The app displays images every 5 seconds that pulls from a folder. It also pulls an mp3 with the same name which plays some audio (for instance, the name of the object being displayed). That way, a baby can see an object, say an apple, hear apple, see "apple" written below, and then move randomly to the next object.
The app illustrates a bit of a GUI/display images, access to files, mediaplayer, timer and multithreading.
'Bits: flash cards present for my one year old nephew
'8/18/2013
'The program opens randomly a picture from a language directory, and the same name .mp3 file from that directory.
'Options eventually will include to select the directory (therefore, several languages can be selected), select the time
'the pic is in display, and to mute the voice, so, that the parents can be the ones saying the word. Also we want to have
'the option to pass card with the press of a Button.
'To avoid accidental exits, as the baby may touch the screen with the hand, the exit of presentation mode (to go into the
'menu) works by pressing two buttons at the same time.
'Thanks to Gigatron (GTR) as I looked at some of his code for learning...
'Now we want the system to cover the screen, no matter what screen and orientation...
'Changing things with reference to 100% is not enough as everything is bound by Panel.
'See for that the two lines of code below.
'Then we refer the position of the objects also respect to the screen/Activity (% notation)
'Notice that the notation is top and left. So, 0% means all the way to the left, and all the
'way to the top.
'Things explained in detail in page 72 of the beginners guide.
'
'Then, we finally add to it the capability to rotate the screen. For that, all what we need to do is to go
'to "Project>>Orientations supported" AND change it To "both" (it was in "landscape").
'In other words, if both are allowed, when we rotate the screen, the activity is recreated
'with the new reference axis following the position of the tablet. Otherwise, the axis just
'follow the orientation.
'
'We will present an image every number of seconds, with timer, eventually selected by customer, but we will load the
'files in the background process.
'
'With every timer click the UI will make sure the loading process is done, then take the info and move it to a
'save place before running again the loading thread. Not sure the copy works for MediaPlayer elements, so, I have two
'player objects and I switch from one to the other. Play one while loading the other.
'Activity module
Sub Process_Globals
'These global variables will be declared once when the application starts.
'These variables can be accessed from all modules.
Dim time As Timer
End Sub
Sub Globals
'These global variables will be redeclared each time the activity is created.
'These variables can only be accessed from this module.
Dim cnv As Canvas
Dim graphpanel As Panel
Dim clr As Int
Dim Label1 As Label
Dim Orientation As String
'Directory name to be selected by menu
Dim Question_Number,Old_Question_Number As Int
Dim FileList As List
Dim Card_Name, Card_Name_Buffer As String
Dim Card, Card_Buffer As Bitmap
Dim SrcRect, DestRect As Rect
Dim MP1,MP2 As MediaPlayer 'One is loaded while the other is played
Dim MP1_Busy As Boolean
'Dim tic As Int 'Number of seconds in each picture
Dim LoadFiles As Thread
End Sub
Sub Activity_Create(FirstTime As Boolean)
Activity.LoadLayout("bitsscreen") 'nothing special just graphpanel + 1 imageView in layout
graphpanel.Width=100%x
graphpanel.Height=100%y
Label1.Width=100%x
Label1.Height=20%y
Label1.TextSize=15%y
Label1.Left=50%x-Label1.Width/2
Label1.Top=80%y
Label1.Gravity=Gravity.CENTER_HORIZONTAL
FileList=File.ListFiles("/sdcard/Pictures/bits")
cnv.Initialize(graphpanel)
MP1.Initialize2("MP")
MP2.Initialize2("MP")
MP1_Busy=False
Load_card
LoadFiles.Initialise("GO")
time.Initialize("time",1000)
time.Enabled=True
End Sub
Sub Activity_Resume
time.Enabled = True
time_Tick
End Sub
Sub Activity_Pause (UserClosed As Boolean)
If MP1.IsPlaying Then MP1.Pause
If MP2.IsPlaying Then MP2.Pause
time.Enabled = False
End Sub
Sub time_Tick
time.Enabled=False
Do While LoadFiles.Running==True
Loop
MP1_Busy=Not(MP1_Busy)
Card=Card_Buffer
Card_Name=Card_Name_Buffer
Old_Question_Number=Question_Number
LoadFiles.Start(Me,"Load_card", Null)
time.Initialize("time",5000)
time.Enabled=True
Show_card
End Sub
Sub Show_card 'This shows whatever image was on the buffer when timer call it
Dim ratio As Float
Dim Rec As Rect
Rec.Initialize(0,0,100%x,100%y)
cnv.DrawRect(Rec,Colors.White,True,5dip)
Label1.Text=Card_Name
SrcRect.initialize(0,0,Card.Width,Card.Height)
'Fit picture to the limits without distorting
ratio=100%x/Card.Width
If (ratio>80%y/Card.Height) Then
ratio=80%y/(2*Card.Height)
DestRect.initialize(50%x-Card.Width*ratio,0,50%x+Card.Width*ratio,80%y)
Else
ratio=ratio/2
DestRect.initialize(0,40%y-Card.Height*ratio,100%x,40%y+Card.Height*ratio)
End If
cnv.DrawBitmap(Card,SrcRect,DestRect)
graphpanel.Invalidate ' invalidate panel after drawing the stars (make it visible)
If MP1_Busy=True Then
MP1.Play
Else
MP2.Play
End If
End Sub
Sub Load_card 'This loads an image in the background
Dim ratio As Float
Question_Number=Rnd(0,FileList.Size)
Card_Name_Buffer=FileList.Get(Question_Number)
Do While (File.IsDirectory("/sdcard/Pictures/bits",Card_Name_Buffer) OR _
Not(Card_Name_Buffer.EndsWith(".jpg")) OR (Question_Number==Old_Question_Number))
Question_Number=Rnd(0,FileList.Size)
Card_Name_Buffer=FileList.Get(Question_Number)
Loop
Card_Buffer.Initialize("/sdcard/Pictures/bits",Card_Name_Buffer)
Card_Name_Buffer=Card_Name_Buffer.SubString2(0,Card_Name_Buffer.Length-4)
If MP1_Busy==True Then
MP2.Load("/sdcard/Pictures/bits",Card_Name_Buffer&".mp3")
Else
MP1.Load("/sdcard/Pictures/bits",Card_Name_Buffer&".mp3")
End If
End Sub
PS.: And no, I am not going backwards from Java into Basic4Android. :) I started a year ago on Basic4Android because it was easier for me to ramp up but then I decided to learn Java... Now I still go to Basic4Android as I am more familiar with its libraries, but only till I get better with the Android SDK :)
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