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.

Get touch Location and tap on monogame

I'm writing a game in monogame for Android for my school project but I can't get touch location to do one simple tap action, I search but I can't find anything useful to do that. My game is a pipe puzzle game that I want when player touch a pipe it rotate but as I say I can't do this. this is my code for keyboard input.
KeyboardState newState = Keyboard.GetState();
if (oldState.IsKeyUp(Keys.Space) && newState.IsKeyDown(Keys.Space))
{
angle1 += (float)Math.PI / 2.0f;
}
oldState = newState;

You'll want to add a check for the following:
TouchCollection touchCollection = TouchPanel.GetState();
if (touchCollection.Count > 0)
{
//Only Fire Select Once it's been released
if (touchCollection[0].State == TouchLocationState.Moved || touchCollection[0].State == TouchLocationState.Pressed)
{
Console.WriteLine(touchCollection[0].Position);
{
}
You can then do what ever you want with the Position variable.

Prevent special characters in android browsers by JQuery

My issue is very clear and I will go direct to the point.
I have registration form and the user is not allowed to type some characters as (Arabic letter and special characters), So I used JQuery to do that and it worked fine in windows browsers and in iOS browsers but I faced a problem in Android browsers, Here is my code :
$("#NonArabic").keypress(function(event) {
var ew = event.keyCode || event.which;
if (1 <= ew && ew <= 126 && ew != 38)
return true;
return false;
});
$("[name='NationalID']").keypress(function(event) {
var ew = event.which;
if (48 <= ew && ew <= 57 || ew <= 32)
return true;
return false;
});
$("[name='FullName']").keypress(function(event) {
var ew = event.which;
if (47 >= ew || ew >= 58)
return true;
return false;
});
"NoneArabic" is the ID of the form and the others are input fields, the wired thing is that the "NationalID" input field only accepts numbers as you can see the validation and it works fine in all environments (including android browsers), but the "FullName" input field supposed to accept letters only, Although I'm using the same validation way but it's not working in android browsers.
Note: I'm using JSP and Jquery.
So does anyone ever dealt with something like that or know where I went wrong !!
I hope that it's clear and thanks in advance.

App works on PC but not in Android

I created an app using Unity3D. After developing it for some weeks I tried to generate an apk and test it on my SGII.
Unity returns no errors or warnings when testing the app locally, but when it runs on my phone, it doesn't work.
There are 2 buttons (1 to clock in and 1 to clock out from work). Button 1 takes the date when you clock in, and switches a boolean to allow you to clock out. When running in my phone, button 1 works fine but button 2 doesn't. The button works actually, since it returns every debug.log, but nothing else.
My code looks like this:
function OnGUI()
{
GUI.skin = skin;
if(Functions.firstTime == 0)
{
Functions.setupWiz();
}
switch(currentMenu)
{
case 1:
GUI.BeginGroup(Rect(0, 0, width, height));
if(Functions.birthday == true)
{
debugLog11 = "\n"+happyBirthdayMsg+", "+Functions.userName+"!";
Functions.birthday = false;
}
if(GUI.Button(Rect(buttonTopHMargin,height*.1f + buttonTopVMargin, width*.24f, height*.1f), "ENTRADA", "Box"))
{
if(!clockedIn && clockedOut)
{
var clockIn = Functions.clockIn();
debugLog11 = "\nHora de entrada";
debugLog12 = "\n"+clockIn[3]+":"+clockIn[4]+":"+clockIn[5];
clockedIn = true;
clockedOut = false;
}
else
{
debugLog11 = "\n"+errorMsg1;
debugLog12 = "\n";
}
}
if(GUI.Button(Rect(width - buttonTopHMargin - width*.24f, height*.1f + buttonTopVMargin, width*.24f, height*.1f), "SALIDA", "Box"))
{
if(!clockedOut && clockedIn)
{
// debugLog11 = clockedIn+"\n"+clockedOut;
Functions.clockOut();
var clockOut = Functions.clockOut();
var workedSecondsToday : Array = Functions.calculateDay();
var workedTimeToday = Functions.convertSeconds(parseInt(workedSecondsToday[0].ToString()));
var extraTimeToday = Functions.convertSeconds(parseInt(workedSecondsToday[1].ToString()));
var festTimeToday = Functions.convertSeconds(parseInt(workedSecondsToday[2].ToString()));
if(parseInt(workedSecondsToday[0].ToString()) > 0 && parseInt(workedSecondsToday[1].ToString()) < 1 && parseInt(workedSecondsToday[2].ToString()) < 1)
{
debugLog11 = "\nHora de Salida\nNormal:"; //NORMAL
debugLog12 = "\n"+clockOut[3]+":"+clockOut[4]+":"+clockOut[5]+"\n"+workedTimeToday[1]+":"+workedTimeToday[2]+workedTimeToday[3];
}
else if(parseInt(workedSecondsToday[0].ToString()) > 0 && parseInt(workedSecondsToday[1].ToString()) > 0 && parseInt(workedSecondsToday[2].ToString()) < 1)
{
debugLog11 = "\nHora de Salida\nNormal:\nExtra:"; //NORMAL + EXTRA
debugLog12 = "\n"+clockOut[3]+":"+clockOut[4]+":"+clockOut[5]+"\n"+workedTimeToday[1]+":"+workedTimeToday[2]+workedTimeToday[3]+"\n"+extraTimeToday[0]+"-"+extraTimeToday[1]+":"+extraTimeToday[2]+":"+extraTimeToday[3];;
}
else if(parseInt(workedSecondsToday[0].ToString()) > 0 && parseInt(workedSecondsToday[1].ToString()) < 1 && parseInt(workedSecondsToday[2].ToString()) > 0)
{
debugLog11 = "\nHora de Salida\nNormal:\nFestivo:"; //NORMAL + FESTIVO
debugLog12 = "\n"+clockOut[3]+":"+clockOut[4]+":"+clockOut[5]+"\n"+workedTimeToday[1]+":"+workedTimeToday[2]+workedTimeToday[3]+"\n"+festTimeToday[0]+"-"+festTimeToday[1]+":"+festTimeToday[2]+":"+festTimeToday[3];
}
else if(parseInt(workedSecondsToday[0].ToString()) > 0 && parseInt(workedSecondsToday[1].ToString()) > 0 && parseInt(workedSecondsToday[2].ToString()) > 0)
{
debugLog11 = "\nHora de Salida\nNormal:\nExtra:\nFestivo:"; //NORMAL + EXTRA + FESTIVO
debugLog12 = "\n"+clockOut[3]+":"+clockOut[4]+":"+clockOut[5]+"\n"+workedTimeToday[1]+":"+workedTimeToday[2]+workedTimeToday[3]+"\n"+extraTimeToday[0]+"-"+extraTimeToday[1]+":"+extraTimeToday[2]+":"+extraTimeToday[3]+"\n"+festTimeToday[0]+"-"+festTimeToday[1]+":"+festTimeToday[2]+":"+festTimeToday[3];
}
clockedOut = true;
clockedIn = false;
}
else
{
debugLog01 = mainMsg;
debugLog11 = "\n"+errorMsg2;
debugLog12 = "\n";
}
}
Can't explain myself better since I have no clue about what is happening. Any help will be much appreciated.

Yesterday, i started placing tons of labels everywhere in my code and finally discovered where it stopped.
It was just replacing this...
var sw = new StreamWriter(Application.persistentDataPath+"\\Settings.txt", false);
by...
var sw = new StreamWriter(Application.persistentDataPath+"/Settings.txt", false);
Only windows supports this bar "\" when used for setting paths, but i was thinking all the time that the error was somewhere in the OnGUI function.
Thanks lot to everyone who came helping me :)

On the Unity3D you can find this information:
Work with specific constraints (constraint):
Samsung Galaxy S (30 MB limit to downloadable file size, also problems with UI)
Samsung Galaxy Tab (30 MB limit to downloadable file size)
HTC Desire (40 MB limit to downloadable file size)
Samsung Galaxy S2 (Minor but possibly annoying issue: phone may work in 16-bit mode with Unity and show color banding Edit: a workaround was added to address the GS2 graphics driver, I don't know if it was related to this problem or not)
HTC EVO3D (Must build with Unity 3.4)
HTC Sensation (Must build with Unity 3.4)
Samsung Galaxy S2 (Minor but possibly annoying issue: phone may work in 16-bit mode with Unity and show color banding Edit: a workaround was added to address the GS2 graphics driver, I don't know if it was related to this problem or not)
Unity3D Android Limitations

Can't attach child process in release build (Android)

I try to fork and then trace my child by calling ptrace(PTRACE_ATTACH, iChildPid, 0, 0) on Android:
- and get success when working with a debug build
- and get failure with a release build (Operation not permitted (1))
Where I'm wrong?

Okay :(
This is an Android feature. If the application is not marked as debuggable (manifest: android:debuggable = false), PTRACE_ATTACH does not works in both directions (parent2child and child2parent). Only root can do this.

According to the source of Android framework, you indeed can enable ptrace-able by yourself in app release build. (Just dont forget to call this function before your fork child process and ptrace parent)
frameworks/base/core/jni/com_android_internal_os_Zygote.cpp
static void EnableDebugger() {
// To let a non-privileged gdbserver attach to this
// process, we must set our dumpable flag.
if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) {
ALOGE("prctl(PR_SET_DUMPABLE) failed");
}
// A non-privileged native debugger should be able to attach to the debuggable app, even if Yama
// is enabled (see kernel/Documentation/security/Yama.txt).
if (prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0) == -1) {
// if Yama is off prctl(PR_SET_PTRACER) returns EINVAL - don't log in this
// case since it's expected behaviour.
if (errno != EINVAL) {
ALOGE("prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY) failed");
}
}
// Set the core dump size to zero unless wanted (see also coredump_setup in build/envsetup.sh).
if (!GetBoolProperty("persist.zygote.core_dump", false)) {
// Set the soft limit on core dump size to 0 without changing the hard limit.
rlimit rl;
if (getrlimit(RLIMIT_CORE, &rl) == -1) {
ALOGE("getrlimit(RLIMIT_CORE) failed");
} else {
rl.rlim_cur = 0;
if (setrlimit(RLIMIT_CORE, &rl) == -1) {
ALOGE("setrlimit(RLIMIT_CORE) failed");
}
}
}
}