你好，我正在开发一个应用程序，在我的应用程序中有一个地图页面，因此我实现了谷歌地图 V2，但遇到了问题：当我滚动地图时，我想获取地图的中心点。也就是说，如果我滚动地图并离开它，则会得到地图的中心点，是否有人能提供解决这个问题的建议？这可能会有所帮助。谢谢。
注意：我使用的是 Google Maps V2，请发布相关内容。
public class Mapview extends FragmentActivity implements OnMapClickListener, OnCameraChangeListener{
final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;
Location myLocation;
TextView tvLocInfo;
GPSTracker gps;
public double Latitude,Longitude;
String Datetime, addr,RegUID;
public String lat,longd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mapview);
tvLocInfo = (TextView)findViewById(R.id.locinfo);
FragmentManager myFragmentManager = getSupportFragmentManager();
SupportMapFragment mySupportMapFragment = (SupportMapFragment)myFragmentManager.findFragmentById(R.id.map);
myMap = mySupportMapFragment.getMap();
myMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
myMap.setMyLocationEnabled(true);
myMap.setOnMapClickListener(this);
Projection P = myMap.getProjection();
Log.e("lat", String.valueOf(Latitude));
Log.e("lat", String.valueOf(Longitude));
Button mDone = (Button) findViewById(R.id.button1);
mDone.setOnClickListener(new View.OnClickListener() {
@SuppressLint("SimpleDateFormat")
public void onClick(View v) {
//Toast.makeText(getBaseContext(), "latitude"+lat+""+"longitude"+longd , Toast.LENGTH_LONG).show();
String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(Calendar.getInstance().getTime());
Datetime = timeStamp.toString();
Log.e("t", Datetime);
RegUID = Utils.RegisterUserId;
Log.e("t", RegUID);
final ProgressDialog dialog = ProgressDialog.show(Mapview.this, "", Utils.Loading, true);
dialog.show();
Handler handler = new Handler();
handler.postDelayed(new Runnable(){
@SuppressWarnings("unused")
public void run()
{
try
{
String EMPLOYEE_SERVICE_URI = Utils.Request+"UserID="+RegUID+"&Location="+URLEncoder.encode(addr,"UTF-8")+"&Latitude="+lat+"&Longitude="+longd+"&RequestDate="+URLEncoder.encode(Datetime,"UTF-8");
Log.e(EMPLOYEE_SERVICE_URI, EMPLOYEE_SERVICE_URI);
JSONObject JObject = Utils.getResult(EMPLOYEE_SERVICE_URI);
//Toast.makeText(Mapview.this,JObject.toString(), Toast.LENGTH_LONG).show();
if(JObject!=null)
{
if(JObject.getBoolean("Valid"))
{
AlertDialog alertDialog = new AlertDialog.Builder(Mapview.this).create();
Utils.callAlert(JObject.getString("Message"), alertDialog);
}
else
{
AlertDialog alertDialog = new AlertDialog.Builder(Mapview.this).create();
Utils.callAlert(JObject.getString("Message"), alertDialog);
}
}
else
{
AlertDialog alertDialog = new AlertDialog.Builder(Mapview.this).create();
Utils.callAlert(JObject.getString("Message"), alertDialog);
}
}
catch (Exception e)
{
//Toast.makeText(Mapview.this,e.toString(), Toast.LENGTH_LONG).show();
Log.e("Exception", e.toString());
}
dialog.dismiss();
}//run() ends
}, 5000);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if (resultCode == ConnectionResult.SUCCESS){
Toast.makeText(getApplicationContext(),
"isGooglePlayServicesAvailable SUCCESS",
Toast.LENGTH_LONG).show();
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
}
}
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
Log.i("test","onScroll");
return false;
}
@Override
public void onMapClick(LatLng point) {
Log.e("lat", String.valueOf(point.latitude));
Log.e("lat", String.valueOf(point.longitude));
Latitude =point.latitude;
Longitude = point.longitude;
lat = String.valueOf(point.latitude);
longd = String.valueOf(point.longitude);
myMap.moveCamera(CameraUpdateFactory.newLatLng(point));
gps = new GPSTracker(Mapview.this);
// check if GPS enabled
if(gps.canGetLocation())
{
Geocoder geoCoder = new Geocoder(getBaseContext(), Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(Latitude, Longitude, 1);
if(addresses != null) {
Address returnedAddress = addresses.get(0);
StringBuilder strReturnedAddress = new StringBuilder("");
for(int i=0; i<returnedAddress.getMaxAddressLineIndex(); i++) {
strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n");
}
addr = new String(strReturnedAddress);
tvLocInfo.setText(addr.toString());
//Toast.makeText(getApplicationContext(), addr.toString(),Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(), "Gps location address is unavailable please try again later",
Toast.LENGTH_LONG).show();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void onCameraChange(CameraPosition arg0) {
// TODO Auto-generated method stub
}
}