我的问题是当我放大到更高的水平时，绘图填充区域会消失。
它将非常跟进主题： Android MapView overlay disappearing when zooming in
以上链接解决了我的问题以画线，但填充区域仍然存在同样的问题。
我也需要帮助解决填充区域。
我目前的代码如下：
class MyOverlay extends Overlay {
private final List<GeoPoint> points;
private int oldX;
private int oldY;
public MyOverlay(List<GeoPoint> points) {
this.points = points;
}
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
super.draw(canvas, mapView, shadow);
int x1 = -1;
int y1 = -1;
int x2 = -1;
int y2 = -1;
Paint paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.GREEN);
paint.setStrokeWidth(5);
int size = points.size();
for (int i = 0; i <= size; i++) {
Point point = new Point();
mapView.getProjection().toPixels(points.get(i % size),
point);
x2 = point.x;
y2 = point.y;
if (i > 0) {
canvas.drawLine(x1, y1, x2, y2, paint);
}
x1 = x2;
y1 = y2;
}
//the following are drawing the filled area
paint.setColor(Color.GREEN);
paint.setStyle(Paint.Style.FILL);
paint.setAlpha(60);
Projection projection = mapView.getProjection();
Point p1 = new Point();
Point p2 = new Point();
Point p3 = new Point();
projection.toPixels(gpoint1, p1);
projection.toPixels(gpoint2, p2);
projection.toPixels(gpoint3, p3);
Path path = new Path();
path.moveTo(p1.x, p1.y);
path.lineTo(p2.x, p2.y);
path.lineTo(p3.x, p3.y);
canvas.drawPath(path, paint);
}
}
答案 0 :(得分：1)
您可以从此代码中获得帮助。
public abstract class BalloonItemizedOverlay<Item> extends
ItemizedOverlay<OverlayItem> {
private MapView mapView;
private BalloonOverlayView balloonView;
private View clickRegion;
private int viewOffset;
final MapController mc;
/**
* Create a new BalloonItemizedOverlay
*
* @param defaultMarker
* - A bounded Drawable to be drawn on the map for each item in
* the overlay.
* @param mapView
* - The view upon which the overlay items are to be drawn.
*/
public BalloonItemizedOverlay(Drawable defaultMarker, MapView mapView) {
super(defaultMarker);
this.mapView = mapView;
viewOffset = 0;
mc = mapView.getController();
}
@Override
public void draw(Canvas c, MapView m, boolean shadow) { // for disabling the
// shadow of overlay
super.draw(c, m, false);
}
/**
* Set the horizontal distance between the marker and the bottom of the
* information balloon. The default is 0 which works well for center bounded
* markers. If your marker is center-bottom bounded, call this before adding
* overlay items to ensure the balloon hovers exactly above the marker.
*
* @param pixels
* - The padding between the center point and the bottom of the
* information balloon.
*/
public void setBalloonBottomOffset(int pixels) {
viewOffset = pixels;
}
/**
* Override this method to handle a "tap" on a balloon. By default, does
* nothing and returns false.
*
* @param index
* - The index of the item whose balloon is tapped.
* @return true if you handled the tap, otherwise false.
*/
protected boolean onBalloonTap(int index) {
Globals.mapPinpointTap = true;
return false;
}
/*
* (non-Javadoc)
*
* @see com.google.android.maps.ItemizedOverlay#onTap(int)
*/
@Override
protected final boolean onTap(int index) {
boolean isRecycled;
final int thisIndex;
GeoPoint point;
Globals.mapPinpointTap = true;
thisIndex = index;
point = createItem(index).getPoint();
if (balloonView == null) {
balloonView = new BalloonOverlayView(mapView.getContext(),
viewOffset);
clickRegion = (View) balloonView
.findViewById(R.id.balloon_inner_layout);
isRecycled = false;
} else {
isRecycled = true;
}
balloonView.setVisibility(View.GONE);
List<Overlay> mapOverlays = mapView.getOverlays();
if (mapOverlays.size() > 1) {
hideOtherBalloons(mapOverlays);
}
balloonView.setData(createItem(index));
MapView.LayoutParams params = new MapView.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, point,
MapView.LayoutParams.BOTTOM_CENTER);
params.mode = MapView.LayoutParams.MODE_MAP;
setBalloonTouchListener(thisIndex);
balloonView.setVisibility(View.VISIBLE);
// /
/*
* String url = "http://maps.google.com/maps?q=" +
* (point.getLatitudeE6() / 1E6) + "," + (point.getLongitudeE6() / 1E6);
*/
// String url = "http://iceapp.coeus-solutions.de/api/map?location="
// + (point.getLatitudeE6() / 1E6) + ","
// + (point.getLongitudeE6() / 1E6);
// Intent browserIntent = new Intent(Intent.ACTION_VIEW,
// Uri.parse(url));
// balloonView.getContext().startActivity(browserIntent);
// /
if (isRecycled) {
balloonView.setLayoutParams(params);
} else {
mapView.addView(balloonView, params);
}
mc.animateTo(point);
return true;
}
/**
* Sets the visibility of this overlay's balloon view to GONE.
*/
private void hideBalloon() {
if (balloonView != null) {
balloonView.setVisibility(View.GONE);
}
}
/**
* Hides the balloon view for any other BalloonItemizedOverlay instances
* that might be present on the MapView.
*
* @param overlays
* - list of overlays (including this) on the MapView.
*/
private void hideOtherBalloons(List<Overlay> overlays) {
for (Overlay overlay : overlays) {
if (overlay instanceof BalloonItemizedOverlay<?> && overlay != this) {
((BalloonItemizedOverlay<?>) overlay).hideBalloon();
}
}
}
/**
* Sets the onTouchListener for the balloon being displayed, calling the
* overridden onBalloonTap if implemented.
*
* @param thisIndex
* - The index of the item whose balloon is tapped.
*/
private void setBalloonTouchListener(final int thisIndex) {
try {
@SuppressWarnings("unused")
Method m = this.getClass().getDeclaredMethod("onBalloonTap",
int.class);
Globals.mapPinpointTap = true;
clickRegion.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
View l = ((View) v.getParent())
.findViewById(R.id.balloon_main_layout);
Drawable d = l.getBackground();
if (event.getAction() == MotionEvent.ACTION_DOWN) {
int[] states = { android.R.attr.state_pressed };
if (d.setState(states)) {
d.invalidateSelf();
}
return true;
} else if (event.getAction() == MotionEvent.ACTION_UP) {
int newStates[] = {};
if (d.setState(newStates)) {
d.invalidateSelf();
}
// call overridden method
onBalloonTap(thisIndex);
return true;
} else {
return false;
}
}
});
} catch (SecurityException e) {
if (Globals.SHOW_LOGS)
Log.e("BalloonItemizedOverlay",
"setBalloonTouchListener reflection SecurityException");
return;
} catch (NoSuchMethodException e) {
// method not overridden - do nothing
return;
}
}
}
答案 1 :(得分：0)