3

我mapview在我的 android 应用程序中使用的类com.google.android.maps 我不会在用户导航时使用后台进程加载标记我想将视口坐标发送到我的服务器我可以像这里一样在 javascript 中做到这一点

 google.maps.event.addListener(map, 'idle', showMarkers);
  function showMarkers() {
var bounds = map.getBounds();

// Call you server with ajax passing it the bounds

// In the ajax callback delete the current markers and add new markers

}

但是我怎么能在java中做到这一点？请建议。

4

1 回答 1

3

我发布了这个答案，我希望节省一些时间

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.MotionEvent;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;




public class SimpleMapView extends MapView {

    private int currentZoomLevel = -1;
    private GeoPoint currentCenter;
    private List<ZoomChangeListener> zoomEvents = new ArrayList<ZoomChangeListener>();
    private List<PanChangeListener> panEvents = new ArrayList<PanChangeListener>();

    public SimpleMapView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public SimpleMapView(Context context, String apiKey) {
        super(context, apiKey);
    }

    public SimpleMapView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    /**
     * 
     * @return
     */
    public int[][] getBounds() {

        GeoPoint center = getMapCenter();
        int latitudeSpan = getLatitudeSpan();
        int longtitudeSpan = getLongitudeSpan();
        int[][] bounds = new int[2][2];

        bounds[0][0] = center.getLatitudeE6() - (latitudeSpan / 2);
        bounds[0][1] = center.getLongitudeE6() - (longtitudeSpan / 2);

        bounds[1][0] = center.getLatitudeE6() + (latitudeSpan / 2);
        bounds[1][1] = center.getLongitudeE6() + (longtitudeSpan / 2);
        return bounds;
    }

    public boolean onTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_UP) {
            GeoPoint centerGeoPoint = this.getMapCenter();
            if (currentCenter == null || 
                    (currentCenter.getLatitudeE6() != centerGeoPoint.getLatitudeE6()) ||
                    (currentCenter.getLongitudeE6() != centerGeoPoint.getLongitudeE6()) ) {
                firePanEvent(currentCenter, this.getMapCenter());
            }
            currentCenter = this.getMapCenter();
        }
        return super.onTouchEvent(ev);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        if(getZoomLevel() != currentZoomLevel){
            fireZoomLevel(currentZoomLevel, getZoomLevel());
            currentZoomLevel = getZoomLevel();
        }
    }

    @Override
    public void setSatellite(boolean on){
        super.setSatellite(on);
    }

    @Override
    public MapController getController(){
        return super.getController();
    }

    private void fireZoomLevel(int old, int current){
        for(ZoomChangeListener event : zoomEvents){
            event.onZoom(old, current);
        }
    }

    private void firePanEvent(GeoPoint old, GeoPoint current){
        for(PanChangeListener event : panEvents){
            event.onPan(old, current);
        }
    }

    public void addZoomChangeListener(ZoomChangeListener listener){
        this.zoomEvents.add(listener);
    }

    public void addPanChangeListener(PanChangeListener listener){
        this.panEvents.add(listener);
    }
}

并在您的地图活动中制作

 SimpleMapView mapView = (SimpleMapView) findViewById(R.id.mapView);

然后你有

    mapView.addPanChangeListener(new PanChangeListener() {

    @Override
    public void onPan(GeoPoint old, GeoPoint current) {
                  //TODO
              //do your work here 

                }
});

并在此处添加 PanChangeListener 类的代码

package yourPkageName;

import com.google.android.maps.GeoPoint;

public interface PanChangeListener {
    public void onPan(GeoPoint old, GeoPoint current);
}

并在此处添加 ZoomChangeListener 类的代码

package yourPkageName;

public interface ZoomChangeListener {
    public void onZoom(int old, int current);
}

并在您的 xml 文件中添加

<?xml version="1.0" encoding="utf-8"?>

<YourPakageName.SimpleMapView   xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mapView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:apiKey="0mAbU5bZyFY2I46PFJ1ysXGcYlAmFM6fYBWSB7Q"
    android:clickable="true" />
于 2012-11-04T09:29:41.913 回答