L'application Android Map force la fermeture lorsque vous cliquez sur un marqueur de carte

Question

Je suis en train de créer une application google map qui marque plusieurs points sur la carte. J'essaye actuellement d'obtenir la boîte de dialogue pour apparaître quand le marqueur est cliqué. À l'heure actuelle, les marqueurs apparaissent aux bons endroits mais lorsque je les clique, l'application entière s'arrête de manière inattendue/forcée de se fermer. Quelqu'un at-il des suggestions sur ce qui ne va pas et comment je devrais y remédier?

classe MyMapsActivity.java:

package net.learn2develop.MyGoogleMapsNew; 


import java.util.List; 

import android.graphics.drawable.Drawable; 
import android.os.Bundle; 

import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapView; 
import com.google.android.maps.Overlay; 
import com.google.android.maps.OverlayItem; 

public class MyMapsActivity extends MapActivity { 
    /** Called when the activity is first created. */ 

public MyItemOverlay itemoverlay; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     MapView mapView = (MapView) findViewById(R.id.mapview); 
     //MapView = new MapView(this, "example_Maps_ApiKey_String"); 
     mapView.setBuiltInZoomControls(true); 

     List<Overlay> mapOverlays = mapView.getOverlays(); 
     Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker); 
     itemoverlay = new MyItemOverlay(drawable); 

     GeoPoint point1 = new GeoPoint(19240000,-99120000); 
     OverlayItem overlayitem1 = new OverlayItem(point1, "Hola, Mundo!", "I'm in Mexico City!"); 

     GeoPoint point2 = new GeoPoint(35410000, 139460000); 
     OverlayItem overlayitem2 = new OverlayItem(point2, "Sekai, konichiwa!", "I'm in Japan!"); 

     GeoPoint point3 = new GeoPoint(39000000, -77000000); 
     OverlayItem overlayitem3 = new OverlayItem(point3, "",""); 


     itemoverlay.addOverlay(overlayitem1); 
     itemoverlay.addOverlay(overlayitem2); 
     itemoverlay.addOverlay(overlayitem3); 

     mapOverlays.add(itemoverlay); 

    } 

    protected boolean isRouteDisplayed() { 
     return false; 
    } 
} 

classe MyItemOverlay:

package net.learn2develop.MyGoogleMapsNew; 

import java.util.ArrayList; 

import android.app.AlertDialog; 
import android.content.Context; 
import android.graphics.drawable.Drawable; 

import com.google.android.maps.ItemizedOverlay; 
import com.google.android.maps.OverlayItem; 

public class MyItemOverlay extends ItemizedOverlay { 

private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 
private Context mContext; 

public MyItemOverlay(Drawable defaultMarker) { 
    super(boundCenterBottom(defaultMarker)); 
    // TODO Auto-generated constructor stub 
} 

public MyItemOverlay(Drawable defaultMarker, Context context) { 
    super(defaultMarker); 
    mContext = context; 
} 
@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; 
} 

/* 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.setPositiveButton("Yes", new OnClickListener() {  
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       dialog.dismiss(); 
      } 
     }); 
     dialog.show(); 
     return true; 
    } 
}*/ 


// @Override 
/*protected OverlayItem createItem(int arg0) { 
    // TODO Auto-generated method stub 
    return null; 
}*/ 

/*@Override 
public int size() { 
    // TODO Auto-generated method stub 
    return 0; 
}*/ 

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

public void addOverlay(OverlayItem overlay) { 
    mOverlays.add(overlay); 
    populate(); 
} 
@Override 
protected OverlayItem createItem(int i) { 
    return mOverlays.get(i); 
} 


} 

fichier AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="net.learn2develop.MyGoogleMapsNew" 
     android:versionCode="1" 
     android:versionName="1.0"> 
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
    <uses-library android:name="com.google.android.maps" /> 
     <activity android:name=".MyMapsActivity" 
        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> 

    <uses-permission 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:name="android.permission.INTERNET"> 
    </uses-permission> 

    <uses-permission 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:name="android.permission.ACCESS_COARSE_LOCATION"> 
    </uses-permission> 
    <uses-sdk android:minSdkVersion="3" /> 

</manifest> 

Answer 1

changement

itemoverlay = new MyItemOverlay(drawable); 

à

itemoverlay = new MyItemOverlay(drawable, this); 

dans MyMapsActivity.java

Answer 2

En MyMapsActivity.java, vous devez changer:

itemoverlay = new MyItemOverlay(drawable); 

(comme mentionné par Bobby P) à

itemoverlay = new MyItemOverlay(drawable, this); 

ET changez votre deuxième constructeur dans MyItemOverlay.java de:

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

à:

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