无法解析方法getMap()

Question

我试图让我的应用程序中的地图片段工作,并在尝试获取我的GoogleMap对象时继续出错.

FragmentWithMap.java

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;



public class FragmentWithMap extends android.support.v4.app.Fragment {
    private OnFragmentInteractionListener mListener;
    private static final double LAT = 32.084;
    private static final double LON = 34.8878;
    Place place;
    private GoogleMap mMap;
    private View view;
    private Marker marker;
    int userIcon = FragmentWithDetails.userIcon;

    public static FragmentWithMap newInstance(Place place) {
        Bundle args = new Bundle();
        if (place != null) {
            args.putInt("id", place.getId());
            args.putString("name", place.getName());
            args.putString("address", place.getAddress());
            args.putFloat("lat", place.getLat());
            args.putFloat("lng", place.getLng());
        }
        FragmentWithMap fragment = new FragmentWithMap();
        fragment.setArguments(args);
        return fragment;
    }

    public FragmentWithMap() {
        //empty public constructor
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null && getArguments().getString("name") != null) {
            place = new Place(getArguments().getInt("id"), getArguments().getString("name"),
                    getArguments().getString("address"), getArguments().getFloat("lat"),
                    getArguments().getFloat("lng"));
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        if (view == null) {
            view = inflater.inflate(R.layout.fragment_fragment_with_map, container, false);
        }
        setUpMapIfNeeded();
        return view;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        android.support.v4.app.Fragment f = getFragmentManager()
                .findFragmentById(R.id.fragmnet_container_map);
        if (f != null) {
            try {
                getFragmentManager().beginTransaction().remove(f).commit();
            } catch (IllegalStateException ise) {
                Log.d("FragmentWithMap", "Already closed");
            }
        }

        ViewGroup parentViewGroup = (ViewGroup) view.getParent();
        if (parentViewGroup != null) {
            parentViewGroup.removeAllViews();
        }
    }

    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentInteractionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public void showPlace(Place place) {
        setPlace(place);
        setUpMap();
    }

    public void setPlace(Place place) {
        this.place = place;
    }


    public interface OnFragmentInteractionListener {
        public void onFragmentInteraction(Uri uri);
    }

    private void setUpMapIfNeeded() {
        // Do a null check
        if (mMap == null) {
            // Try to obtain the map from the SupportMapFragment.


            Fragment mmm = getChildFragmentManager().findFragmentById(R.id.fragment_map2);
            mMap = ((SupportMapFragment) mmm).getMap();

            // Check if we were successful
            if (mMap != null) {
                setUpMap();
            }
        }
    }

    private void setUpMap() {
        double lat = LAT;
        double lng = LON;
        String name = "You are here";
        if (place != null) {
            lat = place.getLat();
            lng = place.getLng();
            name = place.getName();
        }
        if (marker != null) {
            marker.remove();
        }
        LatLng position = new LatLng(lat, lng);
        MarkerOptions markerOptions = new MarkerOptions().
                position(position).
                title(name).
                icon(BitmapDescriptorFactory.fromResource(userIcon)).
                snippet("Your last recorded location");

        marker = mMap.addMarker(markerOptions);
        if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        mMap.setMyLocationEnabled(true);
        CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(position, 15);
        mMap.animateCamera(cameraUpdate);
    }

}

这是XML

fragment_with_map.xml

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/fragment_map2"
    tools:context="com.example.eldad.myplacesapp.FragmentWithMap"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    />

我从不同的应用程序复制了代码,其中方法getMap()仅被弃用,所以我怀疑问题出在代码本身.我没有被弃用的问题,如果不需要,我不想使用getMapAsync().但出于某种原因,我收到了错误

"无法解析方法'getMap()'"

.我也收到了一个错误

"错误:任务执行失败':app:compileDebugJavaWithJavac'.

编译失败; 有关详细信息,请参阅编译器错误输出.

虽然我不能确定它是否与这个问题有关.

Answer 1

该getMap()方法之前已被弃用,现在已被删除.如果你查看SupportMapFragment的文档,它就不存在了.

您还可以在发行说明中看到:

之前已弃用的getMap()函数在Google Play服务SDK中不再可用.(它仍然可以在提供给Android设备的Google Play服务APK中使用.)自2014年12月以来,不推荐使用getMap()函数.有关从getMap()转换为getMapAsync()的帮助,请参阅发布博客文章.

并从博客文章:

2014年12月,我们弃用了getMap(),转而使用getMapAsync().从此版本开始,您需要使用getMapAsync()来编译您的应用程序.

所以,只需使用getMapAsync(),它很简单.

首先让你的Fragment实现OnMapReadyCallback接口:

public class FragmentWithMap extends android.support.v4.app.Fragment
          implements OnMapReadyCallback { 

然后,修改setUpMapIfNeeded()代码,并添加onMapReady()回调:

private void setUpMapIfNeeded() {
  if (mMap == null) {
    SupportMapFragment mapFrag = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.fragment_map2);
    mapFrag.getMapAsync(this);
  }
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    setUpMap();
}