How do I get the coordinates of a map on tap with

问题:

I have searched around on how to get the coordinates of a location when the map is tapped. However, most, if not all the examples require a MapView as a parameter. For example:

public boolean onTap(GeoPoint p, MapView map){
    if ( isPinch ){
        return false;
    }else{
        Log.i(TAG,"TAP!");
        if ( p!=null ){
            handleGeoPoint(p);
            return true;            // We handled the tap
        }else{
            return false;           // Null GeoPoint
        }
    }
}

@Override
public boolean onTouchEvent(MotionEvent e, MapView mapView)
{
    int fingers = e.getPointerCount();
    if( e.getAction()==MotionEvent.ACTION_DOWN ){
        isPinch=false;  // Touch DOWN, don't know if it's a pinch yet
    }
    if( e.getAction()==MotionEvent.ACTION_MOVE && fingers==2 ){
        isPinch=true;   // Two fingers, def a pinch
    }
    return super.onTouchEvent(e,mapView);
}

How do I therefore get the location of a tapped position on the map with MapFragment and not MapView?

回答1:

There is an example in the Sample Code provided by Google Play services SDK. This uses SupportMapFragment so I'm not sure how helpful this will be if you are using the new MapFragment.

The method the EventsDemoActivity uses in this map sample code is to implement OnMapClickListener to the class. Below is some of the code you might be able to use.

EventsDemoActivity:

public class EventsDemoActivity extends FragmentActivity
    implements OnMapClickListener, OnMapLongClickListener {

    private GoogleMap mMap;
    private TextView mTapTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.events_demo);

        mTapTextView = (TextView) findViewById(R.id.tap_text);

        setUpMapIfNeeded();
    }

    private void setUpMap() //If the setUpMapIfNeeded(); is needed then...
    {
        mMap.setOnMapClickListener(this);
        mMap.setOnMapLongClickListener(this);
    }

    @Override
    public void onMapClick(LatLng point) {
        mTapTextView.setText("tapped, point=" + point);
    }

    @Override
    public void onMapLongClick(LatLng point) {
        mTapTextView.setText("long pressed, point=" + point);
    }
}

events_demo.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
  <TextView
    android:id="@+id/tap_text"
    android:text="@string/tap_instructions"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
  <fragment
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    class="com.google.android.gms.maps.SupportMapFragment"/>
</LinearLayout>