【发布时间】：2018-06-08 15:26:20
【问题描述】：
我有三个可滑动的标签。每个选项卡都是一个片段。第一个片段显示图像。第二个片段应该获取用户位置并将其显示在地图上。我在第二个片段的布局中使用了 SupportMapFragment，请参阅下面的 xml：fragment_map.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<fragment
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/current_location"
android:name="com.google.android.gms.maps.SupportMapFragment"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="?attr/actionBarSize"
/>
</android.support.constraint.ConstraintLayout>
我的片段代码如下：
public class MapFragment extends Fragment implements OnMapReadyCallback {
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1;
private GoogleMap mMap;
private View view;
private SupportMapFragment mapFragment;
public MapFragment ()
{
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_map, container, false);
init();
return view;
}
private void init() {
FragmentManager fm = getActivity().getSupportFragmentManager();
mapFragment = (SupportMapFragment) fm.findFragmentById(R.id.current_location);
if (mapFragment == null) {
mapFragment = SupportMapFragment.newInstance();
}
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setOnMyLocationButtonClickListener(onMyLocationButtonClickListener);
mMap.setOnMyLocationClickListener(onMyLocationClickListener);
enableMyLocationIfPermitted();
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.setMinZoomPreference(11);
}
private void enableMyLocationIfPermitted() {
if (ContextCompat.checkSelfPermission(this.getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this.getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION},
LOCATION_PERMISSION_REQUEST_CODE);
} else if (mMap != null) {
mMap.setMyLocationEnabled(true);
}
}
private void showDefaultLocation() {
Toast.makeText(this.getActivity(), "Location permission not granted, " +
"showing default location",
Toast.LENGTH_SHORT).show();
LatLng redmond = new LatLng(-33.98827, 25.64636);
mMap.moveCamera(CameraUpdateFactory.newLatLng(redmond));
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
switch (requestCode) {
case LOCATION_PERMISSION_REQUEST_CODE: {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
enableMyLocationIfPermitted();
} else {
showDefaultLocation();
}
return;
}
}
}
private GoogleMap.OnMyLocationButtonClickListener onMyLocationButtonClickListener =
new GoogleMap.OnMyLocationButtonClickListener() {
@Override
public boolean onMyLocationButtonClick() {
mMap.setMinZoomPreference(15);
return false;
}
};
private GoogleMap.OnMyLocationClickListener onMyLocationClickListener =
new GoogleMap.OnMyLocationClickListener() {
@Override
public void onMyLocationClick(@NonNull Location location) {
mMap.setMinZoomPreference(12);
CircleOptions circleOptions = new CircleOptions();
circleOptions.center(new LatLng(location.getLatitude(),
location.getLongitude()));
circleOptions.radius(200);
circleOptions.fillColor(Color.RED);
circleOptions.strokeWidth(6);
mMap.addCircle(circleOptions);
}
};
}
保存片段代码的活动如下：
public class TabActivity extends AppCompatActivity {
private TabLayout tabLayout;
//This is our viewPager
private ViewPager viewPager;
String[] tabTitle={"Image","Your Location","Sign Out"};
ImageFragment imageFragment;
MapFragment mapFragment;
LogOutFragment logOutFragment;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab);
//Initializing viewPager
viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setOffscreenPageLimit(3);
setupViewPager(viewPager);
//Initializing the tablayout
tabLayout = (TabLayout) findViewById(R.id.tablayout);
tabLayout.setupWithViewPager(viewPager);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
viewPager.setCurrentItem(position,false);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
private void setupViewPager(ViewPager viewPager) {
if(activeNetwork())
{
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
imageFragment = new ImageFragment();
mapFragment = new MapFragment();
logOutFragment = new LogOutFragment();
adapter.addFragment(imageFragment, "Image");
adapter.addFragment(mapFragment, "Map");
adapter.addFragment(logOutFragment, "Logout");
viewPager.setAdapter(adapter);
}
else
{
}
}
public boolean activeNetwork () {
// TODO: Not the most efficient method but will do for this context
ConnectivityManager cm =
(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
activeNetwork.isConnected();
return isConnected;
}
}
我目前面临的问题是显示地图。但是，Google OnMyLocationButtonClickListener 按钮不显示，下面显示当前视图，不显示我当前位置
【问题讨论】：
标签： android location android-location gmsmapview