As reported in https://bitbucket.org/javafxports/android/issue/20/ensemble8-app-should-react-to-hardware Ensemble8 on Android should react to the (hardware) menu and back buttons.

The following patch implements the these actions:
1. (Hardware) Menu button: open/close menu (depends on RT-35146)
2. (Hardware) Back button:
   - If menu is open -> close menu
   - If back button is enabled -> go back
   - If clicked twice -> exit app

Note that the proposed change is currently not restricted to embedded mode.
Therefore the "windows" menu button (available on some keyboards) and the esc button trigger the same actions on desktops.

diff -r 22f7e87e105b -r ac3dd00995ba apps/samples/Ensemble8/src/app/java/ensemble/EnsembleApp.java
--- a/apps/samples/Ensemble8/src/app/java/ensemble/EnsembleApp.java Sat Dec 28 04:28:42 2013 +0100
+++ b/apps/samples/Ensemble8/src/app/java/ensemble/EnsembleApp.java Sat Dec 28 04:39:10 2013 +0100
@@ -36,6 +36,7 @@
 import ensemble.control.SearchBox;
 import ensemble.control.TitledToolBar;
 import ensemble.generated.Samples;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.Reader;
@@ -45,6 +46,7 @@
 import java.nio.channels.ReadableByteChannel;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+
 import javafx.application.Application;
 import javafx.application.Platform;
 import javafx.event.ActionEvent;
@@ -56,6 +58,8 @@
 import javafx.scene.Parent;
 import javafx.scene.Scene;
 import javafx.scene.control.*;
+import javafx.scene.input.KeyCode;
+import javafx.scene.input.KeyEvent;
 import javafx.scene.input.MouseEvent;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.Pane;
@@ -231,6 +235,50 @@
             }
         });
         
+ // create AndroidStyle Menuhandling
+ root.setOnKeyReleased(new EventHandler<KeyEvent>() {
+ private int exitCount = 0;
+
+ @Override
+ public void handle(KeyEvent event) {
+ if (event.getCode() == KeyCode.ESCAPE) {
+ if (sampleListPopover.isVisible()) {
+ sampleListPopover.hide();
+ event.consume();
+ return;
+ }
+
+ if (!backButton.isDisabled()) {
+ pageBrowser.backward();
+ event.consume();
+ return;
+ }
+ exitCount++;
+ if (exitCount == 2) {
+ System.exit(0);
+ }
+ } else {
+ exitCount = 0;
+ }
+
+ if (event.getCode() == KeyCode.CONTEXT_MENU) {
+ if (sampleListPopover.isVisible()) {
+ sampleListPopover.hide();
+ } else {
+ sampleListPopover.clearPages();
+ sampleListPopover.pushPage(rootPage);
+ sampleListPopover.show(new Runnable() {
+ @Override
+ public void run() {
+ listButton.setSelected(false);
+ }
+ });
+ }
+ event.consume();
+ }
+ }
+ });
+
         // create and setup search popover
         searchPopover = new SearchPopover(searchBox,pageBrowser);
         root.getChildren().add(searchPopover);