Wie wird der Marker in Google Map platziert, nachdem Breiten- und Längengrad von json analysiert wurden?

Question

Ich habe Parse-JSON-Datei, die mehr als hundert Ortsnamen enthalten, dort Breiten- und Längengrad.
Bis jetzt kann ich Ortsname, Breitengrad und Längengrad bekommen.

Ich möchte diese alle Werte in Google Map plotten und einen Marker für jeden von ihnen setzen.

Auch ich möchte den Standortnamen, den ich von der Analyse von JSON erhalten habe, wenn Benutzer den Marker in Google Map platziert tippen.

Ich löse es Jungs. siehe unten:

Update: main.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" > 

<com.google.android.maps.MapView 
    android:id="@+id/mapView" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:enabled="true" 
    android:clickable="true" 
    android:apiKey="0hlQp-ys3VmVGNLoJ0aGYQhDmBH5KC-ZQmc3yNA" 
    /> 

<LinearLayout 
    android:id="@+id/zoom" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" /> 

</RelativeLayout> 

ShowMapActivity.java

public class ShowMapActivity extends MapActivity { 

private static String url = "http://10.0.2.2/test/myfile.php"; 
JSONArray root = null; 
private static final String TAG_ROOT = "root"; 
private static final String TAG_LATTITUDE = "lattitude"; 
private static final String TAG_LONGITUDE = "longitude"; 
private static final String TAG_NAME="name"; 

MapController mc; 
GeoPoint p; 

double lattitudeValue; 
double longitudeValue; 
String lattitude; 
String longitude; 
String name; 

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

    // showing MapView 
    MapView mapView = (MapView) findViewById(R.id.mapView); 
    LinearLayout zoomLayout = (LinearLayout) findViewById(R.id.zoom); 
    View zoomView = mapView.getZoomControls(); 
    zoomLayout.addView(zoomView, new LinearLayout.LayoutParams(
      LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
    mapView.displayZoomControls(true); 
    mc = mapView.getController(); 
    String coordinates[] = { "53.5146152", "-2.2857034" }; 
    double lat = Double.parseDouble(coordinates[0]); 
    double lng = Double.parseDouble(coordinates[1]); 
    p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6)); 
    mc.animateTo(p); 
    mc.setZoom(10); 
    mapView.invalidate(); 


    // Parsing JSON value and Read location name, lattitude, longitude from JSON 


    JSONParser jParser = new JSONParser(); 

    JSONObject json = jParser.getJSONFromUrl(url); 
    System.out.println("Testingggg..." + json.length()); 

    try { 

     root = json.getJSONArray(TAG_ROOT); 
     for (int i = 0; i < root.length(); i++) { 
      JSONObject c = root.getJSONObject(i); 
      name=c.getString(TAG_NAME); //Getting location name 
      lattitude = c.getString(TAG_LATTITUDE); //Getting lattitude value in string 
      longitude = c.getString(TAG_LONGITUDE); //Getting longitude value in string 
      lattitudeValue = Double.parseDouble(lattitude); //converting string lattitude value to double 
      longitudeValue=Double.parseDouble(longitude); //converting string longitude value to double 



       List<Overlay> mapOverlays = mapView.getOverlays(); 
      Drawable drawable = this.getResources().getDrawable(
        R.drawable.locationmarker); 
      HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(
        drawable, this); 
      GeoPoint point = new GeoPoint((int) (lattitudeValue * 1E6), 
        (int) (longitudeValue * 1E6)); 
      OverlayItem overlayitem = new OverlayItem(point, name, "I'm in" 
        + name); 

      itemizedoverlay.addOverlay(overlayitem); 
      mapOverlays.add(itemizedoverlay); 



     } 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
} 

@Override 
protected boolean isRouteDisplayed() { 
    // TODO Auto-generated method stub 
    return false; 
} 
} 

CustomItemizedOverlay.java

public class CustomItemizedOverlay extends ItemizedOverlay<OverlayItem> { 

private final ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>(); 

private Context context; 

public CustomItemizedOverlay(Drawable defaultMarker) { 
    super(boundCenterBottom(defaultMarker)); 
} 

public CustomItemizedOverlay(Drawable defaultMarker, Context context) { 
    this(defaultMarker); 
    this.context = context; 
} 

@Override 
protected OverlayItem createItem(int i) { 
    return mapOverlays.get(i); 
} 

@Override 
public int size() { 
    return mapOverlays.size(); 
} 

public void addOverlay(OverlayItem overlay) { 
    mapOverlays.add(overlay); 
    this.populate(); 
} 

}

HelloItemizedOverlay.java

public class HelloItemizedOverlay extends ItemizedOverlay<OverlayItem> { 
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 
private Context mContext; 

public HelloItemizedOverlay(Drawable defaultMarker, Context context) { 
    super(boundCenterBottom(defaultMarker)); 
    mContext = context; 
} 

public void addOverlay(OverlayItem overlay) { 
    mOverlays.add(overlay); 
    populate(); 
} 

@Override 
protected OverlayItem createItem(int i) { 
    return mOverlays.get(i); 
} 

@Override 
public int size() { 
    return mOverlays.size(); 
} 

@Override 
protected boolean onTap(int index) { 
    OverlayItem item = mOverlays.get(index); 
    AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); 
    dialog.setTitle(item.getTitle()); 
    dialog.setMessage(item.getSnippet()); 
    dialog.show(); 
    return true; 
} 
} 

Answer 1

Drawable srcdrawable = getApplicationContext().getResources().getDrawable(R.drawable.pin_blue); 
CustomItemizedOverlay srcitemizedOverlay = new CustomItemizedOverlay(srcdrawable, getApplicationContext()); 
forloop(setoflocations){ 
GeoPoint srcpoint = new GeoPoint((int)(Double.parseDouble(lat) * 1E6),(int)(Double.parseDouble(lng)* 1E6)); 
OverlayItem srcoverlayitem = new OverlayItem(srcpoint, "Hello!", "This is your Location."); 
if(srcitemizedOverlay!=null && mapController!=null){ 
srcitemizedOverlay.addOverlay(overlayitem); 
mapController.animateTo(point); 
animatePoint = point; 
} 
} 
mapView.getOverlays().clear(); 
mapView.getOverlays().add(srcitemizedOverlay); 

den obigen Code in oncreate() verwenden, nachdem Sie der Lage fertig auch unter der unten CustomItemizedOverlay.java Klasse ist

public class CustomItemizedOverlay extends ItemizedOverlay<OverlayItem> { 

    private final ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>(); 

    private Context context; 

    public CustomItemizedOverlay(Drawable defaultMarker) { 
     super(boundCenterBottom(defaultMarker)); 
    } 

    public CustomItemizedOverlay(Drawable defaultMarker, Context context) { 
     this(defaultMarker); 
     this.context = context; 
    } 

    @Override 
    protected OverlayItem createItem(int i) { 
     return mapOverlays.get(i); 
    } 

    @Override 
    public int size() { 
     return mapOverlays.size(); 
    } 

    public void addOverlay(OverlayItem overlay) { 
     mapOverlays.add(overlay); 
     this.populate(); 
    } 

} 

Ref.-Nr. er dies LINK.

Answer 2

ein Overlay Machen Sie den Marker zeigen ..

check this out link

es Ihnen Hoffnung helfen ..