Intent Output

DataWedge 7.3

Overview

Intent Output allows data acquired and processed by DataWedge to be sent to the associated foreground application as payload within an Android intent object. This allows acquired data to be passed programmatically to an application, where it can be consumed or further processed. The core components of an application (its activities, services and broadcast receivers) also can be activated by intents, as can many DataWedge features through the DataWedge APIs.

The Intent Object

An intent object is a bundle of information that describes a desired action. It includes the data to be acted upon, the category of component that should perform the action and other pertinent data and/or instructions. When an intent is initiated, Android locates an appropriate component to respond to the intent, launches a new instance of the component (if needed), and passes the intent object to it.

Components advertise their capabilities (the kinds of intents they can respond to) through intent filters. Since the system must learn which intents a component can handle before it launches the component, intent filters are specified in the app's AndroidManifest.xml file as <intent-filter> elements. A component can have any number of intent filters, each describing a different capability.

For example, if the manifest contains...

<intent-filter>
...
<action android:name="android.intent.action.DEFAULT" />
<category android:name="android.intent.category.MAIN" />
</intent-filter>

...the intent action in the Intent Output configuration would be:

android.intent.category.DEFAULT

and the Intent category would be:

android.intent.category.MAIN


SEE ALSO:


Outputting Raw Data

In addition to its normal plain-text and hexadecimal modes, DataWedge can output acquired data in its raw form, before the application of any encoders. This can be useful if custom encoders are needed for acquiring character sets not supported by Zebra.

Raw data is received as a byte stream using the com.symbol.datawedge.decode_data intent extra. See the Single Decode Mode section below.

Raw data cannot be output as keystrokes.


Intent Output Setup

DataWedge invokes an intent though an Intent action in an Intent category as described in its AndroidManifest.xml file.

When combined, these two values are like a "channel" to which an app can listen for intents that use the same combination, filtering out "noise" from other intents that use different value pairs. Once these values are known, DataWedge Intent Output must be set to match.

Important: For scanning applications that output directly to an activity, the activity must be designated as "singleTop" in the app's AndroidManifest.xml file. Failure to designate an activity in this way will cause an instance of the activity to be launched with every decode, and the acquired data sent to each newly spawned instance.

The parameters of this feature can be configured through the UI or by using the Set Config API.


To set a DataWedge Action/Category pair:

1. Locate the Intent Output section of the Profile being configured.

2. Check "Enabled" box to activate Intent Output:
Intent Output options for the "Launcher" Profile

3. Specify action, category and delivery as described below:

Intent action - specifies the action to handle the intent

Intent category - specifies the category of intent to be handled

Intent delivery - used to select one of four delivery methods for intent-based data:

  • Send via startActivity
  • Send via startService
  • Send via startForegroundService
  • Broadcast Intent

When Intent delivery is set to "Broadcast Intent", DataWedge sets the Receiver foreground flag Intent.FLAG_RECEIVER_FOREGROUND in the broadcast Intent, giving the broadcast recipient permission to run at foreground priority with a shorter timeout interval. Zebra recommends using this flag only if delays are seen in delivery of intents immediately following device boot-up.

When Intent delivery is set to "Send via startForegroundService", startForegroundService() Android API is called to deliver data. This option applies to Android Oreo (v8.0) and above.

When Intent delivery is set to "Send via startService", startService() Android API is called to deliver data for devices prior to Android Oreo (v8.0). For Android Oreo and above devices, the option "Use startForegroundService on failure" is available within this setting to call startForegroundService() if the startService() call fails. With this single option, it provides support for devices both prior and later than Android Oreo.


Single Decode Mode

Single mode reads and decodes a single barcode at a time, and is the most common decoding mode. For decoding multiple barcodes simultaneously, such as with UDI-compliant objects, see UDI/Multiple Decode Mode.

Parameters

Name: "com.symbol.datawedge.source"
Type: [String]
Contents: Source of incoming data
Possible values:

  • "msr"
  • "scanner"
  • "simulscan"

NOTE: Source of incoming data is "scanner" for camera, imager or scanner.


Name: "com.symbol.datawedge.label_type"
Type: [String]
Contents: Barcode label type (i.e. "EAN128")


Name: "com.symbol.datawedge.data_string"
Type: [String]
Contents: Acquired barcode characters
Example: "abcde12345"


Name: "com.symbol.datawedge.decode_data"
Type: [List <byte [ ]>]
Contents: Acquired raw (unmodified) data as an array list of byte arrays
Example: List_Item_1(array_1(byte11,byte12,byte13)),List_Item_2(array_2(byte21,byte22,byte23)) ...
Sample code:

ArrayList<byte[]> rawData =  
     (ArrayList <byte[]>) initiatingIntent.getSerializableExtra("com.symbol.datawedge.decode_data"); 

if (rawData != null) 
{ 
    byte[] rawBytes = rawData.get(0); 
    for (int i = 0; i < rawBytes.length; i++) 
        Log.d(LOG_TAG, i + ": " + rawBytes[i]); 
}

Name: "com.symbol.datawedge.decoded_mode"
Type: [String]
Contents: Mode used to decode the incoming data
Possible values:

  • "multiple_decode"
  • "single_decode"

UDI/Multiple Decode Mode

When decoding a UDI-compliant object, data is acquired from multiple barcodes simultaneously and output as a multi-decode bundle, which differs from a single-decode bundle. DataWedge also can acquire multiple non-UDI barcodes in a single scan. This section applies to both modes.

Parameters

Name: "com.symbol.datawedge.decode_mode"
Type: [String]
Contents: Mode used to decode incoming data
Possible values:

  • "multiple_decode"
  • "single_decode"

Name: "com.symbol.datawedge.smart_decode_type"
Type: [String]
Contents: Decode type
Possible values:

  • “udi”
  • “multibarcode”

Name: "com.symbol.datawedge.data_string"
Type: [String]
Contents: Acquired barcode characters
Example: "abcde12345"


Name: "com.symbol.datawedge.decode_data"
Type: [List <byte [ ]>]
Contents: Acquired raw (unmodified) data as an array list of byte arrays
Example: List_Item_1(array_1(byte11,byte12,byte13)), List_Item_2(array_2(byte21,byte22,byte23)) ...


Name: "com.symbol.datawedge.source"
Type: [String]
Contents: Source of incoming data
Possible values:

  • "msr"
  • "scanner"
  • "simulscan"

Name: "com.symbol.datawedge.label_id"
Type: [String]
Contents: UDI type of incoming data
Possible values:

  • “UDI_HIBCC”
  • “UDI_GS1”
  • “UDI_ICCBBA”
  • “UNDEFINED”

Name: "com.symbol.datawedge.barcodes"
Type: [List <Bundle>]
Contents: See Bundle description (below)


Name: "com.symbol.datawedge.tokenized_data"
Type: [List <Bundle>]
Contents: See Bundle description (below)
Note: Source of incoming data is "scanner" for camera, imager or scanner


Barcode Bundle

Bundle name: "com.symbol.datawedge.barcodes"

Parameters

Name: "com.symbol.datawedge.label_type"
Type: [String]
Contents: Barcode label type, original symbology (i.e. "EAN128")


Name: "com.symbol.datawedge.decode_data"
Type: [byte [ ] ]
Contents: Acquired raw (unmodified) data as a byte array


Name: "com.symbol.datawedge.data_string"
Type: [String]
Contents: Acquired barcode characters
Example: "abcde12345"


Tokenized Data Bundle

Bundle name: "com.symbol.datawedge.tokenized_data"

Parameters

Name: "token_id"
Type: [String]
Contents: Data in a UDI-defined tag
Possible values: (see token IDs, below)


Name: "token_data_type"
Type: [String]
Contents: Incoming data type
Example: date, long, string


Name: "token_format"
Type: [String]
Contents: Format of incoming string
Example: YYYYMMDD


Name: "token_string_data"
Type: [String]
Contents: Acquired barcode characters
Example: "abcde12345"


Name: "token_binary_data"
Type: [byte [ ] ]
Contents: Acquired barcode data as a byte array


Token IDs

Token ID: di
Display Name: Device identifier


Token ID: manufacturing_date_original
Display Name: Manufacturing date


Token ID: expiration_date_original
Display Name: Expiration date


Token ID: lot_number
Display Name: Lot number


Token ID: serial_number
Display Name: Serial number


Token ID: mpho_lot_number
Display Name: Medical products of human origin (MPHO) lot number


Token ID: donation_id
Display Name: Donation ID number


Token ID: labeler_identification_code
Display Name: Labeler ID code


Token ID: product_or_catalog_number
Display Name: Product or catalog number


Token ID: unit_of_measure_id
Display Name: Unit of measure ID


Token ID: Quantity
Display Name: Quantity


Other Decode Tags

The decode-related data added to an intent bundle can be retrieved using specific string tags. Use the JavaScript call below with the string tags in the section that follows.


Intent.getStringtExtra()

Tag: LABEL_TYPE_TAG
Type: [String]
Name: "com.symbol.datawedge.label_type"
Contents: Barcode label type
Example: "LABEL-TYPE-EAN128"


Tag: DATA_STRING_TAG
Type: [String]
Name: "com.symbol.datawedge.data_string"
Contents: Acquired barcode characters
Example: "abcde12345"

Note: When multiple barcodes are acquired simultaneously, the decoded data is concatenated and sent out as a single string.


Tag: DECODE_DATA_TAG
Type: [byte [ ] ]
Name: "com.symbol.datawedge.decode_data"
Contents: Decoded data returned as a list of byte arrays.

Note: In most cases there will be one byte array per decode.


SEE ALSO:


Other DataWedge Output Options:

  • Keystroke - outputs acquired data as if the keyboard was pressed
  • Internet Protocol - outputs data over a network using TCP or UDP

Related guides: