How to open a Infowindow on every marker (multiple marker) in android?

Question

Since I am using Google map v2 and I want to open info window on multiple makers. I have done this with single marker, and also used show info window(); but it works in on last marker and on only one. I want only and only in android.

public class MainActivity extends FragmentActivity {

    private GoogleMap googleMap;
    private final LatLng HAMBURG = new LatLng(53.558, 9.927);
    private final LatLng KIEL = new LatLng(53.551, 9.993);
    private Marker marker;
    private Hashtable<String, String> markers;
    private ImageLoader imageLoader;
    private DisplayImageOptions options;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();

        initImageLoader();
        markers = new Hashtable<String, String>();
        imageLoader = ImageLoader.getInstance();

        options = new DisplayImageOptions.Builder()
            .showStubImage(R.drawable.ic_launcher)      //  Display Stub Image
            .showImageForEmptyUri(R.drawable.ic_launcher)   //  If Empty image found
            .cacheInMemory()
            .cacheOnDisc().bitmapConfig(Bitmap.Config.RGB_565).build();

        if ( googleMap != null ) {

            googleMap.setInfoWindowAdapter(new CustomInfoWindowAdapter());

            final Marker hamburg = googleMap.addMarker(new MarkerOptions().position(HAMBURG)
                        .title("Hamburg"));
            hamburg.showInfoWindow();
            markers.put(hamburg.getId(), "http://img.india-forums.com/images/100x100/37525-a-still-image-of-akshay-kumar.jpg");

            final Marker kiel = googleMap.addMarker(new MarkerOptions()
                        .position(KIEL)
                        .title("Kiel")
                        .snippet("Kiel is cool")
                        .icon(BitmapDescriptorFactory
                            .fromResource(R.drawable.ic_launcher)));
            markers.put(kiel.getId(), "http://www.yodot.com/images/jpeg-images-sm.png");
            //kiel.showInfoWindow();

            googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
            googleMap.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
        }
    }

    private class CustomInfoWindowAdapter implements InfoWindowAdapter {

        private View view;

        public CustomInfoWindowAdapter() {
            view = getLayoutInflater().inflate(R.layout.custom_info_window,
                    null);
        }

        @Override
        public View getInfoContents(Marker marker) {

            if (MainActivity.this.marker != null
                    && MainActivity.this.marker.isInfoWindowShown()) {
                MainActivity.this.marker.hideInfoWindow();
                MainActivity.this.marker.showInfoWindow();
            }
            return null;
        }

        @Override
        public View getInfoWindow(final Marker marker) {
            MainActivity.this.marker = marker;

            String url = null;

            if (marker.getId() != null && markers != null && markers.size() > 0) {
                if ( markers.get(marker.getId()) != null &&
                        markers.get(marker.getId()) != null) {
                    url = markers.get(marker.getId());
                }
            }
            final ImageView image = ((ImageView) view.findViewById(R.id.badge));

            if (url != null && !url.equalsIgnoreCase("null")
                    && !url.equalsIgnoreCase("")) {
                imageLoader.displayImage(url, image, options,
                        new SimpleImageLoadingListener() {
                            @Override
                            public void onLoadingComplete(String imageUri,
                                    View view, Bitmap loadedImage) {
                                super.onLoadingComplete(imageUri, view,
                                        loadedImage);
                                getInfoContents(marker);
                            }
                        });
            } else {
                image.setImageResource(R.drawable.ic_launcher);
            }

            final String title = marker.getTitle();
            final TextView titleUi = ((TextView) view.findViewById(R.id.title));
            if (title != null) {
                titleUi.setText(title);
            } else {
                titleUi.setText("");
            }

            final String snippet = marker.getSnippet();
            final TextView snippetUi = ((TextView) view
                    .findViewById(R.id.snippet));
            if (snippet != null) {
                snippetUi.setText(snippet);
            } else {
                snippetUi.setText("");
            }

            return view;
        }
    }

    private void initImageLoader() {
        int memoryCacheSize;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ECLAIR) {
            int memClass = ((ActivityManager) 
                    getSystemService(Context.ACTIVITY_SERVICE))
                    .getMemoryClass();
            memoryCacheSize = (memClass / 8) * 1024 * 1024;
        } else {
            memoryCacheSize = 2 * 1024 * 1024;
        }

        final ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
                this).threadPoolSize(5)
                .threadPriority(Thread.NORM_PRIORITY - 2)
                .memoryCacheSize(memoryCacheSize)
                .memoryCache(new FIFOLimitedMemoryCache(memoryCacheSize-1000000))
                .denyCacheImageMultipleSizesInMemory()
                .discCacheFileNameGenerator(new Md5FileNameGenerator())
                .tasksProcessingOrder(QueueProcessingType.LIFO).enableLogging() 
                .build();

        ImageLoader.getInstance().init(config);
    }
}

Answer 1

The default markers can only show one info window at a time. However, you can easily show more, using the Maps Android library: https://developers.google.com/maps/documentation/android-api/utility/

Here is an example:

IconGenerator iconFactory = new IconGenerator(this);
mMarkerA = mMap.addMarker(new MarkerOptions().position(new LatLng(12, 34)));
mMarkerA.setIcon(BitmapDescriptorFactory.fromBitmap(iconFactory.makeIcon("Marker A")));
mMarkerB = mMap.addMarker(new MarkerOptions().position(new LatLng(13, 35)));
mMarkerB.setIcon(BitmapDescriptorFactory.fromBitmap(iconFactory.makeIcon("Marker B")));

And add

compile 'com.google.maps.android:android-maps-utils:0.4+'

to your gradle file.