0

我在我的应用程序中使用 URL https://github.com/jgilfelt/android-mapviewballoons提供的源代码。它使用 url 显示图像。但是如何让它从我的应用程序的可绘制文件夹中加载图像？

我找到了这个MapViewurl，它在气球中显示图像。但它显示来自 url 的图像，因为我想从文件夹中显示我自己的图像。我该如何做到这一点？

代码：

    public class CustomMap extends MapActivity {

MapView mapView;
List<Overlay> mapOverlays;
Drawable drawable;
Drawable drawable2;
CustomItemizedOverlay<CustomOverlayItem> itemizedOverlay;
CustomItemizedOverlay<CustomOverlayItem> itemizedOverlay2;

@Override
    public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

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

    mapOverlays = mapView.getOverlays();

    // first overlay
    drawable = getResources().getDrawable(R.drawable.marker);
    itemizedOverlay = new CustomItemizedOverlay<CustomOverlayItem>(drawable,  
   mapView);

    GeoPoint point = new GeoPoint((int)(51.5174723*1E6),(int)(-0.0899537*1E6));
    CustomOverlayItem overlayItem = new CustomOverlayItem(point,  
   "Tomorrow      Never Dies (1997)", 
            "(M gives Bond his mission in Daimler car)", 
            "http://ia.media-imdb.com/images 
  /M/MV5BMTM1MTk2ODQxNV5BMl5BanBnXkFtZTcwOTY5MDg0NA@@._V1._SX40_CR0,0,40,54_.jpg");
    itemizedOverlay.addOverlay(overlayItem);

    GeoPoint point2 = new GeoPoint((int)(51.515259*1E6),(int)(-0.086623*1E6));
    CustomOverlayItem overlayItem2 = new CustomOverlayItem(point2, 
   "GoldenEye   (1995)", 
            "(Interiors Russian defence ministry council chambers in 
  St Petersburg)", 
            "http://ia.media-imdb.com/images   

  M/MV5BMzk2OTg
  4MTk1NF5BMl5BanBnXkFtZTcwNjExNTgzNA@@._V1._SX40_CR0,0,40,54_.jpg");


    itemizedOverlay.addOverlay(overlayItem2);

    mapOverlays.add(itemizedOverlay);

    // second overlay
    drawable2 = getResources().getDrawable(R.drawable.marker2);
    itemizedOverlay2 = new CustomItemizedOverlay<CustomOverlayItem>
    (drawable2,   mapView);

    GeoPoint point3 = new GeoPoint((int)(51.513329*1E6),(int)(-0.08896*1E6));
    CustomOverlayItem overlayItem3 = new CustomOverlayItem(point3, "Sliding 
  Doors (1998)", 
            "(interiors)", null);
    itemizedOverlay2.addOverlay(overlayItem3);

    GeoPoint point4 = new GeoPoint((int)(51.51738*1E6),(int)(-0.08186*1E6));
    CustomOverlayItem overlayItem4 = new CustomOverlayItem(point4, "Mission: 
  Impossible (1996)", 
            "(Ethan & Jim cafe meeting)", 
            "http://ia.media-imdb.com/images 
    /M/MV5BMjAyNjk5Njk0MV
      5BMl5BanBnXkFtZTcwOTA4MjIyMQ@@._V1._SX40_CR0,0,40,54_.jpg");      
    itemizedOverlay2.addOverlay(overlayItem4);

    mapOverlays.add(itemizedOverlay2);

    final MapController mc = mapView.getController();
    mc.animateTo(point2);
    mc.setZoom(16);

}

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

   }
4

2 回答 2

0

这就是您将图像添加为地图叠加层的方式

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;

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

public class DrawableMapOverlay extends Overlay {

  private static final double MAX_TAP_DISTANCE_KM = 3;
  // Rough approximation - one degree = 50 nautical miles
  private static final double MAX_TAP_DISTANCE_DEGREES = MAX_TAP_DISTANCE_KM * 0.5399568 * 50;
  private final GeoPoint geoPoint;
  private final Context context;
  private final int drawable;

  /**
   * @param context the context in which to display the overlay
   * @param geoPoint the geographical point where the overlay is located
   * @param drawable the ID of the desired drawable
   */
  public CamerasMapOverlay(Context context, GeoPoint geoPoint, int drawable) {
    this.context = context;
    this.geoPoint = geoPoint;
    this.drawable = drawable;
  }

  @Override
  public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) {
    super.draw(canvas, mapView, shadow);

    // Convert geo coordinates to screen pixels
    Point screenPoint = new Point();
    mapView.getProjection().toPixels(geoPoint, screenPoint);

    // Read the image
    Bitmap markerImage = BitmapFactory.decodeResource(context.getResources(), drawable);

    // Draw it, centered around the given coordinates
    canvas.drawBitmap(markerImage,
        screenPoint.x - markerImage.getWidth() / 2,
        screenPoint.y - markerImage.getHeight() / 2, null);
    return true;
  }

  @Override
  public boolean onTap(GeoPoint p, MapView mapView) {
    // Handle tapping on the overlay here
    return true;
  }
}

在具有您的 MapView 的活动中：

    MapView map = (MapView) findViewById(R.id.mapview);
    MapController mapController = map.getController();
    List<Overlay> overlays = map.getOverlays();
    overlays.add(new DrawableMapOverlay(this, point, R.drawable.my_drawable);
    map.invalidate();
Editors

看看这个教程..

于 2012-11-27T11:07:55.217 回答
0

你不能。因为这个 R.drawable。*值由 android sdk 在您将新图像添加到文件夹时创建。这意味着，它们不是在您的应用程序运行时创建的，您无法添加新的。

取而代之的是，您可以将图像保存到 forlder 并将它们的方式和名称保存到您的数据库中。

于 2012-11-27T11:09:55.530 回答