Add Marker to Google Map Google Maps Android API v2

To add marker to Google Map of Google Maps Android API v2:

 LatLng targetLatLng = new LatLng(lat, lon);
 MarkerOptions markerOptions =
 new MarkerOptions().position(targetLatLng).title(strTitle);
 mMap.addMarker(markerOptions);

Modify from last example "Set map type for Google Maps Activity using Google Maps Android API v2" to add feature to add markers on Google Maps Activity.

Edit values/strings.xml to add string resource of "menu_addmarkers"

<resources>
 <string name="app_name">AndroidStudioMapApp</string>
 <string name="title_activity_maps">Map</string>
 <string name="menu_legalnotices">Legal Notices</string>
 <string name="menu_about">About</string>
 <string name="menu_addmarkers">Add Markers</string>
</resources>

Edit menu/activity_main.xml, to add menu option of Add Markers:

<?xml version="1.0" encoding="utf-8"?>
<menu 
 >
 <item
 android_id="@+id/menu_about"
 android_orderInCategory="100"
 app_showAsAction="ifRoom"
 android_title="@string/menu_about"/>
 <item
 android_id="@+id/menu_addmarkers"
 android_orderInCategory="100"
 app_showAsAction="ifRoom"
 android_title="@string/menu_addmarkers"/>
 <item
 android_id="@+id/maptype"
 android_orderInCategory="100"
 app_showAsAction="never"
 android_title="Map Type...">
 <menu >
 <group android_id="@+id/groupmaptype"
 android_checkableBehavior="single">
 <item android_id="@+id/maptypeNORMAL"
 android_title="NORMAL" />
 <item android_id="@+id/maptypeSATELLITE"
 android_title="SATELLITE" />
 <item android_id="@+id/maptypeTERRAIN"
 android_title="TERRAIN" />
 <item android_id="@+id/maptypeHYBRID"
 android_title="HYBRID" />
 <item android_id="@+id/maptypeNONE"
 android_title="NONE" />

 </group>
 </menu>

 </item>
 <item
 android_id="@+id/menu_legalnotices"
 android_orderInCategory="100"
 app_showAsAction="never"
 android_title="@string/menu_legalnotices"/>


</menu>

Modify MapsActivity.java

package com.blogspot.android_er.androidstudiomapapp;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.InputType;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {

 private GoogleMap mMap;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_maps);
 // Obtain the SupportMapFragment and get notified when the map is ready to be used.
 SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
 .findFragmentById(R.id.map);
 mapFragment.getMapAsync(this);

 }

 /**
 * Manipulates the map once available.
 * This callback is triggered when the map is ready to be used.
 * This is where we can add markers or lines, add listeners or move the camera. In this case,
 * we just add a marker near Sydney, Australia.
 * If Google Play services is not installed on the device, the user will be prompted to install
 * it inside the SupportMapFragment. This method will only be triggered once the user has
 * installed Google Play services and returned to the app.
 */
 @Override
 public void onMapReady(GoogleMap googleMap) {
 mMap = googleMap;
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.activity_main, menu);
 return super.onCreateOptionsMenu(menu);
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
 switch (item.getItemId()) {
 case R.id.menu_addmarkers:
 addMarker();
 return true;
 case R.id.maptypeHYBRID:
 if(mMap != null){
 mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
 return true;
 }
 case R.id.maptypeNONE:
 if(mMap != null){
 mMap.setMapType(GoogleMap.MAP_TYPE_NONE);
 return true;
 }
 case R.id.maptypeNORMAL:
 if(mMap != null){
 mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
 return true;
 }
 case R.id.maptypeSATELLITE:
 if(mMap != null){
 mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
 return true;
 }
 case R.id.maptypeTERRAIN:
 if(mMap != null){
 mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
 return true;
 }
 case R.id.menu_legalnotices:
 String LicenseInfo = GoogleApiAvailability
 .getInstance()
 .getOpenSourceSoftwareLicenseInfo(MapsActivity.this);
 AlertDialog.Builder LicenseDialog =
 new AlertDialog.Builder(MapsActivity.this);
 LicenseDialog.setTitle("Legal Notices");
 LicenseDialog.setMessage(LicenseInfo);
 LicenseDialog.show();
 return true;
 case R.id.menu_about:
 AlertDialog.Builder aboutDialogBuilder =
 new AlertDialog.Builder(MapsActivity.this);
 aboutDialogBuilder.setTitle("About Me")
 .setMessage("http://android-er.blogspot.com");

 aboutDialogBuilder.setPositiveButton("visit",
 new DialogInterface.OnClickListener() {
 @Override
 public void onClick(DialogInterface dialog, int which) {
 String url = "http://android-er.blogspot.com";
 Intent i = new Intent(Intent.ACTION_VIEW);
 i.setData(Uri.parse(url));
 startActivity(i);
 }
 });

 aboutDialogBuilder.setNegativeButton("Dismiss",
 new DialogInterface.OnClickListener() {
 @Override
 public void onClick(DialogInterface dialog, int which) {
 dialog.cancel();
 }
 });

 AlertDialog aboutDialog = aboutDialogBuilder.create();
 aboutDialog.show();

 return true;
 }
 return super.onOptionsItemSelected(item);
 }

 private void addMarker(){
 if(mMap != null){

 //create custom LinearLayout programmatically
 LinearLayout layout = new LinearLayout(MapsActivity.this);
 layout.setLayoutParams(new LinearLayout.LayoutParams(
 LinearLayout.LayoutParams.MATCH_PARENT,
 LinearLayout.LayoutParams.WRAP_CONTENT));
 layout.setOrientation(LinearLayout.VERTICAL);

 final EditText titleField = new EditText(MapsActivity.this);
 titleField.setHint("Title");

 final EditText latField = new EditText(MapsActivity.this);
 latField.setHint("Latitude");
 latField.setInputType(InputType.TYPE_CLASS_NUMBER
 | InputType.TYPE_NUMBER_FLAG_DECIMAL
 | InputType.TYPE_NUMBER_FLAG_SIGNED);

 final EditText lonField = new EditText(MapsActivity.this);
 lonField.setHint("Longitude");
 lonField.setInputType(InputType.TYPE_CLASS_NUMBER
 | InputType.TYPE_NUMBER_FLAG_DECIMAL
 | InputType.TYPE_NUMBER_FLAG_SIGNED);

 layout.addView(titleField);
 layout.addView(latField);
 layout.addView(lonField);

 AlertDialog.Builder builder = new AlertDialog.Builder(this);
 builder.setTitle("Add Marker");
 builder.setView(layout);
 AlertDialog alertDialog = builder.create();

 builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
 @Override
 public void onClick(DialogInterface dialog, int which) {
 boolean parsable = true;
 Double lat = null, lon = null;

 String strLat = latField.getText().toString();
 String strLon = lonField.getText().toString();
 String strTitle = titleField.getText().toString();

 try{
 lat = Double.parseDouble(strLat);
 }catch (NumberFormatException ex){
 parsable = false;
 Toast.makeText(MapsActivity.this,
 "Latitude does not contain a parsable double",
 Toast.LENGTH_LONG).show();
 }

 try{
 lon = Double.parseDouble(strLon);
 }catch (NumberFormatException ex){
 parsable = false;
 Toast.makeText(MapsActivity.this,
 "Longitude does not contain a parsable double",
 Toast.LENGTH_LONG).show();
 }

 if(parsable){
 LatLng targetLatLng = new LatLng(lat, lon);
 MarkerOptions markerOptions =
 new MarkerOptions().position(targetLatLng).title(strTitle);
 mMap.addMarker(markerOptions);
 mMap.moveCamera(CameraUpdateFactory.newLatLng(targetLatLng));
 }
 }
 });
 builder.setNegativeButton("Cancel", null);

 builder.show();
 }else{
 Toast.makeText(MapsActivity.this, "Map not ready", Toast.LENGTH_LONG).show();
 }
 }
}

Download the files (Android Studio Format) .

Next:
- initialize map in xml

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~ Step-by-step of Android Google Maps Activity using Google Maps Android API v2, on Android Studio

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