Android：ItemizedOverlay onTouchEvent 和 onTap 重叠

Question

我试图在地图叠加层上放置一个标记，然后在用户选择可绘制对象时显示一个对话框。问题是事件似乎重叠。在我单击地图并绘制标记后，onTap 会立即触发，并且因为我刚刚绘制了标记，所以它位于 onTap 事件的正下方，因此我的对话框始终会触发。有人对如何使这些事件相互排斥有什么建议吗？

以下是地图活动的代码：

public class SelectGameLocation extends MapActivity implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener  {

    private MapView mapView = null;
    private SelectGameLocationItemizedOverlay selectLocationOverlay = null;
    private List<Overlay> mapOverlays = null;
    private GestureDetector gestureDetector = null;

    @Override
    protected void onCreate(Bundle arg0) {
        super.onCreate(arg0);

        //set the layout
        setContentView(R.layout.activity_select_game_location);

        //configure activity for double clicks
        gestureDetector = new GestureDetector(this);
        gestureDetector.setOnDoubleTapListener(this);

        //create and configure mapview
        mapView = (MapView) findViewById(R.id.selectGameLocation);
        mapView.setBuiltInZoomControls(true);
        mapView.setHapticFeedbackEnabled(true);

        //configure the overlay to draw the icons on the map
        mapOverlays = mapView.getOverlays();
        Drawable drawable = this.getResources().getDrawable(R.drawable.map_icon);
        selectLocationOverlay = new SelectGameLocationItemizedOverlay(drawable, this);
        mapOverlays.add(selectLocationOverlay);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        gestureDetector.onTouchEvent(ev);
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onDoubleTap(MotionEvent me) {
        GeoPoint p = GeoPointHelper.getPointClicked(me, mapView);
        mapView.getController().animateTo(p);
        mapView.getController().zoomIn();
        return true;
    }

    //Overridden methods but not used
    @Override
    public boolean onDoubleTapEvent(MotionEvent me) {
        return false;
    }

    @Override
    public boolean onDown(MotionEvent me) {
        return false;
    }

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

    @Override
    public void onShowPress(MotionEvent e) {
    }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent me) {
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        return false;
    }

    @Override
    public boolean onSingleTapUp(MotionEvent me) {
        return false;
    }
}

以及覆盖类的代码：

public class SelectGameLocationItemizedOverlay extends ItemizedOverlay {

    private Context context = null;
    private List<OverlayItem> overlays = new ArrayList<OverlayItem>();

    public SelectGameLocationItemizedOverlay(Drawable marker, Context context) {
        super(boundCenterBottom(marker));
        this.context = context;
    }

    @Override
    protected boolean onTap(int index) {

        OverlayItem itemClicked = overlays.get(index);
        AlertDialog.Builder dialog = new AlertDialog.Builder(context);
        dialog.setTitle(itemClicked.getTitle());
        dialog.setMessage(itemClicked.getSnippet());
        dialog.setCancelable(true);
        dialog.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                Log.i(this.getClass().getName(), "Selected Yes To Add Location");
                ((SelectGameLocation) context).finish();
            }
        });
        dialog.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                Log.i(this.getClass().getName(), "Selected No To Add Location");
                dialog.cancel();
            }
        });
        dialog.show();
        return true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent me, MapView mapView) {
        drawMarker(GeoPointHelper.getPointClicked(me, mapView));
        return super.onTouchEvent(me, mapView);
    }

    private OverlayItem drawMarker(GeoPoint p) {        
            OverlayItem overlayitem = new OverlayItem(p, "Select As Game Location?", "Do you want this location to be added as the location for the game?");
            getOverlays().clear();
            addOverlay(overlayitem);
            return overlayitem;
    }

    public List<OverlayItem> getOverlays() {
        return overlays;
    }

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

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

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

}

Answer 1

我遇到了完全相同的问题，我的 onTouchEvent 在地图上添加了一个标记，并希望它在用户单击它时显示有关该标记的信息，它有效，但它还在其顶部添加了另一个标记。

所以我所做的不是使用 onTouchEvent 而是在 onTap(int index) 和 onTap(Geopoint p, MapView mapView) 中执行所有操作，如下所示：

public boolean onTap (final GeoPoint p, final MapView mapView){
    boolean tapped = super.onTap(p, mapView);
    if (tapped){            
        //do what you want to do when you hit an item           
    }           
    else{
        //do what you want to do when you DON'T hit an item
        }                   
    return true;
}

//Return true in order to say that the listener has correctly taken the event into account 
@Override
protected boolean onTap(int index) {
    return true;
}

问候，

Tom

Answer 2

如果您要更新之前的覆盖层，请在对 `remove() 的调用中设置 isFirst=true; 以删除相关覆盖层。

在 onTap() 调用中，

if(isFirst)
{
    isFirst=false;
} else{
    // the actual onTap() comes here
}

如果在 onDraw() 中设置 isFirst=true，我希望它会发挥相同的作用：出色地。

Answer 3

我认为问题从根本上来说是 onTap 是一个特定的 onTouchEvent，因此如果您在覆盖中写入两者，当您触摸地图时它们都会被触发

您可以尝试在您实现的触摸事件之一中添加一个新的覆盖项目你的mapActivity并将onTap事件留在叠加层中，因为现在

它可能会以这种方式工作，但你必须尝试，我不确定！