From a97e9addf0f3a465c6a8b1db1aab38829b902a42 Mon Sep 17 00:00:00 2001
From: sigmabeta <sigmabeta@users.noreply.github.com>
Date: Sun, 7 Jun 2015 23:11:34 -0400
Subject: [PATCH] Android: Show the in-game menu when back button is pushed.

---
 .../activities/EmulationActivity.java         | 29 +++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.java
index de7ebb17d3..7b0d4057f6 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.java
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.java
@@ -25,6 +25,9 @@ public final class EmulationActivity extends Activity
 {
 	private View mDecorView;
 
+	private boolean mDeviceHasTouchScreen;
+	private boolean mSystemUiVisible;
+
 	/**
 	 * Handlers are a way to pass a message to an Activity telling it to do something
 	 * on the UI thread. This Handler responds to any message, even blank ones, by
@@ -44,6 +47,8 @@ public final class EmulationActivity extends Activity
 	{
 		super.onCreate(savedInstanceState);
 
+		mDeviceHasTouchScreen = getPackageManager().hasSystemFeature("android.hardware.touchscreen");
+
 		// Get a handle to the Window containing the UI.
 		mDecorView = getWindow().getDecorView();
 
@@ -59,9 +64,9 @@ public final class EmulationActivity extends Activity
 					@Override
 					public void onSystemUiVisibilityChange(int flags)
 					{
-						boolean visible = (flags & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0;
+						mSystemUiVisible = (flags & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0;
 
-						if (visible)
+						if (mSystemUiVisible)
 						{
 							getActionBar().show();
 							hideSystemUiAfterDelay();
@@ -117,6 +122,20 @@ public final class EmulationActivity extends Activity
 		}
 	}
 
+	@Override
+	public void onBackPressed()
+	{
+		if (!mDeviceHasTouchScreen && !mSystemUiVisible)
+		{
+			showSystemUI();
+		}
+		else
+		{
+			// Let the system handle it; i.e. quit the activity TODO or show "are you sure?" dialog.
+			super.onBackPressed();
+		}
+	}
+
 	@Override
 	public boolean onCreateOptionsMenu(Menu menu)
 	{
@@ -275,6 +294,8 @@ public final class EmulationActivity extends Activity
 
 	private void hideSystemUI()
 	{
+		mSystemUiVisible = false;
+
 		mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
 				View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
 				View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
@@ -285,8 +306,12 @@ public final class EmulationActivity extends Activity
 
 	private void showSystemUI()
 	{
+		mSystemUiVisible = true;
+
 		mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
 				View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
 				View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+
+		hideSystemUiAfterDelay();
 	}
 }