在Android中使用ItemizedOverlay添加可見的「標記」以表示使用ItemizedOverlay的MapView地理位置

Question

我正在構建將GPS位置存儲在SQLite數據庫中的應用程序，然後通過在點之間繪製紅線將數據輸出到MapView上。

我希望能夠爲這些點中的每一個以及紅線顯示圖形標記（圖像）。我的代碼如下：

public class MyOverlay extends ItemizedOverlay<OverlayItem> { 

// private Projection projection; 
private Paint linePaint; 
private Vector<GeoPoint> points; 

public MyOverlay(Drawable defaultMarker) { 
    super(defaultMarker); 
    points = new Vector<GeoPoint>(); 
    //set colour, stroke width etc. 
    linePaint = new Paint(); 
    linePaint.setARGB(255, 255, 0, 0); 
    linePaint.setStrokeWidth(3); 
    linePaint.setDither(true); 
    linePaint.setStyle(Style.FILL); 
    linePaint.setAntiAlias(true); 
    linePaint.setStrokeJoin(Paint.Join.ROUND); 
    linePaint.setStrokeCap(Paint.Cap.ROUND); 

} 

public void addPoint(GeoPoint point) { 
    populate(); 
    points.addElement(point); 

} 

//public void setProjection(Projection projection) { 
// this.projection = projection; 
// } 

public void draw(Canvas canvas, MapView view, boolean shadow) { 
    populate(); 
    int size = points.size(); 
    Point lastPoint = new Point(); 
    if(size == 0) return; 
    view.getProjection().toPixels(points.get(0), lastPoint); 
    Point point = new Point(); 
    for(int i = 1; i<size; i++){ 
     view.getProjection().toPixels(points.get(i), point); 
     canvas.drawLine(lastPoint.x, lastPoint.y, point.x, point.y, linePaint); 
     lastPoint = point; 

    } 
} 

@Override 
protected OverlayItem createItem(int arg0) { 
    // TODO Auto-generated method stub 
    return null; 
} 

@Override 
public int size() { 
    // TODO Auto-generated method stub 
    return 0; 
} 
} 

什麼是實現爲每個GeoPoint添加標記最簡單的方法？

Answer 1

看看http://www.vtgroup.com/index.html#MapLocation，看看它是否回答你的問題。