wip: add game back menu

Add back menu to send sepcial keys. E.g. close fullscreen while using yuzu.

app/src/main/java/com/limelight/Game.java

@@ -39,10 +39,12 @@
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.app.PictureInPictureParams;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.content.SharedPreferences;
@@ -63,7 +65,10 @@
 import android.view.Display;
 import android.view.InputDevice;
 import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.Menu;
 import android.view.MotionEvent;
+import android.view.SubMenu;
 import android.view.Surface;
 import android.view.SurfaceHolder;
 import android.view.View;
@@ -72,12 +77,15 @@
 import android.view.View.OnTouchListener;
 import android.view.Window;
 import android.view.WindowManager;
+import android.widget.ArrayAdapter;
 import android.widget.FrameLayout;
 import android.view.inputmethod.InputMethodManager;
+import android.widget.PopupMenu;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import java.io.ByteArrayInputStream;
+import java.io.PipedOutputStream;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.security.cert.CertificateException;
@@ -2264,7 +2272,16 @@ public void onUsbPermissionPromptCompleted() {
     public boolean onKey(View view, int keyCode, KeyEvent keyEvent) {
         switch (keyEvent.getAction()) {
             case KeyEvent.ACTION_DOWN:
-                return handleKeyDown(keyEvent);
+                boolean handled = handleKeyDown(keyEvent);
+                if (handled)
+                    return true;
+
+                // Intercept back key event before android handles it
+                // Always handle the request, the user has to select "Disconnect" within the back menu to actually disconnect
+                if (keyCode == keyEvent.KEYCODE_BACK) {
+                    new GameBackMenu(this, conn);
+                    return true;
+                }
             case KeyEvent.ACTION_UP:
                 return handleKeyUp(keyEvent);
             default:

app/src/main/java/com/limelight/GameBackMenu.java

@@ -0,0 +1,98 @@
+package com.limelight;
+
+import android.app.AlertDialog;
+import android.widget.ArrayAdapter;
+
+import com.limelight.nvstream.NvConnection;
+import com.limelight.nvstream.input.KeyboardPacket;
+
+public class GameBackMenu {
+
+    private final Game game;
+    private final NvConnection conn;
+
+    public GameBackMenu(Game game, NvConnection conn) {
+        this.game = game;
+        this.conn = conn;
+
+        showMenuDialog("Back Menu", new MenuDialogOption[]{
+                new MenuDialogOption("Send special key(s)", () -> showSpecialKeysMenu()),
+                new MenuDialogOption("Disconnect", () -> game.onBackPressed()),
+                new MenuDialogOption("Cancel", null),
+        });
+    }
+
+    private void sendKeySequence(byte modifier, short[] keys) {
+
+        for (short key : keys)
+            conn.sendKeyboardInput(key, KeyboardPacket.KEY_DOWN, (byte) (modifier | KeyboardPacket.KEY_DOWN));
+
+        for (int pos = keys.length - 1; pos >= 0; pos--)
+            conn.sendKeyboardInput(keys[pos], KeyboardPacket.KEY_UP, (byte) (modifier | KeyboardPacket.KEY_UP));
+    }
+
+    private void showMenuDialog(String title, MenuDialogOption[] options) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(game);
+        builder.setTitle(title);
+
+        final ArrayAdapter<String> actions =
+                new ArrayAdapter<String>(game, android.R.layout.simple_list_item_1);
+
+        for (MenuDialogOption option : options) {
+            actions.add(option.label);
+        }
+
+        builder.setAdapter(actions, (dialog, which) -> {
+            String label = actions.getItem(which);
+            for (MenuDialogOption option : options) {
+                if (!label.equals(option.label)) {
+                    continue;
+                }
+
+                if (option.runnable != null) {
+                    option.runnable.run();
+                }
+                break;
+            }
+        });
+
+        builder.show();
+    }
+
+    private void showSpecialKeysMenu() {
+        showMenuDialog(ACTIONS.SEND_SPECIAL_KEYS, new MenuDialogOption[]{
+                new MenuDialogOption("Send ESC", () -> sendKeySequence(
+                        (byte) 0, new short[]{0x18})),
+                new MenuDialogOption("Send F11", () -> sendKeySequence(
+                        (byte) 0, new short[]{0x7a})),
+                new MenuDialogOption("Send WIN (Open Start Menu)", () -> sendKeySequence(
+                        (byte) 0, new short[]{0x5B})),
+                new MenuDialogOption("Send WIN + D (Switch to Desktop)", () -> sendKeySequence(
+                        (byte) 0, new short[]{0x5B, 0x44})),
+                new MenuDialogOption("Send WIN + G (Open Xbox Game Bar)", () -> sendKeySequence(
+                        (byte) 0, new short[]{0x5B, 0x47})),
+                /*
+                TODO: Currently not working
+                new MenuDialogOption("Send SHIFT + TAB (Open Steam Overlay)", () -> sendKeySequence(
+                        (byte) 0, new short[]{0xA0, 0x09})),
+                */
+                new MenuDialogOption("Cancel", null),
+        });
+    }
+
+    private interface ACTIONS {
+        String CONTINUE = "Continue";
+        String SEND_SPECIAL_KEYS = "Send special key(s)";
+        String DISCONNECT = "Disconnect";
+    }
+
+    private class MenuDialogOption {
+        private final String label;
+        private final Runnable runnable;
+
+        MenuDialogOption(String label, Runnable runnable) {
+            this.label = label;
+            this.runnable = runnable;
+        }
+    }
+}