android如何在标记下移动地图

嗨,在第一个问题会很奇怪,但让我解释..
假设我们在地图上有一个居中的标记,当我们用手指移动地图时,我们可以看到当你离开该区域的边界时,该标记将不再显示。那么,我们如何将一个标记始终保留在地图的中心,尽管我们将地图移动到任何地方?有一个名为UBER的应用程序,它们提供此功能,您不要拖放标记,只需移动地图,标记仍然是它的位置。

这是一枪

因为你可以看到绿色的标记在屏幕的中心,当我们移动地图,它仍然是它的地方,但显示新的位置,当用户停止移动地图..我们该怎么做这样?

拖曳标记时,我有一个代码显示地址,如何再次显示地址,但这次不要拖动,移动地图?希望你能理解任何想法会是伟大的..

    public class MainActivity extends AbstractMapActivity implements
    OnNavigationListener, OnInfoWindowClickListener,
    OnMarkerDragListener {
private static final String STATE_NAV="nav";
private static final int[] MAP_TYPE_NAMES= { R.string.normal,
    R.string.hybrid, R.string.satellite, R.string.terrain };
private static final int[] MAP_TYPES= { GoogleMap.MAP_TYPE_NORMAL,
    GoogleMap.MAP_TYPE_HYBRID, GoogleMap.MAP_TYPE_SATELLITE,
    GoogleMap.MAP_TYPE_TERRAIN };
private GoogleMap map=null;
String filterAddress = "";
Marker marker;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);





    if (readyToGo()) {
        setContentView(R.layout.activity_main);

        SupportMapFragment mapFrag=
            (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);

        mapFrag.setRetainInstance(true);
        initListNav();

        map=mapFrag.getMap();

        if (savedInstanceState == null) {
            CameraUpdate center=
                CameraUpdateFactory.newLatLng(new LatLng(
                        41.003739,
                        28.999572));
            CameraUpdate zoom=CameraUpdateFactory.zoomTo(10);

            map.moveCamera(center);
            map.animateCamera(zoom);

            addMarker(map, 41.003739, 28.999572, R.string.un, R.string.united_nations);

              map.setInfoWindowAdapter(new PopupAdapter(getLayoutInflater()));
              map.setOnInfoWindowClickListener(this);
              map.setOnMarkerDragListener(this);




        }



    }
}

@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
    map.setMapType(MAP_TYPES[itemPosition]);

    return(true);
}

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);

    savedInstanceState.putInt(STATE_NAV,
            getSupportActionBar().getSelectedNavigationIndex());
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);

    getSupportActionBar().setSelectedNavigationItem(savedInstanceState.getInt(STATE_NAV));
}

@Override
public void onInfoWindowClick(Marker marker) {
    Toast.makeText(this, marker.getTitle(), Toast.LENGTH_LONG).show();
}




@Override
public void onMarkerDragStart(Marker marker) {
    LatLng position=marker.getPosition();



    Log.d(getClass().getSimpleName(), String.format("Drag from %f:%f",
            position.latitude,
            position.longitude));
}

@Override
public void onMarkerDrag(Marker marker) {
    LatLng position=marker.getPosition();


    Log.d(getClass().getSimpleName(),
            String.format("Dragging to %f:%f", position.latitude,
                    position.longitude));
}

@Override
public void onMarkerDragEnd(Marker marker) {
    LatLng position=marker.getPosition();


    String filterAddress = "";
    Geocoder geoCoder = new Geocoder(
            getBaseContext(), Locale.getDefault());
    try {
        List<Address> addresses = geoCoder.getFromLocation(
                position.latitude, 
                position.longitude, 1);

        if (addresses.size() > 0) {
            for (int index = 0; 
            index < addresses.get(0).getMaxAddressLineIndex(); index++)
                filterAddress += addresses.get(0).getAddressLine(index) + " ";
        }
    }catch (IOException ex) {        
        ex.printStackTrace();
    }catch (Exception e2) {
        // TODO: handle exception

        e2.printStackTrace();
    } 
    Log.d(getClass().getSimpleName(),
            String.format("Dragging to %f:%f", position.latitude,
                    position.longitude));
    TextView myTextView = (TextView) findViewById(R.id.test);

    myTextView.setText("Address is: " + filterAddress);

}





private void initListNav() {
    ArrayList<String> items=new ArrayList<String>();
    ArrayAdapter<String> nav=null;
    ActionBar bar=getSupportActionBar();

    for (int type : MAP_TYPE_NAMES) {
        items.add(getString(type));
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        nav=
            new ArrayAdapter<String>(
                    bar.getThemedContext(),
                    android.R.layout.simple_spinner_item,
                    items);
    }
    else {
        nav=
            new ArrayAdapter<String>(
                    this,
                    android.R.layout.simple_spinner_item,
                    items);
    }

    nav.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
    bar.setListNavigationCallbacks(nav, this);
}

private void addMarker(GoogleMap map, double lat, double lon,
        int title, int snippet)

{
    map.addMarker(new MarkerOptions().position(new LatLng(lat, lon))
            .icon(BitmapDescriptorFactory.fromResource(R.drawable.pin))

            .draggable(true));
}

    }

这是xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/img_header" >

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

<TextView
    android:id="@+id/test"
    android:layout_width="match_parent"
    android:layout_height="90dp"
    android:layout_alignParentRight="true"
    android:text="Address : "
    android:textColor="#FF0000"
    android:textSize="22sp" />



</RelativeLayout>
两个简单的步骤:

步骤1

我使用RelativeLayout作为片段的父母,其中具有地图和中心的ImageView(它将像在uber或easy taxi应用程序中的中心地图标记一样):

<!-- Map and ImageView in center for simulating the map marker -->
<RelativeLayout
    android:id="@+id/confirm_address_map_wrapper"
    android:layout_width="match_parent"
    android:layout_height="220dp">

    <fragment
        android:id="@+id/confirm_address_map_fragment"
        android:name="com.google.android.gms.maps.MapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"
        />
    <!-- Image View that acts as map marker notice centerInParent-->
    <ImageView
        android:id="@+id/confirm_address_map_custom_marker"
        android:layout_width="@dimen/ICON_DEFAULT_SIZE"
        android:layout_height="@dimen/ICON_DEFAULT_SIZE"
        android:layout_centerInParent="true"
        android:src="@mipmap/my_map_marker"/>
</RelativeLayout>

第2步

onMapReady()方法在我的活动我使用googleMap实例方法setOnCameraChangeListener(),让我在使用地图时收听,并根据摄像头位置的中心获取纬度和经度:

    @Override
    public void onMapReady(GoogleMap googleMap) {

        googleMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
        @Override
        public void onCameraChange(CameraPosition cameraPosition) {

           Log.i("centerLat",cameraPosition.target.latitude);

           Log.i("centerLong",cameraPosition.target.longitude);
        }
    });

}
http://stackoverflow.com/questions/19346206/android-how-to-move-a-map-under-a-marker

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