android - 如何将 MapsActivity 插入 fragment 容器？

Question

我在默认的 MapsActivity 上有这段代码:

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);
}

这在抽屉导航 MainActivity 上

MapsActivity fragment = new MapsActivity();
    FragmentTransaction fragmentTransaction =
            getSupportFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.fragment_container, fragment);
    fragmentTransaction.commit();

我可以设法使其与其他 fragment 一起使用的第二个代码，但带有 map 的 fragment 除外。有什么问题吗？

Answer 1

如果您想从 Activity 控制 SupportMapFragment，the answer from cricket_007将正常工作。

如果您想要自定义功能，并且希望将其保留在 Fragment 中，您可以创建一个扩展 SupportMapFragment 的 Fragment，例如:

public class MyCustomMapFragment extends SupportMapFragment 
                          implements OnMapReadyCallback {

    private GoogleMap mMap;

    public MyCustomMapFragment () {
    }

    @Override
    public void onResume() {
        super.onResume();

        setUpMapIfNeeded();
    }

    private void setUpMapIfNeeded() {

        if (mMap == null) {
            getMapAsync(this);
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {

        mMap = googleMap;
        mMap.setMyLocationEnabled(true);
        mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        mMap.getUiSettings().setMapToolbarEnabled(false);
    }

}

然后您可以使用 FragmentTransaction 将容器替换为您的自定义 SupportMapFragment:

MyCustomMapFragment fragment = new MyCustomMapFragment();
FragmentTransaction fragmentTransaction =
        getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();