Android Png重疊問題

Question

public PNGOverlay(Bitmap original, GeoPoint topLeftGeoPoint, GeoPoint bottomRightGeoPoint) { 
    this.original = Bitmap.createScaledBitmap(original, original.getWidth(), original.getHeight(), true); 


    ... 
    topGeoPoint = topLeftGeoPoint; 
    bottomGeoPoint = bottomRightGeoPoint; 
} 

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

     Projection projection = mapView.getProjection(); 

     Point leftTop = new Point(); 
     Point rightTop = new Point(); 
     Point rightBottom = new Point(); 
     Point leftBottom = new Point(); 

     projection.toPixels(topGeoPoint, leftTop); 
     projection.toPixels(new GeoPoint(topGeoPoint.getLatitudeE6(), bottomGeoPoint.getLongitudeE6()), rightTop); 
     projection.toPixels(bottomGeoPoint, rightBottom); 
     projection.toPixels(new GeoPoint(bottomGeoPoint.getLatitudeE6(), topGeoPoint.getLongitudeE6()), leftBottom); 

     .... 

     Paint paint = new Paint(); 
     paint.setFilterBitmap(true); 
     paint.setAntiAlias(true); 

     canvas.drawBitmap(original, null, new Rect(leftTop.x, leftTop.y, rightBottom.x, rightBottom.y), paint); 

     .... 
} 

我對這段代碼有問題。當我在mapView上畫出png時，png圖像顯示在指南針上方並顯示在GPS位置指示器上？任何想法？

Answer 1

從你的問題很難猜出你的問題到底是什麼，但是如果你的意思是說PNG正在被其他覆蓋物所覆蓋，並且你希望它被覆蓋在它們之下，你可以通過先添加PNG覆蓋層來解決它到mapview。

mapview.getoverlays().add(overlay1); 
mapview.getoverlays().add(overlay2); 

這導致overlay2上畫出來overlay1：

的MapView由以便你添加它們要求從每個覆蓋draw方法。

mapview.getoverlays().add(overlay2); 
mapview.getoverlays().add(overlay1); 

這導致overlay1被overlay2繪製。

祝你好運。