Re: [請益] 請問關於Android程式 螢幕座標轉Map座標

[meya (落寞之心)]

※ 引述《barry198744 (小豪)》之銘言：
: 請問一下唷~
: 一般的在Google Map上的應用，多半都是GeoPoint的座標轉成螢幕的Poxels座標，
: 然後畫圖在螢幕上，可是今天我想要反過來，就是我用手去碰觸螢幕上的地圖，然
: 後抓出地圖上被我碰到的點的座標是多少，這樣的話我應該怎樣做呢><~
: 感謝!!


http://www.anddev.org/viewtopic.php?p=28140

@Override
public void onCreate(Bundle icicl){
.............
.............
OnTouchListener myOnTouchListener=new OnTouchListener(){
public boolean onTouch(View mapView,MotionEvent m){
int action=m.getAction();
switch(action){
case MotionEvent.ACTION_UP:
int x=(int)m.getX();
int y=(int)m.getY();
double latspan=(myMapView.getLatitudeSpan()/1.0E6);
double lngspan=(myMapView.getLongitudeSpan()/1.0E6);
GeoPoint center=myMapView.getMapCenter();
double xpcent=(x/(double)myMapView.getWidth());
double ypcent=(y/(double)myMapView.getHeight());
double lat0=(center.getLatitudeE6()/1.0E6+(latspan/2.0));
double lng0=(center.getLongitudeE6()/1.0E6-(lngspan/2.0));
double lat=lat0-(ypcent*latspan);
double lng=lng0+(xpcent*lngspan);
Log.i("x=",""+x);
Log.i("y=",""+y);
GeoPoint newpoint=new GeoPoint((int)(lat*1E6),(int)(lng*1E6));
// myMapView.getController().zoomOut();

Log.i("Map","Height"+myMapView.getHeight());
Log.i("Map","width"+myMapView.getWidth());
Log.i("Current","LatitudeSpane"+myMapView.getLatitudeSpan());
Log.i("Current","LongitudeSpan"+myMapView.getLongitudeSpan());
Log.i("center Longitude","is"+newpoint.getLongitudeE6());
Log.i("center","Latitude is"+newpoint.getLatitudeE6());
Log.i("new ","latitude "+lat);
Log.i("new","longitude "+lng);


Log.i("background","is"+myMapView.getBackground());
Log.i("Zoom in","works");

myMapView.invalidate();
mc.animateTo(newpoint);

mc.zoomIn();

break;

}
return false;
}
};
myMapView.setOnTouchListener(myOnTouchListener);
......
.....
}

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