-> android-platform On 15 Dez., 13:15, Narseo Vallina <[email protected]> wrote: > Hi all > > I'm working on a research project and I need to have a system service > running as an android component and one of it's features is performing > bluetooth scans in the environment. > > I have the following code to discover bluetooth devices (taken from > BluetoothChat example). I tried it as an application and it worked but > once I'm adding it as a feature of my system service it does not work. > I'm not sure if I'm declaring the intents properly or if I need to set > up the permissions for my system service somewhere. Does any of you > tried to do something similar? > > The erros I get are: > > E/ErdMngr( 88): Error starting enable BT intent: No Activity found > to handle Intent { act=android.bluetooth.adapter.action.REQUEST_ENABLE > flg=0x10000000 } > > E/ErdMngr( 88): Error starting enable BT intent: No Activity found > to handle Intent { act=android.bluetooth.adapter.action.REQUEST_ENABLE > flg=0x10000000 } > > E/ErdMngr ( 88) Error ensuring BT device is discoverable: No Activity > found to handle Intent > { act=android.bluetooth.adapter.action.REQUEST_DISCOVERABLE > flg=0x10000000 (has extras) } > > D/ErdMngr( 88): Bluetooth discovering > I/ActivityManager( 88): Starting activity: Intent > { act=android.bluetooth.adapter.action.REQUEST_DISCOVERABLE > flg=0x10000000 (has extras) } > > And the code: > > //In run (for the thread), I define the intents: > IntentFilter intentFilter = new IntentFilter(); > intentFilter.addAction(ALARM_WAKEUP); > intentFilter.addAction(ALARM_TIMEOUT); > intentFilter.addAction(BluetoothDevice.ACTION_FOUND); > > intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); > mContext.registerReceiver(mBroadcastReciever, intentFilter); > > //And then it calls a method to start bluetooth > private void loadInterfaces(){ > > Log.d(TAG, "Loading interfaces"); > //At this point, interfaces must be ready > > mBtAdapter = BluetoothAdapter.getDefaultAdapter(); > try{ > //Enable interface > enableBluetooth(); > } > catch(Exception e){ > Log.e(TAG, "Failed to enable interface"); > } > try{ > //Ensure interface is discoverable > ensureBluetoothDiscoverability(); > } > catch(Exception e){ > Log.e(TAG, "Failed to set BT interface discoverable"); > } > > } > > private void enableBluetooth(){ > Log.d(TAG, "enableBluetooth()"); > if(!mBtAdapter.isEnabled()){ > Intent enableBtIntent = new Intent > (BluetoothAdapter.ACTION_REQUEST_ENABLE); > > enableBtIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); > try{ > mContext.startActivity(enableBtIntent); > } > catch(Exception e){ > Log.e(TAG, "Error starting enable BT intent: > "+e.getMessage()); > } > > } > else{ > Log.e(TAG, "BT Interface already enabled"); > } > } > > private void ensureBluetoothDiscoverability(){ > Log.d(TAG, "Ensuring bluetoot is discoverable"); > if(mBtAdapter.getScanMode()!= > BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE){ > Log.e(TAG, "Device was not in discoverable mode"); > Intent discoverableIntent = new > Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); > > discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, > 300); > > //Without specifying the flags, it returns the > exception: "Calling > startActivity() from outside of an Activity context requires the > FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?" > > discoverableIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); > try{ > mContext.startActivity(discoverableIntent); > Log.d(TAG, "Device set up as discoverable"); > } > catch(Exception e){ > Log.e(TAG, "Error ensuring BT device is > discoverable: > "+e.getMessage()); > } > } > else{ > Log.e(TAG, "Device already discoverable"); > } > } > > //TODO: It should specify which interface to use (argument) > private void startDiscovery(){ > > if (mBtAdapter.isDiscovering()){ > Log.e(TAG, "BT Interface already discovering. > Cancelling"); > mBtAdapter.cancelDiscovery(); > } > ensureBluetoothDiscoverability(); > > try{ > mBtAdapter.startDiscovery(); > Log.d(TAG, "Bluetooth discovering"); > } > catch(Exception e){ > Log.e(TAG, "Error when starting bluetooth discovery: > "+e.getMessage()); > } > } > > I've tried both with an HTC G1 and a Nexus one and in both cases I get > the same error (so it's not a platform issue as I initially thought). > I guess that there's an specific difference of using bluetooth as if > it were a System Service compared to an standard app (there's no > manifest for the permissions?). The Bluetooth indicator never appears > in the screen as with the application. > > Any indication will be very welcome! > > Many thanks, > > N
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