Detect user click on InfoWindow, by implementing GoogleMap.OnInfoWindowClickListener()

To detect user tap on Google Maps InfoWindow, implement your GoogleMap.OnInfoWindowClickListener() and call GoogleMap.setOnInfoWindowClickListener(OnInfoWindowClickListener).
Modify from last example "Custom InfoWindow for Google Maps Android API v2":

MapsActivity.java
package com.blogspot.android_er.androidstudiomapapp;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.drawable.Drawable;
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.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
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.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback,
        GoogleMap.OnMapClickListener, GoogleMap.OnMapLongClickListener,
        GoogleMap.OnMarkerDragListener, GoogleMap.InfoWindowAdapter {

    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;
        mMap.setOnMapClickListener(this);
        mMap.setOnMapLongClickListener(this);
        mMap.setOnMarkerDragListener(this);
        mMap.setInfoWindowAdapter(this);
        mMap.setOnInfoWindowClickListener(MyOnInfoWindowClickListener);
    }

    @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);

                        markerOptions.draggable(true);

                        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();
        }
    }

    @Override
    public void onMapClick(LatLng latLng) {
        Toast.makeText(MapsActivity.this,
                "onMapClick:\n" + latLng.latitude + " : " + latLng.longitude,
                Toast.LENGTH_LONG).show();
    }

    @Override
    public void onMapLongClick(LatLng latLng) {
        Toast.makeText(MapsActivity.this,
                "onMapLongClick:\n" + latLng.latitude + " : " + latLng.longitude,
                Toast.LENGTH_LONG).show();

        //Add marker on LongClick position
        MarkerOptions markerOptions =
                new MarkerOptions().position(latLng).title(latLng.toString());
        markerOptions.draggable(true);

        mMap.addMarker(markerOptions);
    }


    @Override
    public void onMarkerDragStart(Marker marker) {
        marker.setTitle(marker.getPosition().toString());
        marker.showInfoWindow();
        marker.setAlpha(0.5f);
    }

    @Override
    public void onMarkerDrag(Marker marker) {
        marker.setTitle(marker.getPosition().toString());
        marker.showInfoWindow();
        marker.setAlpha(0.5f);
    }

    @Override
    public void onMarkerDragEnd(Marker marker) {
        marker.setTitle(marker.getPosition().toString());
        marker.showInfoWindow();
        marker.setAlpha(1.0f);
    }

    @Override
    public View getInfoWindow(Marker marker) {
        return null;
        //return prepareInfoView(marker);
    }

    @Override
    public View getInfoContents(Marker marker) {
        //return null;
        return prepareInfoView(marker);

    }

    private View prepareInfoView(Marker marker){
        //prepare InfoView programmatically
        LinearLayout infoView = new LinearLayout(MapsActivity.this);
        LinearLayout.LayoutParams infoViewParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        infoView.setOrientation(LinearLayout.HORIZONTAL);
        infoView.setLayoutParams(infoViewParams);

        ImageView infoImageView = new ImageView(MapsActivity.this);
        //Drawable drawable = getResources().getDrawable(R.mipmap.ic_launcher);
        Drawable drawable = getResources().getDrawable(android.R.drawable.ic_dialog_map);
        infoImageView.setImageDrawable(drawable);
        infoView.addView(infoImageView);

        LinearLayout subInfoView = new LinearLayout(MapsActivity.this);
        LinearLayout.LayoutParams subInfoViewParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        subInfoView.setOrientation(LinearLayout.VERTICAL);
        subInfoView.setLayoutParams(subInfoViewParams);

        TextView subInfoLat = new TextView(MapsActivity.this);
        subInfoLat.setText("Lat: " + marker.getPosition().latitude);
        TextView subInfoLnt = new TextView(MapsActivity.this);
        subInfoLnt.setText("Lnt: " + marker.getPosition().longitude);
        subInfoView.addView(subInfoLat);
        subInfoView.addView(subInfoLnt);
        infoView.addView(subInfoView);

        return infoView;
    }

    GoogleMap.OnInfoWindowClickListener MyOnInfoWindowClickListener
            = new GoogleMap.OnInfoWindowClickListener(){
        @Override
        public void onInfoWindowClick(Marker marker) {
            Toast.makeText(MapsActivity.this,
                    "onInfoWindowClick():\n" +
                    marker.getPosition().latitude + "\n" +
                    marker.getPosition().longitude,
                    Toast.LENGTH_LONG).show();
        }
    };

}