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Thursday, 3 January 2013

Google Maps Android API v2 example: detect MarkerClick and add Polyline

11:46
Further work on last exercise to "detect long click on map and add marker", add function to detect MarkerClick event on GoogleMap, and add Polyline.

detect MarkerClick and add Polyline


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.OnMarkerClickListener;
import com.google.android.gms.maps.MapFragment;
//import com.google.android.gms.maps.SupportMapFragment;
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.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.FragmentManager;
import android.graphics.Color;
import android.location.Location;
import android.os.Bundle;
//import android.support.v4.app.FragmentActivity;
//import android.support.v4.app.FragmentManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

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

final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;

Location myLocation;
TextView tvLocInfo;

boolean markerClicked;
PolylineOptions rectOptions;
Polyline polyline;

@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.setOnMarkerClickListener(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() {
// TODO Auto-generated method stub
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).title(point.toString()));

markerClicked = false;
}

@Override
public boolean onMarkerClick(Marker marker) {

if(markerClicked){

if(polyline != null){
polyline.remove();
polyline = null;
}

rectOptions.add(marker.getPosition());
rectOptions.color(Color.RED);
polyline = myMap.addPolyline(rectOptions);
}else{
if(polyline != null){
polyline.remove();
polyline = null;
}

rectOptions = new PolylineOptions().add(marker.getPosition());
markerClicked = true;
}

return true;
}

}



download filesDownload the files.

Next:
- Draw Polygon on GoogleMap


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

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