com.google.appinventor.components.runtime

Class BarcodeScanner

java.lang.Object

com.google.appinventor.components.runtime.AndroidNonvisibleComponent

com.google.appinventor.components.runtime.BarcodeScanner

All Implemented Interfaces:

ActivityResultListener, Component

public class BarcodeScanner
extends AndroidNonvisibleComponent
implements ActivityResultListener, Component

Component for scanning a barcode and getting back the resulting string.

Field Summary

Fields inherited from class com.google.appinventor.components.runtime.AndroidNonvisibleComponent

form

Fields inherited from interface com.google.appinventor.components.runtime.Component

ACCELEROMETER_SENSITIVITY_MODERATE, ACCELEROMETER_SENSITIVITY_STRONG, ACCELEROMETER_SENSITIVITY_WEAK, ALIGNMENT_CENTER, ALIGNMENT_NORMAL, ALIGNMENT_OPPOSITE, ASSET_DIRECTORY, BUTTON_SHAPE_DEFAULT, BUTTON_SHAPE_OVAL, BUTTON_SHAPE_RECT, BUTTON_SHAPE_ROUNDED, COLOR_BLACK, COLOR_BLUE, COLOR_CYAN, COLOR_DEFAULT, COLOR_DKGRAY, COLOR_GRAY, COLOR_GREEN, COLOR_LTGRAY, COLOR_MAGENTA, COLOR_NONE, COLOR_ORANGE, COLOR_PINK, COLOR_RED, COLOR_WHITE, COLOR_YELLOW, DEFAULT_VALUE_COLOR_BLACK, DEFAULT_VALUE_COLOR_BLUE, DEFAULT_VALUE_COLOR_CYAN, DEFAULT_VALUE_COLOR_DEFAULT, DEFAULT_VALUE_COLOR_DKGRAY, DEFAULT_VALUE_COLOR_GRAY, DEFAULT_VALUE_COLOR_GREEN, DEFAULT_VALUE_COLOR_LTGRAY, DEFAULT_VALUE_COLOR_MAGENTA, DEFAULT_VALUE_COLOR_NONE, DEFAULT_VALUE_COLOR_ORANGE, DEFAULT_VALUE_COLOR_PINK, DEFAULT_VALUE_COLOR_RED, DEFAULT_VALUE_COLOR_WHITE, DEFAULT_VALUE_COLOR_YELLOW, DIRECTION_EAST, DIRECTION_MAX, DIRECTION_MIN, DIRECTION_NONE, DIRECTION_NORTH, DIRECTION_NORTHEAST, DIRECTION_NORTHWEST, DIRECTION_SOUTH, DIRECTION_SOUTHEAST, DIRECTION_SOUTHWEST, DIRECTION_WEST, FONT_DEFAULT_SIZE, LAYOUT_ORIENTATION_HORIZONTAL, LAYOUT_ORIENTATION_VERTICAL, LENGTH_FILL_PARENT, LENGTH_PREFERRED, LENGTH_UNKNOWN, SLIDER_MAX_VALUE, SLIDER_MIN_VALUE, SLIDER_THUMB_VALUE, TOAST_LENGTH_LONG, TOAST_LENGTH_SHORT, TYPEFACE_DEFAULT, TYPEFACE_MONOSPACE, TYPEFACE_SANSSERIF, TYPEFACE_SERIF

Constructor Summary

Constructors

Constructor and Description
BarcodeScanner(ComponentContainer container) Creates a Bar Code scanning component.

Method Summary

Methods

Modifier and Type	Method and Description
void	AfterScan(java.lang.String result) Indicates that the scanner has read a (text) result and provides the result
void	DoScan() Begins a barcode scan, using the camera.
java.lang.String	Result() Result property getter method.
void	resultReturned(int requestCode, int resultCode, android.content.Intent data) The callback method used to report Activity results back to the caller.
boolean	UseExternalScanner() Gets whether or not you want to use an external scanning program to scan barcodes.
void	UseExternalScanner(boolean useExternalScanner) Set whether or not you wish to use an External Scanning program such as Bar Code Scanner.

Methods inherited from class com.google.appinventor.components.runtime.AndroidNonvisibleComponent

getDispatchDelegate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.google.appinventor.components.runtime.Component

getDispatchDelegate

Constructor Detail

BarcodeScanner

public BarcodeScanner(ComponentContainer container)

Creates a Bar Code scanning component.

Parameters:

container - container, component will be placed in

Method Detail

Result

public java.lang.String Result()

Result property getter method.

DoScan

public void DoScan()

Begins a barcode scan, using the camera. When the scan is complete, the AfterScan event will be raised.

resultReturned

public void resultReturned(int requestCode,
                  int resultCode,
                  android.content.Intent data)

Description copied from interface: ActivityResultListener

The callback method used to report Activity results back to the caller.

Specified by:

resultReturned in interface ActivityResultListener

Parameters:

requestCode - the originally passed in request code. Used to identify the call.

resultCode - the returned result code: Activity.RESULT_OK or Activity.RESULT_CANCELED

data - the returned data, encapsulated as an Intent.

AfterScan

public void AfterScan(java.lang.String result)

Indicates that the scanner has read a (text) result and provides the result

UseExternalScanner

public boolean UseExternalScanner()

Gets whether or not you want to use an external scanning program to scan barcodes.

Returns:

'true' or 'false' depending on whether or not you want to use an external scanning program.

UseExternalScanner

public void UseExternalScanner(boolean useExternalScanner)

Set whether or not you wish to use an External Scanning program such as Bar Code Scanner. If false a version of ZXing integrated into App Inventor Will be used.

Parameters:

useExternalScanner - Set true to use an external scanning program, false to use internal copy of ZXing.