I am trying to scan for available devices but the scan does not seem to
find any devices. The app works and displays using Toast when the discovery
starts and finishes but doesnt show a device, the turning on & off of BT
works as well as displaying the paired devices.. I know there are available
devices as the scan in settings show that they are there. I followed quite
a few tutorials (this is my 6th attempt) and each of them come out with
something similar which doesnt work. I have been to the play store and
downloaded 8 different bluetooth scanners and only 50% of them actually
worked.
I am using a Samsung S6 for testing and development. My goal is to find and
connect to certain devices for communication and control but i want to be
able to scan for them first.
Can anyone spot/see anything in the code which could cause it not to work
or something I have missed?
MainActivity.java
public class MainActivity extends Activity {
private Button bluetoothOn;
private Button bluetoothOff;
private Button bluetoothScan;
private Button bluetoothPaired;
private BluetoothAdapter myBluetoothAdapter;
private ArrayAdapter<String> btArrayAdapter;
private ListView listDevicesFound;
private Set<BluetoothDevice>pairedDevices;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bluetoothOn= (Button)findViewById(R.id.btnOn);
bluetoothOff= (Button)findViewById(R.id.btnOff);
bluetoothPaired = (Button)findViewById(R.id.btnPaired);
bluetoothScan = (Button)findViewById(R.id.btnScan);
listDevicesFound = (ListView)findViewById(R.id.devicesfound);
btArrayAdapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1);
btArrayAdapter.setNotifyOnChange(true);
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
listDevicesFound.setAdapter(btArrayAdapter);
registerReceiver(myBluetoothReceiver, new
IntentFilter(BluetoothDevice.ACTION_FOUND));
}
public void scanonClick(View v) {
// TODO Auto-generated method stub
btArrayAdapter.clear();
myBluetoothAdapter.startDiscovery();
}
public void btonClick(View v) {
// TODO Auto-generated method stub
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOn = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOn, 0);
Toast.makeText(getApplicationContext(),"Turned on"
,Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(getApplicationContext(), "Already on",
Toast.LENGTH_LONG).show();
}
}
public void btoffClick(View v) {
// TODO Auto-generated method stub
myBluetoothAdapter.disable();
Toast.makeText(getApplicationContext(),"Turned off" ,
Toast.LENGTH_LONG).show();
}
public void paironClick(View v) {
// TODO Auto-generated method stub
pairedDevices = myBluetoothAdapter.getBondedDevices();
@SuppressWarnings("rawtypes")
ArrayList list = new ArrayList();
for(BluetoothDevice bt : pairedDevices)
list.add(bt.getName());
Toast.makeText(getApplicationContext(),"Showing Paired Devices",
Toast.LENGTH_SHORT).show();
@SuppressWarnings("rawtypes")
final ArrayAdapter adapter = new
ArrayAdapter(MainActivity.this,android.R.layout.simple_list_item_1, list);
listDevicesFound.setAdapter(adapter);
}
private final BroadcastReceiver myBluetoothReceiver = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device =
intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
btArrayAdapter.add(device.getName() + "\n" + device.getAddress());
btArrayAdapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), "Run
G",Toast.LENGTH_LONG).show();
}
}};
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(myBluetoothReceiver);
}
}
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