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Monday, 7 January 2013

Google Maps Android API v2 example: Draggable Marker

12:21
To make the marker draggable:
- sets the draggability for the marker to true by calling draggable(true) when new the MarkerOptions.
- implements OnMarkerDragListener in your activity.
- call myMap.setOnMarkerDragListener(this).
- override onMarkerDrag(), onMarkerDragEnd() and onMarkerDragStart().

Draggable Marker


package com.example.androidmapsv2;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.GoogleMap.OnMarkerDragListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polygon;
import com.google.android.gms.maps.model.PolygonOptions;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.FragmentManager;
import android.location.Location;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity
implements OnMapClickListener, OnMapLongClickListener, OnMarkerDragListener{

final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;

Location myLocation;
TextView tvLocInfo;

boolean markerClicked;
PolygonOptions polygonOptions;
Polygon polygon;

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

tvLocInfo = (TextView)findViewById(R.id.locinfo);

FragmentManager myFragmentManager = getFragmentManager();
MapFragment myMapFragment
= (MapFragment)myFragmentManager.findFragmentById(R.id.map);
myMap = myMapFragment.getMap();

myMap.setMyLocationEnabled(true);

myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);

myMap.setOnMapClickListener(this);
myMap.setOnMapLongClickListener(this);
myMap.setOnMarkerDragListener(this);

markerClicked = false;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_legalnotices:
String LicenseInfo = GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo(
getApplicationContext());
AlertDialog.Builder LicenseDialog = new AlertDialog.Builder(MainActivity.this);
LicenseDialog.setTitle("Legal Notices");
LicenseDialog.setMessage(LicenseInfo);
LicenseDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}

@Override
protected void onResume() {

super.onResume();

int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());

if (resultCode == ConnectionResult.SUCCESS){
Toast.makeText(getApplicationContext(),
"isGooglePlayServicesAvailable SUCCESS",
Toast.LENGTH_LONG).show();
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
}

}

@Override
public void onMapClick(LatLng point) {
tvLocInfo.setText(point.toString());
myMap.animateCamera(CameraUpdateFactory.newLatLng(point));

markerClicked = false;
}

@Override
public void onMapLongClick(LatLng point) {
tvLocInfo.setText("New marker added@" + point.toString());
myMap.addMarker(new MarkerOptions()
.position(point)
.draggable(true));

markerClicked = false;
}

@Override
public void onMarkerDrag(Marker marker) {
tvLocInfo.setText("Marker " + marker.getId() + " Drag@" + marker.getPosition());
}

@Override
public void onMarkerDragEnd(Marker marker) {
tvLocInfo.setText("Marker " + marker.getId() + " DragEnd");
}

@Override
public void onMarkerDragStart(Marker marker) {
tvLocInfo.setText("Marker " + marker.getId() + " DragStart");

}

}




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The series:
A simple example using Google Maps Android API v2, step by step.

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