I've follow this tuto for my project (https://cloud.google.com/developers/articles/how-to-build-mobile-app-with-app-engine-backend-tutorial), and everything works fine.
我已经按照这个tuto进行了我的项目（https://cloud.google.com/developers/articles/how-to-build-mobile-app-with-app-engine-backend-tutorial），一切正常。
But when I wanted to use with objectify classes for my entities, It doesn't work, i can't retrieve data on my datastore with my android app !
但是，当我想使用objectify类为我的实体，它不起作用，我无法使用我的Android应用程序检索我的数据存储区中的数据！
For example, with that code it's okay, I can get my user back from my android app:
例如，使用该代码，没关系，我可以从我的Android应用程序中恢复用户：
import javax.jdo.annotations.Index;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
@Index
public class Utilisateur {
//Nos variables de classes
@Id String num_portable; //Clé pour notre entité NOTION CLE PRIMAIRE String car c'est à nous de le définir.
Boolean sexe;
int date_naissance;
String position_geo;
String liste_contact;
Boolean blacklistage;
//Constructeur par défaut (Obligatoire pour Objectify)
private Utilisateur(){}
public Utilisateur (String num_portable, Boolean sexe, int date_naissance, String position_geo, String liste_contact, Boolean blacklistage) {
this.num_portable=num_portable;
this.sexe=sexe;
this.date_naissance=date_naissance;
this.position_geo=position_geo;
this.liste_contact=liste_contact;
this.blacklistage=blacklistage;
}
public String getNum_portable() {
return num_portable;
}
}
But I don't use Objectify.. When I want to use Objectify, with that code, it doesn't works : I'm just replace this code :
但我不使用Objectify ..当我想使用Objectify时，使用该代码，它不起作用：我只是替换这段代码：
import javax.jdo.annotations.Index;
import javax.persistence.Entity;
import javax.persistence.Id;
With this one :
有了这个：
import com.googlecode.objectify.annotation.Entity;
import com.googlecode.objectify.annotation.Id;
import com.googlecode.objectify.annotation.Index;
and I get this error on my app engine:
我在我的应用引擎上收到此错误：
com.google.api.server.spi.SystemService invokeServiceMethod: Class Utilisateur for query has not been resolved. Check the query and any imports/aliases specification
javax.persistence.PersistenceException: Class Utilisateur for query has not been resolved. Check the query and any imports/aliases specification
So my question is: Can we use Objectify with Android App or the data persistence doesnt work with it (And App Engine)?
所以我的问题是：我们可以将Objectify与Android App一起使用，还是数据持久性不能与它一起使用（和App Engine）？
Edit: That is my code on my android app that call backend(Same code as here => https://cloud.google.com/developers/articles/how-to-build-mobile-app-with-app-engine-backend-tutorial):
编辑：这是我的Android应用程序上调用后端的代码（与此处相同的代码=> https://cloud.google.com/developers/articles/how-to-build-mobile-app-with-app-engine-后端教程）：
public class JeveuxvoirActivity extends Activity {
private ListView utilisateursList;
private List<Utilisateur> utilisateurs = null;
//Création de notre activité
public void onCreate(Bundle savedInstanceState) {
//Création de notre interface graphique
super.onCreate(savedInstanceState);
//Remove title bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
//On définit le Layout de notre activité
setContentView(R.layout.activity_jeveuxvoir);
utilisateursList = (ListView) findViewById(R.id.list_principal_user);
// start retrieving the list of nearby places
new ListOfUtilisateursAsyncRetriever().execute();
}
//*******************************************************
// FONCTIONS ASYNC
//*******************************************************
/**
* AsyncTask for retrieving the list of places (e.g., stores) and updating the
* corresponding results list.
*/
private class ListOfUtilisateursAsyncRetriever extends AsyncTask<Void, Void, CollectionResponseUtilisateur> {
@Override
protected CollectionResponseUtilisateur doInBackground(Void... params) {
Utilisateurendpoint.Builder endpointBuilder = new Utilisateurendpoint.Builder(
AndroidHttp.newCompatibleTransport(), new JacksonFactory(), null);
endpointBuilder = CloudEndpointUtils.updateBuilder(endpointBuilder);
CollectionResponseUtilisateur result;
Utilisateurendpoint endpoint = endpointBuilder.build();
try {
result = endpoint.listUtilisateur().execute();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
result = null;
}
return result;
}
@Override
@SuppressWarnings("null")
protected void onPostExecute(CollectionResponseUtilisateur result) {
ListAdapter utilisateursListAdapter = createUtilisateurListAdapter(result.getItems());
utilisateursList.setAdapter(utilisateursListAdapter);
utilisateurs = result.getItems();
}
}
private ListAdapter createUtilisateurListAdapter(List<Utilisateur> utilisateurs) {
List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
for (Utilisateur utilisateur : utilisateurs) {
Map<String, Object> map = new HashMap<String, Object>();
map.put("utilisateurIcon", R.drawable.ic_launcher);
map.put("utilisateurPort", utilisateur.getNumPortable());
data.add(map);
}
SimpleAdapter adapter = new SimpleAdapter(JeveuxvoirActivity.this, data, R.layout.utilisateur_item,
new String[] {"utilisateurIcon", "utilisateurPort"},
new int[] {R.id.utilisateur_Icon, R.id.utilisateur_port});
return adapter;
}
1 个解决方案
#1
1
JPA and objectify are 2 alternatives for connecting to dataStore. Avoid using both together. Both have their own conventions that work best if used alone.
JPA和objectify是连接到dataStore的两种选择。避免一起使用。如果单独使用，两者都有自己的约定。
#1
1
JPA and objectify are 2 alternatives for connecting to dataStore. Avoid using both together. Both have their own conventions that work best if used alone.
JPA和objectify是连接到dataStore的两种选择。避免一起使用。如果单独使用，两者都有自己的约定。