android中的mapview上看不到多个overlayitems

时间:2011-08-11 10:51:16

标签: android android-mapview

这是我在Activity中使用的代码,用于在mapview上显示多个标记。 我使用了一个自定义覆盖类,它扩展了逐项覆盖。以下是该类的代码:

public class view1CustomOverlays extends ItemizedOverlay<OverlayItem> {

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

    boolean isClickable = false;
    Context context = null;
    Drawable orangeMarker = null;

    public view1CustomOverlays(Drawable defaultMarker, Context c,
            boolean isActive, Drawable inActiveMarker) {
        super(boundCenterBottom(defaultMarker));
        context = c;
        isClickable = isActive;
        orangeMarker = inActiveMarker;
    }

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

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

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

我在主UI活动中使用此类。以下是我使用此类为我的mapview添加叠加层的方法:

更新

private void view1LoadDataOnMap(String[] poleCord) {
    try {
        Drawable redFlag = getResources().getDrawable(R.drawable.red);
        Drawable greenFlag = getResources().getDrawable(R.drawable.green);
        Drawable orangeFlag = getResources().getDrawable(R.drawable.orange);
        int noOfPoles = poleCord.length / 4;
        List<Overlay> list = map.getOverlays();
        list.clear();
        view1CustomOverlays customOverlay = null;
        for (int i = 0; i < noOfPoles; i=i+4) {
            Float lat = Float.parseFloat(poleCord[i]);
            Float lng = Float.parseFloat(poleCord[i+1]);
            String poleNumber = poleCord[i+2];
            String ticketId = poleCord[i+3];
            customOverlay = new view1CustomOverlays(greenFlag, this, true,
                    orangeFlag);
            GeoPoint p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
            OverlayItem overlayItem = new OverlayItem(p, poleNumber, null);
            customOverlay.addOverlay(overlayItem);
            Log.i("adding overlay",overlayItem.toString());
        }
        list.add(customOverlay);
    } catch (NumberFormatException e) {
        e.printStackTrace();
    } catch (NotFoundException e) {
        e.printStackTrace();
    }

}

屏幕上只显示一个叠加层。可能是什么问题呢。我已经检查过我的班级中添加了几个叠加项,但是当我将该类添加到我的mapview时,只会绘制一个叠加层。

我需要在地图上添加总共81个标记。所以我制作81个叠加项并将它们添加到叠加层并在最后添加叠加层。

提前谢谢。

2 个答案:

答案 0 :(得分:0)

你错过了:

myMap.getOverLays().add(customOverlay);

private void view1LoadDataOnMap(String[] poleCord) {
    try {
        Drawable redFlag = getResources().getDrawable(R.drawable.red);
        Drawable greenFlag = getResources().getDrawable(R.drawable.green);
        Drawable orangeFlag = getResources().getDrawable(R.drawable.orange);
        int noOfPoles = poleCord.length / 4;
        List<Overlay> list = map.getOverlays();
        list.clear();
        view1CustomOverlays customOverlay = null;
        for (int i = 0; i < noOfPoles; i++) {
            Float lat = Float.parseFloat(poleCord[0]);
            Float lng = Float.parseFloat(poleCord[1]);
            String poleNumber = poleCord[2];
            String ticketId = poleCord[3];
            customOverlay = new view1CustomOverlays(greenFlag, this, true,
                    orangeFlag);
            GeoPoint p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
            OverlayItem overlayItem = new OverlayItem(p, poleNumber, null);
            customOverlay.addOverlay(overlayItem);
            myMap.getOverLays().add(customOverlay);
            Log.i("adding overlay",overlayItem.toString());
        }
        list.add(customOverlay);
    } catch (NumberFormatException e) {
        e.printStackTrace();
    } catch (NotFoundException e) {
        e.printStackTrace();
    }

}

答案 1 :(得分:0)

无论noOfPoles如何,你都会继续添加元素0,1,2和3.你可能有多个标记,但它们都在同一个地方。你需要使它成为'i'

的功能

for (int i = 0; i < noOfPoles; i++) {
            Float lat = Float.parseFloat(poleCord[ i * 4]);
            Float lng = Float.parseFloat(poleCord[i * 4 + 1]);
            String poleNumber = poleCord[i * 4 + 2];
            String ticketId = poleCord[i * 4 + 3];
            ....
}