Android Question B4XFloatTextField Crashes App

[james_sgp]

I`ve just noticed a problem with the B4XFloatTextField in my app when I press the Backspace ket to delete its contents; when I`ve deleted everything if I press Backspace again the app crashes. Is this a normal phenomenon on B4XFloatTextField?

java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
at RAID.FirstAid.main$HandleKeyDelayed.runDirectly(main.java:232)
at RAID.FirstAid.main.onKeyDown(main.java:219)
at android.view.KeyEvent.dispatch(KeyEvent.java:3350)
at android.app.Activity.dispatchKeyEvent(Activity.java:3451)
at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:108)
at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:84)
at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:126)
at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:535)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:2533)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:564)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:6035)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5890)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5343)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5396)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5362)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5521)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5370)

 

[Erel]

It is not related to B4XFloatTextField. Post your Activity_KeyPress code.

 

[james_sgp]

Sub Activity_KeyPress (KeyCode As Int)
    If KeyCode = KeyCodes.KEYCODE_BACK Then
        If Msgbox2("You hit the BACK button, do you want to close the app?", "", "Yes", "", "No",LoadBitmap (File.DirAssets, "question.png")) = DialogResponse.POSITIVE Then
            ExitApplication
        Else
            Return
        End If
    End If
End Sub

 

[DonManfred]

You never should use MsgBox. Use the Async methods instead.

Example:

Msgbox2Async("Delete?", "Title", "Yes", "Cancel", "No", Null, False)
Wait For Msgbox_Result (Result As Int)
If Result = DialogResponse.POSITIVE Then
   '...
End If

untested code

Sub Activity_KeyPress (KeyCode As Int)
    If KeyCode = KeyCodes.KEYCODE_BACK Then
        Msgbox2Async("You hit the BACK button, do you want to close the app?", "", "Yes", "", "No", LoadBitmap (File.DirAssets, "question.png"), False)
        Wait For Msgbox_Result (Result As Int)
        If Result = DialogResponse.POSITIVE Then
            ExitApplication
        End If
    Else
        Return
    End If
End Sub

Maybe you need to create a resumeable sub to show the msgbox.

 

[Erel]

Sub Activity_KeyPress (KeyCode As Int)

There are many mistakes in this short code.

1. The event signature is wrong. The return type is missing. This is the reason for the crash.
2. You should never use Msgbox or Msgbox2. Only the async version.
3. You shouldn't use ExitApplication.

Correct code: https://www.b4x.com/android/forum/t...async-in-activity_keypress.110438/post-689331

 

[james_sgp]

Erel, thanks...i'd copied from somewhere. But will make corrections.
Much appeeciated.