I'm looking for a ListView that can support multiple columns (currently using FlowListView) but I also want to have a different column count mid collection.
The use case is really simple, and is based on the images-page from Google: a list with multiple columns is visible and by tapping an item, a new row right below it wil open up but using only one column (ColumnSpan or Expand).
For instance:
Is this possible using FlowListView, or any other control?
I have an application published on Google Play built using Xamarin Forms. I use the MS App Center to monitor crashes and daily I receive crash information from code unrelated to my application. How us must handle this cases?
Is there any way to better investigate these cases? Should I register a bug for each of them?
Ex1:
java.lang.OutOfMemoryError: Failed to allocate a 20 byte allocation with 0 free bytes and 3GB until OOM
at kh.a(com.google.android.gms.DynamiteModulesB@12221238@12.2.21 (238-188803320):95)
at kh.b(com.google.android.gms.DynamiteModulesB@12221238@12.2.21 (238-188803320):90)
at com.google.maps.api.android.lib6.impl.fn.a(com.google.android.gms.DynamiteModulesB@12221238@12.2.21 (238-188803320):11)
at com.google.maps.api.android.lib6.impl.fp.run(com.google.android.gms.DynamiteModulesB@12221238@12.2.21 (238-188803320):23)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Ex2:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.higgx.studying/md5f86dd3651b84190e5d2506587b29c5c3.MainActivity}: java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.AbsListView$SavedState
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2706)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)
at android.app.ActivityThread.-wrap12(ActivityThread.java:-1)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1514)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6205)
at java.lang.reflect.Method.invoke(Method.java:-2)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
....
Ex3:
Xamarin Exception Stack:
System.NotSupportedException: Unable to activate instance of type Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer from native handle 0xffc1382c (key_handle 0x3d153b).
at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x0017d] in :0
at Java.Lang.Object.GetObject (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type type) [0x000b9] in :0
at Java.Lang.Object._GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00017] in :0
at Java.Lang.Object.GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00000] in :0
at Java.Lang.Object.GetObject[T] (System.IntPtr jnienv, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00006] in :0
at Android.Views.View.n_Invalidate (System.IntPtr jnienv, System.IntPtr native__this) [0x00000] in :0
at (wrapper dynamic-method) System.Object:a8fd650e-905c-49b3-9edc-1805d8c4a198 (intptr,intptr)
--- End of inner exception stack trace ---
...
Ex4:
java.util.concurrent.TimeoutException: android.view.ThreadedRenderer.finalize() timed out after 10 seconds
at android.view.ThreadedRenderer.nDeleteProxy(ThreadedRenderer.java:-2)
at android.view.ThreadedRenderer.finalize(ThreadedRenderer.java:896)
at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:222)
at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:209)
at java.lang.Thread.run(Thread.java:761)
Ex5:
Xamarin Exception Stack:
Java.Lang.Error: OutOfMemoryError thrown while trying to throw OutOfMemoryError; no stack trace available
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
at Java.Interop.JniEnvironment+StaticMethods.CallStaticObjectMethod (Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <26daccb04dc641819234102c21fb48e0>:0
at Java.Interop.JniPeerMembers+JniStaticMethods.InvokeObjectMethod (System.String encodedMember, Java.Interop.JniArgumentValue* parameters) [0x00018] in <26daccb04dc641819234102c21fb48e0>:0
at Android.Graphics.BitmapFactory.DecodeResource (Android.Content.Res.Resources res, System.Int32 id) [0x00044] in :0
at Android.Graphics.BitmapFactory+<>c__DisplayClass25_0.b__0 () [0x00000] in :0
at System.Threading.Tasks.Task1[TResult].InnerInvoke () [0x0000f] in <d361b61194ad4e55becd53788466b04c>:0 at System.Threading.Tasks.Task.Execute () [0x00010] in <d361b61194ad4e55becd53788466b04c>:0 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <d361b61194ad4e55becd53788466b04c>:0 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in <d361b61194ad4e55becd53788466b04c>:0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <d361b61194ad4e55becd53788466b04c>:0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <d361b61194ad4e55becd53788466b04c>:0 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in :0
at Xamarin.Forms.Platform.Android.FileImageSourceHandler+d__4.MoveNext () [0x00144] in <173f39d71f0d4d928f5bbea42e96ffa8>:0
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
at Java.Interop.JniEnvironment+StaticMethods.CallStaticObjectMethod (Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <26daccb04dc641819234102c21fb48e0>:0
at Java.Interop.JniPeerMembers+JniStaticMethods.InvokeObjectMethod (System.String encodedMember, Java.Interop.JniArgumentValue* parameters) [0x00018] in <26daccb04dc641819234102c21fb48e0>:0
at Android.Graphics.BitmapFactory.DecodeResource (Android.Content.Res.Resources res, System.Int32 id) [0x00044] in :0
at Android.Graphics.BitmapFactory+<>c__DisplayClass25_0.b__0 () [0x00000] in :0
at System.Threading.Tasks.Task`1[TResult].InnerInvoke () [0x0000f] in :0
at System.Threading.Tasks.Task.Execute () [0x00010] in :0
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
Ex6:
java.lang.IllegalArgumentException: reportSizeConfigurations: ActivityRecord not found for: Token{3d2091b null}
at android.os.Parcel.readException(Parcel.java:1708)
at android.os.Parcel.readException(Parcel.java:1654)
at android.app.ActivityManagerProxy.reportSizeConfigurations(ActivityManagerNative.java:8401)
at android.app.ActivityThread.reportSizeConfigurations(ActivityThread.java:3125)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3068)
at android.app.ActivityThread.-wrap14(ActivityThread.java:-1)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1659)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6816)
at java.lang.reflect.Method.invoke(Method.java:-2)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:14
51)
Ex7:
android.support.v4.app.SuperNotCalledException: Fragment FragmentContainer{a73d66e #1 id=0x11} did not call through to super.onResume()
at android.support.v4.app.Fragment.performResume(Fragment.java:2403)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1465)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Method.java:-2)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
Ex8:
Xamarin Exception Stack:
Java.Lang.Error: Exception of type 'Java.Lang.Error' was thrown.
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in :0
at Java.Interop.JniEnvironment+InstanceMethods.CallNonvirtualVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00089] in <26daccb04dc641819234102c21fb48e0>:0
at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0005d] in <26daccb04dc641819234102c21fb48e0>:0
at Android.Views.View.Draw (Android.Graphics.Canvas canvas) [0x00031] in :0
at Xamarin.Forms.Platform.Android.ScrollViewRenderer.Draw (Android.Graphics.Canvas canvas) [0x0000d] in <173f39d71f0d4d928f5bbea42e96ffa8>:0
at Android.Views.View.n_Draw_Landroid_graphics_Canvas_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_canvas) [0x0000f] in :0
at (wrapper dynamic-method) System.Object:89e10ba0-7d74-443b-8d59-0e936efe0c75 (intptr,intptr,intptr)
at java.lang.StackOverflowError
at android.text.Layout.draw(Layout.java:213)
at android.text.BoringLayout.draw(BoringLayout.java:400)
at android.widget.TextView.onDraw(TextView.java:5780)
at android.view.View.draw(View.java:14636)
at android.view.View.getDisplayList(View.java:13568)
at android.view.View.getDisplayList(View.java:13612)
at android.view.View.draw(View.java:14349)
at android.view.ViewGroup.drawChild(ViewGroup.java:3155)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3031)
at android.view.View.getDisplayList(View.java:13566)
at android.view.View.getDisplayList(View.java:13612)
at android.view.View.draw(View.java:14349)
Ex9:
java.lang.IllegalArgumentException: reportSizeConfigurations: ActivityRecord not found for: Token{63ff12e ActivityRecord{45507a9 u0 com.higgx.studying/md5f86dd3651b84190e5d2506587b29c5c3.MainActivity t2465 f}}
at android.os.Parcel.readException(Parcel.java:1687)
at android.os.Parcel.readException(Parcel.java:1636)
at android.app.ActivityManagerProxy.reportSizeConfigurations(ActivityManagerNative.java:6946)
at android.app.ActivityThread.reportSizeConfigurations(ActivityThread.java:2850)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2793)
at android.app.ActivityThread.-wrap12(ActivityThread.java:-1)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1527)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Method.java:-2)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1075)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
Hello!
I use MediaPlugin from James Montemagno to get an image (github.com/jamesmontemagno/MediaPlugin). This saves an image file in a specified path, wether the user chooses to take the image from the camera or from the gallery.
Now, the only thing I have is the path of the image's file. I want to take this image and crop it automatically in a square (centered in the image) removing top and bottom excess (or left and right excess if the image is in landscape).
I have only found answers saying that I should use System.Drawing.Bitmap but this is an only Windows class... Any suggestion?
whenever I click on the listview to call another page, it gets selected, making it impossible to click on that item again, how to solve it?
private async void MenuItemsListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var select = (MasterDetailPage1MenuItem)e.SelectedItem;
if (select.Id == 0)
{
await App.NavigateMasterDetail(new Page1());
}
else
{
await App.NavigateMasterDetail(new Page2());
}
>>>>MenuItemsListView.SelectedItem = null; >>> Error
}
I've posted this on a few of the other sections in the forums, but after not hearing anything (other than one other person having the same issue), I figured I'd try this group.
We are trying to target the latest nightly build, mainly so we can try and see how the nightly build's WPF support has come along; however, as soon as we do so and add the Xamarin.Forms.Platform.WPF references to a WPF project, we are unable to build the WPF project.
We receive the following error:
C:\Users....nuget\packages\xamarin.forms\3.1.0.304117-nightly\build\netstandard1.0\Xamarin.Forms.targets(35,3): error MSB4062: The "Xamarin.Forms.Build.Tasks.GetTasksAbi" task could not be loaded from the assembly C:\Users....nuget\packages\xamarin.forms\3.1.0.304117-nightly\build\netstandard1.0\Xamarin.Forms.Build.Tasks.dll. Could not load file or assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified. Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.
Has anyone else ran into this before and does anyone know what I need to do to resolve the issue?
Thanks in advance!
For further information, the individual stated:
I got the same error on exercise 2 from XAM150.
We have the following navigation hierarchy in place:
Login (ContentPage)
-> Home (ContentPage)
--> List of Items (ContentPage)
---> Details View (TabbedPage)
----> Add Entry (ContentPage without NavigationBar)
----> Read Only View Entry (ContentPage)
On the Add Entry page, we removed the navigation bar so we could add a guard to the back navigation so users do not lose their data from accidental taps. We also have a button on the TabbedPage that pulls up the device camera allowing users to capture pictures for later use.
The problem comes into play when returning to the TabbedPage (Details View), from either the Camera or the Add Entry screen. The tabbedpage resizes itself and the tabs pushed past the bottom of the screen on iOS. Checking the page size before and after navigation shows that the TabbedPage is resizing itself based on the previous page height (i.e. a page without the navigation bar or the screen the plugin displays when capturing photos).
Rotating the phone to landscape and back to portrait corrects the sizing issue but that is obviously a major issue for our users. We have tried to set the height of the page based on the height of the tabbedpage when it first renders but that is being ignored as well.
This is also not a constant issue. One developer can build the app using the Ad-Hoc configuration and the problem does not exist; however, if he builds using debug, it is present. Another dev has the problem regardless of Ad-Hoc or Debug.
We have one dev on the team staying up to date with Xamarin updates while others are staying one or two behind in case of problems. The dev with the most current version of Xamarin and VS2017 has the problem regardless of configuration. We have updated NUget packages, completely deleted the local repository, rolled back to an old branch and nothing seems to fix this issue.
Has anyone else experienced this problem? The pages in question have not changed in a few months so no recent code changes were the obvious source.
I have a xamarin forms app which connects fine if the web api is NON-SSL. I have written a windows console project to connect to the same web api(both ssl and non-ssl) and seems to work fine. I am using a self-signed certificate. Is this is a in Xamarin Forms?
whenever I click on the listview to call another page, it gets selected, making it impossible to click on that item again, how to solve it?
private async void MenuItemsListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var select = (MasterDetailPage1MenuItem)e.SelectedItem;
if (select.Id == 0)
{
await App.NavigateMasterDetail(new Page1());
}
else
{
await App.NavigateMasterDetail(new Page2());
}
>>>>MenuItemsListView.SelectedItem = null; >>> Error
}
I've posted this on a few of the other sections in the forums, but after not hearing anything (other than one other person having the same issue), I figured I'd try this group.
We are trying to target the latest nightly build, mainly so we can try and see how the nightly build's WPF support has come along; however, as soon as we do so and add the Xamarin.Forms.Platform.WPF references to a WPF project, we are unable to build the WPF project.
We receive the following error:
C:\Users....nuget\packages\xamarin.forms\3.1.0.304117-nightly\build\netstandard1.0\Xamarin.Forms.targets(35,3): error MSB4062: The "Xamarin.Forms.Build.Tasks.GetTasksAbi" task could not be loaded from the assembly C:\Users....nuget\packages\xamarin.forms\3.1.0.304117-nightly\build\netstandard1.0\Xamarin.Forms.Build.Tasks.dll. Could not load file or assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified. Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.
Has anyone else ran into this before and does anyone know what I need to do to resolve the issue?
Thanks in advance!
For further information, the individual stated:
I got the same error on exercise 2 from XAM150.
Can anyone please help me on this ? Getting always this error while rebuild the app in xamarin.forms. The "ResolveLibraryProjectImports" task failed unexpectedly.
Thanks in advance.
I just want to implement any payment gateway in my Xamarin.Forms app. Could you please suggest any plugin or any documentation from where I get some help.
My background language is c#.
Is there any more recent information that can be shared as to the release date of Xamarin.Forms 3.0?
We are looking to start building a number of Xamarin apps and want to use the Embedding Feature as described in (https://blog.xamarin.com/glimpse-future-xamarin-forms-3-0/.
We would prefer to be able to start off with Native projects and embed Xamarin.Forms content especially to get early iterations of screens done which may later become fully native.
The roadmap states that this will be Q4 2017.
Many thanks,
Richard
The application is about home repairing Service. It has two Sides one the client who will call the repairing person and other is a repairing peson who will come to repair.
I'm Stuck in A Problem, I won't Understand that what should I use to Send request through Client to Nearby Repairing Persons on their Apps, One who will Accept the Request will be connected to the Client. both will also get each others data. And they keep on Connected Until the Work is done
I found a thread on removing TableSections from a TableView that was generated via XAML, which referred to this SO answer.
I tried doing the exact same thing but I end up with the following error:
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
What am I missing?
I have PageA + ViewModelA, and PageB + ViewModelB.
From A i'm calling PushAsync(B), editing some data, and calling PopAsync().
So now B becomes closed, and user returns to A.
But in B user changed some state, that should be update on A. What is the correct way to notify A to update state (and it would be better to have access to ViewModelB).
I am using following code for opening google from my xamarin forms app.
Device.OpenUri(new Uri("http://www.google.com"));
I am also saving a string in my local DB using the following code.
Application.Current.Properties["MyIP"] = mystring;
I want to open the browser and search this keyword automatically. Is it possible?
Thanks in advance.
The application is about home repairing Service. It has two Sides one the client who will call the repairing person and other is a repairing peson who will come to repair.
I'm Stuck in A Problem, I won't Understand that what should I use to Send request through Client to Nearby Repairing Persons on their Apps, One who will Accept the Request will be connected to the Client. both will also get each others data. And they keep on Connected Until the Work is done
I found a thread on removing TableSections from a TableView that was generated via XAML, which referred to this SO answer.
I tried doing the exact same thing but I end up with the following error:
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
What am I missing?
I have a Label with a lot of formatted text that is added to the Label with .FormattedText . I have tested this on a real iPhone 5, iPhone 8 emulator and the iPhone 8 Plus emulator. No problem while running on the iPhone 5 and 8, but running on the iPhone 8 Plus it doesn't display any text at all. If I remove some of the text it works fine!
Is there some known limitations for the length of the formatted text that only appears on the iPhone 8 Plus phone?
Hello,
I'm getting the below exception on Android when resuming an app from clicking on a push notification.
Platform.LayoutRootPage (Xamarin.Forms.Page page, System.Int32 width, System.Int32 height)
System.NullReferenceException: Object reference not set to an instance of an object
Platform.LayoutRootPage (Xamarin.Forms.Page page, System.Int32 width, System.Int32 height)
IPlatformLayout.OnLayout (System.Boolean changed, System.Int32 l, System.Int32 t, System.Int32 r, System.Int32 b)
PlatformRenderer.OnLayout (System.Boolean changed, System.Int32 l, System.Int32 t, System.Int32 r, System.Int32 b)
ViewGroup.n_OnLayout_ZIIII (System.IntPtr jnienv, System.IntPtr native__this, System.Boolean changed, System.Int32 l, System.Int32 t, System.Int32 r, System.Int32 b)
(wrapper dynamic-method) System.Object.44a2ab36-fd3c-4b03-8761-78b3d1b454b7(intptr,intptr,bool,int,int,int,int)
There is a bug filed here:
https://bugzilla.xamarin.com/show_bug.cgi?id=60346
Using FormsApplicationActivity doesn't seem to be a good workaround for me as I need to support material design.