAdapter extends RealmRecyclerViewAdapter<...
关于android - 如何将 JSON 数据存储到 Realm 中并将其显示到 recyclerview 中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45696080/