Custom InfoWindow for Google Maps Android API v2

To create Custom InfoWindow for Google Maps Android API v2:

- Make your Activity implements GoogleMap.InfoWindowAdapter.

- Override getInfoWindow(Marker marker) and getInfoContents(Marker marker).

The API will first call getInfoWindow(Marker) and if null is returned, it will then call getInfoContents(Marker). If this also returns null, then the default info window will be used.

The first of these (getInfoWindow()) allows you to provide a view that will be used for the entire info window. The second of these (getInfoContents()) allows you to just customize the contents of the window but still keep the default info window frame and background.

- setInfoWindowAdapter(this).

Modify MapsActivity.java from last example "Make GoogleMap's marker draggabe and detect moving marker".
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);
    }

    @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;
    }
}