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Core

List of types:

Application
Bit
DateTime
Exception
Intent
Keywords
LayoutValues
Notification
RemoteViews
ResumableSub
Service
String
StringBuilder
Timer

Application


Events:

None

Members:


  Icon As Bitmap [read only]

  LabelName As String [read only]

  PackageName As String [read only]

  VersionCode As Int [read only]

  VersionName As String [read only]

Members description:

Icon As Bitmap [read only]
Returns the application icon.
LabelName As String [read only]
Returns the application name (ApplicationLabel attribute).
PackageName As String [read only]
Returns the application package name.
VersionCode As Int [read only]
Returns the application version code (VersionCode attribute).
VersionName As String [read only]
Returns the application version name (VersionName attribute).

Bit

Bit is a predefined object containing bitwise related methods.
Example:
Dim flags As Int
flags = Bit.Or(100, 200)

Events:

None

Members:


  And (N1 As Int, N2 As Int) As Int

  InputStreamToBytes (In As java.io.InputStream) As Byte()

  Not (N As Int) As Int

  Or (N1 As Int, N2 As Int) As Int

  ParseInt (Value As String, Radix As Int) As Int

  ShiftLeft (N As Int, Shift As Int) As Int

  ShiftRight (N As Int, Shift As Int) As Int

  ToBinaryString (N As Int) As String

  ToHexString (N As Int) As String

  ToOctalString (N As Int) As String

  UnsignedShiftRight (N As Int, Shift As Int) As Int

  Xor (N1 As Int, N2 As Int) As Int

Members description:

And (N1 As Int, N2 As Int) As Int
Returns the bitwise AND of the two values.
InputStreamToBytes (In As java.io.InputStream) As Byte()
Reads the data from the input stream and writes it into an array of bytes.
The input stream is automatically closed at the end.
Not (N As Int) As Int
Returns the bitwise complement of the given value.
Or (N1 As Int, N2 As Int) As Int
Returns the bitwise OR of the two values.
ParseInt (Value As String, Radix As Int) As Int
Parses Value as an integer using the specified radix.
Radix - Should be between 2 to 36.
ShiftLeft (N As Int, Shift As Int) As Int
Shifts N left.
Shift - Number of positions to shift.
ShiftRight (N As Int, Shift As Int) As Int
Shifts N right.
Keeps the original value sign
Shift - Number of positions to shift.
ToBinaryString (N As Int) As String
Returns a string representation of N in base 2.
ToHexString (N As Int) As String
Returns a string representation of N in base 16.
ToOctalString (N As Int) As String
Returns a string representation of N in base 8.
UnsignedShiftRight (N As Int, Shift As Int) As Int
Shifts N right.
Shifts zeroes in the leftmost positions.
Shift - Number of positions to shift.
Xor (N1 As Int, N2 As Int) As Int
Returns the bitwise XOR of the two values.

DateTime

Date and time related methods.
DateTime is a predefined object. You should not declare it yourself.
Date and time values are stored as ticks. Ticks are the number of milliseconds since January 1, 1970 00:00:00 UTC.
This value is too large to be stored in an Int variable. It should only be stored in a Long variable.
The methods DateTime.Date and DateTime.Time convert the ticks value to a string.
You can get the current time with DateTime.Now.
Example:
Dim now As Long
now = DateTime.Now
Msgbox("The date is: " & DateTime.Date(now) & CRLF & _
  "The time is: " & DateTime.Time(now), "")

Events:

TimeChanged

Members:


  Add (Ticks As Long, Years As Int, Months As Int, Days As Int) As Long

  Date (Ticks As Long) As String

  DateFormat As String

  DateParse (Date As String) As Long

  DateTimeParse (Date As String, Time As String) As Long

  DeviceDefaultDateFormat As String [read only]

  DeviceDefaultTimeFormat As String [read only]

  GetDayOfMonth (Ticks As Long) As Int

  GetDayOfWeek (Ticks As Long) As Int

  GetDayOfYear (Ticks As Long) As Int

  GetHour (Ticks As Long) As Int

  GetMinute (Ticks As Long) As Int

  GetMonth (Ticks As Long) As Int

  GetSecond (Ticks As Long) As Int

  GetTimeZoneOffsetAt (Date As Long) As Double

  GetYear (Ticks As Long) As Int

  ListenToExternalTimeChanges

  Now As Long [read only]

  SetTimeZone (OffsetHours As Double)

  TicksPerDay As Long

  TicksPerHour As Long

  TicksPerMinute As Long

  TicksPerSecond As Long

  Time (Ticks As Long) As String

  TimeFormat As String

  TimeParse (Time As String) As Long

  TimeZoneOffset As Double [read only]

Members description:

Add (Ticks As Long, Years As Int, Months As Int, Days As Int) As Long
Returns a ticks value which is the result of adding the specified time spans to the given ticks value.
Pass negative values if you want to subtract the values.
Example:
Dim Tomorrow As Long
Tomorrow = DateTime.Add(DateTime.Now, 0, 0, 1)
Log("Tomorrow date is: " & DateTime.Date(Tomorrow))
Date (Ticks As Long) As String
Returns a string representation of the date (which is stored as ticks).
The date format can be set with the DateFormat keyword.
Example:
Log("Today is: " & DateTime.Date(DateTime.Now))
DateFormat As String
Gets or sets the format used to parse date strings.
See this page for the supported patterns:
formats.
The default pattern is MM/dd/yyyy (04/23/2002 for example).
DateParse (Date As String) As Long
Parses the given date string and returns its ticks representation.
An exception will be thrown if parsing fails.
Example:
Dim SomeTime As Long
SomeTime = DateTime.DateParse("02/23/2007")
DateTimeParse (Date As String, Time As String) As Long
Parses the given date and time strings and returns the ticks representation.
DeviceDefaultDateFormat As String [read only]
Returns the default date format based on the device selected language.
DeviceDefaultTimeFormat As String [read only]
Returns the default time format based on the device selected language.
GetDayOfMonth (Ticks As Long) As Int
Returns the day of month component from the ticks value.
Values are between 1 to 31.
GetDayOfWeek (Ticks As Long) As Int
Returns the day of week component from the ticks value.
Values are between 1 to 7, where 1 means Sunday.
You can use the AHLocale library if you need to change the first day.
GetDayOfYear (Ticks As Long) As Int
Returns the day of year component from the ticks value.
Values are between 1 to 366.
GetHour (Ticks As Long) As Int
Returns the hour of day component from the ticks value.
Values are between 0 to 23.
GetMinute (Ticks As Long) As Int
Returns the minutes within a hour component from the ticks value.
Values are between 0 to 59.
GetMonth (Ticks As Long) As Int
Returns the month of year component from the ticks value.
Values are between 1 to 12.
GetSecond (Ticks As Long) As Int
Returns the seconds within a minute component from the ticks value.
Values are between 0 to 59.
GetTimeZoneOffsetAt (Date As Long) As Double
Returns the offset measured in hours from UTC at the specified date (offset can change due to daylight saving settings).
GetYear (Ticks As Long) As Int
Returns the year component from the ticks value.
ListenToExternalTimeChanges
Creates a dynamic broadcast receiver that listens to the "time-zone changed" event and "time set" event.
By calling this method the time-zone will update automatically when the device time-zone changes.
DateTime_TimeChanged event will be raised when the time-zone changes or when the time is set.
Now As Long [read only]
Gets the current time as ticks (number of milliseconds since January 1, 1970).
SetTimeZone (OffsetHours As Double)
Sets the application time zone. This setting affect the conversions of dates to ticks value and vice versa (device default settings are not changed).
TicksPerDay As Long
TicksPerHour As Long
TicksPerMinute As Long
TicksPerSecond As Long
Time (Ticks As Long) As String
Returns a string representation of the time (which is stored as ticks).
The time format can be set with the TimeFormat keyword.
Example:
Log("The time now is: " & DateTime.Time(DateTime.Now))
TimeFormat As String
Gets or sets the format used to parse time strings.
See this page for the supported patterns:
formats.
The default pattern is HH:mm:ss (23:45:12 for example).
TimeParse (Time As String) As Long
Parses the given time string and returns its ticks representation.
Note that the returned value date will be today.
TimeZoneOffset As Double [read only]
Returns the current offset measured in hours from UTC.

Exception

Holds a thrown exception.
You can access the last thrown exception by calling LastException.
For example:
Try
Dim in As InputStream
in = File.OpenInput(File.DirInternal, "SomeMissingFile.txt")
'...
Catch
Log(LastException.Message)
End Try
If in.IsInitialized Then in.Close

Events:

None

Members:


  IsInitialized As Boolean

  Message As String [read only]

Members description:

IsInitialized As Boolean
Message As String [read only]

Intent

Intent objects are messages which you can send to the OS in order to do some external action.
The Intent object should be sent with StartActivity keyword.
See this page for a list of standard constants.
Example, launch YouTube application:
Dim Intent1 As Intent
Intent1.Initialize(Intent1.ACTION_MAIN, "")
Intent1.SetComponent("com.google.android.youtube/.HomeActivity")
StartActivity(Intent1)

Events:

None

Members:


  Action As String

  ACTION_APPWIDGET_UPDATE As String

  ACTION_CALL As String

  ACTION_EDIT As String

  ACTION_MAIN As String

  ACTION_PICK As String

  ACTION_SEND As String

  ACTION_VIEW As String

  AddCategory (Category As String)

  ExtrasToString As String

  Flags As Int

  GetData As String

  GetExtra (Name As String) As Object

  HasExtra (Name As String) As Boolean

  Initialize (Action As String, Uri As String)

  Initialize2 (Uri As String, Flags As Int)

  IsInitialized As Boolean

  PutExtra (Name As String, Value As Object)

  SetComponent (Component As String)

  SetType (Type As String)

  WrapAsIntentChooser (Title As String)

Members description:

Action As String
Gets or sets the Intent action.
ACTION_APPWIDGET_UPDATE As String
ACTION_CALL As String
ACTION_EDIT As String
ACTION_MAIN As String
ACTION_PICK As String
ACTION_SEND As String
ACTION_VIEW As String
AddCategory (Category As String)
Adds a category describing the intent required operation.
ExtrasToString As String
Returns a string containing the extra items. This is useful for debugging.
Flags As Int
Gets or sets the flags component.
GetData As String
Retrieves the data component as a string.
GetExtra (Name As String) As Object
Returns the item value with the given key.
HasExtra (Name As String) As Boolean
Tests whether an item with the given key exists.
Initialize (Action As String, Uri As String)
Initializes the object using the given Action and data Uri. Action can be one of the action constants or any other string.
Pass an empty string if a Uri is not required.
Initialize2 (Uri As String, Flags As Int)
Initializes the object by parsing the Uri.
Flags - Additional integer value. Pass 0 if it is not required.
Example:
Dim Intent1 As Intent
Intent1.Initialize2("http://www.basic4ppc.com", 0)
StartActivity(Intent1)
IsInitialized As Boolean
PutExtra (Name As String, Value As Object)
Adds extra data to the intent.
SetComponent (Component As String)
Explicitly sets the component that will handle this intent.
SetType (Type As String)
Sets the MIME type.
Example:
Intent1.SetType("text/plain")
WrapAsIntentChooser (Title As String)
Wraps the intent in another "chooser" intent. A dialog will be displayed to the user with the available services that can act on the intent.
WrapAsIntentChooser should be the last method called before sending the intent.

Keywords

These are the internal keywords.

Events:

None

Members:


  Abs (Number As Double) As Double

  ACos (Value As Double) As Double

  ACosD (Value As Double) As Double

  Array

  Asc (Char As Char) As Int

  ASin (Value As Double) As Double

  ASinD (Value As Double) As Double

  ATan (Value As Double) As Double

  ATan2 (Y As Double, X As Double) As Double

  ATan2D (Y As Double, X As Double) As Double

  ATanD (Value As Double) As Double

  BytesToString (Data() As Byte, StartOffset As Int, Length As Int, CharSet As String) As String

  CallSub (Component As Object, Sub As String) As Object

  CallSub2 (Component As Object, Sub As String, Argument As Object) As Object

  CallSub3 (Component As Object, Sub As String, Argument1 As Object, Argument2 As Object) As Object

  CallSubDelayed (Component As Object, Sub As String)

  CallSubDelayed2 (Component As Object, Sub As String, Argument As Object)

  CallSubDelayed3 (Component As Object, Sub As String, Argument1 As Object, Argument2 As Object)

  CancelScheduledService (Service As Object)

  Catch

  cE As Double

  Ceil (Number As Double) As Double

  CharsToString (Chars() As Char, StartOffset As Int, Length As Int) As String

  Chr (UnicodeValue As Int) As Char

  ConfigureHomeWidget (LayoutFile As String, EventName As String, UpdateIntervalMinutes As Int, WidgetName As String, CenterWidget As Boolean) As android.widget.RemoteViews

  Continue

  Cos (Radians As Double) As Double

  CosD (Degrees As Double) As Double

  cPI As Double

  CreateMap

  CRLF As String

  Density As Float

  Dim

  DipToCurrent (Length As Int) As Int

  DoEvents

  Exit

  ExitApplication

  False As Boolean

  File As File

  Floor (Number As Double) As Double

  For

  GetDeviceLayoutValues As LayoutValues

  GetType (object As Object) As String

  If

  InputList (Items As List, Title As CharSequence, CheckedItem As Int) As Int

  InputListAsync (Items As List, Title As CharSequence, CheckedItem As Int, Cancelable As Boolean) As Object

  InputMap (Items As Map, Title As CharSequence)

  InputMapAsync (Items As Map, Title As CharSequence, Cancelable As Boolean) As Object

  InputMultiList (Items As List, Title As CharSequence) As List

  Is

  IsBackgroundTaskRunning (ContainerObject As Object, TaskId As Int) As Boolean

  IsDevTool (ToolName As String) As Boolean

  IsNumber (Text As String) As Boolean

  IsPaused (Component As Object) As Boolean

  LastException As Exception

  LoadBitmap (Dir As String, FileName As String) As Bitmap

  LoadBitmapResize (Dir As String, FileName As String, Width As Int, Height As Int, KeepAspectRatio As Boolean) As Bitmap

  LoadBitmapSample (Dir As String, FileName As String, MaxWidth As Int, MaxHeight As Int) As Bitmap

  Log (Message As String)

  Logarithm (Number As Double, Base As Double) As Double

  LogColor (Message As String, Color As Int)

  Max (Number1 As Double, Number2 As Double) As Double

  Me As Object

  Min (Number1 As Double, Number2 As Double) As Double

  Msgbox (Message As CharSequence, Title As CharSequence)

  Msgbox2 (Message As CharSequence, Title As CharSequence, Positive As String, Cancel As String, Negative As String, Icon As android.graphics.Bitmap) As Int

  Msgbox2Async (Message As CharSequence, Title As CharSequence, Positive As String, Cancel As String, Negative As String, Icon As Bitmap, Cancelable As Boolean) As Object

  MsgboxAsync (Message As CharSequence, Title As CharSequence)

  Not (Value As Boolean) As Boolean

  Null As Object

  NumberFormat (Number As Double, MinimumIntegers As Int, MaximumFractions As Int) As String

  NumberFormat2 (Number As Double, MinimumIntegers As Int, MaximumFractions As Int, MinimumFractions As Int, GroupingUsed As Boolean) As String

  PerXToCurrent (Percentage As Float) As Int

  PerYToCurrent (Percentage As Float) As Int

  Power (Base As Double, Exponent As Double) As Double

  ProgressDialogHide

  ProgressDialogShow (Text As CharSequence)

  ProgressDialogShow2 (Text As CharSequence, Cancelable As Boolean)

  QUOTE As String

  Regex As Regex

  Return

  Rnd (Min As Int, Max As Int) As Int

  RndSeed (Seed As Long)

  Round (Number As Double) As Long

  Round2 (Number As Double, DecimalPlaces As Int) As Double

  Select

  Sender As Object

  Sin (Radians As Double) As Double

  SinD (Degrees As Double) As Double

  Sleep (Milliseconds As Int)

  SmartStringFormatter (Format As String, Value As Object) As String

  Sqrt (Value As Double) As Double

  StartActivity (Activity As Object)

  StartService (Service As Object)

  StartServiceAt (Service As Object, Time As Long, DuringSleep As Boolean)

  StartServiceAtExact (Service As Object, Time As Long, DuringSleep As Boolean)

  StopService (Service As Object)

  Sub

  SubExists (Object As Object, Sub As String) As Boolean

  TAB As String

  Tan (Radians As Double) As Double

  TanD (Degrees As Double) As Double

  ToastMessageShow (Message As CharSequence, LongDuration As Boolean)

  True As Boolean

  Try

  Type

  Until

  While

Members description:

Abs (Number As Double) As Double
Returns the absolute value.
ACos (Value As Double) As Double
Returns the angle measured with radians.
ACosD (Value As Double) As Double
Returns the angle measured with degrees.
Array
Creates a single dimension array of the specified type.
The syntax is: Array [As type] (list of values).
If the type is ommitted then an array of objects will be created.
Example:
Dim Days() As String
Days = Array As String("Sunday", "Monday", ...)
Asc (Char As Char) As Int
Returns the unicode code point of the given character or first character in string.
ASin (Value As Double) As Double
Returns the angle measured with radians.
ASinD (Value As Double) As Double
Returns the angle measured with degrees.
ATan (Value As Double) As Double
Returns the angle measured with radians.
ATan2 (Y As Double, X As Double) As Double
Returns the angle measured with radians.
ATan2D (Y As Double, X As Double) As Double
Returns the angle measured with degrees.
ATanD (Value As Double) As Double
Returns the angle measured with degrees.
BytesToString (Data() As Byte, StartOffset As Int, Length As Int, CharSet As String) As String
Decodes the given bytes array as a string.
Data - The bytes array.
StartOffset - The first byte to read.
Length - Number of bytes to read.
CharSet - The name of the character set.
Example:
Dim s As String
s = BytesToString(Buffer, 0, Buffer.Length, "UTF-8")
CallSub (Component As Object, Sub As String) As Object
Calls the given sub. CallSub can be used to call a sub which belongs to a different module.
However the sub will only be called if the other module is not paused. In that case an empty string will be returned.
You can use IsPaused to test whether a module is paused.
This means that one activity cannot call a sub of a different activity. As the other activity will be paused for sure.
CallSub allows an activity to call a service sub or a service to call an activity sub.
Note that it is not possible to call subs of code modules.
CallSub can also be used to call subs in the current module. Pass Me as the component in that case.
Example:
CallSub(Main, "RefreshData")
CallSub2 (Component As Object, Sub As String, Argument As Object) As Object
Similar to CallSub. Calls a sub with a single argument.
CallSub3 (Component As Object, Sub As String, Argument1 As Object, Argument2 As Object) As Object
Similar to CallSub. Calls a sub with two arguments.
CallSubDelayed (Component As Object, Sub As String)
CallSubDelayed is a combination of StartActivity, StartService and CallSub.
Unlike CallSub which only works with currently running components, CallSubDelayed will first start the target component if needed.
CallSubDelayed can also be used to call subs in the current module. Instead of calling these subs directly, a message will be sent to the message queue.
The sub will be called when the message is processed. This is useful in cases where you want to do something "right after" the current sub (usually related to UI events).
Note that if you call an Activity while the whole application is in the background (no visible activities), the sub will be executed once the target activity is resumed.
CallSubDelayed2 (Component As Object, Sub As String, Argument As Object)
Similar to CallSubDelayed. Calls a sub with a single argument.
CallSubDelayed3 (Component As Object, Sub As String, Argument1 As Object, Argument2 As Object)
Similar to CallSubDelayed. Calls a sub with two arguments.
CancelScheduledService (Service As Object)
Cancels previously scheduled tasks for this service.
Catch
Any exception thrown inside a try block will be caught in the catch block.
Call LastException to get the caught exception.
Syntax:
Try
...
Catch
...
End Try
cE As Double
e (natural logarithm base) constant.
Ceil (Number As Double) As Double
Returns the smallest double that is greater or equal to the specified number and is equal to an integer.
CharsToString (Chars() As Char, StartOffset As Int, Length As Int) As String
Creates a new String by copying the characters from the array.
Copying starts from StartOffset and the number of characters copied equals to Length.
Chr (UnicodeValue As Int) As Char
Returns the character that is represented by the given unicode value.
ConfigureHomeWidget (LayoutFile As String, EventName As String, UpdateIntervalMinutes As Int, WidgetName As String, CenterWidget As Boolean) As android.widget.RemoteViews
Creates a RemoteViews object based on the layout file. The compiler will generate the required XML files based on the parameters.
See the widgets tutorial for more information:
Widgets tutorial.
Note that all parameters must be strings or numbers as they are read by the compiler.
LayoutFile - The widget layout file.
EventName - Sets the subs that will handle the RemoteViews events.
UpdateIntervalMinutes - Sets the update interval. Pass 0 to disable automatic updates. Minimum value is 30 (or 0).
WidgetName - The name of the widget as appears in the widgets list.
CenterWidget - Whether to center the widget.
Continue
Stops executing the current iteration and continues with the next one.
Cos (Radians As Double) As Double
Calculates the trigonometric cosine function. Angle measured in radians.
CosD (Degrees As Double) As Double
Calculates the trigonometric cosine function. Angle measured in degrees.
cPI As Double
PI constant.
CreateMap
Creates a Map with the given key / value pairs.
The syntax is: CreateMap (key1: value1, key2: value2, ...)
Example:
Dim m As Map = CreateMap("January": 1, "February": 2)
CRLF As String
New line character. The value of Chr(10).
Density As Float
Returns the device scale, which is DPI / 160.
(DPI stands for dots per inch).
Dim
Declares a variable.
Syntax:
Declare a single variable:
Dim variable name [As type] [= expression]
The default type is String.

Declare multiple variables. All variables will be of the specified type.
Dim [Const] variable1 [= expression], variable2 [= expression], ..., [As type]
Note that the shorthand syntax only applies to Dim keyword.
Example:Dim a = 1, b = 2, c = 3 As Int

Declare an array:
Dim variable(Rank1, Rank2, ...) [As type]
Example:Dim Days(7) As String
The actual rank can be omitted for zero length arrays.
DipToCurrent (Length As Int) As Int
Scales the value, which represents a specific length on a default density device (Density = 1.0),
to the current device.
For example, the following code will set the width value of this button to be the same physical size
on all devices.
Button1.Width = DipToCurrent(100)

Note that a shorthand syntax for this method is available. Any number followed by the string 'dip'
will be converted in the same manner (no spaces are allowed between the number and 'dip').
So the previous code is equivalent to:
Button1.Width = 100dip 'dip -> density independent pixel
DoEvents
DoEvents is deprecated. It can lead to stability issues.
Consider using Sleep(0) instead.
Exit
Exits the most inner loop.
Note that Exit inside a Select block will exit the Select block.
ExitApplication
Immediately ends the application and stops the process.
Most applications should not use this method and prefer Activity.Finish which lets the OS decide when the process is killed.
False As Boolean
File As File
Files related methods.
Floor (Number As Double) As Double
Returns the largest double that is smaller or equal to the specified number and is equal to an integer.
For
Syntax:
For variable = value1 To value2 [Step interval]
...
Next
If the iterator variable was not declared before it will be of type Int.

Or:
For Each variable As type In collection
...
Next
Examples:
For i = 1 To 10
Log(i) 'Will print 1 to 10 (inclusive).
Next
For Each n As Int In Numbers 'an array
Sum = Sum + n
Next

Note that the loop limits will only be calculated once before the first iteration.
GetDeviceLayoutValues As LayoutValues
Returns the device LayoutValues.

Example:
Log(GetDeviceLayoutValues)
GetType (object As Object) As String
Returns a string representing the object's java type.
If
Single line:
If condition Then true-statement [Else false-statement]
Multiline:
If condition Then
statement
Else If condition Then
statement
...
Else
statement
End If
InputList (Items As List, Title As CharSequence, CheckedItem As Int) As Int
Shows a modal dialog with a list of items and radio buttons. Pressing on an item will close the dialog.
Returns the index of the selected item or DialogResponse.Cancel if the user pressed on the back key.
It is recommended to use InputListAsync instead.
List - Items to display.
Title - Dialog title.
CheckedItem - The index of the item that will first be selected. Pass -1 if no item should be preselected.
InputListAsync (Items As List, Title As CharSequence, CheckedItem As Int, Cancelable As Boolean) As Object
Shows a non-modal dialog with a list of items and radio buttons. Pressing on an item will close the dialog.
Returns the index of the selected item or DialogResponse.Cancel if the user pressed on the back key.
The InputList_Result event will be raised with the result.
List - Items to display.
Title - Dialog title.
CheckedItem - The index of the item that will first be selected. Pass -1 if no item should be preselected.
Cancelable - If true then the dialog can be canceled by clicking on the back key or outside the dialog.
The object returned can be used as the Sender Filter parameter of Wait For.
Example:
Dim options As List = Array("Red", "Green", "Blue")
InputListAsync(options, "Select Color", 0, False)
Wait For InputList_Result (Index As Int)
If Index <> DialogResponse.CANCEL Then
  Log("Selected color: " & options.Get(Index))
End If
InputMap (Items As Map, Title As CharSequence)
Shows a modal dialog with a list of items and checkboxes. The user can select multiple items.
The dialog is closed by pressing on the "Ok" button. The InputMap_Result event will be raised.
It is recommended to use InputMapAsync instead.
The items displayed are the map keys. Items with a value of True will be checked.
When the user checks or unchecks an item, the related item value gets updated.
Items - A map object with the items as keys and their checked state as values.
InputMapAsync (Items As Map, Title As CharSequence, Cancelable As Boolean) As Object
Shows a non-modal dialog with a list of items and checkboxes. The user can select multiple items.
The dialog is closed by pressing on the "Ok" button.
The object returned can be used as the Sender Filter parameter of Wait For.
The items displayed are the map keys. Items with a value of True will be checked.
When the user checks or unchecks an item, the related item value gets updated.
Items - A map object with the items as keys and their checked state as values.
Cancelable - If true then the dialog can be closed by clicking on the back key or outside the dialog (the changes will not be canceled).
Example:
Dim m As Map = CreateMap("Item #1": True, "Item #2": True, "Item #3": False)
InputMapAsync(m, "Select items", True)
Wait For InputMap_Result
Log(m)
InputMultiList (Items As List, Title As CharSequence) As List
Shows a modal dialog with a list of items and checkboxes. The user can select multiple items.
The dialog is closed by pressing on the "Ok" button.
Returns a list with the indices of the selected items. The list is sorted.
Returns an empty list if the user has pressed on the back key.
Is
Tests whether the object is of the given type.
Example:
For i = 0 To Activity.NumberOfViews - 1
If Activity.GetView(i) Is Button Then
Dim b As Button
b = Activity.GetView(i)
b.Color = Colors.Blue
End If
Next
IsBackgroundTaskRunning (ContainerObject As Object, TaskId As Int) As Boolean
Tests whether a background task, submitted by the container object and with the specified id, is running.
IsDevTool (ToolName As String) As Boolean
Returns true if ToolName equals B4A.
IsNumber (Text As String) As Boolean
Tests whether the specified string can be safely parsed as a number.
IsPaused (Component As Object) As Boolean
Tests whether the given component is paused. Will also return true for components that were not started yet.
Example:
If IsPaused(Main) = False Then CallSub(Main, "RefreshData")
LastException As Exception
Returns the last exception that was caught (if such exists).
LoadBitmap (Dir As String, FileName As String) As Bitmap
Loads the bitmap.
Note that the Android file system is case sensitive.
You should consider using LoadBitmapSample if the image size is large.
The actual file size is not relevant as images are usually stored compressed.
Example:
Activity.SetBackgroundImage(LoadBitmap(File.DirAssets, "SomeFile.jpg"))
LoadBitmapResize (Dir As String, FileName As String, Width As Int, Height As Int, KeepAspectRatio As Boolean) As Bitmap
Loads the bitmap and sets its size.
The bitmap scale will be the same as the device scale.
Unlike LoadBitmapSample which requires the container Gravity to be set to FILL, LoadBitmapResize provides better results when the Gravity is set to CENTER.
Example:
Dim bd As BitmapDrawable = Activity.SetBackgroundImage(LoadBitmapResize(File.DirAssets, "SomeFile.jpg", 100%x, 100%y, True))
bd.Gravity = Gravity.CENTER

Or:
Activity.SetBackgroundImage(LoadBitmapResize(File.DirAssets, "SomeFile.jpg", 100%x, 100%y, True)).Gravity = Gravity.CENTER
LoadBitmapSample (Dir As String, FileName As String, MaxWidth As Int, MaxHeight As Int) As Bitmap
Loads the bitmap.
The decoder will subsample the bitmap if MaxWidth or MaxHeight are smaller than the bitmap dimensions.
This can save a lot of memory when loading large images.
In most cases it is better to use LoadBitmapResize.
Example:
Activity.SetBackgroundImage(LoadBitmapSample(File.DirAssets, "SomeFile.jpg", Activity.Width, Activity.Height))
Log (Message As String)
Logs a message. The log can be viewed in the Logs tab.
Logarithm (Number As Double, Base As Double) As Double
LogColor (Message As String, Color As Int)
Logs a message. The message will be displayed in the IDE with the specified color.
Max (Number1 As Double, Number2 As Double) As Double
Returns the larger number between the two numbers.
Me As Object
For classes: returns a reference to the current instance.
For activities and services: returns a reference to an object that can be used with CallSub, CallSubDelayed and SubExists keywords.
Cannot be used in code modules.
Min (Number1 As Double, Number2 As Double) As Double
Returns the smaller number between the two numbers.
Msgbox (Message As CharSequence, Title As CharSequence)
Shows a modal message box with the specified message and title.
The dialog will show one OK button.
It is recommended to use MsgboxAsync instead.
Note that services cannot show dialogs.
Example:
Msgbox("Hello world", "This is the title")
Msgbox2 (Message As CharSequence, Title As CharSequence, Positive As String, Cancel As String, Negative As String, Icon As android.graphics.Bitmap) As Int
Shows a modal message box with the specified message and title.
It is recommended to use Msgbox2Async instead.
Message - The dialog message.
Title - The dialog title.
Positive - The text to show for the "positive" button. Pass "" to hide the button.
Cancel - The text to show for the "cancel" button. Pass "" to hide the button.
Negative - The text to show for the "negative" button. Pass "" to hide the button.
Icon - A bitmap that will be drawn near the title. Pass Null to hide hide the icon.
Returns one of the DialogResponse values.
Example:
Dim result As Int
result = Msgbox2("This is the message", "This is the title", "Good", "", "Bad", LoadBitmap(File.DirAssets, "smiley.gif"))
If result = DialogResponse.Positive Then ...
Msgbox2Async (Message As CharSequence, Title As CharSequence, Positive As String, Cancel As String, Negative As String, Icon As Bitmap, Cancelable As Boolean) As Object
Shows a non-modal message box with the specified message and title. The Msgbox_Result event will be raised with the result.
Message - The dialog message.
Title - The dialog title.
Positive - The text to show for the "positive" button. Pass "" to hide the button.
Cancel - The text to show for the "cancel" button. Pass "" to hide the button.
Negative - The text to show for the "negative" button. Pass "" to hide the button.
Icon - A bitmap that will be drawn near the title. Pass Null to hide hide the icon.
Cancelable - If true then the dialog can be canceled by clicking on the back key or outside the dialog.
The object returned can be used as the Sender Filter parameter of Wait For.
Example:
Msgbox2Async("Question?", "Title", "Yes", "Cancel", "No", Null, False)
Wait For Msgbox_Result (Result As Int)
If Result = DialogResponse.POSITIVE Then
  '...
End If
MsgboxAsync (Message As CharSequence, Title As CharSequence)
Shows a non-modal message box with the specified message and title.
The dialog will show one OK button.
Note that services cannot show dialogs.
You can use Wait For to wait for the Msgbox_Result event if you want to continue the code flow after the dialog is dismissed.
Example:
MsgboxAsync("Hello world", "This is the title")
Not (Value As Boolean) As Boolean
Inverts the value of the given boolean.
Null As Object
NumberFormat (Number As Double, MinimumIntegers As Int, MaximumFractions As Int) As String
Converts the specified number to a string.
The string will include at least Minimum Integers and at most Maximum Fractions digits.
Example:
Log(NumberFormat(12345.6789, 0, 2)) '"12,345.68"
Log(NumberFormat(1, 3 ,0)) '"001"
NumberFormat2 (Number As Double, MinimumIntegers As Int, MaximumFractions As Int, MinimumFractions As Int, GroupingUsed As Boolean) As String
Converts the specified number to a string.
The string will include at least Minimum Integers, at most Maximum Fractions digits and at least Minimum Fractions digits.
GroupingUsed - Determines whether to group every three integers.
Example:
Log(NumberFormat2(12345.67, 0, 3, 3, false)) '"12345.670"
PerXToCurrent (Percentage As Float) As Int
Returns the actual size of the given percentage of the activity width.
Example:
Button1.Width = PerXToCurrent(50) 'Button1.Width = 50% * Activity.Width

A shorthand syntax for this method is available. Any number followed by the string '%x'
will be converted in the same manner (no spaces are allowed between the number and '%x').
So the previous code is equivalent to:
Button1.Width = 50%x
PerYToCurrent (Percentage As Float) As Int
Returns the actual size of the given percentage of the activity height.
Example:
Button1.Height = PerYToCurrent(50) 'Button1.Height = 50% * Activity.Height

A shorthand syntax for this method is available. Any number followed by the string '%y'
will be converted in the same manner (no spaces are allowed between the number and '%y').
So the previous code is equivalent to:
Button1.Height = 50%y
Power (Base As Double, Exponent As Double) As Double
Returns the Base value raised to the Exponent power.
ProgressDialogHide
Hides a visible progress dialog. Does not do anything if no progress dialog is visible.
ProgressDialogShow (Text As CharSequence)
Shows a dialog with a circular spinning bar and the specified text.
Unlike Msgbox and InputList methods, the code will not block.
You should call ProgressDialogHide to remove the dialog.
The dialog will also be removed if the user presses on the Back key.
ProgressDialogShow2 (Text As CharSequence, Cancelable As Boolean)
Shows a dialog with a circular spinning bar and the specified text.
Unlike Msgbox and InputList methods, the code will not block.
You should call ProgressDialogHide to remove the dialog.
Cancelable - Whether the user can dismiss the dialog by pressing on the Back key.
QUOTE As String
Quote character. The value of Chr(34).
Regex As Regex
Regular expressions related methods.
Return
Returns from the current sub and optionally returns the given value.
Syntax: Return [value]
Rnd (Min As Int, Max As Int) As Int
Returns a random integer between Min (inclusive) and Max (exclusive).
RndSeed (Seed As Long)
Sets the random seed value.
This method can be used for debugging as it allows you to get the same results each time.
Round (Number As Double) As Long
Returns the closest long number to the given number.
Round2 (Number As Double, DecimalPlaces As Int) As Double
Rounds the given number and leaves up to the specified number of fractional digits.
Select
Compares a single value to multiple values.
Example:
Dim value As Int
value = 7
Select value
  Case 1
    Log("One")
  Case 2, 4, 6, 8
    Log("Even")
  Case 3, 5, 7, 9
    Log("Odd larger than one")
  Case Else
    Log("Larger than 9")
End Select
Sender As Object
Returns the object that raised the event.
Only valid while inside the event sub.
Example:
Sub Button_Click
Dim b As Button
b = Sender
b.Text = "I've been clicked"
End Sub
Sin (Radians As Double) As Double
Calculates the trigonometric sine function. Angle measured in radians.
SinD (Degrees As Double) As Double
Calculates the trigonometric sine function. Angle measured in degrees.
Sleep (Milliseconds As Int)
Pauses the current sub execution and resumes it after the specified time.
SmartStringFormatter (Format As String, Value As Object) As String
Internal keyword used by the Smart String literal.
Sqrt (Value As Double) As Double
Returns the positive square root.
StartActivity (Activity As Object)
Starts an activity or brings it to front if it already exists.
The target activity will be started once the program is free to process its message queue.
Activity can be a string with the target activity name or it can be the actual activity.
After this call the current activity will be paused and the target activity will be resumed.
This method can also be used to send Intents objects to the system.
Note that you should usually not call StartActivity from a Service.
Example: StartActivity (Activity2)
StartService (Service As Object)
Starts the given service. The service will be first created if it was not started before.
The target service will be started once the program is free to process its message queue.
Note that you cannot show a Msgbox after this call and before the service starts.
Service - The service module or the service name.
Example:
StartService(SQLService)
StartServiceAt (Service As Object, Time As Long, DuringSleep As Boolean)
Schedules the given service to start at the given time.
Service - The service module or service name. Pass an empty string when calling from a service module that schedules itself.
Time - The time to start the service. If this time has already past the service will be started now.
DuringSleep - Whether to start the service when the device is sleeping. If set to false and the device is sleeping
at the specified time, the service will be started when the device wakes up.
StartServiceAt can be used to schedule a repeating task. You should call it under Service_Start to schedule the next task.
This call cancels previous scheduled tasks (for the same service).
Example:
StartServiceAt(SQLService, DateTime.Now + 30 * 1000, false) 'will start after 30 seconds.
StartServiceAtExact (Service As Object, Time As Long, DuringSleep As Boolean)
Same as StartServiceAt for Android versions up to 4.3 (API 18).
On Android 4.4+ it forces the OS to start the service at the exact time. This method will have a larger impact on the battery compared
to StartServiceAt.
StopService (Service As Object)
Stops the given service. Service_Destroy will be called. Call StartService afterwards will first create the service.
Service - The service module or service name. Pass empty string to stop the current service (from the service module).
Example:
StopService(SQLService)
Sub
Declares a sub with the parameters and return type.
Syntax: Sub name [(list of parameters)] [As return-type]
Parameters include name and type.
The lengths of arrays dimensions should not be included.
Example:
Sub MySub (FirstName As String, LastName As String, Age As Int, OtherValues() As Double) As Boolean
...
End Sub

In this example OtherValues is a single dimension array.
The return type declaration is different than other declarations as the array parenthesis follow the type and not
the name (which does not exist in this case).
SubExists (Object As Object, Sub As String) As Boolean
Tests whether the object includes the specified method.
Returns false if the object was not initialized or not an instance of a user class.
TAB As String
Tab character.
Tan (Radians As Double) As Double
Calculates the trigonometric tangent function. Angle measured in radians.
TanD (Degrees As Double) As Double
Calculates the trigonometric tangent function. Angle measured in degrees.
ToastMessageShow (Message As CharSequence, LongDuration As Boolean)
Shows a quick little message that goes out automatically.
Message - The text message to show.
LongDuration - If true then shows the message for a long period, otherwise shows the message for a short period.
True As Boolean
Try
Any exception thrown inside a try block will be caught in the catch block.
Call LastException to get the caught exception.
Syntax:
Try
...
Catch
...
End Try
Type
Declares a structure.
Can only be used inside sub Globals or sub Process_Globals.
Syntax:
Type type-name (field1, field2, ...)
Fields include name and type.
Example:
Type MyType (Name As String, Items(10) As Int)
Dim a, b As MyType
a.Initialize
a.Items(2) = 123
Until
Loops until the condition is true.
Syntax:
Do Until condition
...
Loop
While
Loops while the condition is true.
Syntax:
Do While condition
...
Loop

LayoutValues

Holds values related to the display.
You can get the values of the the current display by calling GetDeviceLayoutValues.
For example:
Dim lv As LayoutValues
lv = GetDeviceLayoutValues
Log(lv) 'will print the values to the log

Activity.LoadLayout and Panel.LoadLayout return a LayoutValues object with the values of the
chosen layout variant.

Events:

None

Members:


  ApproximateScreenSize As Double [read only]

  Height As Int

  Scale As Float

  toString As String

  Width As Int

Members description:

ApproximateScreenSize As Double [read only]
Returns the approximate screen size.
Height As Int
The display height (pixels).
Scale As Float
The device scale value which is equal to 'dots per inch' / 160.
toString As String
Width As Int
The display width (pixels).

Notification

A status bar notification. The user can open the notifications screen and press on the notification.
Pressing on the notification will start an activity as set by the notification object.
Notifications are usually used by services as services are not expected to directly start activities.
The notification must have an icon and its "info" must be set.
Example:
Dim n As Notification
n.Initialize
n.Icon = "icon"
n.SetInfo("This is the title", "and this is the body.", Main) 'Change Main to "" if this code is in the main module.
n.Notify(1)

Permissions:

android.permission.VIBRATE

Events:

None

Members:


  AutoCancel As Boolean [write only]

  Cancel (Id As Int)

  Icon As String [write only]

  Initialize

  Insistent As Boolean [write only]

  IsInitialized As Boolean

  Light As Boolean [write only]

  Notify (Id As Int)

  Number As Int

  OnGoingEvent As Boolean [write only]

  SetInfo (Title As String, Body As String, Activity As Object)

  SetInfo2 (Title As String, Body As String, Tag As String, Activity As Object)

  Sound As Boolean [write only]

  Vibrate As Boolean [write only]

Members description:

AutoCancel As Boolean [write only]
Sets whether the notification will be canceled automatically when the user clicks on it.
Cancel (Id As Int)
Cancels the notification with the given Id.
Icon As String [write only]
Sets the icon displayed.
The icon value is the name of the image file without the extension. The name is case sensitive.
The image file should be manually copied to the following folder: source folder\Objects\res\drawable.

You can use "icon" to use the application icon (which is also located in this folder):
n.Icon = "icon"
Initialize
Initializes the notification. By default the notification plays a sound, shows a light and vibrates the phone.
Insistent As Boolean [write only]
Sets whether the sound will play repeatedly until the user opens the notifications screen.
IsInitialized As Boolean
Light As Boolean [write only]
Sets whether the notification will show a light.
Example:
n.Light = False
Notify (Id As Int)
Displays the notification.
Id - The notification id. This id can be used to later update this notification (by calling Notify again with the same Id),
or to cancel the notification.
Number As Int
Gets or sets a number that will be displayed on the icon. This is useful to represent multiple events in a single notification.
OnGoingEvent As Boolean [write only]
Sets whether this notification is an "ongoing event". The notification will be displayed in the ongoing section
and it will not be cleared.
SetInfo (Title As String, Body As String, Activity As Object)
Sets the message text and action.
Title - The message title.
Body - The message body.
Activity - The activity to start when the user presses on the notification.
Pass an empty string to start the current activity (when calling from an activity module).
Example:
n.SetInfo("Some title", "Some text", Main)
SetInfo2 (Title As String, Body As String, Tag As String, Activity As Object)
Similar to SetInfo. Also sets a string that can be later extracted in Activity_Resume.
Title - The message title.
Body - The message body.
Tag - An arbitrary string that can be later extract when the user clicks on the notification.
Activity - The activity to start when the user presses on the notification.
Pass an empty string to start the current activity (when calling from an activity module).
Example of extracting the tag:
Sub Activity_Resume
  Dim in As Intent
  in = Activity.GetStartingIntent
  If in.HasExtra("Notification_Tag") Then
    Log(in.GetExtra("Notification_Tag")) 'Will log the tag
  End If
End Sub
Sound As Boolean [write only]
Sets whether the notification will play a sound.
Example:
n.Sound = False
Vibrate As Boolean [write only]
Sets whether the notification will vibrate.
Example:
n.Vibrate = False

RemoteViews

RemoteViews allows indirect access to a home screen widget.
See this tutorial for more information Widgets tutorial.

Events:

RequestUpdate
Disabled

Members:


  HandleWidgetEvents (StartingIntent As android.content.Intent) As Boolean

  SetImage (ImageViewName As String, Image As android.graphics.Bitmap)

  SetProgress (ProgressBarName As String, Progress As Int)

  SetText (ViewName As String, Text As CharSequence)

  SetTextColor (ViewName As String, Color As Int)

  SetTextSize (ViewName As String, Size As Float)

  SetVisible (ViewName As String, Visible As Boolean)

  UpdateWidget

Members description:

HandleWidgetEvents (StartingIntent As android.content.Intent) As Boolean
Checks if the intent starting this service was sent from the widget and raises events based on the intent.
Returns True if an event was raised.
SetImage (ImageViewName As String, Image As android.graphics.Bitmap)
Sets the image of the given ImageView.
Example:rv.SetImage("ImageView1", LoadBitmap(File.DirAssets, "1.jpg"))
SetProgress (ProgressBarName As String, Progress As Int)
Sets the progress value of the given ProgressBar. Value should be between 0 to 100.
Example:rv.SetProgress("ProgressBar1", 50)
SetText (ViewName As String, Text As CharSequence)
Sets the text of the given view.
Example:rv.SetText("Label1", "New text")
SetTextColor (ViewName As String, Color As Int)
Sets the text color of the given button or label.
Example:rv.SetTextColor("Label1", Colors.Red)
SetTextSize (ViewName As String, Size As Float)
Sets the text size of the given button or label.
Example:rv.SetTextSize("Label1", 20)
SetVisible (ViewName As String, Visible As Boolean)
Sets the visibility of the given view.
Example:rv.SetVisibile("Button1", False)
UpdateWidget
Updates the widget with the changes done. This method is also responsible for configuring the events.

ResumableSub

This object is returned from a call to a non-void resumable sub.
You can use it as the sender filter parameter and wait for the Complete event.

Events:

None

Members:


  Completed As Boolean [read only]

  IsInitialized As Boolean

Members description:

Completed As Boolean [read only]
Tests whether the resumable sub has already completed.
IsInitialized As Boolean

Service

Each Service module includes a Service object.
This object is used to bring the service in and out of the foreground state.
See the Services tutorial for more information.

Events:

None

Members:


  StartForeground (Id As Int, Notification As android.app.Notification)

  StopForeground (Id As Int)

Members description:

StartForeground (Id As Int, Notification As android.app.Notification)
Brings the current service to the foreground state and displays the given notification.
Id - The notification Id (see the notification object documentation).
Notification - The notification that will be displayed.
StopForeground (Id As Int)
Takes the current service out of the foreground state and cancels the notification with the given Id.

String

Strings are immutable in Basic4android, which means that you can change the value of a string variable but you cannot change the text stored in a string object.
So methods like SubString, Trim and ToLowerCase return a new string, they do not change the value of the current string.
Typical usage:
Dim s As String
s = "some text"
s = s.Replace("a", "b")

You can use StringBuilder if you need a mutable string.
Note that string literals are also string objects:
Log(" some text ".Trim)

Events:

None

Members:


  CharAt (Index As Int) As Char

  CompareTo (Other As String) As Int

  Contains (SearchFor As String) As Boolean

  EndsWith (Suffix As String) As Boolean

  EqualsIgnoreCase (other As String) As Boolean

  GetBytes (Charset As String) As Byte()

  IndexOf (SearchFor As String) As Int

  IndexOf2 (SearchFor As String, Index As Int) As Int

  LastIndexOf (SearchFor As String) As Int

  LastIndexOf2 (SearchFor As String, Index As Int) As Int

  Length As Int

  Replace (Target As String, Replacement As String) As String

  StartsWith (Prefix As String) As Boolean

  SubString (BeginIndex As Int) As String

  SubString2 (BeginIndex As Int, EndIndex As Int) As String

  ToLowerCase As String

  ToUpperCase As String

  Trim As String

Members description:

CharAt (Index As Int) As Char
Returns the character at the given index.
CompareTo (Other As String) As Int
Lexicographically compares the two strings.
Returns a value less than 0 if the current string precedes Other.
Returns 0 if both strings are equal.
Returns a value larger than 0 if the current string comes after Other.
Note that upper case characters precede lower case characters.

Examples:
"abc".CompareTo("da") ' < 0
"abc".CompareTo("Abc") ' > 0
"abc".CompareTo("abca")' < 0
Contains (SearchFor As String) As Boolean
Tests whether the string contains the given string parameter.
EndsWith (Suffix As String) As Boolean
Returns true if this string ends with the given Suffix.
EqualsIgnoreCase (other As String) As Boolean
Returns true if both strings are equal ignoring their case.
GetBytes (Charset As String) As Byte()
Encodes the string into a new array of bytes.
Example:
Dim Data() As Byte
Data = "Some string".GetBytes("UTF8")
IndexOf (SearchFor As String) As Int
Returns the index of the first occurrence of SearchFor string in the string.
Returns -1 if SearchFor was not found.
IndexOf2 (SearchFor As String, Index As Int) As Int
Returns the index of the first occurrence of SearchFor string in the string.
Starts searching from the given Index.
Returns -1 if SearchFor was not found.
LastIndexOf (SearchFor As String) As Int
Returns the index of the first occurrence of SearchFor string in the string.
The search starts at the end of the string and advances to the beginning.
LastIndexOf2 (SearchFor As String, Index As Int) As Int
Returns the index of the first occurrence of SearchFor string in the string.
The search starts at the given index and advances to the beginning.
Length As Int
Returns the length of this string.
Replace (Target As String, Replacement As String) As String
Returns a new string resulting from the replacement of all the occurrences of Target with Replacement.
StartsWith (Prefix As String) As Boolean
Returns true if this string starts with the given Prefix.
SubString (BeginIndex As Int) As String
Returns a new string which is a substring of the original string.
The new string will include the character at BeginIndex and will extend to the end of the string.

Example:
"012345".SubString(2) 'returns "2345"
SubString2 (BeginIndex As Int, EndIndex As Int) As String
Returns a new string which is a substring of the original string.
The new string will include the character at BeginIndex and will extend to the character at EndIndex, not including the last character.

Example:
"012345".SubString2(2, 4) 'returns "23"
ToLowerCase As String
Returns a new string which is the result of lower casing this string.
ToUpperCase As String
Returns a new string which is the result of upper casing this string.
Trim As String
Returns a copy of the original string without any leading or trailing white spaces.

StringBuilder

StringBuilder is a mutable string, unlike regular strings which are immutable.
StringBuilder is especially useful when you need to concatenate many strings.
The following code demonstrates the performance boosting of StringBuilder:
Dim start As Long
start = DateTime.Now
'Regular string
Dim s As String
For i = 1 To 5000
  s = s & i
Next
Log(DateTime.Now - start)
'StringBuilder
start = DateTime.Now
Dim sb As StringBuilder
sb.Initialize
For i = 1 To 5000
  sb.Append(i)
Next
Log(DateTime.Now - start)

Tested on a real device, the first 'for loop' took about 20 seconds and the second took less then tenth of a second.
The reason is that the code: s = s & i creates a new string each iteration (strings are immutable).
The method StringBuilder.ToString converts the object to a string.

Events:

None

Members:


  Append (Text As String) As StringBuilder

  Initialize

  Insert (Offset As Int, Text As String) As StringBuilder

  IsInitialized As Boolean

  Length As Int [read only]

  Remove (StartOffset As Int, EndOffset As Int) As StringBuilder

  ToString As String

Members description:

Append (Text As String) As StringBuilder
Appends the specified text at the end.
Returns the same object, so you can chain methods.
Example:
sb.Append("First line").Append(CRLF).Append("Second line")
Initialize
Initializes the object.
Example:
Dim sb As StringBuilder
sb.Initialize
sb.Append("The value is: ").Append(SomeOtherVariable).Append(CRLF)
Insert (Offset As Int, Text As String) As StringBuilder
Inserts the specified text at the specified offset.
IsInitialized As Boolean
Length As Int [read only]
Returns the number of characters.
Remove (StartOffset As Int, EndOffset As Int) As StringBuilder
Removes the specified characters.
StartOffset - The first character to remove.
EndOffset - The ending index. This character will not be removed.
ToString As String
Converts the object to a string.

Timer

A Timer object generates ticks events at specified intervals.
Using a timer is a good alternative to a long loop, as it allows the UI thread to handle other events and messages.
Note that the timer events will not fire while the UI thread is busy running other code.
The timer Enabled property is set to False by default. To make it start working you should change it to True.
Timer events will not fire when the activity is paused, or if a blocking dialog (like Msgbox) is visible.
Timers should be declared in Sub Process_Globals. Otherwise you may get multiple timers running when the activity is recreated.
It is also important to disable the timer when the activity is pausing and then enable it when it resumes. This will save CPU and battery.

Events:

Tick

Members:


  Enabled As Boolean

  Initialize (EventName As String, Interval As Long)

  Interval As Long

  IsInitialized As Boolean

Members description:

Enabled As Boolean
Gets or sets whether the timer is enabled (ticking).
Initialize (EventName As String, Interval As Long)
Initializes the timer with the event sub prefix and the specified interval (measured in milliseconds).
IMPORTANT: this object should be declared in Sub Process_Globals.
Example:
Timer1.Initialize("Timer1", 1000)
Timer1.Enabled = True

Sub Timer1_Tick
'Handle tick events
End Sub
Interval As Long
Gets or sets the interval between tick events, measured in milliseconds.
IsInitialized As Boolean

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