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온라인 mySQL 데이터베이스에서 정보를 실행하기 위해 AsyncTask를 사용하고 있습니다. 그런 다음 JSON 구문 분석을 사용하여 데이터베이스의 정보를 MapBox지도의 마커로 추가합니다. 현재 사용자가 새로운 마커 (코드에 washroom)를 업로드하면 정보를 데이터베이스에 업로드 한 다음 onPostExecute 메소드를 실행하고 MapsActivity.java으로 돌아갑니다. MapsActivity.java은지도를 새로 고침하고 새로 추가 된 마커를 표시해야하지만 그렇지 않습니다. 새로운 마커를 추가하기 전에 추가 된 마커 만 표시합니다. 앱을 닫고 열면 마커가 업데이트되어 새로운 마커를 표시합니다! 어떤 도움을 주시면 감사하겠습니다! 더 이상 내 코드의 필요가 있다면, 좀 더 보여 드리겠습니다onPostExecute가 올바르게 활동을 시작하지 않습니다.
class BackgroundTask extends AsyncTask<String, Void, String> {
Context ctx;
public static boolean WASHROOMS_LOADED;
private String JSON_STRING;
private String json_string;
BackgroundTask(Context ctx) {
this.ctx = ctx.getApplicationContext();
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
String add_url = "http://appart-software.com/add_washroom.php";
String get_url = "http://appart-software.com/get_washroom.php";
@Override
protected String doInBackground(String... params) {
String method = params[0];
if (method.equals("addWashroom")) {
String location = params[1];
String name = params[2];
String price = params[3];
try {
URL url = new URL(add_url);
HttpURLConnection httpUrlConnection = (HttpURLConnection) url.openConnection();
httpUrlConnection.setRequestMethod("POST");
httpUrlConnection.setDoOutput(true);
OutputStream outputStream = httpUrlConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
String data_string = URLEncoder.encode("WClocation","UTF-8")+"="+URLEncoder.encode(location,"UTF-8")+"&"+
URLEncoder.encode("WCname","UTF-8")+"="+URLEncoder.encode(name,"UTF-8")+"&"+
URLEncoder.encode("WCprice","UTF-8")+"="+URLEncoder.encode(price,"UTF-8");
bufferedWriter.write(data_string);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpUrlConnection.getInputStream();
inputStream.close();
httpUrlConnection.disconnect();
return "Washroom Added!";
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
//You want to get washroom info
} else if (method.equals("getWashroom")){
try {
URL url = new URL(get_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
StringBuilder stringBuilder = new StringBuilder();
while ((JSON_STRING = bufferedReader.readLine())!=null) {
stringBuilder.append(JSON_STRING+"\n");
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
//Return JSON formatted info
return stringBuilder.toString().trim();
} catch (MalformedURLException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
if (result.equals("Washroom Added!")) {
Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
WASHROOMS_LOADED = false;
} else {
//setting result as a movable string
json_string = result;
//intent and sending JSON data
Intent intent = new Intent(ctx,MapsActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra("json_data",json_string);
ctx.startActivity(intent);
WASHROOMS_LOADED = true;
}
}
}
MapsActivity.java의
부
public class MapsActivity extends FragmentActivity {
private MapView mapView;
private MapboxMap map;
private ImageButton locationToggle;
private LocationServices locationServices;
private String json_string;
private JSONObject jsonObject;
private JSONArray jsonArray;
public static String WASHROOMINFO;
public static String CURRENT_LOCATION;
private static final int PERMISSIONS_LOCATION = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MapboxAccountManager.start(this, getString(R.string.accessToken));
setContentView(R.layout.activity_maps);
//getting location services
locationServices = com.mapbox.mapboxsdk.location.LocationServices.getLocationServices(MapsActivity.this);
//onClick to go to add washroom activity
findViewById(R.id.addWashroom).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (CURRENT_LOCATION != null) {
Intent intent = new Intent(getBaseContext(), AddWashroom.class);
startActivity(intent);
} else {
Toast.makeText(getBaseContext(),"You Must Turn on User Location Before Adding a Washroom!",Toast.LENGTH_LONG).show();
}
}
});
//washrooms have not been loaded in yet
if (!BackgroundTask.WASHROOMS_LOADED) {
//getting database info
String method = "getWashroom";
BackgroundTask backgroundTask = new BackgroundTask(getBaseContext());
backgroundTask.execute(method);
finish();
}
mapView = (MapView) findViewById(R.id.mapview);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(MapboxMap mapboxMap) {
//when map is ready assign mapboxMap variable
map = mapboxMap;
//Washroom loading has been requested and JSON data is ready
if (BackgroundTask.WASHROOMS_LOADED) {
//Getting JSON data from intent
json_string = getIntent().getExtras().getString("json_data");
try {
//new JSON object from JSON data
jsonObject = new JSONObject(json_string);
//gets JSON array from JSON object
jsonArray = jsonObject.getJSONArray("server_response");
//Marker list for buffering markers
List<Marker> markers = new ArrayList<Marker>();
//do this for all markers!
for (int i = 0; i < jsonArray.length(); i++) {
//Single JSON object of single marker
JSONObject JO = jsonArray.getJSONObject(i);
//Dividing location field into lat & lng
String latlng = JO.getString("location");
String[] latlngSplit = latlng.split(" , ",2);
double lat = Double.valueOf(latlngSplit[0]);
double lng = Double.valueOf(latlngSplit[1]);
//adding marker
Marker marker = map.addMarker(new MarkerOptions()
.title(JO.getString("name"))
.setSnippet(JO.getString("price"))
.position(new LatLng(lat,lng))
);
//add marker to markers list.
markers.add(marker);
}
BackgroundTask.WASHROOMS_LOADED = false;
} catch (JSONException e) {
e.printStackTrace();
}
}
}
});
locationToggle = (ImageButton) findViewById(R.id.location_toggle);
locationToggle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (map != null) {
//toggle GPS when clicking show location button
toggleGps(!map.isMyLocationEnabled());
}
}
});
}
BackgroundTask (AsyncTask를).
'onNewIntent'를 무시하십시오. 그렇지 않으면 인 텐트 데이터가 업데이트되지 않습니다. – TWL
'startActivity()'에서'intent'는 기본적으로'MapActivity'의 새로운 인스턴스를 생성합니다. 따라서이 결과를 얻고 있습니다. 이 두 클래스를'인터페이스 '로 만들고 그것을 사용하여 상호 작용할 수있다. – Shaishav