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 xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<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
~ Step-by-step of Android Google Maps Activity using Google Maps Android API v2, on Android Studio
