小编sau*_*rma的帖子

我收到此错误:The method getSupportFragmentManager() is undefined for the type MainActivity.当我将语句更改为:

SupportMapFragment fm = (SupportMapFragment) getFragmentManager().findFragmentById(R.id.map);

然后我收到这个错误:

Multiple markers at this line
- Cannot cast from Fragment to 
 SupportMapFragment
- Line breakpoint:MainActivity [line: 52] - 
 onCreate(Bundle)

源代码:

 package in.wptrafficanalyzer.proximitymapv2;

import android.app.Activity;
import android.app.Dialog;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color; 
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import …