我正在设计一个需要原生联系人列表的应用程序。我正在使用cursorloader检索联系人并将其保存在我的应用程序类
中的全局hashmap中public class WoofyApp extends Application {
private static WoofyApp mInstance;
private FontFactory fontFactory;
private PreferenceService preferenceService;
private RequestQueue mRequestQueue;
private VolleyService mVolley;
private Validator mValidator;
private NetworkService mNetwork;
private DaoSession daoSession;
private HashMap<String,String> persons;
private ProgressDialog pdLoading;
private UserDao userDao;
private static final String WOOFYAPP = "WOOFYAPP";
@Override
public void onCreate() {
super.onCreate();
mInstance = this;
persons = new HashMap<>();
}
public HashMap<String, String> getPersons(){
return persons;
}
public void setPersons(HashMap<String,String> per){
persons = per;
}
我正在访问相关活动和片段中的联系人列表。我在ContactService类中设置它:
public class ContactService implements LoaderManager.LoaderCallbacks<Cursor> {
HashMap<String, String> hmContacts;
ArrayList<Person> alContacts;
private Context mContext;
private EventBus bus;
WoofyApp mApp;
private static final String[] PROJECTION = {
ContactsContract.CommonDataKinds.Phone.NUMBER,
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME
};
public ContactService(AppCompatActivity context) {
hmContacts = new HashMap<>();
alContacts = new ArrayList<>();
this.mContext = context;
bus = EventBus.getDefault();
mApp = WoofyApp.getApp();
Log.d(Constants.LIFE_CYCLE,"ContactService called");
if(mApp.getPersons().size()==0){
context.getLoaderManager().initLoader(0,null,this);
if(!context.getLoaderManager().getLoader(0).isReset()) {
context.getLoaderManager().restartLoader(0, null, this);
}
Log.d(Constants.LIFE_CYCLE,"ContactService loader called");
} else{
this.hmContacts = mApp.getPersons();
this.alContacts = hashToArray(hmContacts);
bus.post(hmContacts);
bus.post(new ContactsAdapter(mContext, R.layout.row_contact_child, alContacts));
Log.d(Constants.LIFE_CYCLE,"ContactService persons called");
}
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
Log.d(Constants.LIFE_CYCLE,"ContactService onCreateLoader called");
return new CursorLoader(
mContext,
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
PROJECTION,
null,
null,
null
);
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
if (data.getCount() > 0) {
while (data.moveToNext()) {
String name = data.getString(
data.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String number = Validator.formatNumbers(data.getString(
data.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));
if (!hmContacts.containsKey(number)){
alContacts.add(new Person(name, number));
}
hmContacts.put(number, name);
}
Log.d(Constants.LIFE_CYCLE,"onLoadFinished loader called "+hmContacts.size());
mApp.setPersons(hmContacts);
bus.post(hmContacts);
bus.post(new ContactsAdapter(mContext, R.layout.row_contact_child, alContacts));
}
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
public static ArrayList<Person> hashToArray(HashMap<String,String> hm){
Iterator it = hm.entrySet().iterator();
ArrayList<Person> persons = new ArrayList<>();
while (it.hasNext()) {
Map.Entry pair = (Map.Entry)it.next();
persons.add(new Person((String)pair.getValue(),(String)pair.getKey()));
it.remove();
}
return persons;
}
}
THE STRANGE PART
当我第一次从主要活动及其片段访问它时,它正在正确加载。但是当我从不同的活动返回后尝试访问它时。 onResume主要活动显示大小0.任何想法如何发生这种情况?
答案 0 :(得分:0)
添加您需要的设置模型:
public class SettingsModel {
public String facebookToken;
public String twitterToken;
//... anything you need
}
制作设置服务并在扩展应用程序类中将其作为
启动new SettingsService();
SettingsService:
public class SettingsService {
private static String KEY = "yourDesiredSettingsKey";
private static Context mContext;
public static SettingsModel settings;
public SettingsService(){
mContext = YourApplication.getMainContext();
//if(settings == null){
settings = getSettings();
//}
}
public static void saveSettings(){
if(settings == null){
settings = new SettingsModel();
}
SharedPreferences.Editor editor = mContext
.getSharedPreferences(KEY, Activity.MODE_PRIVATE).edit();
Gson gson = new Gson();
String jsonSettings = gson.toJson(settings);
editor.putString("settings", jsonSettings );
editor.commit();
settings = getSettings();
}
public static SettingsModel getSettings() {
SharedPreferences editor = mContext.getSharedPreferences(KEY,
Activity.MODE_PRIVATE);
try{
String jsonSettings = editor.getString("settings","settings");
Gson gson = new Gson();
settings = gson.fromJson(jsonSettings, SettingsModel.class);
}catch (Exception e){
settings = new SettingsModel();
}
return settings;
}
}
in gradle:
compile 'com.google.code.gson:gson:2.4'
这就是全部,您可以通过以下任何地方访问您的设置:
String token = SettingsService.settings.facebookToken;
或更新它们:
SettingsService.settings.facebookToken = "yourToken";
SettingsService.saveSettings();
答案 1 :(得分:0)
我得到了..我正在使用一种方法将hasmap转换为arraylist,其中包含iterator.remove()..它删除了联系人并将hashmap留空。很抱歉打扰你这个愚蠢的问题。