Nullpointerexceptionについて

前提・実現したいこと

下記のfragmentのコードでmapFragment.getMapAsync(this);のあとの行の何も書いてないとこと startLocation();のところでエラーが起きています

発生している問題・エラーメッセージ

error
12020-01-26 13:36:57.826 18887-18887/com.example.sharemap2 E/AndroidRuntime: FATAL EXCEPTION: main
2    Process: com.example.sharemap2, PID: 18887
3    java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
4        at com.example.sharemap2.fragment_upload_root.startLocation(fragment_upload_root.java:105)
5        at com.example.sharemap2.fragment_upload_root.onActivityCreated(fragment_upload_root.java:89)

該当のソースコード

fragment
1package com.example.sharemap2;
2
3import android.Manifest;
4import android.app.Activity;
5import android.content.Context;
6import android.content.pm.PackageManager;
7import android.graphics.Color;
8import android.location.Criteria;
9import android.location.Location;
10import android.location.LocationListener;
11import android.location.LocationManager;
12import android.location.LocationProvider;
13import android.os.Bundle;
14
15import androidx.annotation.NonNull;
16import androidx.annotation.Nullable;
17import androidx.core.app.ActivityCompat;
18import androidx.fragment.app.Fragment;
19
20import android.util.Log;
21import android.view.LayoutInflater;
22import android.view.View;
23import android.view.ViewGroup;
24import android.widget.Button;
25import android.widget.CompoundButton;
26import android.widget.TextView;
27
28import com.google.android.gms.location.FusedLocationProviderClient;
29import com.google.android.gms.location.LocationServices;
30import com.google.android.gms.maps.CameraUpdateFactory;
31import com.google.android.gms.maps.GoogleMap;
32import com.google.android.gms.maps.MapView;
33import com.google.android.gms.maps.OnMapReadyCallback;
34import com.google.android.gms.maps.SupportMapFragment;
35import com.google.android.gms.maps.model.LatLng;
36import com.google.android.gms.maps.model.PolylineOptions;
37import com.google.android.material.bottomnavigation.BottomNavigationView;
38
39import java.util.ArrayList;
40import java.util.List;
41
42
43public class fragment_upload_root extends Fragment implements OnMapReadyCallback, LocationListener,
44        View.OnClickListener,CompoundButton.OnCheckedChangeListener {
45
46    private static LocationManager locationmanager1;
47    private static GoogleMap mMap;
48    private MapView mapView;
49    private static final int LOCATION_CODE = 100;
50    private static final String[] LOCATION_PERMISSION = {
51            Manifest.permission.ACCESS_FINE_LOCATION,
52            Manifest.permission.ACCESS_COARSE_LOCATION
53    };
54    private static final int GRANTED = PackageManager.PERMISSION_GRANTED;
55    private List<LatLng> mRunList = new ArrayList<LatLng>();
56    private LatLng latlong, latlong2;
57    private static Location location1;
58    private static Button mButton;
59
60
61    @Override
62    public View onCreateView(LayoutInflater inflater, ViewGroup container,
63                             Bundle savedInstanceState) {
64        return inflater.inflate(R.layout.fragment_upload, container, false);
65    }
66
67    @Override
68    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
69        super.onActivityCreated(savedInstanceState);
70        locationmanager1 = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
71
72        try {
73            if(locationmanager1 != null) {
74                Log.d("a","OK-reach-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
75            } else {
76                throw new NullPointerException();
77            }
78        } catch(NullPointerException e) {
79            e.printStackTrace();
80        }
81
82
83        if (ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[0]) != GRANTED &&
84                ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[1]) != GRANTED) {
85            // ↓「アクセスを許可しますか？」
86            requestPermissions(LOCATION_PERMISSION, LOCATION_CODE);
87        } else {
88            //許可されたら位置取得
89            //下の行にNull
90            startLocation();
91        }
92
93    }
94
95    //許可されたら位置取得、のところ
96    void startLocation() {
97        if (ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[0]) == GRANTED ||
98                ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[1]) == GRANTED) {
99
100            // 許可を得られたことを確認できた段階で初めてsetContentView()を呼ぶ
101            // onMapReady()が走るのはこれ以後になる
102
103            //FusedLocationProviderClient mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(getActivity());
104            SupportMapFragment mapFragment =(SupportMapFragment)getActivity().getSupportFragmentManager().findFragmentById(R.id.map);
105            mapFragment.getMapAsync(this);
106            //この行にNul
107        }
108    }
109
110    @Override
111    public  void onMapReady(GoogleMap googleMap) {
112
113        mMap = googleMap;
114        mMap.setMyLocationEnabled(true);
115        Log.d("a","OKabc");
116
117        if (ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[0]) == GRANTED ||
118                ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[1]) == GRANTED) {
119
120
121            Criteria criteria = new Criteria();
122            //以下位置情報の精度を設定、高精度にした
123            criteria.setAccuracy(Criteria.ACCURACY_FINE);
124            //基準を満たすプロバイダ名を取得する
125            String provider = locationmanager1.getBestProvider(criteria, true);
126            // 最後の位置情報取得
127            location1 = locationmanager1.getLastKnownLocation(provider);
128
129            double lat =  location1.getLatitude();
130            double lon =  location1.getLongitude();
131            latlong = new LatLng(lat, lon);
132            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latlong, 19));
133
134            mButton=(Button)getActivity().findViewById(R.id.button) ;
135            mButton.setOnClickListener(this);
136
137            //プロバイダーに基づいた リスナー を登録する
138            //最低0秒、最低0mで発火、これより細かい更新はされない
139
140            //locationmanager1.removeUpdates(this);
141
142        }
143
144    }
145
146    public void onClick(View view){
147        switch (view.getId()) {
148            case R.id.button:
149                if (ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[0]) == GRANTED ||
150                        ActivityCompat.checkSelfPermission(getActivity(), LOCATION_PERMISSION[1]) == GRANTED) {
151
152                    locationmanager1.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
153                    locationmanager1.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
154                }
155                break;
156        }
157    }
158
159    // アクセス許可のダイアログで操作を行ったときに呼ばれるメソッド
160    @Override
161    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
162        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
163        if (requestCode == LOCATION_CODE) {
164            if (grantResults[0] == GRANTED) {
165                startLocation();
166            } else {
167                // 拒否されたのならアプリ続行不可能
168                getActivity().finish();
169            }
170        }
171
172    }
173
174
175    @Override
176    public void onDestroy() {
177        super.onDestroy();
178        locationmanager1.removeUpdates(this);
179    }
180
181
182    @Override
183    public void onStatusChanged(String provider, int status, Bundle extras) {
184        switch (status) {
185            case LocationProvider.AVAILABLE:
186                Log.d("debug", "LocationProvider.AVAILABLE");
187                break;
188            case LocationProvider.OUT_OF_SERVICE:
189                Log.d("debug", "LocationProvider.OUT_OF_SERVICE");
190                break;
191            case LocationProvider.TEMPORARILY_UNAVAILABLE:
192                Log.d("debug", "LocationProvider.TEMPORARILY_UNAVAILABLE");
193                break;
194        }
195    }
196
197    @Override
198    public void onLocationChanged(Location location) {
199        //LatLng curr = new LatLng(location.getLatitude(), location.getLongitude());
200        //mMap.animateCamera(CameraUpdateFactory.newLatLng(curr));
201
202        double lat = location.getLatitude();
203        double lon = location.getLongitude();
204        latlong2 = new LatLng(lat, lon);
205
206        TextView text=(TextView)getActivity().findViewById(R.id.textView1);
207        text.setText(latlong2.toString());
208
209        drawTrace(latlong2);
210    }
211
212    @Override
213    public void onProviderEnabled(String s) {
214        Log.d("Tag","enable");
215    }
216
217    //ロケーションプロバイダが利用不可能になるとコールバックされる
218    @Override
219    public void onProviderDisabled(String s) {
220        Log.d("Tag","provider,disable");
221    }
222
223    @Override
224    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
225
226    }
227
228    //mRunListの緯度経度のリストをポリラインオプションの要素に加える
229    private void drawTrace(LatLng latlng) {
230        mRunList.add(latlng);
231        PolylineOptions polyOptions = new PolylineOptions();
232        for (LatLng polyLatLng : mRunList) {
233            polyOptions.add(polyLatLng);
234        }
235
236        polyOptions.color(Color.BLUE);
237        polyOptions.width(4);
238        polyOptions.geodesic(false);
239        mMap.addPolyline(polyOptions);
240
241    }
242
243}
244
245

試したこと

try {
startLocation();
} catch(NullPointerException e) {
e.printStackTrace();
Log.d("tag","Null-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
}

を実行することでNullpointerExceptionが確認できました

startLocation()内に Log.d("tag","Null-bbbbbbbbbbbbbbbbbbbbbbbbbb");を入れてビルドしたところ確認できたためstartLocationは実行されています。Nullなら実行されないのでは？と思ってしまうのですが。

補足情報（FW/ツールのバージョンなど）

minSDK versionが28です。
実機でデバックしていて、android10です

行動規範の内容に同意します

回答1件

自己解決

activity
1  <FrameLayout
2        android:id="@+id/fragment"
3        android:layout_width="match_parent"
4        android:layout_height="match_parent"
5        app:layout_constraintBottom_toBottomOf="parent"
6        app:layout_constraintEnd_toEndOf="parent"
7        app:layout_constraintStart_toStartOf="parent"
8        app:layout_constraintTop_toTopOf="parent"/>
9