如何接收 GPS 位置并膨胀 Fragment MapView 以使用 SyncAdapter 以编程方式添加标记

Posted 2023-04-14

【中文标题】如何接收 GPS 位置并膨胀 Fragment MapView 以使用 SyncAdapter 以编程方式添加标记

【英文标题】：How to receive GPS Location and inflate Fragment MapView to programmatically add markers with SyncAdapter

【发布时间】：2016-12-24 19:28:37

【问题描述】：

好吧，在阅读了该站点中的许多示例和许多帖子之后，我已经解决了一些问题，最后我设法让片段响应并且我的 syncAdapter 工作。但是经过这些天尝试了很多事情我还看不到地图。我只有一个空白屏幕。我已经尝试了一些东西，但它对我不起作用。 我遇到了这个问题，我需要继续我的项目。有人可以指导我如何完成这项工作。我真的很感激。 我只想请您注意我所拥有的所有元素，因为我一直在兜圈子，当我试图更改其他运行良好的东西时会中断。这个应用程序有 如下所示：Location 请求（主要活动）在更改时同步并返回 GPS 纬度和经度。之后，它会带来 Fragment，然后我首先使用 GPS lat 和 lon 将数据 Sync 发送到与 Schematic 一起存储在数据库中> 图书馆。 syncAdapter 使用 GPS 纬度和经度传递给 Yelp（据我了解）异步调用。仅供参考，我使用过类似 one 的帖子，但它不适用于我。

当我导入 android.support.v4.app.xxxx 或简单的 import android.app.xxx 时我很小心，因为它会弄乱其他东西。这条路现在正在运行，没有任何中断，但我还看不到地图。

我的尝试： （结果如，重复的 id，Nullpointer） 很少有帖子说使用 getChildFragmentManager，使用 onDestroyView，使用类 SupportMapFragment，但没有任何效果。 这些帖子在这里：one、two、three、four

在阅读了这些帖子后，我调整了以下代码，出现错误“SupportMapFragment 中的 NullPointerException”。我也尝试了普通的 MapFragment，但没有。

我将无法为此感谢你。 干杯像这样调整：（必须将此部分的 minSdkVersion 更改为 17）

在片段中

 @Override
    public void onDestroyView()
    
        super.onDestroyView();
        Fragment fragment = (getActivity().getSupportFragmentManager().findFragmentById(R.id.thismap));
        FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
        ft.remove(fragment);
        ft.commit();
    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 

        //getLoaderManager().initLoader(CURSOR_LOADER_ID, null, this);


                SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager()
                .findFragmentById(R.id.thismap);
        mapFragment.getMapAsync(this);
return null;

对 yelp_google_map.xml 进行了尝试（仅片段，仅此而已）

<fragment android:id="@+id/thismap"
          android:name="com.google.android.gms.maps.SupportMapFragment"
          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:layout_
          android:layout_
          tools:context="mem.edu.joshua.MapsActivity"/>

没有上述调整的整个应用程序 摇篮

apply plugin: 'com.android.application'
apply plugin: 'android-apt'
//apply plugin: 'com.google.gms.google-services'

android 
    compileSdkVersion 24
    buildToolsVersion "24.0.0"

    defaultConfig 
        applicationId "mem.edu.joshua"
        minSdkVersion 16
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
    

    dexOptions 
        preDexLibraries = false
        javaMaxHeapSize "4g"
    

    buildTypes 
        release 
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        
    

    buildTypes.each 
        it.buildConfigField 'String', 'YELP_CONSUMER_KEY', YelpConsumerKey
        it.buildConfigField 'String', 'YELP_CONSUMER_SECRET', YelpConsumerSecret
        it.buildConfigField 'String', 'YELP_TOKEN', YelpToken
        it.buildConfigField 'String', 'YELP_TOKEN_SECRET', YelpTokenSecret
    



repositories 
    mavenCentral()


dependencies 
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    apt 'net.simonvt.schematic:schematic-compiler:0.6.3'

    compile 'net.simonvt.schematic:schematic:0.6.3'
    compile 'com.android.support:appcompat-v7:24.1.1'
    compile 'com.google.firebase:firebase-ads:9.0.2'
    //compile 'com.google.android.gms:play-services-maps:9.2.1'
    compile 'com.google.android.gms:play-services-maps:9.0.2'
    compile 'com.google.android.gms:play-services-location:9.0.2'
    compile 'com.yelp.clientlib:yelp-android:2.0.0'
    compile 'org.scribe:scribe:1.3.7'
    //compile 'com.google.android.gms:play-services:9.2.1'

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest package="mem.edu.joshua"
          xmlns:android="http://schemas.android.com/apk/res/android">

    <!--
         The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
         Google Maps Android API v2, but you must specify either coarse or fine
         location permissions for the 'MyLocation' functionality. 
    -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS"/>
    <uses-permission android:name="android.permission.READ_SYNC_SETTINGS"/>
    <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat">
        <uses-library android:name="com.google.android.maps"/>

        <!--
             The API key for Google Maps-based APIs is defined as a string resource.
             (See the file "res/values/google_maps_api.xml").
             Note that the API key is linked to the encryption key used to sign the APK.
             You need a different API key for each encryption key, including the release key that is used to
             sign the APK for publishing.
             You can define the keys for the debug and release targets in src/debug/ and src/release/. 
        -->
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key"/>

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <!--<activity-->
            <!--android:name=".MapsActivity"-->
            <!--android:label="@string/app_name">-->
            <!--<meta-data-->
                <!--android:name="android.support.PARENT_ACTIVITY"-->
                <!--android:value="mem.edu.joshua.MainActivity"/>-->

            <!--<intent-filter>-->
                <!--<action android:name="android.intent.action.MAIN"/>-->

                <!--<category android:name="android.intent.category.LAUNCHER"/>-->
            <!--</intent-filter>-->
        <!--</activity>-->

        <!-- android:accountType="com.***toolkit.***toolkit" -->
        <service android:name=".sync.AuthenticatorService">
            <intent-filter>
                <action android:name="android.accounts.AccountAuthenticator"/>
            </intent-filter>

            <meta-data
                android:name="android.accounts.AccountAuthenticator"
                android:resource="@xml/authenticator"/>
        </service>

        <!-- The SyncAdapter service -->
        <!-- android:allowParallelSyncs="true" -->
        <service
            android:name=".sync.SyncService"
            android:exported="true">
            <intent-filter>
                <action android:name="android.content.SyncAdapter"/>
            </intent-filter>

            <meta-data
                android:name="android.content.SyncAdapter"
                android:resource="@xml/syncadapter"/>
        </service>

        <provider
            android:name=".data.generated.QuoteProvider"
            android:authorities="mem.edu.joshua.data.QuoteProvider"
            android:exported="false"/>

    </application>

</manifest>

在 mainActivity.java 中

@Override
    public void onConnected(@Nullable Bundle bundle) 

LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

        mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(60000);


        try 

            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,mLocationRequest, (LocationListener) this);

            if (mLocationRequest != null) 
                Log.e(LOG_TAG, "google working");



//                FragmentManager manager = getSupportFragmentManager();
//                FragmentTransaction transaction = manager.beginTransaction();
//                SupportMapFragment fragment = new SupportMapFragment();
//                transaction.add(R.id.mapView, fragment);
//                transaction.commit();

                LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
                Criteria criteria = new Criteria();
                String provider = service.getBestProvider(criteria, false);
                Location location = service.getLastKnownLocation(provider);


                coord.setLon(location.getLongitude());
                coord.setLat(location.getLatitude());

                sPref.saveCoordBody("lat", coord.getLat());
                sPref.saveCoordBody("lon", coord.getLon());

                    getSupportFragmentManager()
                            .beginTransaction()
                            .add(R.id.container, new MapsActivity(), MapsActivity.LOG_TAG)
                            .disallowAddToBackStack()
                            .commit();


            

        catch  (SecurityException e) 
            Log.e(LOG_TAG, e.getMessage(), e);
            e.printStackTrace();
        


    

在 MapsActivity.java (Fragment -> import android.support.v4.app.FragmentActivity;)

public class MapsActivity extends Fragment implements OnMapReadyCallback, LoaderManager.LoaderCallbacks<Cursor> 

GoogleApiClient.ConnectionCallbacks,
        public static final String LOG_TAG = MapsActivity.class.getSimpleName();

    private static final int CURSOR_LOADER_ID = 0;

    private Context mContext;


    private MapCursor mMapCursor;
    protected Location mLastLocation;
    private Cursor initQueryCursor;
    private GetSet coord;
    private AppPreferences sPref;
    private LatLng home;
    private GoogleMap mMap;
    MapView mMapView;

    private GoogleMap googleMap;

        private static final String FRAGMENT_LISTS =
                "net.simonvt.schematic.samples.ui.SampleActivity.LISTS";




    public MapsActivity() 
    


    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);


        sPref = new AppPreferences(getActivity());

        SyncAdapter.syncImmediately(getActivity(),
                sPref.getCoordBody("lat"),
                sPref.getCoordBody("lon"));

    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 

        //getLoaderManager().initLoader(CURSOR_LOADER_ID, null, this);


        View v = inflater.inflate(R.layout.yelp_google_map, container,
                false);


        mMapView = (MapView) v.findViewById(R.id.mapView);

        mMapView.onCreate(savedInstanceState);

        mMapView.onResume();

        mMapView.getMapAsync(this);

        return v;

    


    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) 
        return new CursorLoader(getActivity(), QuoteProvider.Quotes.CONTENT_URI,
                new String[] QuoteColumns._ID, QuoteColumns.DISPLAY_ADDRESS, QuoteColumns.DISPLAY_PHONE,
                        QuoteColumns.RATING, QuoteColumns.URL, QuoteColumns.POSTAL_CODE, QuoteColumns.ID_BUSINESS_NAME,
                        QuoteColumns.LATITUDE,
                        QuoteColumns.LOGITUDE,
                null,
                null,
                null);
    

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) 

        if (loader != null) 
            //     mMapCursor.swapCursor(data);
            initQueryCursor = data;
        
    

    @Override
    public void onLoaderReset(Loader<Cursor> loader) 

    


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


    @Override
    public void onMapReady(GoogleMap googleMap) 
        LatLngBounds.Builder builder = new LatLngBounds.Builder();

        mMap = googleMap;

        initQueryCursor = getContext().getContentResolver().query(QuoteProvider.Quotes.CONTENT_URI,
                new String[]QuoteColumns.LATITUDE, QuoteColumns.LOGITUDE, QuoteColumns.ID_BUSINESS_NAME, null,
                null, null);


        if (initQueryCursor != null) 

            DatabaseUtils.dumpCursor(initQueryCursor);
            initQueryCursor.moveToFirst();
            for (int i = 0; i < initQueryCursor.getCount(); i++) 

                home = new LatLng(Double.valueOf(initQueryCursor.getString(initQueryCursor.getColumnIndex("latitude"))),
                        Double.valueOf(initQueryCursor.getString(initQueryCursor.getColumnIndex("longitude"))));
                mMap.addMarker(new MarkerOptions().position(home).
                        title(initQueryCursor.getString(initQueryCursor.getColumnIndex("id_bussines_name"))));

                initQueryCursor.moveToNext();

                builder.include(home);
            
            if(home!=null) 
                mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 91, 91, 42));
            
        
    

我的 yelp_google_map.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              android:layout_
              android:layout_>

    <!--<include-->
        <!--android:id="@+id/map_toolbar"-->
        <!--layout="@layout/app_bar" />-->



    <LinearLayout

        android:id="@+id/container"
        android:layout_
        android:layout_
        android:orientation="vertical">


        <com.google.android.gms.maps.MapView
            android:id="@+id/mapView"
            android:layout_
            android:layout_
            class="com.google.android.gms.maps.MapFragment" />
        <!--was SupportMapFragment-->
    </LinearLayout>
</LinearLayout>

【参考方案1】：

经过绝望的尝试，我找到了 Mrigank here 在类似帖子中给出的解决方案 我相信在我对代码进行调整之后，即使它正在膨胀，父容器也会以某种方式为空。

所以我的 yelp_google_map.xml 是这样的。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_
                android:layout_
                tools:context="mem.edu.joshua.MapsActivity"
                android:background="#009688">


    <fragment
        android:id="@+id/map"
        android:layout_
        android:layout_
        class="com.google.android.gms.maps.SupportMapFragment" />

</RelativeLayout>

我摆脱了@Override public void onDestroyView 部分

onCreateView 是这样的

***变量： 私有 SupportMapFragment sMap; 私人 FragmentManager 调频； 私有 GoogleMap mMap；

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 

        getLoaderManager().initLoader(CURSOR_LOADER_ID, null, this);
        View v = inflater.inflate(R.layout.yelp_google_map, container, false);

        fm=getChildFragmentManager();

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

        mMap = sMap.getMap();


        initQueryCursor = getActivity().getContentResolver().query(QuoteProvider.Quotes.CONTENT_URI,
                new String[]QuoteColumns.LATITUDE, QuoteColumns.LOGITUDE, QuoteColumns.ID_BUSINESS_NAME, null,
                null, null);

        LatLngBounds.Builder builder = new LatLngBounds.Builder();
        if (initQueryCursor != null) 

            DatabaseUtils.dumpCursor(initQueryCursor);
            initQueryCursor.moveToFirst();
            for (int i = 0; i < initQueryCursor.getCount(); i++) 

                home = new LatLng(Double.valueOf(initQueryCursor.getString(initQueryCursor.getColumnIndex("latitude"))),
                        Double.valueOf(initQueryCursor.getString(initQueryCursor.getColumnIndex("longitude"))));
                mMap.addMarker(new MarkerOptions().position(home).
                        title(initQueryCursor.getString(initQueryCursor.getColumnIndex("id_bussines_name"))));

                initQueryCursor.moveToNext();

                builder.include(home);
            
            if(home!=null) 
                mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 91, 91, 42));
            
        

        return v;

    

在同一个 Fragment java 文件中添加所有这些

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

        @Override
        public void onPause() 
            super.onPause();
            sMap.onPause();
        

        @Override
        public void onDestroy() 
            super.onDestroy();
            sMap.onDestroy();
        

        @Override
        public void onLowMemory() 
            super.onLowMemory();
            sMap.onLowMemory();
        

最后在mainActivity.java中

            getSupportFragmentManager()
                    .beginTransaction()
                    .add(R.id.map, new MapsActivity(), MapsActivity.LOG_TAG)
                    .disallowAddToBackStack()
                    .commitAllowingStateLoss();

希望这对某人有所帮助。这对我来说是一场噩梦。我的应用程序现在运行良好。