Bluetooth List devices array

Answers

• pigeon

  January 2018

  Ok I have made some progress in looking at the backend java code of ketai library and how that accesses the ArrayList discoverable names.

  I still cannot seem to instance the getDiscoveredDeviceNames().get(i) correctly in the draw loop so at the moment its doing nothing particularly useful. The aim is to associate an RSSI value to each new DiscoveredDeviceName.

  import android.content.BroadcastReceiver;
  import android.content.Context;
  import android.content.Intent;
  import android.content.IntentFilter;
  import android.os.Bundle;
  import android.app.ListActivity;
  import android.widget.ArrayAdapter;
  import android.widget.ListView;
  import android.os.Looper;
  import android.app.Activity;
  import android.app.Fragment;
  
  import android.bluetooth.BluetoothAdapter;
  import android.bluetooth.BluetoothDevice;
  
  Activity act;
  Context mc;
  
  String discoveredDeviceName;
  String info = "";
  short rssi;
  boolean foundDevice=false; //When this is true, the screen turns green.
  ArrayList<String> devicesDiscovered = new ArrayList();
  
  
  //Get the default Bluetooth adapter
  BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();
  
  
  
  void setup()
  {
    fullScreen();
    orientation(LANDSCAPE);
    textSize(28);
    textAlign(CENTER, CENTER);
    fill(225);
  
    /*IF Bluetooth is NOT enabled, then ask user permission to enable it */
    if (!bluetooth.isEnabled()) {
      Intent requestBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
      this.getActivity().startActivityForResult(requestBluetooth, 0);
    }
  
    /*If Bluetooth is now enabled, then register a broadcastReceiver to report any
     discovered Bluetooth devices, and then start discovering */
    if (bluetooth.isEnabled()) {
      this.getActivity().registerReceiver(myDiscoverer, new IntentFilter(BluetoothDevice.ACTION_FOUND));
      //registerReceiver(myDiscoverer, new IntentFilter(BluetoothDevice.ACTION_FOUND));
      //Start bluetooth discovery if it is not doing so already
      if (!bluetooth.isDiscovering()) {
        bluetooth.startDiscovery();
      }
    }
  }
  
  void draw()
  {
  
    background(25, 25, 220);
    getDiscoveredDeviceNames();
  
  
    if (foundDevice) {
      background(0, 255, 0, 100);
      fill(0);
      text("Found Device" +discoveredDeviceName+"\nRSSI: " + abs(rssi), width/2, (height/2+150));
  
      if (getDiscoveredDeviceNames().size() > 0) {
  
        for (int i=0; i<getDiscoveredDeviceNames().size(); i++) {
          String myText = getDiscoveredDeviceNames().get(i);
          fill(0);
          text(myText, width/2, height/2);
        }
      }
    }
  
  
    //update the RSSI values every 10th of a frame.  
    if (frameCount%10==0) {
      discoverDevices();
      //getDiscoveredDeviceNames();
      //  delay(500);//don't use delay in Processing.
    }
  }
  
  public void discoverDevices() {
    if (bluetooth.isDiscovering()) {
      if (frameCount%5==0) {
        bluetooth.cancelDiscovery();
      }
      //delay(100); // DONT CHANGE 100ms GOOD VALUE
      bluetooth.startDiscovery();
    } else {
      bluetooth.startDiscovery();
    }
  }
  
  
  @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode==0) {
      if (resultCode == 1) {
        text("Bluetooth has been switched ON", 10, 10);
      } else {
        text("You need to turn Bluetooth ON !!!", 10, 10);
      }
    }
  }
  
  /* Create a Broadcast Receiver that will later be used to 
   receive the names of Bluetooth devices in range. */
  BroadcastReceiver myDiscoverer = new myOwnBroadcastReceiver();
  
  /* This BroadcastReceiver will display discovered Bluetooth devices */
  public class myOwnBroadcastReceiver extends BroadcastReceiver {
    @Override
      public void onReceive(Context context, Intent intent) {
      //discoveredDeviceName = intent.getStringExtra(BluetoothDevice.EXTRA_NAME);
  
      // println("RSSI: " + rssi);
      //Display the name of the discovered device
      //println("Discovered: " + discoveredDeviceName);
  
      //Change foundDevice to true which will make the screen turn green
      foundDevice=true;
  
      String action = intent.getAction();
      if (BluetoothDevice.ACTION_FOUND.equals(action)) {
        // Discovery has found a device. Get the BluetoothDevice
        // object and its info from the Intent.
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI, Short.MIN_VALUE);
        String deviceName = device.getName();
        String deviceHardwareAddress = device.getAddress(); // MAC address
        //printArray(deviceName);
        //printArray(deviceHardwareAddress);
        //printArray(rssi);
        // Add the name and address to an array adapter to show in a ListView
        //ArrayAdapter.add(device.getName() + "\n" + device.getAddress());
  
        //devicesDiscovered.add(discoveredDeviceName + "\n" + rssi);
        //for (String device02 : devicesDiscovered) {
  
        //  printArray(device02);
        //}
      }
    }
  }
  
  public ArrayList<String> getDiscoveredDeviceNames() {
    ArrayList<String> devices = new ArrayList<String>();
  
    for (String device : devicesDiscovered) {
  
      devices.add(device);
    }
    return devices;
  }
  
• akenaton

  January 2018 Answer ✓

  @pigeon===

  Looking quickly to your code i think that it cannot run because you never instantiate your receiver and never call your broadcast class.
• pigeon

  January 2018

  @akenation Thank you -yes that makes sense! A case of not seeing the wood for the trees there. So in instantiating the receiver like so..

  myOwnBroadcastReceiver bt;

  in setup bt = new myOwnBroadcastReceiver();

  when calling the onReceive(Context context, Intent intent) function in draw loop like so

  bt.onReceive(Context context, Intent intent);

  is my intent 'discoveredDeviceName' I'm unsure what my context is here?

  bt.onReceive(Context context, discoveredDeviceName);
• akenaton

  January 2018 edited January 2018 Answer ✓

  @pigeon===

  code snippet tested (with required permissions): it works; i have simplified your code (and suppressed some errors: your background cannot never be seen as green!!!!) but you can now easily get all infos about blueTooth devices: could be better to make an arrayList of all blueTooth objects and methods to get name, mac adress, rssi and so on...Think to unregister your receiver onPause (with cancelDiscovery()); see also that rssi can change, or new devices be discovered: your text in draw() can be difficult to read!

                  import android.Manifest;
                  import android.content.BroadcastReceiver;
                  import android.content.Context;
                  import android.content.Intent;
                  import android.content.IntentFilter;
                  import android.os.Bundle;
                  import android.app.ListActivity;
                  import android.widget.ArrayAdapter;
                  import android.widget.ListView;
                  import android.os.Looper;
                  import android.app.Activity;
                  import android.app.Fragment;
                  import android.content.pm.PackageManager;
                  import android.os.Build;
                  int MyVersion = Build.VERSION.SDK_INT;
  
                  import android.bluetooth.BluetoothAdapter;
                  import android.bluetooth.BluetoothDevice;
  
                  Activity act;
                  Context mc;
  
                  String discoveredDeviceName;
                  String info = "";
                  short rssi;
                  boolean foundDevice=false; //When this is true, the screen turns green.
                  ArrayList<String> devicesDiscovered = new ArrayList<String>();
  
  
                  //Get the default Bluetooth adapter
                  BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();
                  BroadcastReceiver myDiscoverer;
  
  
  
                  void setup()
                  {
                    fullScreen();
                    orientation(LANDSCAPE);
                    textSize(28);
                    textAlign(CENTER, CENTER);
                    fill(225);
                    act = this.getActivity();
  
                    /*IF Bluetooth is NOT enabled, then ask user permission to enable it */
                    if (!bluetooth.isEnabled()) {
                      Intent requestBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                      this.getActivity().startActivityForResult(requestBluetooth, 0);
                    }
                    bluetooth.startDiscovery();
                    myDiscoverer = new myOwnBroadcastReceiver();
                    /*If Bluetooth is now enabled, then register a broadcastReceiver to report any
                     discovered Bluetooth devices, and then start discovering */
                    if (bluetooth.isEnabled()) {
  
                      IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
                      this.getActivity().registerReceiver(myDiscoverer, filter);
  
                      if (!bluetooth.isDiscovering()) {
                        bluetooth.startDiscovery();
                      }
                    }
                  };
  
                  void draw()
                  {
                  if(!foundDevice){
                    background(25, 25, 220);
                  }
  
                    if (bluetooth.isDiscovering()== false) {
                      bluetooth.startDiscovery();
                    }
                    if (foundDevice) {
                      background(0, 255, 0, 100);
                      fill(0);
                      //text("Found Device" +discoveredDeviceName+"\nRSSI: " + abs(rssi), width/2, (height/2+150));
  
                      if (devicesDiscovered.size() > 0) {
  
                        for (int i=0; i<devicesDiscovered.size(); i++) {
                          String myText = devicesDiscovered.get(i);
                          fill(0);
                          text(myText, width/2, height/2);
                        }
                      }
                    }
                  };
  

  //@Override public void onActivityResult(int requestCode, int resultCode, Intent data) { println(requestCode); if (requestCode==0) { if (resultCode == 1) { text("Bluetooth has been switched ON", 10, 10); } else { text("You need to turn Bluetooth ON !!!", 10, 10); } } }

  /* Create a Broadcast Receiver that will later be used to receive the names of Bluetooth devices in range. / / This BroadcastReceiver will display discovered Bluetooth devices */

  public class myOwnBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) {

  String action = intent.getAction();
  if (BluetoothDevice.ACTION_FOUND.equals(action)) {
    foundDevice=true;
    println("Discovered: " );
    // Discovery has found a device. Get the BluetoothDevice
    // object and its info from the Intent.
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI, Short.MIN_VALUE);
    String deviceName = device.getName();
    String deviceHardwareAddress = device.getAddress(); // MAC address
  
    devicesDiscovered.add(deviceName + "\n" + rssi);
    println(devicesDiscovered);
  
  } else {
    println("no device");
  }
  

  } }

  void onPause() { super.onPause(); if (myDiscoverer!=null) { bluetooth.cancelDiscovery();

  println("je désenregistre");
  

  } }
• pigeon

  January 2018

  @akenation ---> WoW! thank you. i really appreciate you taking the time to compile this for me. I don't think i would have gotten to the intentFilter part at all by myself. I will post a version here soon taking on board your advice about unregistering the receiver. Looking forward to utilising the discovered devices in interactive installation contexts. Thanks again