在 Android 中設定 ARCore 工作階段

設定 ARCore 工作階段，為應用程式打造 AR 體驗。

什麼是工作階段？

所有 AR 程序 (例如動作追蹤、環境理解和亮度評估) 都會在 ARCore 工作階段內進行。Session 是 ARCore API 的主要進入點。其會管理 AR 系統狀態並處理工作階段生命週期，允許應用程式建立、設定、啟動或停止工作階段。最重要的是，讓應用程式能夠接收用來存取相機圖片和裝置姿勢的影格。

這個工作階段可用於設定下列功能：

確認 ARCore 已安裝且為最新版本

建立 Session 之前，請確認 ARCore 已安裝且為最新版本。如果未安裝 ARCore，工作階段建立就會失敗，後續的安裝或升級 ARCore 則需要重新啟動應用程式。

Java

// Verify that ARCore is installed and using the current version.
private boolean isARCoreSupportedAndUpToDate() {
  ArCoreApk.Availability availability = ArCoreApk.getInstance().checkAvailability(this);
  switch (availability) {
    case SUPPORTED_INSTALLED:
      return true;

    case SUPPORTED_APK_TOO_OLD:
    case SUPPORTED_NOT_INSTALLED:
      try {
        // Request ARCore installation or update if needed.
        ArCoreApk.InstallStatus installStatus = ArCoreApk.getInstance().requestInstall(this, true);
        switch (installStatus) {
          case INSTALL_REQUESTED:
            Log.i(TAG, "ARCore installation requested.");
            return false;
          case INSTALLED:
            return true;
        }
      } catch (UnavailableException e) {
        Log.e(TAG, "ARCore not installed", e);
      }
      return false;

    case UNSUPPORTED_DEVICE_NOT_CAPABLE:
      // This device is not supported for AR.
      return false;

    case UNKNOWN_CHECKING:
      // ARCore is checking the availability with a remote query.
      // This function should be called again after waiting 200 ms to determine the query result.
    case UNKNOWN_ERROR:
    case UNKNOWN_TIMED_OUT:
      // There was an error checking for AR availability. This may be due to the device being offline.
      // Handle the error appropriately.
  }
}

Kotlin

// Verify that ARCore is installed and using the current version.
fun isARCoreSupportedAndUpToDate(): Boolean {
  return when (ArCoreApk.getInstance().checkAvailability(this)) {
    Availability.SUPPORTED_INSTALLED -> true
    Availability.SUPPORTED_APK_TOO_OLD, Availability.SUPPORTED_NOT_INSTALLED -> {
      try {
        // Request ARCore installation or update if needed.
        when (ArCoreApk.getInstance().requestInstall(this, true)) {
          InstallStatus.INSTALL_REQUESTED -> {
            Log.i(TAG, "ARCore installation requested.")
            false
          }
          InstallStatus.INSTALLED -> true
        }
      } catch (e: UnavailableException) {
        Log.e(TAG, "ARCore not installed", e)
        false
      }
    }

    Availability.UNSUPPORTED_DEVICE_NOT_CAPABLE ->
      // This device is not supported for AR.
      false

    Availability.UNKNOWN_CHECKING -> {
      // ARCore is checking the availability with a remote query.
      // This function should be called again after waiting 200 ms to determine the query result.
    }
    Availability.UNKNOWN_ERROR, Availability.UNKNOWN_TIMED_OUT -> {
      // There was an error checking for AR availability. This may be due to the device being offline.
      // Handle the error appropriately.
    }
  }
}

建立工作階段

在 ARCore 中建立並設定工作階段。

Java

public void createSession() {
  // Create a new ARCore session.
  session = new Session(this);

  // Create a session config.
  Config config = new Config(session);

  // Do feature-specific operations here, such as enabling depth or turning on
  // support for Augmented Faces.

  // Configure the session.
  session.configure(config);
}

Kotlin

fun createSession() {
  // Create a new ARCore session.
  session = Session(this)

  // Create a session config.
  val config = Config(session)

  // Do feature-specific operations here, such as enabling depth or turning on
  // support for Augmented Faces.

  // Configure the session.
  session.configure(config)
}

關閉工作階段

Session 擁有大量的原生堆積記憶體。如未明確關閉工作階段，可能會導致應用程式因原生記憶體不足並異常終止。不再需要 AR 工作階段時，請呼叫 close() 來釋出資源。如果您的應用程式包含單一啟用 AR 的活動，請從活動的 onDestroy() 方法呼叫 close()。

Java

// Release native heap memory used by an ARCore session.
session.close();

Kotlin

// Release native heap memory used by an ARCore session.
session.close()

後續步驟