Mapbox Android SDK – 可拖动标记

我必须为我的一个项目实现可拖动标记.我找到的唯一解决方案是扩展现有的Marker类,同时检查拖动事件并相应地更新标记位置.

package com.example.map;

import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

import com.mapBox.mapBoxsdk.api.ILatLng;
import com.mapBox.mapBoxsdk.geometry.LatLng;
import com.mapBox.mapBoxsdk.overlay.Marker;
import com.mapBox.mapBoxsdk.views.MapView;
import com.mapBox.mapBoxsdk.viewS.Util.Projection;

public class DraggableMarker extends Marker {

    private static final String TAG = "map.DraggableMarker";

    private Boolean mIsDragged;
    private static final RectF mTempRect = new RectF();
    private static final PointF mTempPoint = new PointF();
    private float mDx,mDy;

    public DraggableMarker(String title,String description,LatLng latLng) {
        super(title,description,latLng);
        mIsDragged = false;
    }

    public DraggableMarker(MapView mv,String atitle,String aDescription,LatLng aLatLng) {
        super(mv,atitle,aDescription,aLatLng);
        mIsDragged = false;
    }

    public Boolean drag(View v,MotionEvent event) {
        final int action = event.getActionMasked();
        if(action == MotionEvent.ACTION_DOWN) {
            Projection pj = ((MapView)v).getProjection();
            RectF bound = getDrawingBounds(pj,mTempRect);
            if(bound.contains(event.getX(),event.getY())) {
                mIsDragged = true;
                PointF p = getPositionOnScreen(pj,mTempPoint);
                mDx = p.x - event.getX();
                mDy = p.y - event.getY();
            }
        }
        if(mIsDragged) {
            if((action == MotionEvent.ACTION_CANCEL) ||
                    (action == MotionEvent.ACTION_Up)) {
                mIsDragged = false;
            } else {
                Projection pj = ((MapView)v).getProjection();
                ILatLng pos = pj.fromPixels(event.getX() + mDx,event.getY() + mDy);
                setPoint(new LatLng(pos.getLatitude(),pos.getLongitude()));
            }
        }

        return mIsDragged;
    }
}

稍后您需要在MapView上的触摸事件上添加侦听器,并检查您的标记(或标记集合中的许多标记之一)是否受事件影响.

@H_190_11@mMarker = new DraggableMarker(mMapView,"",aCenter); mMarker.setIcon(new Icon(getActivity().getApplicationContext(),Icon.Size.smaLL,"marker-stroked","FF0000")); mMapView.addMarker(mMarker); mMapView.setOnTouchListener(new View.onTouchListener() { @Override public Boolean onTouch(View v,MotionEvent event) { return mMarker.drag(v,event); } });