有10个地理位置（经度和纬度），应根据我当前位置与第一个最近的地理位置之间的距离指示标记，从该地理位置到下一个附近位置，反之亦然。对于此特定情况任何谷歌地图API支持或我们需要编写自己的算法。如果有的话请告诉我。
先谢谢
答案 0 :(得分：0)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:background="@android:color/white">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:tint="@android:color/white"
android:backgroundTint="#1baec3"
app:fabSize="auto"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="33.8dp"
android:layout_marginRight="13.5dp"
app:srcCompat="@drawable/search" />
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="@dimen/padding_margin_20"/>
<RelativeLayout
android:id="@+id/rl_top"
android:layout_width="match_parent"
android:layout_height="69dp"
android:layout_alignParentTop="true"
android:background="@drawable/gradient_gray" >
<ImageView
android:id="@+id/img_toggle"
android:layout_width="8.5dp"
android:layout_height="8.5dp"
android:layout_centerVertical="true"
android:src="@drawable/icon_toggle"
android:tint="@color/text_color"
android:scaleType="fitXY" />
<TextView
android:id="@+id/tv_search_directory_near"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/img_toggle"
android:layout_centerVertical="true"
android:layout_marginLeft="@dimen/padding_margin_5"
android:text="@string/near"
android:textSize="9sp"
android:textColor="#797979"/>
<LinearLayout
android:id="@+id/ly_map_radius"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="11.5dp"
android:layout_centerVertical="true"
android:layout_toRightOf="@id/tv_search_directory_near"
android:background="@drawable/bg_radius_black_line"
android:orientation="horizontal">
<ImageView
android:layout_width="10.3dp"
android:layout_height="6dp"
android:layout_gravity="center_vertical"
android:layout_marginLeft="9.5dp"
android:layout_marginTop="9.3dp"
android:layout_marginBottom="9.8dp"
android:src="@drawable/down_arrow"
android:tint="#797979"/>
<TextView
android:id="@+id/tv_map_radius"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="6.3dp"
android:layout_marginTop="9.3dp"
android:layout_marginBottom="8.8dp"
android:layout_marginRight="11dp"
android:text="@string/spinner_radius"
android:textSize="9sp"
android:fontFamily="@font/roboto"
android:textColor="#797979"/>
</LinearLayout>
<LinearLayout
android:id="@+id/ly_map_country"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10.8dp"
android:layout_centerVertical="true"
android:layout_toRightOf="@id/ly_map_radius"
android:background="@drawable/bg_radius_black_line"
android:orientation="horizontal">
<ImageView
android:layout_width="10.3dp"
android:layout_height="6dp"
android:layout_gravity="center_vertical"
android:layout_marginLeft="9.5dp"
android:layout_marginTop="9.3dp"
android:layout_marginBottom="9.8dp"
android:src="@drawable/down_arrow"
android:tint="#797979"/>
<TextView
android:id="@+id/tv_map_country"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="6.3dp"
android:layout_marginTop="9.5dp"
android:layout_marginBottom="@dimen/padding_margin_7"
android:layout_marginRight="@dimen/padding_margin_15"
android:text="@string/spinner_country"
android:textSize="9sp"
android:textColor="#1baec3"/>
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
public class Map_Fragment extends Fragment implements GoogleMap.OnMarkerClickListener, OnMapReadyCallback, View.OnClickListener{
private GoogleMap mMap;
LatLng markerLocation;
Projection projection;
Point screenPosition;
private static final LatLng PERTH = new LatLng(-31.952854, 115.857342);
private static final LatLng SYDNEY = new LatLng(-33.87365, 151.20689);
private static final LatLng BRISBANE = new LatLng(-27.47093, 153.0235);
private Marker mPerth;
private Marker mSydney;
private Marker mBrisbane;
LinearLayout ly_map_radius, ly_map_country;
TextView tv_map_radius, tv_map_country;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_map, container, false);
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
ly_map_radius = root.findViewById(R.id.ly_map_radius);
ly_map_country = root.findViewById(R.id.ly_map_country);
tv_map_radius = root.findViewById(R.id.tv_map_radius);
tv_map_country = root.findViewById(R.id.tv_map_country);
return root;
}
@Override
public void onViewCreated(final View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
ly_map_radius.setOnClickListener(this);
ly_map_country.setOnClickListener(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
projection = mMap.getProjection();
LatLng sydney = new LatLng(-34, 151);
mPerth = mMap.addMarker(new MarkerOptions()
.position(PERTH)
.title("Perth")
.snippet("Population: Perth")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
mSydney = mMap.addMarker(new MarkerOptions()
.position(SYDNEY)
.title("Sydney")
.snippet("Population: Sydney")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
mSydney.showInfoWindow();
mBrisbane = mMap.addMarker(new MarkerOptions()
.position(BRISBANE)
.title("Brisbane")
.snippet("Population: Brisbane")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
mBrisbane.showInfoWindow();
mMap.setOnMarkerClickListener(this);
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
@Override
public boolean onMarkerClick(Marker marker) {
return false;
}
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
switch (v.getId()){
case R.id.ly_map_country:
builder.setTitle("Select Country");
builder.setItems(countries, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
tv_map_country.setText(countries[which]);
}
});
break;
case R.id.ly_map_radius:
builder.setTitle("Select Radius");
builder.setItems(radius, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
tv_map_radius.setText(radius[which] + " km radius");
}
});
break;
}
AlertDialog dialog = builder.create();
dialog.show();
}
}