Android Bluetooth Broadcast Receiver did not work

Question

I want to build an application looking for available devices via Bluetooth has Tact of manifest and I did not show my devices available in ListView I do not know what the problem?

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final ArrayAdapter<String> item = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1);
        final Switch sw =(Switch) findViewById(R.id.switch1);
        final BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        final ListView lv =(ListView)findViewById(R.id.listView);
        final Button bu= (Button)findViewById(R.id.button);

    sw.setChecked(false);
    sw.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
             if (!mBluetoothAdapter.isEnabled()&&sw.isChecked())
             {
                 mBluetoothAdapter.enable();

                 Toast.makeText(MainActivity.this, " Bluetooth  enabled", Toast.LENGTH_SHORT).show();
             }
             else if(mBluetoothAdapter.isEnabled()&&!sw.isChecked()) {
                 mBluetoothAdapter.disable();
                 Toast.makeText(MainActivity.this, "Bluetooth disabled", Toast.LENGTH_SHORT).show();
             }
        }
    });

    bu.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                      if (!sw.isChecked())
                          item.clear();
            Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
            if (pairedDevices.size() > 0) {
                for (BluetoothDevice device : pairedDevices) {
                    item.add(device.getName() + "\n" + device.getAddress());

                }


            }
            mBluetoothAdapter.startDiscovery();
            final BroadcastReceiver   ActionFoundReceiver=new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    String action = intent.getAction();

                    if (BluetoothDevice.ACTION_FOUND.equals(action))
                    {
                        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

                        item.add(device.getName()+"\n"+device.getAddress());
                        Toast.makeText(MainActivity.this, device.getName(), Toast.LENGTH_SHORT).show();



                    }
                }
            };
            lv.setAdapter(item);

        }

    });
}

}

Possible duplicate of [Programmatically register a broadcast receiver](http://stackoverflow.com/questions/4805269/programmatically-register-a-broadcast-receiver) — Bertrand Martel, Aug 04 '16 at 22:50

score 0 · Accepted Answer · edited Sep 23 '17 at 04:59

0

There is a couple of issues in your code:

You have not registered the BroadcastReceiver class.
After adding an item to that ArrayAdapter, you should call notifyDataSetChanged method of that ListView. This method call makes the ListView to refresh.

edited Sep 23 '17 at 04:59

Graham

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answered Aug 05 '16 at 09:22

frogatto

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Android Bluetooth Broadcast Receiver did not work

1 Answers1