我已经很忙了很长时间,发现如何在HelloMapView中的 map 上的两个(GPS)点之间绘制一条线,但是没有运气。

谁能告诉我该怎么做。

假设我使用扩展MapView的HelloMapView。我需要使用覆盖物吗?如果是这样,我是否必须覆盖叠加层的onDraw()方法并在此处画一条线?我实际上尝试了这些东西,但没有结果。

先感谢您!

最佳答案

谢谢您的帮助。最后我可以在 map 上画一条线。
这是我的方法:

/** Called when the activity is first created. */
private List<Overlay> mapOverlays;

private Projection projection;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

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

    mapOverlays = mapView.getOverlays();
    projection = mapView.getProjection();
    mapOverlays.add(new MyOverlay());

}

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

class MyOverlay extends Overlay{

    public MyOverlay(){

    }

    public void draw(Canvas canvas, MapView mapv, boolean shadow){
        super.draw(canvas, mapv, shadow);

        Paint   mPaint = new Paint();
        mPaint.setDither(true);
        mPaint.setColor(Color.RED);
        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(2);

        GeoPoint gP1 = new GeoPoint(19240000,-99120000);
        GeoPoint gP2 = new GeoPoint(37423157, -122085008);

        Point p1 = new Point();
        Point p2 = new Point();
        Path path = new Path();

        Projection projection=mapv.getProjection();
        projection.toPixels(gP1, p1);
        projection.toPixels(gP2, p2);

        path.moveTo(p2.x, p2.y);
        path.lineTo(p1.x,p1.y);

        canvas.drawPath(path, mPaint);
    }

关于android - 在Google map 上画一条线/路径,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/2176397/

10-10 22:21