From 01b44837f4f970246e800d46e57e4382eb17d065 Mon Sep 17 00:00:00 2001
From: JosJuice <josjuice@gmail.com>
Date: Sat, 15 Jun 2024 18:15:45 +0200
Subject: Android: Track whether app is in foreground

---
 .../dolphinemu/dolphinemu/DolphinApplication.java  |  2 ++
 .../dolphinemu/dolphinemu/utils/ActivityTracker.kt | 41 ++++++++++++++++++++++
 Source/Android/jni/ActivityTracker.cpp             | 21 +++++++++++
 Source/Android/jni/CMakeLists.txt                  |  3 +-
 4 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/ActivityTracker.kt
 create mode 100644 Source/Android/jni/ActivityTracker.cpp

(limited to 'Source/Android')

diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/DolphinApplication.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/DolphinApplication.java
index c197c002b0..e0816e408b 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/DolphinApplication.java
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/DolphinApplication.java
@@ -6,6 +6,7 @@ import android.app.Application;
 import android.content.Context;
 import android.hardware.usb.UsbManager;
 
+import org.dolphinemu.dolphinemu.utils.ActivityTracker;
 import org.dolphinemu.dolphinemu.utils.DirectoryInitialization;
 import org.dolphinemu.dolphinemu.utils.Java_GCAdapter;
 import org.dolphinemu.dolphinemu.utils.Java_WiimoteAdapter;
@@ -20,6 +21,7 @@ public class DolphinApplication extends Application
   {
     super.onCreate();
     application = this;
+    registerActivityLifecycleCallbacks(new ActivityTracker());
     VolleyUtil.init(getApplicationContext());
     System.loadLibrary("main");
 
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/ActivityTracker.kt b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/ActivityTracker.kt
new file mode 100644
index 0000000000..b3a6a5d91a
--- /dev/null
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/ActivityTracker.kt
@@ -0,0 +1,41 @@
+package org.dolphinemu.dolphinemu.utils
+
+import android.app.Activity
+import android.app.Application.ActivityLifecycleCallbacks
+import android.os.Bundle
+
+class ActivityTracker : ActivityLifecycleCallbacks {
+    val resumedActivities = HashSet<Activity>()
+    var backgroundExecutionAllowed = false
+
+    override fun onActivityCreated(activity: Activity, bundle: Bundle?) {}
+
+    override fun onActivityStarted(activity: Activity) {}
+
+    override fun onActivityResumed(activity: Activity) {
+        resumedActivities.add(activity)
+        if (!backgroundExecutionAllowed && !resumedActivities.isEmpty()) {
+            backgroundExecutionAllowed = true
+            setBackgroundExecutionAllowedNative(true)
+        }
+    }
+
+    override fun onActivityPaused(activity: Activity) {
+        resumedActivities.remove(activity)
+        if (backgroundExecutionAllowed && resumedActivities.isEmpty()) {
+            backgroundExecutionAllowed = false
+            setBackgroundExecutionAllowedNative(false)
+        }
+    }
+
+    override fun onActivityStopped(activity: Activity) {}
+
+    override fun onActivitySaveInstanceState(activity: Activity, bundle: Bundle) {}
+
+    override fun onActivityDestroyed(activity: Activity) {}
+
+    companion object {
+        @JvmStatic
+        external fun setBackgroundExecutionAllowedNative(allowed: Boolean)
+    }
+}
diff --git a/Source/Android/jni/ActivityTracker.cpp b/Source/Android/jni/ActivityTracker.cpp
new file mode 100644
index 0000000000..b871890576
--- /dev/null
+++ b/Source/Android/jni/ActivityTracker.cpp
@@ -0,0 +1,21 @@
+// Copyright 2024 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <jni.h>
+
+#include "Common/Logging/Log.h"
+#include "Core/AchievementManager.h"
+
+extern "C" {
+
+JNIEXPORT void JNICALL
+Java_org_dolphinemu_dolphinemu_utils_ActivityTracker_setBackgroundExecutionAllowedNative(
+    JNIEnv*, jclass, jboolean allowed)
+{
+  // This is called with allowed == false when the app goes into the background.
+  // We use this to stop continuously running background threads so we don't waste battery.
+
+  INFO_LOG_FMT(CORE, "SetBackgroundExecutionAllowed {}", allowed);
+  AchievementManager::GetInstance().SetBackgroundExecutionAllowed(allowed);
+}
+}
diff --git a/Source/Android/jni/CMakeLists.txt b/Source/Android/jni/CMakeLists.txt
index ab2acc7063..7ddae94c07 100644
--- a/Source/Android/jni/CMakeLists.txt
+++ b/Source/Android/jni/CMakeLists.txt
@@ -1,4 +1,5 @@
 add_library(main SHARED
+  ActivityTracker.cpp
   Cheats/ARCheat.cpp
   Cheats/Cheats.h
   Cheats/GeckoCheat.cpp
@@ -11,6 +12,7 @@ add_library(main SHARED
   GameList/GameFile.cpp
   GameList/GameFile.h
   GameList/GameFileCache.cpp
+  GpuDriver.cpp
   Host.cpp
   Host.h
   InfinityConfig.cpp
@@ -32,7 +34,6 @@ add_library(main SHARED
   RiivolutionPatches.cpp
   SkylanderConfig.cpp
   WiiUtils.cpp
-  GpuDriver.cpp
 )
 
 target_link_libraries(main
-- 
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