HelloGoogleMaps - 不下载地图数据

Question

我无法让 HelloGoogleMaps 教程（或我在另一个项目中的实现）在运行时下载地图。它在谷歌地图应用程序中工作正常，但在项目中却不行。到底是怎么回事！

Map

public class Map extends MapActivity {
List<Overlay> mapOverlays;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    MapView mapView = (MapView) findViewById(R.id.mapview);

    mapView.setBuiltInZoomControls(true);
    mapView.setSatellite(true);

    mapOverlays = mapView.getOverlays();

    addLocation(1,19.240000, -99.120000, "Hhola, Mundo!", "I'm in Mexico City!");
    addLocation(2,35.410000, -139.460000, "Sekai, konichiwa!", "I'm in Japan!");

}

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

public void addLocation(int index, double latitude, double longitude, String textPrimary, String textSecondary){

    Drawable drawable = this.getResources().getDrawable(R.drawable.redmarker_a);
    if(index == 2)
        drawable = this.getResources().getDrawable(R.drawable.redmarker_b);
    else if(index == 3)
        drawable = this.getResources().getDrawable(R.drawable.palebluemarker_u);

    ItemizedOverlay itemizedoverlay = new ItemizedOverlay(drawable,getApplicationContext());

    GeoPoint newPoint = new GeoPoint((int)(latitude * 1000000),(int)(longitude * 1000000));
    OverlayItem newOverlayItem = new OverlayItem(newPoint, textPrimary, textSecondary);

    itemizedoverlay.addOverlay(newOverlayItem);
    mapOverlays.add(itemizedoverlay);       
}
}

ItemizedOverlay：

public class ItemizedOverlay extends com.google.android.maps.ItemizedOverlay {

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

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

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

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

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

@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;
    }

}

Manifest

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.apl.example"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="11" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <uses-library android:name="com.google.android.maps" />
        <activity android:name=".Map"
                  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>

    </application>

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

ma​​in.xml

    <?xml version="1.0" encoding="utf-8"?>
<com.google.android.maps.MapView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mapview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:clickable="true"
    android:apiKey="09e81PCxJyJXAblqt5veOmOE7Yy4-X6P5nLKi3Q"
/>

如果我转到 2.3.3 项目，此代码将有效在模拟器中。但我的设备上不是 3.0.1。

Answer 1

还要确保您在清单中添加了互联网的使用权限，如果您在模拟器上进行测试，您需要使用 -dns 8.8.8.8 启动参数启用互联网

抱歉，我确实看到您拥有互联网的权限，但请确保您可以访问如果您使用模拟器，

还请注意，mapapi 密钥与您的“签名”文件（导出步骤，如果您在真实设备上进行测试）相关联，这意味着如果您使用 test.keystore 来创建地图 api 密钥，则创建一个新的密钥库你必须重做地图 api 密钥