>From what i understand mContext is never initialized in your code. Instead of doing
itemizedOverlay = new helloItemizedOverlay(drawable); try, itemizedOverlay = new helloItemizedOverlay(drawable,getcontext); On Sep 12, 3:30 am, rochi <[email protected]> wrote: > hello, I'm having problems with this code: > > http://developer.android.com/resources/tutorials/views/hello-mapview.... > > In main.xml I have: > > <?xml version="1.0" encoding="utf-8"?> > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/ > android" > android:id="@+id/mainlayout" > android:orientation="vertical" > 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:clickable="true" > android:apiKey="myKey" > /> > > </RelativeLayout> > > In the AndroidManifest.xml > > <?xml version="1.0" encoding="utf-8"?> > <manifest xmlns:android="http://schemas.android.com/apk/res/android"; > package="maps.rochi" > android:versionCode="1" > android:versionName="1.0"> > <uses-sdk android:minSdkVersion="13" /> > > <uses-permission android:name="android.permission.INTERNET" /> > > <application android:icon="@drawable/icon" android:label="@string/ > app_name"> > > <uses-library android:name="com.google.android.maps" /> > > <activity android:name=".MapsActivity" > android:label="@string/app_name"> > <intent-filter> > <action android:name="android.intent.action.MAIN" /> > <category > android:name="android.intent.category.LAUNCHER" /> > </intent-filter> > </activity> > > </application> > > </manifest> > > In mapsActivity.java: > > public class MapsActivity extends MapActivity { > > LinearLayout linearLayout; > MapView mapView; > MapController mapController; > > List<Overlay> mapOverlays; > Drawable drawable; > helloItemizedOverlay itemizedOverlay; > > protected boolean isRouteDisplayed() { > return false; > } > > /** Called when the activity is first created. */ > @Override > public void onCreate(Bundle savedInstanceState) { > super.onCreate(savedInstanceState); > setContentView(R.layout.main); > > mapView = (MapView) findViewById(R.id.mapview); > mapView.setBuiltInZoomControls(true); > > mapController = mapView.getController(); > > mapOverlays = mapView.getOverlays(); > drawable = > this.getResources().getDrawable(R.drawable.bikeicon); > itemizedOverlay = new helloItemizedOverlay(drawable); > > GeoPoint point = new GeoPoint(19240000,-99120000); > OverlayItem overlayitem = new OverlayItem(point, "Hola, > Mundo!", "I'm in Mexico City!"); > > itemizedOverlay.addOverlay(overlayitem); > > mapOverlays.add(itemizedOverlay); > > } > > } > > And helloItemizedOverlay: > > public class helloItemizedOverlay extends ItemizedOverlay { > > Context mContext = null; > private ArrayList<OverlayItem> mOverlays = new > ArrayList<OverlayItem>(); > > public helloItemizedOverlay(Drawable marker) { > super(boundCenterBottom(marker)); > > } > > public void addOverlay(OverlayItem overlay) { > mOverlays.add(overlay); > populate(); > } > > @Override > protected OverlayItem createItem(int i) { > return mOverlays.get(i); > } > > @Override > public int size() { > // TODO Auto-generated method stub > return mOverlays.size(); > } > > public helloItemizedOverlay(Drawable defaultMarker, Context > context) { > super(defaultMarker); > mContext = context; > } > > @Override > protected boolean onTap(int index){ > OverlayItem item = mOverlays.get(index); > try{ > AlertDialog.Builder dialog = new > AlertDialog.Builder(mContext); > dialog.setTitle(item.getTitle()); > dialog.setMessage(item.getSnippet()); > dialog.show(); > } catch (Exception e){ > e.printStackTrace(); > } > > return true; > } > > } > > When I click in some icon, I found a nullPointerException in this > line AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); > > what's my mistake??? > > Thank you so much! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
