配置 ARCore 会话,为您的应用打造 AR 体验。
什么是会话?
所有 AR 进程(例如动作跟踪、环境理解和光照估测)都发生在 ARCore 会话内。Session
是 ARCore API 的主入口点。它管理 AR 系统状态并处理会话生命周期,允许应用创建、配置、启动或停止会话。最重要的是,它使应用能够接收允许访问相机图片和设备姿势的帧。
会话可用于配置以下功能:
验证 ARCore 是否已安装且是最新版本
在创建 Session
之前,请验证 ARCore 是否已安装且是最新版本。如果未安装 ARCore,则会话创建失败,后续任何 ARCore 安装或升级都需要重启应用。
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.
}
}
}
创建会话
在 ARCore 中创建和配置会话。
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)
}
关闭会话
Session
拥有大量原生堆内存。未能显式关闭会话可能会导致应用耗尽原生内存并崩溃。当不再需要 AR 会话时,请调用 close()
以释放资源。如果您的应用包含一个支持 AR 的 activity,请从该 activity 的 onDestroy()
方法调用 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()