how to add multiple map markers in android app - google-maps-android-api-2

Question

i have Google map displayed complete in my app. but the problem is how to add multiple map markers in my app. for different locations? and i am try some coded from here to my problem but not work..
like this
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
}
}

Answer 1

You can call
LatLng latLng = new LatLng(double_lat, double_long);
mMap.addMarker(new MarkerOptions().position(latLng));
how many times you want

Answer 2

If you want to add and show markers on your map there tree good steps to do it :
1 - Create an ARRAYList(MarkerOptions) MarkerList
2 - Create a function that add marker to MarkerList
3- Create a function that add all marker from MarkerList to the map.
After Creating MarkerList , this is addMarkerToList()
public void AddMarkerToList(double latitude,double longitude , String Name)
{
//Add Marker using Object
//we put just latitude and longitude and tilte of the marker
MarkerList.add(new MarkerOptions().position(new LatLng(latitude,longitude)).title(Name));
In the end this is the last function :
public void showMarker()
{
for (int i=0 ;i<MarkerList.size();i++) {
mMap.addMarker(MarkerList.get(i));
}
}