Develop Reference

Unity Raycast results different on two devices

I use the following codes to detect which UI element is the player pointing. It works well in Unity Editor, on one of my Android phone, but failed on a second Android phone.
public static T RaycastOnFirstPointed<T>(EventSystem eventSystem, GraphicRaycaster raycaster)
{
if (Application.platform == RuntimePlatform.Android || Application.platform == RuntimePlatform.IPhonePlayer)
{
if (Input.touches == null || Input.touches.Length == 0) return default;
}
var m_PointerEventData = new PointerEventData(eventSystem);
m_PointerEventData.position = Input.mousePosition;
var results = new List<RaycastResult>();
raycaster.Raycast(m_PointerEventData, results); // On the 2nd phone the results.length is 0
foreach (RaycastResult result in results)
{
var component = result.gameObject.GetComponent<T>();
if (component != null)
{
return component;
}
}
return default;
}
This method is called within a IEndDragHandler.OnEndDrag method. I tried to debug it on the 2nd Android phone, and saw the results.length is 0 after Raycast was executed.(it should be > 0 since I ended my drag on several overlapped UI elements, and it is > 0 on the 1st phone, not sure why the 2nd phone is different)
I don't have any clue where should I go from here to find the problem. Please show me some directions, thank you!
More info:
Phone 1: MI 8 Lite, OS: MIUI 10.3
Phone 2: MI 9, OS: MIUI 10.2.35
============Update===========
Reason found:
When IEndDragHandler.OnEndDrag is triggered, the Input.mousePosition has different value on the two devices. 1st Phone has the touch position from the last frame, while the 2nd phone seems clears that value, and it has a very large wrong value. I'm working on how to solve this in a proper way. Any suggestions are welcomed.

Problem solved. As I updated in the question, this problem is caused by wrong Input.mousePosition value on different devices. So I updated the RaycastOnFirstPointed method as follows:
public static T RaycastOnFirstPointed<T>(EventSystem eventSystem, GraphicRaycaster raycaster, PointerEventData eventData = null)
{
if (Application.platform == RuntimePlatform.Android || Application.platform == RuntimePlatform.IPhonePlayer)
{
if (Input.touches == null || Input.touches.Length == 0) return default;
}
var m_PointerEventData = new PointerEventData(eventSystem);
if (eventData == null)
{
m_PointerEventData.position = Input.mousePosition;
}
else
{
m_PointerEventData.position = eventData.position;
}
var results = new List<RaycastResult>();
raycaster.Raycast(m_PointerEventData, results);
foreach (RaycastResult result in results)
{
var component = result.gameObject.GetComponent<T>();
if (component != null)
{
return component;
}
}
return default;
}
When call this method within OnEndDrag, pass in the PointerEventData that unity provides and use its position.

Not able to update Picker.SelectedIndex

I have an odd issue I can't explain the reason for it - maybe someone here can shed some light on it
I have a ticket scanning app in Xamarin Forms currently testing it on android
the interface allows you to:
type an order number and click the check order Button
use the camera scanner to scan which automatically triggers check order
use the barcode scanner to scan which automatically triggers check order
after the check order validation, user has to select the number of tickets from a drop down list and press confrim entry button
what I'm trying to do, is if the seats available on that ticket is just 1 - then automatically trigger confirm entry button functionality
problem that I have is that - some of my logic depends on setting the drop down index in code - for some reason it doesn't update - as seen in the debugger shot here
and this is the second tme I've noticed this today, earlier it was a var I was trying to assign a string and it kept coming up as null - eventually I replaced that code
is this a bug in xamarin ?
code has been simplified:
async void OnCheckOrderButtonClicked(object sender, EventArgs e)
{
await ValidateOrderEntry();
}
private async void scanCameraButton_Clicked(object sender, EventArgs e)
{
messageLabel.Text = string.Empty;
var options = new ZXing.Mobile.MobileBarcodeScanningOptions();
options.PossibleFormats = new List<ZXing.BarcodeFormat>() {
ZXing.BarcodeFormat.QR_CODE,ZXing.BarcodeFormat.EAN_8, ZXing.BarcodeFormat.EAN_13
};
var scanPage = new ZXingScannerPage(options);
scanPage.OnScanResult += (result) =>
{
//stop scan
scanPage.IsScanning = false;
Device.BeginInvokeOnMainThread(async () =>
{
//pop the page and get the result
await Navigation.PopAsync();
orderNoEntry.Text = result.Text;
//automatically trigger update
await ValidateOrderEntry();
});
};
await Navigation.PushAsync(scanPage);
}
private async Task ValidateOrderEntry()
{
//...other code....
checkInPicker.Items.Clear();
if (availablTickets == 1)
{
checkInPickerStack.IsVisible = true;
checkInPicker.SelectedIndex = 0;
messageLabel.Text = "Ticket OK! - " + orderNoEntry.Text;
messageLabel.TextColor = Color.Green;
//select the only element
checkInPicker.SelectedIndex = 0;
await PostDoorEntry();
}
//...other code....
}
private async Task PostDoorEntry()
{
int entryCount = checkInPicker.SelectedIndex + 1;
//... more code...
//...post api code..
}

Maybe I'm overlooking something, but you clear all the items a few lines above the one you are pointing out. That means there are no items in your Picker and thus you can't set the SelectedIndex to anything other than -1, simply because there are no items.

AS3/AIR Save/Load multiple usernames using SharedObject

I am trying to create an Android application created using Adobe Flash Actionscript 3. I wanted each user of the app to input their name in the beginning of the application, then they have the capability to save their progress in current frame (and it will be saved into a save slot or similar). However, the problem arises when another user is going to use the app, he/she must enter a distinct username, and he/she can save anytime (and load his/her distinct load progress, different from the previous user.). And it goes on.
I am a newbie in programming and I hope you could help me. Any suggestions will be appreciated. Thanks!
This my code for creating a username and saving it:
function handleClick(Event:MouseEvent):void
{
var myFirstVariable = boxOne.text;
boxTwo.text = myFirstVariable;
gotoAndStop("opening_scene")
}
myButton2.addEventListener(MouseEvent.MOUSE_UP, handleClick);
UPDATED EDIT 2: Here is my code for saving and loading. Still not working:
var so:SharedObject = SharedObject.getLocal("Test");
var userName:String = nameField.text;
if (so.data.users == null)
so.data.users = new Object();
btnSave.addEventListener(MouseEvent.CLICK, onClick);
function onClick(e:MouseEvent):void
{
if (so.data.users[userName] == null)
so.data.users[userName] = new Object();
so.data.users[userName].lastframe = currentFrame;
so.flush();
trace(userName);
}
btnLoad.addEventListener(MouseEvent.CLICK, reloadBtnClick);
function reloadBtnClick(e:MouseEvent):void
{
if (so.data.users[userName] == null)return;
if (so.data.users[userName].lastFrame == null) return;
gotoAndStop(so.data.users[userName].lastFrame);
trace(userName);
}

I recommend that you use a SQLite Data Base to save your data can find all the documentation here Manipulating SQL database data Well is a little bit more complicate but works like have tables in Excel.

As Vesper suggested, you need to have a storage with all the users you store. For example:
// Put user name here.
var userName:String;
var SO:SharedObject = SharedObject.getLocal("save");
// Create storage for users.
if (SO.data.users == null) SO.data.users = new Object();
// ...
function saveCurrentFrame(event:MouseEvent):void
{
// Create storage for current user by their name.
if (SO.data.users[userName] == null) SO.data.users[userName] = new Object();
SO.data.users[userName].lastframe = currentFrame;
SO.flush();
}
function getLastFrame(event:MouseEvent):void
{
trace(1);
// Skip this if there's no record for
if (SO.data.users[userName] == null) return;
trace(2);
if (SO.data.users[userName].lastFrame == null) return;
trace(3);
gotoAndStop(SO.data.users[userName].lastFrame);
trace(4);
}

Social.localuser.image is always returning null

I am using Unity along with the Google Play Services Plugin for Unity found over here: https://github.com/playgameservices/play-games-plugin-for-unity
I am trying to access the players avatar to be included in a profile pic ingame. The problem is when I try accessing the Texture2D Social.localuser.image, it always returns null. Upon more research it seems that the code uses some kind of AvatarURL to find the image and that is the thing that is null. I used string.IsNullOrEmpty(AvatarURL) to check this. Does anyone know why AvatarURL is null, and/or how I can fix it. If not that, is there any alternative way to accessing the players avatar to use for a profile picture in my game.
Here is the code I used to test this:
PlayGamesPlatform.Activate();
//Authenticate User
Social.localUser.Authenticate((bool success) => {
if(success) {
Debug.Log("Successfully Authenticated");
Textures.profilePic = Sprite.Create(Social.localUser.image, new Rect(0, 0, Social.localUser.image.width, Social.localUser.image.height), new Vector2(0.5f, 0.5f));
SceneManager.LoadScene("Main Menu");
} else {
Debug.Log("Failed to Authenticate User");
SceneManager.LoadScene("ErrorCanNotSignIn");
}
});
The error happens when setting Textures.profilePic (Textures is another class I created that stores textures, and profilePic is a static Sprite variable in it). It says there is a NullReferenceException: Object reference not set to an instance of the object.
Again based on what I've seen, I think the source of the error seems to be the AvatarURL being null, as it causes this code, which I am pretty sure is what loads the image, not to run:
if (!mImageLoading && mImage == null && !string.IsNullOrEmpty(AvatarURL))
{
Debug.Log("Starting to load image: " + AvatarURL);
mImageLoading = true;
PlayGamesHelperObject.RunCoroutine(LoadImage());
}
Also if it's important, I am testing this on an android device.

Question answered by JeanLuc on this SO question
The implementation for Social.localUser.image of the Play Games Unity
Plugin returns always null.

The reason why the image returns null is because it's loaded asynchronously, so you'll need to wait for it.
Furthermore there's a bug where you first need to access Social.localUser.userName.
This code should be working:
Debug.Log(Social.localUser.userName); // you need to access Social.localUser.userName, otherwise the image will always return null
StartCoroutine(KeepCheckingAvatar());
// ...
private IEnumerator KeepCheckingAvatar()
{
float secondsOfTrying = 20;
float secondsPerAttempt = 0.2f;
while (secondsOfTrying > 0)
{
if (Social.localUser.image != null)
{
// Do something with freshly loaded image
break;
}
secondsOfTrying -= secondsPerAttempt;
yield return new WaitForSeconds(secondsPerAttempt);
}
}
Credits:
https://github.com/playgameservices/play-games-plugin-for-unity/issues/1056#issuecomment-212257972

iscroll is not working properly for dynamic form in phonegap

I have developed android phonegap app.I have a appended the dynamic form contains 'input' and 'select' in the div.I need to get scrollbar for that div.So i used iScroll.js but its not working properly.While typing in the textbox suddenly scrollbar disappears.This problem occurring often.
Here is my code:
function loaded()
{
var myScroll = new iScroll('wrapper',
{
scrollbarClass: 'myScrollbar',
useTransform: false,
vScroll: true,
onBeforeScrollStart: function (e)
{
var target = e.target;
while (target.nodeType != 1) target = target.parentNode;
if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA')
e.preventDefault();
}
});
}
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', loaded, false);
Please kindly guide me.Thanks in Advance

so a couple of things that will be helpful -
define your myScroll variable outside of your loaded function that way you can access it anywhere.
also after your content has loaded call myScroll.refresh() and have at least a 1ms delay on it. little hack that goes a long way.