Develop Reference

Is it possible to generate an apk in Unity that works differently depending on whether it is Quest 2 or a phone? [duplicate]

How can I set the display to stereoscopic programmatically in Unity for an app deployed to an Android device?
I want a UI menu where the user can toggle between "VR mode" and normal mode. I do not want VR mode by default as it should be an option at run-time. I know there is a setting for "Virtual Reality Supported" in the build settings, but again, I do not want this enabled by default.

Include using UnityEngine.XR; at the top.
Call XRSettings.LoadDeviceByName("") with empty string followed by XRSettings.enabled = false; to disable VR in the start function to disable VR.
When you want to enable it later on, call XRSettings.LoadDeviceByName("daydream") with the VR name followed by XRSettings.enabled = true;.
You should wait for a frame between each function call. That requires this to be done a corutine function.
Also, On some VR devices, you must go to Edit->Project Settings->Player and make sure that Virtual Reality Supported check-box is checked(true) before this will work. Then you can disable it in the Start function and enable it whenever you want.
EDIT:
This is known to work on some VR devices and not all VR devices. Although, it should work on Daydream VR. Complete code sample:
IEnumerator LoadDevice(string newDevice, bool enable)
{
XRSettings.LoadDeviceByName(newDevice);
yield return null;
XRSettings.enabled = enable;
}
void EnableVR()
{
StartCoroutine(LoadDevice("daydream", true));
}
void DisableVR()
{
StartCoroutine(LoadDevice("", false));
}
Call EnableVR() to enable vr and DisableVR() to disable it. If you are using anything other than daydream, pass the name of that VR device to the LoadDevice function in the EnableVR() function.

For newer builds of Unity (e.g. 2019.4.0f1) you can use the XR Plugin Management package.
To enable call:
XRGeneralSettings.Instance.Manager.InitializeLoader();
To disable call:
XRGeneralSettings.Instance.Manager.DeinitializeLoader();

I'm using Unity 2021 but this probably works in earlier versions, I'm also using XR Plug-in Management.
Start:
XRGeneralSettings.Instance.Manager.StartSubsystems();
Stop:
XRGeneralSettings.Instance.Manager.StopSubsystems();
Full documentation at:
https://docs.unity3d.com/Packages/com.unity.xr.management#4.0/manual/EndUser.html

2020.3.14f1
Doesn't work for me, I get this error when running my Android app.
Call to DeinitializeLoader without an initialized manager.Please make
sure wait for initialization to complete before calling this API.
[RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterAssembliesLoaded)]
static void TryToDeinitializeOculusLoader()
{
XRGeneralSettings.Instance.Manager.DeinitializeLoader();
}
More context.
I try to unload the Oculus loader, before he manages to load the plugin.
I have an Android app, and the Oculus loader calls Application.Quit because the device is not an Oculus headset.
Waiting for XRGeneralSettings.Instance.Manager.isInitializationComplete takes too long.
Tried all RuntimeInitializeLoadType annotations.
OculusLoader.cs
#elif (UNITY_ANDROID && !UNITY_EDITOR)
[RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterAssembliesLoaded)]
static void RuntimeLoadOVRPlugin()
{
var supported = IsDeviceSupported();
if (supported == DeviceSupportedResult.ExitApplication)
{
Debug.LogError("\n\nExiting application:\n\nThis .apk was built with the Oculus XR Plugin loader enabled, but is attempting to run on a non-Oculus device.\nTo build for general Android devices, please disable the Oculus XR Plugin before building the Android player.\n\n\n");
Application.Quit();
}
if (supported != DeviceSupportedResult.Supported)
return;
try
{
if (!NativeMethods.LoadOVRPlugin(""))
Debug.LogError("Failed to load libOVRPlugin.so");
}
catch
{
// handle Android standalone build with Oculus XR Plugin installed but disabled in loader list.
}
}
#endif
SOLUTION
Made my build class extend IPreprocessBuildWithReport
public void OnPreprocessBuild(BuildReport report)
{
DisableXRLoaders(report);
}
///https://docs.unity3d.com/Packages/com.unity.xr.management#3.2/manual/EndUser.html
/// Do this as a setup step before you start a build, because the first thing that XR Plug-in Manager does at build time
/// is to serialize the loader list to the build target.
void DisableXRLoaders(BuildReport report)
{
XRGeneralSettingsPerBuildTarget buildTargetSettings;
EditorBuildSettings.TryGetConfigObject(XRGeneralSettings.k_SettingsKey, out buildTargetSettings);
if (buildTargetSettings == null)
{
return;
}
XRGeneralSettings settings = buildTargetSettings.SettingsForBuildTarget(report.summary.platformGroup);
if (settings == null)
{
return;
}
XRManagerSettings loaderManager = settings.AssignedSettings;
if (loaderManager == null)
{
return;
}
var loaders = loaderManager.activeLoaders;
// If there are no loaders present in the current manager instance, then the settings will not be included in the current build.
if (loaders.Count == 0)
{
return;
}
var loadersForRemoval = new List<XRLoader>();
loadersForRemoval.AddRange(loaders);
foreach (var loader in loadersForRemoval)
{
loaderManager.TryRemoveLoader(loader);
}
}

public void Awake() {
StartCoroutine(SwitchToVR(()=>{
Debug.Log("Switched to VR Mode");
}));
//For disable VR Mode
XRSettings.enabled = false;
}
IEnumerator SwitchToVR(Action callback) {
// Device names are lowercase, as returned by `XRSettings.supportedDevices`.
// Google original, makes you specify
// string desiredDevice = "daydream"; // Or "cardboard".
// XRSettings.LoadDeviceByName(desiredDevice);
// this is slightly better;
string[] Devices = new string[] { "daydream", "cardboard" };
XRSettings.LoadDeviceByName(Devices);
// Must wait one frame after calling `XRSettings.LoadDeviceByName()`.
yield return null;
// Now it's ok to enable VR mode.
XRSettings.enabled = true;
callback.Invoke();
}

Xamarin Forms - Take photograph without any user interaction

I have a requirement to take a photograph of a user in Xamarin Forms without them having to press the shutter button. For example, when the app launches it should show a preview and count down from 5 seconds (to give the user chance to get in position) then take a picture automatically.
I have tried the Xamarin Media Plugin library however this stackoverflow post and this GitHub issue state that this feature is not a supported.
I have seen a number of dead discussions such as this with people asking similar questions without resoltion.
I tried the LeadTools AutoCapture sample but this only seems to work for documents/text and not people (unless I am missing something??).
I am now working my way through the Camera2Basic sample which is quite old and only targets Android via android.hardware.camera2.
Are there any samples out there (or 3rd party libraries) that can acheive this requirement? Ideally I would like it to be cross platform (iOS and Android) but currently the main focus is Android.

You can create the Custom View Renderer on Android to achieve that.
And based on this offical sample is more convenient, just modify code as follow can achieve your wants.
This official sample can preview camera view in Xamarin Forms App, we just need to add a Timer to call the Frame from Camera after 5 seconds.The modified Renderer code as follow:
public class CameraPreviewRenderer : ViewRenderer<CustomRenderer.CameraPreview, CustomRenderer.Droid.CameraPreview>, Camera.IPreviewCallback
{
CameraPreview cameraPreview;
byte[] tmpData;
public CameraPreviewRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<CustomRenderer.CameraPreview> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
// Unsubscribe
cameraPreview.Click -= OnCameraPreviewClicked;
}
if (e.NewElement != null)
{
if (Control == null)
{
cameraPreview = new CameraPreview(Context);
SetNativeControl(cameraPreview);
}
Control.Preview = Camera.Open((int)e.NewElement.Camera);
// Subscribe
cameraPreview.Click += OnCameraPreviewClicked;
}
}
protected override void OnAttachedToWindow()
{
base.OnAttachedToWindow();
// call the timer method to get the current frame.
Device.StartTimer(new TimeSpan(0, 0, 5), () =>
{
// do something every 5 seconds
Device.BeginInvokeOnMainThread(() =>
{
Console.WriteLine("get data"+tmpData);
// using MessagingCenter to pass data to forms
MessagingCenter.Send<object, byte[]>(this, "CameraData", tmpData);
cameraPreview.Preview.StopPreview();
cameraPreview.IsPreviewing = false;
// interact with UI elements
});
return false; // runs again, or false to stop
});
}
void OnCameraPreviewClicked(object sender, EventArgs e)
{
if (cameraPreview.IsPreviewing)
{
cameraPreview.Preview.StopPreview();
cameraPreview.IsPreviewing = false;
}
else
{
cameraPreview.Preview.SetPreviewCallback(this);
cameraPreview.Preview.StartPreview();
cameraPreview.IsPreviewing = true;
}
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
Control.Preview.Release();
}
base.Dispose(disposing);
}
// get frame all the time
public void OnPreviewFrame(byte[] data, Camera camera)
{
tmpData = data;
}
}
Now, Xamarin Forms can receive the data from MessagingCenter:
MessagingCenter.Subscribe<object, byte[]>(this, "CameraData", async (sender, arg) =>
{
MemoryStream stream = new MemoryStream(arg);
if (stream != null)
{
//image is defined in Xaml
image.Source = ImageSource.FromStream(() => stream);
}
});
image is defined in XAML: <Image x:Name="image" WidthRequest="200" HeightRequest="200"/>

Facebook Unity SDK on Android crashes when fb.init is called

I'm working facebook unity SDK, everything is fine on unity editor, but doesn't work on android device. "App stopped" when fb.init called.
I use unity 5.5.1 version and facebook sdk version is 7.9.4
here is code :
public void teststr()
{
if (!FB.IsInitialized) {
// Initialize the Facebook SDK
FB.Init(InitCallback, OnHideUnity);
} else {
// Already initialized, signal an app activation App Event
}
}
private void InitCallback ()
{
if (FB.IsInitialized) {
// ...
} else {
}
}
private void OnHideUnity (bool isGameShown)
{
if (!isGameShown) {
// Pause the game - we will need to hide
Time.timeScale = 0;
} else {
// Resume the game - we're getting focus again
Time.timeScale = 1;
}
}
teststr function fires when I clicked button

I've solved!
I use FB.Init(this.InitCallback, this.OnHideUnity);
instead of FB.Init(InitCallback, OnHideUnity);

Revmob fullscreen ad preload on Unity?

Is there any way to preload fullscreen ad on Unity? Right now when we call it using
revmob.ShowFullscreen();
when we create end game screen. But most of the time it loads after 5/10 secs later which is in-game most probably if you press restart, so it shows a full screen ad during gameplay.
I've found some ways to preload it on native android and tried same function to see if they exists in Unity but no luck.
Thanks.

Yes! You can use the following code:
private RevMobFullscreen fullscreen;
fullscreen = revmob.CreateFullscreen();
fullscreen.show();
If you need more information, you can access RevMob mobile ad network website: https://www.revmobmobileadnetwork.com

It will be better to add this code to the Create statement:
private RevMobFullscreen fullscreen;
fullscreen = revmob.CreateFullscreen();
...and then also this code to the listener:
RevMobAdsListener revmobListener = new RevMobAdsListener() {
// Required
#Override
public void onRevMobSessionIsStarted() {
fullscreen.show();
}
(...)
}
This will show the fullscreen ad.

You can do like this to preload revmob videos in unity. But there are memory leaks in revmob unity videos and they might fix that in 9.2.x...
REVMOB_APP_IDS = new Dictionary<string, string>() {
{ "Android", androidMediaId},
{ "IOS", iosMediaId }
};
revmob = RevMob.Start (REVMOB_APP_IDS, gameObject.name);
public void SessionIsStarted ()
{
CacheVideoInterstitial("Bootup");
}
public void CacheVideoInterstitial(string location) {
DestroyVideo();
StartCoroutine(CacheAfterEndofFrame(location));
}
IEnumerator CacheAfterEndofFrame(string location) {
yield return null;
fullscreenVideo = revmob.CreateVideo(location);
}
void DestroyVideo() {
if( fullscreenVideo != null ) {
fullscreenVideo.Hide();
//fullscreenVideo.Release();
//fullscreenVideo = null;
}
}
// revmob ad closing delegate
public void UserClosedTheAd (string revMobAdType)
{
DestroyVideo();
CacheVideoInterstitial(this.location);
}

pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY) not giving corerct answer

I want to check if a device has any cameras before trying to open a qr code reader.
I have the following code:
public boolean checkDeviceCompatibility() {
PackageManager pm = context.getPackageManager();
if (pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY)) {
if (pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
return true;
} else {
// use front camera
Toast.makeText(
context,
"This device does not have a back camera so it has automatically reverted to the front camera",
Toast.LENGTH_SHORT).show();
return true;
}
} else {
util.displayErrorDialog(
context,
"This device does not have any cameras and therefore cannot make use of the QR Code feature.");
return false;
}
}
But now if I run this code in debug mode on my galaxy S3 with two cameras. the first if statement is returned false.
Why could this be?

FEATURE_CAMERA_ANY was added in Android 4.2. hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY) should return false for any pre-4.2 device. If your S3 is still on 4.1, that would explain your problem.

To make it clear.
FEATURE_CAMERA_ANY was added to Android 4.2 ( API-17): Android - developers.
code:
public static boolean hasCamera(Context context) {
return context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY);
}
Note that using this code will return false if device under version 4.2:
Then you should know that there is a bug with emulator when use FEATURE_CAMERA_ANY feature (with android 4.2 and above). see: Emulator does not honour Camera support flag
Thats why Im still using old way even its deprecated:
public static boolean hasCamera() {
return android.hardware.Camera.getNumberOfCameras() > 0;
}