GetExtra

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leongcc

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I use the same key for HasExtra() and GetExtra().
HasExtra() retuens True but GetExtra() returns null, that is MacObject is null.
Any advice?


B4X: 
Sub BroadCastReceiver_OnReceive (Action As String,  i As  Object)   
    Dim  intnt As  Intent
    intnt = i
    Log(intnt)
    Log(intnt.ExtrasToString)

    Dim MacObject as Object
    If (intnt.HasExtra("android.bluetooth.device.extra.DEVICE")) Then
         MacObject = intnt.GetExtra("android.bluetooth.device.extra.DEVICE")
         Log ("MacObject: " & MacObject)
    End If
End Sub
 
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leongcc

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The values are not null.
The Log of the intent show both the keys and the values.
Please see the comment directly below the Log statements.
 
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leongcc

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I modified the codes to include the statement,
Log ("MacObject: " & MacObject).
The Log is as follows

B4X: 
(Intent)Intent { act=android.bluetooth.device.action.PAIRING_REQUEST fla=0x10 (has extras) }
Bundle[{android.bluetooth.device.extra.DEVICE=00:12:3E:00:16:65, android.bluetooth.device.SECURE=true, android.bluetooth.device.PAIRING_VARIANT=0}]
MacObject: null
 
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leongcc

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So HasExtra() is able to recognize the key in the Bundle but GetExtra() is not able to recognize the value that comes after, because the value is not "serializable".
Could you elaborate please?
 
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leongcc

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I am not familair with B4A Reflection, could give me an example how Reflection codes look like for Intent.getParcelableExtra()
 
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leongcc

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Thanks for you reply.
My app is already working well using B4A BluetoothAdmin and BtSerial but I have to implement a special requirement.

Using the extra value from intent, I want to create a android.bluetooth.BluetoothDevice then access an internal method, setPin(). In Java I would do this:


BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(intent.getParcelableExtra(..))
device.setPin("1234")


I am not sure about B4A Reflection but I think I need it to get this done, and there is a good chance I will mess things up by reflecting BluetoothDevice because BluetoothDevice is a thin wrapper that serves android.bluetooth.BluetoothAdapter that is managed by B4A BluetoothAdmin. Do you think so?

Aternatively, I can write all Bluetooth stuff in Java and put it in a B4A library.

I appreciate some advice.
 
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leongcc

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Just to inform that I wrote a Java class and convert it to B4A library.
Now my Android app can programmatically bond(pair) with bluetooth devices.
 
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walterf25

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Bluetooth Library

Hi there, can you share that library you created, i'm sure it will be helpful to a lot of us in here :icon_clap:


Cheers,
Walter
 
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