0
のスタートに1つのアクティビティから複数のフラグメントを更新する私は、メイン活性を有するアプリを作っていて、主な活動は、2つの断片がありますのAndriod
- MapFragmentは（ここで、すべての場所のピンが含まれていますレストラン）がある
- RestaurantsFragment（レストランのリストが含まれています）
これまでユーザーがアプリを開いてタブをクリックすると、myRestaurantsFragmentをサーバーから更新することができました。 私がしたいことは次のとおりです - ユーザーがアプリケーションを起動したときにサーバーから両方のフラグメントを更新したいと思います。私がしたくないのは、ローカルのsqliteデータベースにレストランを保存することです。私はメインのアクティビティでリストを取得して両方のタブに渡し、レストランのリストをmyRestaurantFragmentに渡したいと思います。はこのリストから同じ情報を私のMapsFragmentに渡します。私は主な活動に私のリストコードを入れて、主な活動から3つの断片に渡すことを考えましたが、私は初心者であり、簡単な例を経てこのアプリケーションに取り組んでいるので、少し失われています。
MainActivity：
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private SessionManager session;
private SQLiteHandler db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
returnMyRestaurants();
// SqLite database handler
db = new SQLiteHandler(getApplicationContext());
// session manager
session = new SessionManager(getApplicationContext());
if (!session.isLoggedIn()) {
Intent intent = new Intent(this, LoginActivity.class);
startActivity(intent);
} else {
TabLayout tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
tabLayout.addTab(tabLayout.newTab().setText(getString(R.string.tab_map)));
tabLayout.addTab(tabLayout.newTab().setText(getString(R.string.tab_my_restaurants)));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setTabMode(TabLayout.MODE_FIXED);
final ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
final PagerAdapter adapter = new PagerAdapter
(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
MyRestaurantsFragment mapsFragment = new MyRestaurantsFragment();
Bundle args = new Bundle();
args.putParcelable("restaurantList", (Parcelable) restaurantList);
mapsFragment.setArguments(args);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
...
public void returnMyRestuaurants() {
SQLiteHandler db = new SQLiteHandler(getApplicationContext());
HashMap<String, String> user = db.getUserDetails();
final String userId = user.get("uid");
StringRequest restuaurantReq = new StringRequest(Request.Method.POST,
AppConfig.URL_GET_RESTUAURANT, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
boolean error = jObj.getBoolean("error");
if (!error) {
JSONArray restuaurants = jObj.getJSONArray("restuaurant");
// Parsing json
for (int i = 0; i < restuaurants.length(); i++) {
try {
JSONObject obj = restuaurants.getJSONObject(i);
RestuaurantParcelableModel restuaurant = new RestuaurantParcelableModel();
restuaurant.setUserName(obj.getString("name"));
if (obj.getString("image") != null && !obj.getString("image").isEmpty()) {
restuaurant.setThumbnailUrl(obj.getString("image"));
}
restuaurant.setLat(obj.getString("latitude"));
restuaurant.setLon(obj.getString("longitude"));
restuaurant.setDate(obj.getString("event_date"));
restuaurant.setTime(obj.getString("event_time"));
// adding restuaurant to restuaurant array
restuaurantList.add(restuaurant);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes so that it renders the list view with updated data
adapter.notifyDataSetChanged();
} else {
// Error. Get the error message
String errorMsg = jObj.getString("error_msg");
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
...
MapFragment：
public class MapsFragment extends Fragment {
private GoogleMap mMap;
MapView mapView;
Marker marker; // Marker
private static final int MY_LOCATION_REQUEST_CODE = 1;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// inflate and return the layout
View v = inflater.inflate(R.layout.fragment_maps, container,
false);
mapView = (MapView) v.findViewById(R.id.map);
mapView.onCreate(savedInstanceState);
mapView.onResume();// needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mMap = mapView.getMap();
mMap.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
} else {
// Show rationale and request permission.
}
String provider = locationManager.getBestProvider(criteria, true);
Location myLocation = locationManager.getLastKnownLocation(provider);
double latitude = 51.4825766;
double longitude = -0.0076589;
if (myLocation != null) {
latitude = myLocation.getLatitude();
longitude = myLocation.getLongitude();
}
MarkerOptions markerOptions = new MarkerOptions().position(
new LatLng(latitude, longitude)).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_me));
mMap.addMarker(markerOptions);
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(latitude, longitude)).zoom(12).build();
mMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
@Override
public void onMapLongClick(final LatLng arg0) {
RequestQueue queue = Volley.newRequestQueue(getActivity());
String url = "https://maps.googleapis.com/maps/api/geocode/json?latlng=" + String.valueOf(arg0.latitude) + "," + String.valueOf(arg0.longitude) + "&key=myKey";
// Request a string response from the provided URL.
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jObj = new JSONObject(response).getJSONArray("results").getJSONObject(0).getJSONArray("address_components");
Intent intent = new Intent(getActivity(), SetRestaurantActivity.class);
for (int i = 0; i < jObj.length(); i++) {
String componentName = new JSONObject(jObj.getString(i)).getJSONArray("types").getString(0);
if (componentName.equals("postal_code") || componentName.equals("locality") || componentName.equals("street_number") || componentName.equals("route")
|| componentName.equals("neighborhood") || componentName.equals("sublocality") || componentName.equals("administrative_area_level_2")
|| componentName.equals("administrative_area_level_1") || componentName.equals("country")) {
intent.putExtra(componentName, new JSONObject(jObj.getString(i)).getString("short_name"));
}
}
intent.putExtra("latitude", arg0.latitude);
intent.putExtra("longitude", arg0.longitude);
startActivity(intent);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
int x = 1;
}
});
queue.add(stringRequest);
}
});
return v;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if (requestCode == MY_LOCATION_REQUEST_CODE) {
if (permissions.length == 1 &&
permissions[0] == Manifest.permission.ACCESS_FINE_LOCATION &&
grantResults[0] == PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
} else {
// Permission was denied. Display an error message.
}
}
}
RestaurantsFragment：
import android.os.Parcel;
import android.os.Parcelable;
public class RestaurantParcelableModel implements Parcelable {
private String userName, thumbnailUrl, lat, lon, restname, description;
...
public class RestaurantsFragment extends Fragment {
private static final String TAG = RestaurantsFragment.class.getSimpleName();
// Restaurants json url
private ProgressDialog pDialog;
private List<Restaurant> restaurantList = new ArrayList<>();
private ListView listView;
private CustomListAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_restaurants, container, false);
listView = (ListView) view.findViewById(R.id.restaurants_list);
adapter = new CustomListAdapter(getActivity(), restaurantList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading...");
pDialog.show();
Bundle bundle = this.getArguments();
if (bundle != null) {
restaurantList = bundle.getParcelable("restaurantList");
}
return view;
}
私はすでにparcelableモデルを作りました
Obsarvableデザインパターンは、トリックを行うだろう。 –