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  1. package com.example.maptest;
  2.  
  3. import android.graphics.Canvas;
  4. import android.graphics.Paint;
  5. import android.graphics.Paint.Style;
  6. import android.graphics.Point;
  7. import android.os.Bundle;
  8.  
  9. import com.google.android.maps.GeoPoint;
  10. import com.google.android.maps.MapActivity;
  11. import com.google.android.maps.MapController;
  12. import com.google.android.maps.MapView;
  13. import com.google.android.maps.Overlay;
  14. import com.google.android.maps.Projection;
  15.  
  16. public class MainActivity extends MapActivity {
  17.  
  18.     @Override
  19.     public void onCreate(Bundle savedInstanceState) {
  20.         super.onCreate(savedInstanceState);
  21.         setContentView(R.layout.activity_main);
  22.         MapView mapView = (MapView) findViewById(R.id.map);
  23.         mapView.setClickable(true);
  24.         mapView.setBuiltInZoomControls(true);
  25.         TestOverlay overlay = new TestOverlay();
  26.         mapView.getOverlays().add(overlay);
  27.  
  28.         MapController mc = mapView.getController();
  29.         mc.setZoom(21);
  30.  
  31.         mapView.invalidate();
  32.     }
  33.  
  34.     @Override
  35.     protected boolean isRouteDisplayed() {
  36.         return false;
  37.     }
  38.  
  39.     static class TestOverlay extends Overlay {
  40.         private Paint mPaint = new Paint();
  41.         private Point mPoint1, mPoint2;
  42.  
  43.         @Override
  44.         public void draw(Canvas canvas, MapView mapView, boolean shadow) {
  45.             super.draw(canvas, mapView, shadow);
  46.             if (!shadow) {
  47.                 Projection pj = mapView.getProjection();
  48.                 GeoPoint center1 = mapView.getMapCenter();
  49.                 GeoPoint center2 = new GeoPoint(center1.getLatitudeE6(), center1.getLongitudeE6());
  50.  
  51.                 mPoint1 = pj.toPixels(center1, mPoint1);
  52.                 mPoint2 = pj.toPixels(center2, mPoint2);
  53.  
  54.                 mPaint.setStyle(Style.FILL);
  55.                 mPaint.setColor(0xff0000ff);
  56.                 canvas.drawCircle(mPoint1.x, mPoint1.y, 5, mPaint); // これはちゃんと中心になる
  57.                 mPaint.setColor(0xff00ff00);
  58.                 canvas.drawCircle(mPoint2.x, mPoint2.y, 5, mPaint); // スクロールしてるほどずれる
  59.             }
  60.         }
  61.     }
  62. }
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https://ideone.com/klol4
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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