将当前位置添加到 fragment.class

Posted 2023-04-14

【中文标题】将当前位置添加到 fragment.class

【英文标题】：Add current location to a fragment.class

【发布时间】：2018-11-06 19:02:35

【问题描述】：

我有点困惑...在互联网上找不到任何东西。

我想在标签片段中显示谷歌地图。它运作良好。但是如何设置片段的当前经度和纬度？

这里是xml：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
tools:context=".TabMap"
android:background="#DBDBDB">

<com.google.android.gms.maps.MapView
    android:id="@+id/map"
    android:layout_
    android:layout_
    android:layout_marginBottom="60dp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp">

</com.google.android.gms.maps.MapView>

地图片段

public class TabMap extends Fragment implements OnMapReadyCallback

GoogleMap mGoogleMap ;
MapView mMapView;
View mView;

Location location = new Location();

public TabMap() 
    // Required empty public constructor



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) 
    // Inflate the layout for this fragment
    mView =  inflater.inflate(R.layout.fragment_tab_map, container, false);
    return mView;



@Override
public void onViewCreated(View view, Bundle savedInstanceState) 
    super.onViewCreated(view, savedInstanceState);

    mMapView = (MapView) mView.findViewById(R.id.map);
    if(mMapView != null) 
        mMapView.onCreate(null);
        mMapView.onResume();
        mMapView.getMapAsync(this);
    


@Override
public void onMapReady(GoogleMap googleMap) 

    MapsInitializer.initialize(getContext());

    mGoogleMap = googleMap;
    googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

    googleMap.addMarker(new MarkerOptions().position(new LatLng(51.1657, 10.4515)).title("Germany"));

    CameraPosition de = CameraPosition.builder().target(new LatLng(51.1657, 10.4515)).zoom(6).bearing(0).build();

    googleMap.moveCamera(CameraUpdateFactory.newCameraPosition(de));

location.class

public class Location extends AppCompatActivity 

private static final int REQUEST_CODE = 1000;
TextView txtLocation;
Button btnLocation, btnStop;

AutoCompleteTextView gMap;

FusedLocationProviderClient fusedLocationProviderClient;
LocationRequest locationRequest;
LocationCallback locationCallback;

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) 
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) 
        case REQUEST_CODE: 
            if (grantResults.length > 0) 
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) 

                 else if (grantResults[0] == PackageManager.PERMISSION_DENIED) 

                
            
        
    


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.locations);

    Button button = (Button) findViewById(R.id.button3);
    button.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            Intent intent = new Intent(v.getContext(), MainActivity.class);
            startActivityForResult(intent, 0);
        
    );

    txtLocation = (TextView) findViewById(R.id.txtLocation);
    btnLocation = (Button) findViewById(R.id.btnLocation);
    btnStop = (Button) findViewById(R.id.btnStop);

    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION))
    

        ActivityCompat.requestPermissions(this, new String[]Manifest.permission.ACCESS_FINE_LOCATION, REQUEST_CODE);
     else 
        buildLocationRequest();
        buildLocationCallBack();

        fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);

        btnLocation.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                if (ActivityCompat.checkSelfPermission(Location.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                        && ActivityCompat.checkSelfPermission(Location.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
                    ActivityCompat.requestPermissions(Location.this, new String[]Manifest.permission.ACCESS_FINE_LOCATION, REQUEST_CODE);
                    return;
                
                fusedLocationProviderClient.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper());

                btnLocation.setEnabled(!btnLocation.isEnabled());
                btnStop.setEnabled(!btnStop.isEnabled());
            
        );

        btnStop.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                if (ActivityCompat.checkSelfPermission(Location.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                        && ActivityCompat.checkSelfPermission(Location.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
                    ActivityCompat.requestPermissions(Location.this, new String[]Manifest.permission.ACCESS_FINE_LOCATION, REQUEST_CODE);
                    return;
                
                fusedLocationProviderClient.removeLocationUpdates(locationCallback);

                btnLocation.setEnabled(!btnLocation.isEnabled());
                btnStop.setEnabled(!btnStop.isEnabled());
            
        );

    


public void buildLocationCallBack() 
    locationCallback = new LocationCallback()
        @Override
        public void onLocationResult(LocationResult locationResult) 
            for(android.location.Location location:locationResult.getLocations())
                txtLocation.setText(String.valueOf(location.getLatitude())
                        + "/" +
                        String.valueOf(location.getLongitude()));
        
    ;


private void buildLocationRequest() 
    locationRequest = new LocationRequest();
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(5000);
    locationRequest.setFastestInterval(3000);
    locationRequest.setSmallestDisplacement(10);

所以。我有一个导航栏，可以选择添加位置（location.class） 它打开并点击“当前位置”按钮，它在 TextView 中显示纬度和经度。

但是我如何将这些信息传递给 TabMap.class、googleMap.addMarker 方法呢？

提前致谢！

【问题讨论】：

在 onMapReady map.setMyLocationEnabled(true) 中添加这个；

【参考方案1】：

在onMapReady方法中替换这段代码

@Override
public void onMapReady(GoogleMap googleMap) 

    MapsInitializer.initialize(getContext());

    mGoogleMap = googleMap;
    googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    mGoogleMap.setMyLocationEnabled(true);
    mGoogleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() 
        @Override
        public void onMyLocationChange(Location location) 
            if(location!=null)
                mGoogleMap.addMarker(new MarkerOptions().position(new LatLng(location.getLatitude(), location.getLongitude())).title("Germany"));
                CameraPosition de = CameraPosition.builder().target(new LatLng(location.getLatitude(), location.getLongitude())).zoom(6).bearing(0).build();
                mGoogleMap.moveCamera(CameraUpdateFactory.newCameraPosition(de));
                           
        
    );

【参考方案2】：

你的问题是你不能让你的活动和片段通信。实现此目的的一种简单方法是使用库 EventBus ： https://github.com/greenrobot/EventBus

请阅读文档。

【参考方案3】：

将此代码放入 OnMapReady 方法中：（它在蓝点中显示您的位置。）

    @Override
    public void onMapReady(GoogleMap googleMap) 
        if (mMap != null) 
            return;
        

        mMap = googleMap;
        if (mMap == null) 
            return;
        

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        
        mMap.setMyLocationEnabled(true);

        mMap.setOnMyLocationChangeListener(new mMap.OnMyLocationChangeListener() 
        @Override
        public void onMyLocationChange(Location location) 
            if(location!=null)
                mMap.addMarker(new MarkerOptions().position(new LatLng(location.getLatitude(), location.getLongitude())).title("Germany"));
                CameraPosition de = CameraPosition.builder().target(new LatLng(location.getLatitude(), location.getLongitude())).zoom(6).bearing(0).build();
                mMap.moveCamera(CameraUpdateFactory.newCameraPosition(de));
                           
        
    );
    

【讨论】：

非常感谢！必须在“getActivity().getApplicationContext()”中更改“this”。现在它正在工作。太棒了！

如果您发现我的回答对使用upvote the answer.thanks 支持他人很有帮助