嗨我有这个代码,当我点击地图时会添加一个标记,但如果我重新运行应用程序,标记就会消失。有什么方法可以以某种方式存储标记,然后显示它?我已经阅读了有关共享首选项的内容,但我无法为其提供代码。如何在共享首选项中保存onmapclick操作然后显示?任何人都可以帮助我吗?
gMap.setOnMapClickListener(new GoogleMap.OnMapClickListener(){
@Override
public void onMapClick(LatLng point) {
gMap.addMarker(new MarkerOptions().position(point));
}
});
答案 0 :(得分:2)
如果您仍需要任何帮助,请查看此link。
Marker m = null;
SharedPreferences prefs = null;//Place it before onCreate you can access its values any where in this class
// onCreate method started
prefs = this.getSharedPreferences("LatLng",MODE_PRIVATE);
//Check whether your preferences contains any values then we get those values
if((prefs.contains("Lat")) && (prefs.contains("Lng"))
{
String lat = prefs.getString("Lat","");
String lng = prefs.getString("Lng","");
LatLng l =new LatLng(Double.parseDouble(lat),Double.parseDouble(lng));
gMap.addMarker(new MarkerOptions().position(l));
}
Inside your onMapClick
gMap.setOnMapClickListener(new GoogleMap.OnMapClickListener(){
@Override
public void onMapClick(LatLng point) {
marker = gMap.addMarker(new MarkerOptions().position(point));
/* This code will save your location coordinates in SharedPrefrence when you click on the map and later you use it */
prefs.edit().putString("Lat",String.valueOf(point.latitude)).commit();
prefs.edit().putString("Lng",String.valueOf(point.longitude)).commit();
}
});
删除标记 p>
gMap.setOnMarkerClickListener(new OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker arg0) {
//Your marker removed
marker.remove();
return true;
}
});
如何使用您自己的图片创建自定义标记
// create marker
MarkerOptions marker = new MarkerOptions().position(new LatLng(lat, lng);
// Changing marker icon
marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.your_own_image)));
// adding marker
gMap.addMarker(marker);