getAdapter return null, use of a promise to init Bluetooth.

[carlosdelfino]

I'm starting to study the plugin for use of Bluetooth.

Unfortunately I discovered that the tablet I have does not have bluetooth, so when I initialize the plugin I get an exception, since the getAdapter function returns null.

Given this I would suggest that this plugin's start point would be a 'Promise' something like:

Bluetooth.init = function() {
  return new Promise(function(resolve, reject) { 
      var bluetoothManager = utils.ad.getApplicationContext().getSystemService(android.content.Context.BLUETOOTH_SERVICE);
      adapter = bluetoothManager.getAdapter();
      if(adapter === null) {
         reject("this device not have bluetooth!");
         return;
       }
       //......
  });
}; 

And this initialization was controlled by the application, so we would have access to the 'then' and 'cath' functions to take some action so the application did not break.

[davorpeic]

Well, technically you should/could call 'init' inside or after checking isBluetoothEnabled method, which in this case should return false if no bluetooth turned on/existing.

dp