Android MapView在触摸屏上添加图钉
我设法把地图显示在屏幕上。现在,用户将在地图周围移动并按下它。按下一个点后,我需要在屏幕上的按下位置添加一个图钉。如果用户决定转到另一个点,当按下所选点时,第一个图钉将消失,并在新位置绘制一个新图钉 我喜欢这样:Android MapView在触摸屏上添加图钉,android,android-mapview,pushpin,Android,Android Mapview,Pushpin,我设法把地图显示在屏幕上。现在,用户将在地图周围移动并按下它。按下一个点后,我需要在屏幕上的按下位置添加一个图钉。如果用户决定转到另一个点,当按下所选点时,第一个图钉将消失,并在新位置绘制一个新图钉 我喜欢这样: public class LocationSelectionActivity extends MapActivity { GeoPoint p; List<Overlay> listOfOverlays; MapOverlay map
public class LocationSelectionActivity extends MapActivity
{
GeoPoint p;
List<Overlay> listOfOverlays;
MapOverlay mapOverlay;
private MapView mapView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.locationselection);
mapView = (MapView) findViewById(R.id.mapView);
mapView.setSatellite(false);
final MapController mc = mapView.getController();
String coordinates[] = {"46.540606", "22.454542"};
double lat = Double.parseDouble(coordinates[0]);
double lng = Double.parseDouble(coordinates[1]);
p = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
mc.animateTo(p);
mc.setZoom(10);
ZoomControls zoomControls = (ZoomControls) findViewById(R.id.zoomcontrols);
zoomControls.setOnZoomInClickListener(new View.OnClickListener() {
public void onClick(View v) {
mc.zoomIn();
}
});
zoomControls.setOnZoomOutClickListener(new View.OnClickListener() {
public void onClick(View v) {
mc.zoomOut();
}
});
//---Add a location marker---
mapOverlay = new MapOverlay();
listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
mapView.invalidate();
}
class MapOverlay extends com.google.android.maps.Overlay
{
@Override
public boolean draw(Canvas canvas, MapView mapView,
boolean shadow, long when)
{
super.draw(canvas, mapView, shadow);
//---translate the GeoPoint to screen pixels---
Point screenPts = new Point();
mapView.getProjection().toPixels(p, screenPts);
//---add the marker---
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.map_flag);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y-48, null);
return true;
}
@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
//---when user lifts his finger---
if (event.getAction() == 1) {
GeoPoint p = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
Toast.makeText(getBaseContext(),
p.getLatitudeE6() / 1E6 + "," +
p.getLongitudeE6() /1E6 ,
Toast.LENGTH_SHORT).show();
}
return false;
}
}
公共类LocationSelectionActivity扩展了MapActivity
{
地质点p;
概述清单;
地图覆盖;
私有地图视图;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.locationselection);
mapView=(mapView)findViewById(R.id.mapView);
mapView.setSatellite(假);
最终的MapController mc=mapView.getController();
字符串坐标[]={“46.540606”,“22.454542”};
double lat=double.parseDouble(坐标[0]);
double lng=double.parseDouble(坐标[1]);
p=新的地质点(
(内部)(纬度*1E6),
(国际)(液化天然气*1E6));
司马迁(p),;
mc.setZoom(10);
ZoomControl ZoomControl=(ZoomControl)findViewById(R.id.ZoomControl);
ZoomControl.setOnZoomInClickListener(新视图.OnClickListener()){
公共void onClick(视图v){
mc.zoomIn();
}
});
ZoomControl.setOnZoomOutClickListener(新视图.OnClickListener()){
公共void onClick(视图v){
mc.zoomOut();
}
});
//---添加位置标记---
mapOverlay=新的mapOverlay();
ListoForLays=mapView.getOverlays();
listOfOverlays.clear();
添加(映射覆盖);
mapView.invalidate();
}
类MapOverlay扩展了com.google.android.maps.Overlay
{
@凌驾
公共布尔绘制(画布、地图视图、地图视图、,
布尔阴影(长时)
{
super.draw(画布、地图视图、阴影);
//---将地质点转换为屏幕像素---
点屏幕PTS=新点();
getProjection().toPixels(p,screenPts);
//---添加标记---
位图bmp=BitmapFactory.decodeResource(getResources(),R.drawable.map_标志);
canvas.drawBitmap(bmp,screenPts.x,screenPts.y-48,null);
返回true;
}
@凌驾
公共布尔onTouchEvent(MotionEvent事件,MapView MapView)
{
//---当用户抬起手指时---
如果(event.getAction()==1){
地理点p=mapView.getProjection().fromPixels(
(int)event.getX(),
(int)event.getY();
Toast.makeText(getBaseContext(),
p、 getLatitudeE6()/1E6+“,”+
p、 getLongitudeE6()/1E6,
吐司。长度(短)。show();
}
返回false;
}
}
这将绘制初始图钉(地图标志资源)。当单击地图时,我将与合作者一起获得土司…剩下要做的就是重新单击,删除旧图钉并添加新图钉
但是怎么做呢?我会使用
ItemizedOverlay
,而不是常规的Overlay
。然后,您需要做的就是更新OverlayItem
对象的集合,并在ItemizedOverlay
上调用populate()
@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
//---when user lifts his finger---
if (event.getAction() == 1) {
p = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
Toast.makeText(getBaseContext(),
p.getLatitudeE6() / 1E6 + "," +
p.getLongitudeE6() /1E6 ,
Toast.LENGTH_SHORT).show();
}
return false;
}
此处显示使用ItemizedOverlay
拖放管脚
@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
//---when user lifts his finger---
if (event.getAction() == 1) {
p = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
Toast.makeText(getBaseContext(),
p.getLatitudeE6() / 1E6 + "," +
p.getLongitudeE6() /1E6 ,
Toast.LENGTH_SHORT).show();
}
return false;
}
这将起作用。公开OnTouchEvent的地质点…此代码工作正常
@Override
public boolean onTap(GeoPoint p, MapView mapView) {
Log.d("tap event ", "tap called");
mapOverlays = mapView.getOverlays();
drawable =getResources().getDrawable(R.drawable.marker);
itemizedOverlay = new SitesOverlay(drawable);
int lat=(int)p.getLatitudeE6();
int lng=(int)p.getLongitudeE6();
GeoPoint point = new GeoPoint(lat,lng);
Log.d("tap event ", "tapcalled"+lat+""+lng);
OverlayItem overlayitem = new OverlayItem(point, "", "");
items.add(overlayitem);
populate();
Log.d("tap event ", "populated");
// mapOverlays.add(itemizedOverlay);
return true;
}
你好,我想在搜索这个地方时得到一分,但我想做的是,如果我想通过选择那个点来改变靠近那个地方的地方,我该怎么做?你能帮我吗