Question

I implemented the app that displays the map. and it shows the particular location using latitude and longitude. but it shows an empty map.how to see the map. please can anybody help me.

code

public class mapsdemo extends MapActivity
{

MapView mapView;
GeoPoint gp;
MapController mc;

/** Called when the activity is first created. */
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mapView = (MapView) findViewById(R.id.mapView);
    mapView.setBuiltInZoomControls(true);
    mapView.displayZoomControls(true);

    List mapOverlays = mapView.getOverlays();
    Drawable drawable = this.getResources().getDrawable(R.drawable.icon);
    HelloItemizedOverlay itemizedOverlay = new HelloItemizedOverlay(drawable, this);

    double lat = 17.385044;
    double longi = 78.486671;

    gp = new GeoPoint((int) (lat *1E6),(int) (longi *1E6));
    OverlayItem overlayitem =  new OverlayItem(gp, "Hello", "I'm in Hyd");                                                                      
    itemizedOverlay.addOverlay(overlayitem);        
    mapOverlays.add(itemizedOverlay);

    mc = mapView.getController();
    mc.animateTo(gp);
    mc.setZoom(13);
}

@Override
protected boolean isRouteDisplayed() {      
    return false;
}

}

main.xml
< ?xml version="1.0" encoding="utf-8"?>

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

 < com.google.android.maps.MapView
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:apiKey="00YCOT71Vu0btHPPlbIR9uvF0-l4mcAVT9_6HMw"   
                 android:id="@+id/mapView"  
                 android:enabled="true"
                 android:clickable="true"        
                 />
< /LinearLayout>

manifeast

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.maps.demo"
      android:versionCode="1"
      android:versionName="1.0">

    < uses-sdk android:minSdkVersion="7" />

    <uses-permission android:name="android.permission.INTERNET"></uses-permission>

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".mapsdemo"
                  android:label="@string/app_name"
                  android:theme="@android:style/Theme.NoTitleBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <uses-library android:name="com.google.android.maps" />
    </application>
</manifest>

Answer 1

This is most likely caused by a signature mismatch. Make sure that you registered your private key from the keystore used to package your application with Google at the maps API signup page and ensure the key that is issued is in your layout file for the MapView.