在地图Android中的对话框

Question

我想在地图开始时创建一个对话框。.我在地图活动上创建此代码，但我不知道如何使它工作我缺少什么！/p>

这是我显示地图

的活动的完整代码

public class MapsActivity extends FragmentActivity implements 
OnMapReadyCallback {
private GoogleMap mMap;
LatLng origin, dest;
String name, name1;
ArrayList<LatLng> MarkerPoints;
TextView ShowDistanceDuration;
Polyline line;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
#.......
@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    // Creating CameraUpdate object for position
    CameraUpdate updatePosition = CameraUpdateFactory.newLatLng(origin);
    // Creating CameraUpdate object for zoom
    CameraUpdate updateZoom = CameraUpdateFactory.zoomBy(4);
    // Updating the camera position to the user input latitude and longitude
    googleMap.moveCamera(updatePosition);
    // Applying zoom to the marker position
    googleMap.animateCamera(updateZoom);
    Button btnDriving = (Button) findViewById(R.id.btnDriving);
    btnDriving.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            build_retrofit_and_get_response("driving");
        }
    });
    Button btnWalk = (Button) findViewById(R.id.btnWalk);
    btnWalk.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            build_retrofit_and_get_response("walking");
        }
    });
}
private void addMarker(GoogleMap googleMap, LatLng position, String name) {
    // Instantiating MarkerOptions class
    MarkerOptions options = new MarkerOptions();
    // Setting position for the MarkerOptions
    options.position(position);
    // Setting title for the MarkerOptions
    options.title(name);
    // Setting snippet for the MarkerOptions
    options.snippet("Latitude:"+position.latitude+",Longitude:"+position.longitude)
    googleMap.addMarker(options);
}
    // *****************for the dialog  to change map*********//
private static final CharSequence[] MAP_TYPE_ITEMS =
        {"Road Map", "Hybrid", "Satellite", "Terrain"};
private void showMapTypeSelectorDialog() {
    // Prepare the dialog by setting up a Builder.
    final String fDialogTitle = "Select Map Type";
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(fDialogTitle);
    // Find the current map type to pre-check the item representing the 
 current state.
    int checkItem = mMap.getMapType() - 1;
    // Add an OnClickListener to the dialog, so that the selection will be 
handled.
    builder.setSingleChoiceItems(
            MAP_TYPE_ITEMS,
            checkItem,
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int item) {
                    // Locally create a finalised object.
                    // Perform an action depending on which item was 
 selected.
                    switch (item) {
                        case 1:
                            mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
                            break;
                        case 2:
                            mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
                            break;
                        case 3:
                            mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
                            break;
                        default:
                            mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
                    }
                    dialog.dismiss();
                }
            }
    );
    // Build the dialog and show it.
    AlertDialog fMapTypeDialog = builder.create();
    fMapTypeDialog.setCanceledOnTouchOutside(true);
    fMapTypeDialog.show();
  }
 }

Answer 1

只需在您的activity_maps.xml文件中添加另一个Button，然后使用此Button通过呼叫方法showMapTypeSelectorDialog()更改地图类型。

更新onMapReady()如下：

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    // Creating CameraUpdate object for position
    CameraUpdate updatePosition = CameraUpdateFactory.newLatLng(origin);
    // Creating CameraUpdate object for zoom
    CameraUpdate updateZoom = CameraUpdateFactory.zoomBy(4);
    // Updating the camera position to the user input latitude and longitude
    googleMap.moveCamera(updatePosition);
    // Applying zoom to the marker position
    googleMap.animateCamera(updateZoom);
    Button btnDriving = (Button) findViewById(R.id.btnDriving);
    btnDriving.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            build_retrofit_and_get_response("driving");
        }
    });
    Button btnWalk = (Button) findViewById(R.id.btnWalk);
    btnWalk.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            build_retrofit_and_get_response("walking");
        }
    });
    Button btnChangeMap = (Button) findViewById(R.id.btnChangeMap);
    btnChangeMap.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // Show map selection dialog
            showMapTypeSelectorDialog();
        }
    });
}

添加Button以下添加到activity_maps.xml

<Button
    android:id="@+id/btnChangeMap"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Change Map"/>

希望这会有所帮助〜