将适应性功能集成到原生游戏中

// CODELAB: ADPFSampleActivity.java onResume
if (Build.VERSION.SDK_INT >= VERSION_CODES.Q) {
   PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
      if (pm != null) {
         pm.addThermalStatusListener(this);
      }
}

// CODELAB: ADPFSampleActivity.java onResume
if (Build.VERSION.SDK_INT >= VERSION_CODES.R) {
   // Use NDK Thermal API.
   nativeRegisterThermalStatusListener();
}

// CODELAB: ADPFSampleActivity.java onPause
// unregister the listener when it is no longer needed
// Remove the thermal state change listener on pause.
if (Build.VERSION.SDK_INT >= VERSION_CODES.R) {
   // Use NDK Thermal API.
   nativeUnregisterThermalStatusListener();
} else if (Build.VERSION.SDK_INT >= VERSION_CODES.Q) {
   PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
   if (pm != null) {
      pm.removeThermalStatusListener(this);
   }
}

// CODELAB: ADPFSampleActivity.java
// Keep a copy of ADPFManager instance
private ADPFManager adpfManager;

// in onCreate, create an instance of ADPFManager
@Override
protected void onCreate(Bundle savedInstanceState) {
   // Instantiate ADPF manager.
   this.adpfManager = new ADPFManager();
   super.onCreate(savedInstanceState);
}

@Override
protected void onResume() {
   // Register ADPF thermal status listener on resume.
   this.adpfManager.registerListener(getApplicationContext());
   super.onResume();
}

@Override
protected void onPause() {
   // Remove ADPF thermal status listener on resume.
  this.adpfManager.unregisterListener(getApplicationContext());
   super.onPause();
}

// CODELAB: android_main.cpp
// Remove the thermal state change listener on pause.
// Register classes to Java.
jint JNI_OnLoad(JavaVM *vm, void * /* reserved */) {
  JNIEnv *env;
  if (vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6) != JNI_OK) {
    return JNI_ERR;
  }

  // Find your class. JNI_OnLoad is called from the correct class loader context
  // for this to work.
  jclass c = env->FindClass("com/android/example/games/ADPFManager");
  if (c == nullptr) return JNI_ERR;

  // Register your class' native methods.
  static const JNINativeMethod methods[] = {
      {"nativeThermalStatusChanged", "(I)V",
       reinterpret_cast<void *>(nativeThermalStatusChanged)},
      {"nativeRegisterThermalStatusListener", "()V",
       reinterpret_cast<void *>(nativeRegisterThermalStatusListener)},
      {"nativeUnregisterThermalStatusListener", "()V",
       reinterpret_cast<void *>(nativeUnregisterThermalStatusListener)},
  };
  int rc = env->RegisterNatives(c, methods,
                                sizeof(methods) / sizeof(JNINativeMethod));

  if (rc != JNI_OK) return rc;

  return JNI_VERSION_1_6;
}

// CODELAB: adpf_manager.h
// Forward declarations of functions that need to be in C decl.
extern "C" {
   void nativeThermalStatusChanged(JNIEnv* env, jclass cls, int32_t thermalState);
   void nativeRegisterThermalStatusListener(JNIEnv* env, jclass cls);
   void nativeUnregisterThermalStatusListener(JNIEnv* env, jclass cls);
}

typedef void (*thermalStateChangeListener)(int32_t, int32_t);

// CODELAB: adpf_manager.cpp
// Native callback for thermal status change listener.
// The function is called from Activity implementation in Java.
void nativeThermalStatusChanged(JNIEnv *env, jclass cls, jint thermalState) {
  ALOGI("Thermal Status updated to:%d", thermalState);
  ADPFManager::getInstance().SetThermalStatus(thermalState);
}

void nativeRegisterThermalStatusListener(JNIEnv *env, jclass cls) {
  auto manager = ADPFManager::getInstance().GetThermalManager();
  if (manager != nullptr) {
    auto ret = AThermal_registerThermalStatusListener(manager, thermal_callback,
                                                      nullptr);
    ALOGI("Thermal Status callback registered to:%d", ret);
  }
}

void nativeUnregisterThermalStatusListener(JNIEnv *env, jclass cls) {
  auto manager = ADPFManager::getInstance().GetThermalManager();
  if (manager != nullptr) {
    auto ret = AThermal_unregisterThermalStatusListener(
        manager, thermal_callback, nullptr);
    ALOGI("Thermal Status callback unregistered to:%d", ret);
  }
}

// CODELAB: adpf_manager.cpp
// Initialize JNI calls for the powermanager.
bool ADPFManager::InitializePowerManager() {
  if (android_get_device_api_level() >= 30) {
    // Initialize the powermanager using NDK API.
    thermal_manager_ = AThermal_acquireManager();
    return true;
  }

  JNIEnv *env = NativeEngine::GetInstance()->GetJniEnv();

  // Retrieve class information
  jclass context = env->FindClass("android/content/Context");

  // Get the value of a constant
  jfieldID fid =
      env->GetStaticFieldID(context, "POWER_SERVICE", "Ljava/lang/String;");
  jobject str_svc = env->GetStaticObjectField(context, fid);

  // Get the method 'getSystemService' and call it
  jmethodID mid_getss = env->GetMethodID(
      context, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");
  jobject obj_power_service = env->CallObjectMethod(
      app_->activity->javaGameActivity, mid_getss, str_svc);

  // Add global reference to the power service object.
  obj_power_service_ = env->NewGlobalRef(obj_power_service);

  jclass cls_power_service = env->GetObjectClass(obj_power_service_);
  get_thermal_headroom_ =
      env->GetMethodID(cls_power_service, "getThermalHeadroom", "(I)F");

  // Free references
  env->DeleteLocalRef(cls_power_service);
  env->DeleteLocalRef(obj_power_service);
  env->DeleteLocalRef(str_svc);
  env->DeleteLocalRef(context);

  if (get_thermal_headroom_ == 0) {
    // The API is not supported in the platform version.
    return false;
  }

  return true;
}

// CODELAB: adpf_manager.cpp
// Invoke the API first to set the android_app instance.
void ADPFManager::SetApplication(android_app *app) {
  app_.reset(app);

  // Initialize PowerManager reference.
  InitializePowerManager();
}

// CODELAB: android_main.cpp
void android_main(struct android_app *app) {
  std::shared_ptr<NativeEngine> engine(new NativeEngine(app));

  // Set android_app to ADPF manager, which in turn will call InitializePowerManager
  ADPFManager::getInstance().SetApplication(app);

  ndk_helper::JNIHelper::Init(app);

  engine->GameLoop();
}

// CODELAB: adpf_manager.cpp
// Invoke the method periodically (once a frame) to monitor
// the device's thermal throttling status.
void ADPFManager::Monitor() {
  float current_clock = Clock();
  if (current_clock - last_clock_ >= kThermalHeadroomUpdateThreshold) {
    // Update thermal headroom.
    UpdateThermalStatusHeadRoom();
    last_clock_ = current_clock;
  }
}

// CODELAB: adpf_manager.cpp
// Retrieve current thermal headroom using JNI call.
float ADPFManager::UpdateThermalStatusHeadRoom() {
  if (android_get_device_api_level() >= 30) {
    // Use NDK API to retrieve thermal status headroom.
    thermal_headroom_ = AThermal_getThermalHeadroom(
        thermal_manager_, kThermalHeadroomUpdateThreshold);
    return thermal_headroom_;
  }

  if (app_ == nullptr || get_thermal_headroom_ == 0) {
    return 0.f;
  }
  JNIEnv *env = NativeEngine::GetInstance()->GetJniEnv();

  // Get thermal headroom!
  thermal_headroom_ =
      env->CallFloatMethod(obj_power_service_, get_thermal_headroom_,
                           kThermalHeadroomUpdateThreshold);
  ALOGE("Current thermal Headroom %f", thermal_headroom_);
  return thermal_headroom_;
}

// CODELAB: adpf_manager.cpp
thermalStateChangeListener thermalListener = NULL;

void ADPFManager::SetThermalStatus(int32_t i) {
  int32_t prev_status_ = thermal_status_;
  int32_t current_status_ = i;
  thermal_status_ = i;
  if ( thermalListener != NULL ) {
    thermalListener(prev_status_, current_status_ );
  }
}

void ADPFManager::SetThermalListener(thermalStateChangeListener listener)
{
  thermalListener = listener;
}

// CODELAB: CMakeLists.txt
# now build app's shared lib
add_library(game SHARED
        adpf_manager.cpp # add this line
        android_main.cpp
        box_renderer.cpp
        demo_scene.cpp

// CODELAB: demo_scene.cpp
// String labels that represents thermal states.
const char* thermal_state_label[] = {
    "THERMAL_STATUS_NONE",     "THERMAL_STATUS_LIGHT",
    "THERMAL_STATUS_MODERATE", "THERMAL_STATUS_SEVERE",
    "THERMAL_STATUS_CRITICAL", "THERMAL_STATUS_EMERGENCY",
    "THERMAL_STATUS_SHUTDOWN"};

const int32_t thermal_state_physics_steps[] = {
        16, 12, 8, 4,
};
const int32_t thermal_state_array_size[] = {
        8, 6, 4, 2,
};

// CODELAB: demo_scene.cpp
// Dedicate a function to listen to the thermal state changed
void DemoScene::on_thermal_state_changed(int32_t last_state, int32_t current_state)
{
  if ( last_state != current_state ) {
    demo_scene_instance_->AdaptThermalLevel(current_state);
  }
}

...

// remember to pass it to the ADPFManager class we've just created, place this in DemoScene constructor: 
ADPFManager::getInstance().SetThermalListener(on_thermal_state_changed);

// CODELAB: demo_scene.cpp
// Adapt your game when the thermal status has changed
void DemoScene::AdaptThermalLevel(int32_t index) {
  int32_t current_index = index;
  int32_t array_size = sizeof(thermal_state_physics_steps) / sizeof(thermal_state_physics_steps[0]);
  if ( current_index < 0 ) {
    current_index = 0;
  } else if ( current_index >= array_size ) {
    current_index = array_size - 1;
  }

  ALOGI("AdaptThermalLevel: %d", current_index);

  // in this sample, we are reducing the physics step when the device heated
  current_physics_step_ = thermal_state_physics_steps[current_index];
  // and also reduce the number of objects in the world
  // your situation may be different, you can reduce LOD to remove some calculations for example...
  int32_t new_array_size_ = thermal_state_array_size[current_index];

  if ( new_array_size_ != array_size_ ) {
      recreate_physics_obj_ = true;
  }
}

// CODELAB: AndroidManifest.xml
<application
   android:appCategory="game">

// CODELAB: AndroidManifest.xml
   <!-- ENABLING GAME MODES -->
   <!-- Add this <meta-data> under your <application> tag to enable Game Mode API if you're targeting API Level 33 (recommended) -->
   <meta-data android:name="android.game_mode_config"
        android:resource="@xml/game_mode_config" />

// CODELAB: app/src/main/res/xml/game_mode_config.xml
<?xml version="1.0" encoding="UTF-8"?>
<game-mode-config
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:supportsBatteryGameMode="true"
    android:supportsPerformanceGameMode="true" />

// CODELAB: AndroidManifest.xml
   <!-- Use meta-data below instead if you are targeting API Level 31 or 32; you do not need to apply the 2 steps prior -->
   <meta-data android:name="com.android.app.gamemode.performance.enabled"
      android:value="true"/>
   <meta-data
      android:name="com.android.app.gamemode.battery.enabled"
      android:value="true"/>

// CODELAB: GameModeManager.java
// Abstract the functionality in GameModeManager so we can easily reuse in other games
public class GameModeManager {

    private Context context;
    private int gameMode;

    public void initialize(Context context) {
        this.context = context;
        this.gameMode = GameManager.GAME_MODE_UNSUPPORTED;
        if ( context != null ) {
            if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.S ) {
                // Get GameManager from SystemService
                GameManager gameManager = context.getSystemService(GameManager.class);

                // Returns the selected GameMode
                gameMode = gameManager.getGameMode();
            }
        }
        // tell the native game about the selected gameMode
        this.retrieveGameMode(this.gameMode);
    }

    protected native void retrieveGameMode(int gameMode);
}

// CODELAB: ADPFSampleActivity.java
// we may keep and cache the object as class member variable
private GameModeManager gameModeManager;

...

@Override
protected void onCreate(Bundle savedInstanceState) {
   ...
   // Instantiate our GameModeManager
   this.gameModeManager = new GameModeManager();
   ...
   super.onCreate(savedInstanceState);
}

...

@Override
protected void onResume() {
   ...
   this.gameModeManager.initialize(getApplicationContext());
   ...
   super.onResume();
}

// CODELAB: game_mode_manager.h
class GameModeManager {
 public:
  // Singleton function.
  static GameModeManager& getInstance() {
    static GameModeManager instance;
    return instance;
  }
  // Dtor. Remove global reference (if any).
  ~GameModeManager() {}

  // Delete copy constructor since the class is used as a singleton.
  GameModeManager(GameModeManager const&) = delete;
  void operator=(GameModeManager const&) = delete;

  void SetGameMode(int game_mode) { game_mode_ = game_mode; }
  int GetGameMode() { return game_mode_; }

 private:
  // Ctor. It's private since the class is designed as a singleton.
  GameModeManager() {}

  int game_mode_ = 0;
};

// CODELAB: game_mode_manager.cpp
extern "C" {

void Java_com_android_example_games_GameModeManager_retrieveGameMode(
    JNIEnv* env, jobject obj, jint game_mode) {
  GameModeManager& gmm = GameModeManager::getInstance();
  int old_game_mode = gmm.GetGameMode();
  ALOGI("GameMode updated from %d to:%d", old_game_mode, game_mode);
  GameModeManager::getInstance().SetGameMode(game_mode);
}

}

// CODELAB: CMakeLists.txt
# now build app's shared lib
add_library(game SHARED
        game_mode_manager.cpp # add this line
        android_main.cpp
        box_renderer.cpp
        demo_scene.cpp

// CODELAB: demo_scene.cpp
void DemoScene::RenderPanel() {
  ...
  GameModeManager& game_mode_manager = GameModeManager::getInstance();
  // Show the stat changes according to selected Game Mode
  ImGui::Text("Game Mode: %d", game_mode_manager.GetGameMode());
}

// CODELAB: native_engine.h
// Add this function to NativeEngine class, we're going to check the gameMode and set the preferred frame rate and resolution cap accordingly
void CheckGameMode();

// CODELAB: native_engine.cpp
void NativeEngine::CheckGameMode() {
  GameModeManager &gameModeManager = GameModeManager::getInstance();
  int game_mode = gameModeManager.GetGameMode();
  if (game_mode != mGameMode) {
    // game mode changed, make necessary adjustments to the game
    // in this sample, we are capping the frame rate and the resolution
    // we're also hardcoding configs on the engine 🫣
    SceneManager *sceneManager = SceneManager::GetInstance();
    NativeEngine *nativeEngine = NativeEngine::GetInstance();
    int native_width = nativeEngine->GetNativeWidth();
    int native_height = nativeEngine->GetNativeHeight();
    int preferred_width;
    int preferred_height;
    int32_t preferredSwapInterval = SWAPPY_SWAP_30FPS;
    if (game_mode == GAME_MODE_STANDARD) {
      // GAME_MODE_STANDARD : fps: 30, res: 1/2
      preferredSwapInterval = SWAPPY_SWAP_30FPS;
      preferred_width = native_width / 2;
      preferred_height = native_height / 2;
    } else if (game_mode == GAME_MODE_PERFORMANCE) {
      // GAME_MODE_PERFORMANCE : fps: 60, res: 1/1
      preferredSwapInterval = SWAPPY_SWAP_60FPS;
      preferred_width = native_width;
      preferred_height = native_height;
    } else if (game_mode == GAME_MODE_BATTERY) {
      // GAME_MODE_BATTERY : fps: 30, res: 1/4
      preferred_height = SWAPPY_SWAP_30FPS;
      preferred_width = native_width / 4;
      preferred_height = native_height / 4;
    } else {  // game_mode == 0 : fps: 30, res: 1/2
      // GAME_MODE_UNSUPPORTED
      preferredSwapInterval = SWAPPY_SWAP_30FPS;
      preferred_width = native_width / 2;
      preferred_height = native_height / 2;
    }
    ALOGI("GameMode SetPreferredSizeAndFPS: %d, %d, %d", preferred_width,
          preferred_height, preferredSwapInterval);
    sceneManager->SetPreferredSize(preferred_width, preferred_height);
    sceneManager->SetPreferredSwapInterval(preferredSwapInterval);
    mGameMode = game_mode;
  }
}

// CODELAB: native_engine.cpp
void NativeEngine::DoFrame() {
  ...

  // here, we are checking on every frame for simplicity
  // but you can hook it to your onResume callback only
  // as gameMode changes will trigger Activity restart
  CheckGameMode();
  SwitchToPreferredDisplaySize();

  ...
}

// CODELAB: app/build.gradle
android {
    compileSdk 33
    ...

    defaultConfig {
        minSdkVersion 30 
        targetSdkVersion 33 // you can use 31 if you're targeting Android 12 and follow the Note section above
        ...
    }

// CODELAB: game_mode_manager.h
enum GAME_STATE_DEFINITION {
    GAME_STATE_UNKNOWN = 0,
    GAME_STATE_NONE = 1,
    GAME_STATE_GAMEPLAY_INTERRUPTIBLE = 2,
    GAME_STATE_GAMEPLAY_UNINTERRUPTIBLE = 3,
    GAME_STATE_CONTENT = 4,
};

// CODELAB: game_mode_manager.h
void SetGameState(bool is_loading, GAME_STATE_DEFINITION game_state);

// CODELAB: game_mode_manager.cpp
void GameModeManager::SetGameState(bool is_loading,
                                   GAME_STATE_DEFINITION game_state) {
  if (android_get_device_api_level() >= 33) {
    ALOGI("GameModeManager::SetGameState: %d => %d", is_loading, game_state);

    JNIEnv* env = NativeEngine::GetInstance()->GetJniEnv();

    jclass cls_gamestate = env->FindClass("android/app/GameState");

    jmethodID ctor_gamestate =
        env->GetMethodID(cls_gamestate, "<init>", "(ZI)V");
    jobject obj_gamestate = env->NewObject(
        cls_gamestate, ctor_gamestate, (jboolean)is_loading, (jint)game_state);

    env->CallVoidMethod(obj_gamemanager_, gamemgr_setgamestate_, obj_gamestate);

    env->DeleteLocalRef(obj_gamestate);
    env->DeleteLocalRef(cls_gamestate);
  }
}

// CODELAB: welcome_scene.cpp
void WelcomeScene::OnInstall() {
  // 1. Game State: Start Loading
  GameModeManager::getInstance().SetGameState(true, GAME_STATE_NONE);
}

// CODELAB: welcome_scene.cpp
void WelcomeScene::OnStartGraphics() {
  // 2. Game State: Finish Loading, showing the attract screen which is interruptible
  GameModeManager::getInstance().SetGameState(
      false, GAME_STATE_GAMEPLAY_INTERRUPTIBLE);
}

// CODELAB: welcome_scene.cpp
void WelcomeScene::OnKillGraphics() {
  // 3. Game State: exiting, cleaning up and preparing to load the next scene
  GameModeManager::getInstance().SetGameState(true, GAME_STATE_NONE);
}

// CODELAB: welcome_scene.cpp
void WelcomeScene::OnUninstall() {
  // 4. Game State: Finished unloading this scene, it will be immediately followed by loading the next scene
  GameModeManager::getInstance().SetGameState(false, GAME_STATE_UNKNOWN);
}

// CODELAB: adpf_manager.cpp
// Initialize JNI calls for the PowerHintManager.
bool ADPFManager::InitializePerformanceHintManager() {
  #if __ANDROID_API__ >= 33
    if ( hint_manager_ == nullptr ) {
        hint_manager_ = APerformanceHint_getManager();
    }
    if ( hint_session_ == nullptr && hint_manager_ != nullptr ) {
        int32_t tid = gettid();
        thread_ids_.push_back(tid);
        int32_t tids[1];
        tids[0] = tid;
        hint_session_ = APerformanceHint_createSession(hint_manager_, tids, 1, last_target_);
    }
    ALOGI("ADPFManager::InitializePerformanceHintManager __ANDROID_API__ 33");
    return true;
#else  
  ALOGI("ADPFManager::InitializePerformanceHintManager __ANDROID_API__ < 33");
  JNIEnv *env = NativeEngine::GetInstance()->GetJniEnv();

  // Retrieve class information
  jclass context = env->FindClass("android/content/Context");

  // Get the value of a constant
  jfieldID fid = env->GetStaticFieldID(context, "PERFORMANCE_HINT_SERVICE",
                                       "Ljava/lang/String;");
  jobject str_svc = env->GetStaticObjectField(context, fid);

  // Get the method 'getSystemService' and call it
  jmethodID mid_getss = env->GetMethodID(
      context, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");
  jobject obj_perfhint_service = env->CallObjectMethod(
      app_->activity->javaGameActivity, mid_getss, str_svc);

  // Add global reference to the power service object.
  obj_perfhint_service_ = env->NewGlobalRef(obj_perfhint_service);

  // Retrieve methods IDs for the APIs.
  jclass cls_perfhint_service = env->GetObjectClass(obj_perfhint_service_);
  create_hint_session_ =
      env->GetMethodID(cls_perfhint_service, "createHintSession",
                       "([IJ)Landroid/os/PerformanceHintManager$Session;");
  jmethodID mid_preferedupdaterate = env->GetMethodID(
      cls_perfhint_service, "getPreferredUpdateRateNanos", "()J");

  // Create int array which contain current tid.
  jintArray array = env->NewIntArray(1);
  int32_t tid = gettid();
  env->SetIntArrayRegion(array, 0, 1, &tid);
  const jlong DEFAULT_TARGET_NS = 16666666;

  // Create Hint session for the thread.
  jobject obj_hintsession = env->CallObjectMethod(
      obj_perfhint_service_, create_hint_session_, array, DEFAULT_TARGET_NS);
  if (obj_hintsession == nullptr) {
    ALOGI("Failed to create a perf hint session.");
  } else {
    obj_perfhint_session_ = env->NewGlobalRef(obj_hintsession);
    preferred_update_rate_ =
        env->CallLongMethod(obj_perfhint_service_, mid_preferedupdaterate);

    // Retrieve mid of Session APIs.
    jclass cls_perfhint_session = env->GetObjectClass(obj_perfhint_session_);
    report_actual_work_duration_ = env->GetMethodID(
        cls_perfhint_session, "reportActualWorkDuration", "(J)V");
    update_target_work_duration_ = env->GetMethodID(
        cls_perfhint_session, "updateTargetWorkDuration", "(J)V");
    set_threads_ = env->GetMethodID(
        cls_perfhint_session, "setThreads", "([I)V");
  }

  // Free local references
  env->DeleteLocalRef(obj_hintsession);
  env->DeleteLocalRef(array);
  env->DeleteLocalRef(cls_perfhint_service);
  env->DeleteLocalRef(obj_perfhint_service);
  env->DeleteLocalRef(str_svc);
  env->DeleteLocalRef(context);

  if (report_actual_work_duration_ == 0 || update_target_work_duration_ == 0) {
    // The API is not supported in the platform version.
    return false;
  }

  return true;
#endif // __ANDROID_API__ >= 33

}

// CODELAB: adpf_manager.cpp
// Invoke the API first to set the android_app instance.
void ADPFManager::SetApplication(android_app *app) {
  ...

  // Initialize PowerHintManager reference.
  InitializePerformanceHintManager();
}

// CODELAB: android_main.cpp
void android_main(struct android_app *app) {
  ...

  // Set android_app to ADPF manager & call InitializePerformanceHintManager
  ADPFManager::getInstance().SetApplication(app);

  ...
}

// CODELAB: adpf_manager.h
// Indicates the start and end of the performance intensive task.
// The methods call performance hint API to tell the performance
// hint to the system.
void BeginPerfHintSession();
void EndPerfHintSession(jlong target_duration_ns);

// CODELAB: adpf_manager.cpp
// Indicates the start and end of the performance intensive task.
// The methods call performance hint API to tell the performance hint to the system.
void ADPFManager::BeginPerfHintSession() { 
  perf_start_ = std::chrono::high_resolution_clock::now(); 
}

void ADPFManager::EndPerfHintSession(jlong target_duration_ns) {
#if __ANDROID_API__ >= 33
    auto perf_end = std::chrono::high_resolution_clock::now();
    auto dur = std::chrono::duration_cast<std::chrono::nanoseconds>(perf_end - perf_start_).count();
    int64_t actual_duration_ns = static_cast<int64_t>(dur);
    APerformanceHint_reportActualWorkDuration(hint_session_, actual_duration_ns);
    APerformanceHint_updateTargetWorkDuration(hint_session_, target_duration_ns);
#else
  if (obj_perfhint_session_) {
    auto perf_end = std::chrono::high_resolution_clock::now();
    auto duration = std::chrono::duration_cast<std::chrono::nanoseconds>(perf_end - perf_start_).count();
    int64_t duration_ns = static_cast<int64_t>(duration);
    JNIEnv *env = NativeEngine::GetInstance()->GetJniEnv();

    // Report and update the target work duration using JNI calls.
    env->CallVoidMethod(obj_perfhint_session_, report_actual_work_duration_,
                        duration_ns);
    env->CallVoidMethod(obj_perfhint_session_, update_target_work_duration_,
                        target_duration_ns);
  }
#endif // __ANDROID_API__ >= 33

  }
}

// CODELAB: demo_scene.cpp
void DemoScene::DoFrame() {
  // Tell ADPF manager beginning of the perf intensive task.
  ADPFManager::getInstance().BeginPerfHintSession();

  ...
  
  // Tell ADPF manager end of the perf intensive tasks.
  ADPFManager::getInstance().EndPerfHintSession(jlong target_duration_ns);
}