错误：MapFragment 无法将“android.support.v4.app.Fragment”转换为“com.google.android.gms.maps.SupportMapFragment”

Question

我在创建现有的 Google 地图活动时遇到了麻烦，尽管我昨天刚刚使用此 Google 地图活动成功构建了应用程序，但我检查了这个项目和我昨天创建的项目，但没有什么不同。如何解决这个问题？

这是 MapsActivity.class

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
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 implements OnMapReadyCallback {

    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

这里是activity_maps.xml

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:map="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/map"
 android:name="com.google.android.gms.maps.SupportMapFragment"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MapsActivity" />

这里是错误： 不可转换的类型；无法将“android.support.v4.app.Fragment”转换为“com.google.android.gms.maps.SupportMapFragment”

Answer 1

你好，我可以用这段代码解决：

import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.SupportMapFragment;


public class MainActivity extends AppCompatActivity
        implements OnMapReadyCallback {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Retrieve the content view that renders the map.
        setContentView(R.layout.activity_main);
        // Get the SupportMapFragment and request notification
        // when the map is ready to be used.
        MapFragment mapFragment = (MapFragment) getFragmentManager()
                .findFragmentById(R.id.map);

        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {

    }
}