Android Question Login Activity call

[rubach]

Hi,
I am devoloping a project from the this example https://www.b4x.com/android/forum/threads/appcompat-with-toolbar-minimal-example.79896/

In this case, my app nedd a login activity, this is the code of main activity:

Sub Activity_Create(FirstTime As Boolean)
        If (FirstTime) Then
        DBFileDir = File.DirInternal
        DBFileName = clParametros.DbNombre
        If File.Exists(DBFileDir, DBFileName) = False Then
            DB.Initialize(DBFileDir, DBFileName, True)
            'creo tablas
            
        End If
        DB.Initialize(DBFileDir, DBFileName, False)
        
        'cargo los parametros
        clParametros.LoadParametros
        If clParametros.SessionId.Length=0 Then
            'StartActivity(acLogin)
        End If
    End If
    Log("menu main")
    cartBitmap = LoadBitmap(File.DirAssets, "cart.png")
    Activity.LoadLayout("1")
    ToolbarHelper.Initialize
    ToolbarHelper.ShowUpIndicator = True 'set to true to show the up arrow
    ToolbarHelper.UpIndicatorDrawable = BitmapToBitmapDrawable(LoadBitmap(File.DirAssets, "hamburger.png"))
    ACToolBarLight1.InitMenuListener
    sm.Initialize("sm")
    Dim offset As Int = 100dip
    sm.BehindOffset = offset
    sm.Mode = sm.LEFT
    Dim lftMenu As Panel

    lftMenu.Initialize("")
    sm.Menu.AddView(lftMenu, 0, 0, 100%x - offset, 100%y)
    lftMenu.LoadLayout("Left")
    For i = 1 To 30
        ListView1.AddSingleLine("Item " & i)
    Next
    Dim jo As JavaObject = ACToolBarLight1
    Dim xl As XmlLayoutBuilder
    jo.RunMethod("setPopupTheme", Array(xl.GetResourceId("style", "ToolbarMenu")))
End Sub

Sub Activity_Resume
   Log("menu resume")
   If clParametros.SessionId.Length=0 Then
       StartActivity(acLogin)
   End If
End Sub

In the loginActivity, after login I call StartActivity(main)


The problem it is, when I call StartActivity(acLogin) in a Activiti_resume of Main, the activity show the layout of main at firts for a few secconds(1 o 2) and after load the login layout, it is a blink bad efect.

The other option, it is to call in Main Activity_Create, but in this case, I have some problems:

1-When I go back to main, after login, the layout show in blank.
2-If I tryed to load the layout or refresh, in the Activity_Resume, trows an error in null pointer exception in object AcMenu when try to add items of the menu, I think for this part of code

#If Java

public boolean _onCreateOptionsMenu(android.view.Menu menu) {
    if (processBA.subExists("activity_createmenu")) {
        processBA.raiseEvent2(null, true, "activity_createmenu", false, new de.amberhome.objects.appcompat.ACMenuWrapper(menu));
        return true;
    }
    else
        return false;
}
#End If

I belive that I have more than one error, but I don not know what..

Could any giveme some help to solve the problem? or any example? I review a few examples in the Forum...
Thank you!

 

[Erel]

It should be better to start the second activity from Activity_Create. You don't need to load the layout in Activity_Resume. Just show the second activity after you loaded the layout.

 

[rubach]

Thank you for you answer Erel,
theh problem it is that not work if I will call the activitity in the Create, trows an error, this is the code:

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
   
    If (FirstTime) Then
        DBFileDir = File.DirInternal
        DBFileName = clParametros.DbNombre
        If File.Exists(DBFileDir, DBFileName) = False Then
            DB.Initialize(DBFileDir, DBFileName, True)
            'create tables
        End If
        DB.Initialize(DBFileDir, DBFileName, False)
        'load parameters
        clParametros.LoadParametros
        If clParametros.SessionId.Length=0 Then
            StartActivity(acLogin)
        End If
    End If
    Log("create main")
    cartBitmap = LoadBitmap(File.DirAssets, "cart.png")
    Activity.LoadLayout("1")
    ToolbarHelper.Initialize
    ToolbarHelper.ShowUpIndicator = True 'set to true to show the up arrow
    ToolbarHelper.UpIndicatorDrawable = BitmapToBitmapDrawable(LoadBitmap(File.DirAssets, "hamburger.png"))
    ACToolBarLight1.InitMenuListener
    sm.Initialize("sm")
    Dim offset As Int = 100dip
    sm.BehindOffset = offset
    sm.Mode = sm.LEFT
    Dim lftMenu As Panel

    lftMenu.Initialize("")
    sm.Menu.AddView(lftMenu, 0, 0, 100%x - offset, 100%y)
    lftMenu.LoadLayout("Left")
    For i = 1 To 30
        ListView1.AddSingleLine("Item " & i)
    Next
    Dim jo As JavaObject = ACToolBarLight1
    Dim xl As XmlLayoutBuilder
    jo.RunMethod("setPopupTheme", Array(xl.GetResourceId("style", "ToolbarMenu")))
   
    If StateManager.RestoreState(Activity, "Main", 60) = False Then
        'set the default values
    '    EditText1.Text = "Default text"
    '    EditText2.Text = "Default text"
    End If
   
End Sub



Sub ACToolBarLight1_NavigationItemClick
    sm.ShowMenu
End Sub

Sub Activity_CreateMenu(Menu As ACMenu)
    Menu.Clear
    Menu.Add(0, 0, "Overflow1", Null)
    Menu.Add(0, 0, "Overflow2", Null)
    Menu.Add(0, 0, "Overflow3", Null)
    Dim item As ACMenuItem = ACToolBarLight1.Menu.Add2(0, 0, "cart", Null)
    item.ShowAsAction = item.SHOW_AS_ACTION_ALWAYS
    UpdateIcon("cart", AddBadgeToIcon(cartBitmap, badge))
End Sub

The error:
Error occurred on line: 98 (Main)
java.lang.NullPointerException: Attempt to read from field 'anywheresoftware.b4a.BA b4a.example.main.activityBA' on a null object reference
at b4a.example.main._activity_createmenu(main.java:538)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:738)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:357)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:260)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at b4a.example.main._onCreateOptionsMenu(main.java:786)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.runHook(BA.java:160)
at b4a.example.main.onCreateOptionsMenu(main.java:136)
at android.app.Activity.onCreatePanelMenu(Activity.java:3144)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:364)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:93)
at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:332)
at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:93)
at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:454)
at android.support.v7.app.ToolbarActionBar$1.run(ToolbarActionBar.java:55)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:907)
at android.view.Choreographer.doCallbacks(Choreographer.java:709)
at android.view.Choreographer.doFrame(Choreographer.java:641)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:893)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)

I think that this error es because this when execute this code, the layout not are loaded

#If Java

public boolean _onCreateOptionsMenu(android.view.Menu menu) {
    if (processBA.subExists("activity_createmenu")) {
        processBA.raiseEvent2(null, true, "activity_createmenu", false, new de.amberhome.objects.appcompat.ACMenuWrapper(menu));
        return true;
    }
    else
        return false;
}
#End If

Line 98 it is: Sub Activity_CreateMenu(Menu As ACMenu)

Any idea of how call in Activity_create with out error?

 

[Erel]

I see. Try to show it from Activity_CreateMenu. If you are unable to solve it then create a small project and upload it.