android의 listview에서 위도와 경도 목록을 모두 표시

Question

android.I에서 listview의 위도와 경도 목록을 5 초마다 표시하려고합니다.이 항목을 시도했습니다.

내 Main 클래스은 다음과 같습니다 -

public class MapdemoActivity extends ListActivity 
{ 
private ArrayList<MapData> mapdata = new ArrayList<MapData>(); 
private MapDataAdapter m_adapter; 

public String lng; 
public String lat; 

private Button retrieveLocationButton; 
private LocationManager locationManager; 

private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; //1 meters 
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 5000;  //5 seconds 

@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    locationManager.requestLocationUpdates(
      LocationManager.GPS_PROVIDER, 
      MINIMUM_TIME_BETWEEN_UPDATES, 
      MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, 
      new MyLocationListener() 
    ); 

    this.m_adapter = new MapDataAdapter(this, R.layout.row, mapdata); 
    setListAdapter(this.m_adapter); 

} 

private class MyLocationListener implements LocationListener { 

    public void onLocationChanged(Location location) 
    { 
     location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); 

     if (location != null) 
     { 
      lat=Double.toString(location.getLatitude()); 
      lng=Double.toString(location.getLongitude()); 

      MapData data = new MapData(); 

       data.setLatitude(lat); 
       data.setLongitude(lng); 

      mapdata.add(data); 

      Log.i("Lat", mapdata.get(0).Latitude); 
      Log.i("Lng", lng+location.getLatitude()); 
     } 
    } 

    public void onStatusChanged(String s, int i, Bundle b) { 
     Toast.makeText(MapdemoActivity.this, "Provider status changed", 
       Toast.LENGTH_LONG).show(); 
    } 

    public void onProviderDisabled(String s) { 
     Toast.makeText(MapdemoActivity.this, 
       "Provider disabled by the user. GPS turned off", 
       Toast.LENGTH_LONG).show(); 
    } 

    public void onProviderEnabled(String s) { 
     Toast.makeText(MapdemoActivity.this, 
       "Provider enabled by the user. GPS turned on", 
       Toast.LENGTH_LONG).show(); 
    } 

} 

private class MapDataAdapter extends ArrayAdapter<MapData> 
{ 

    private ArrayList<MapData> items; 

    public MapDataAdapter(Context context, int textViewResourceId, ArrayList<MapData> items) 
    { 
      super(context, textViewResourceId, items); 
      this.items = items; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) 
    { 
      View v = convertView; 
      if (v == null) 
      { 
       LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
       v = vi.inflate(R.layout.row, null); 
      } 
      MapData o = items.get(position); 
      if (o != null) 
      { 
        TextView lat = (TextView) v.findViewById(R.id.tt1); 
        TextView lng = (TextView) v.findViewById(R.id.tt2); 
        if (lat != null) 
        { 
          lat.setText("Latitude: "+o.getLatitude());       
        } 
        if(lng != null) 
        { 
          lng.setText("Longitude: "+ o.getLongitude()); 
        } 
      } 
      return v; 
    } 
} 

} 

MapData 클래스

package com.ap.map.demo; 

public class MapData 
{ 

public String Longitude; 
public String Latitude; 

public String getLatitude() { 
    return Latitude; 
} 
public void setLatitude(String latitude) { 
    this.Latitude = latitude; 
} 
public String getLongitude() { 
    return Longitude; 
} 
public void setLongitude(String longitude) { 
    this.Longitude = longitude; 
} 
} 

그것은 변화를 인식지고 있지 않은 listview.No error.But에서 아무것도 표시되지 않습니다. 누구든지이 일을 도울 수 있습니까?

Answer 1

mapdata.add(data); 다음에 notifyDataSetChanged()으로 전화하십시오. 그러면 listView에 어댑터 내용이 변경되었음을 알립니다.