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Hello,
After a lot of research and study I managed to finish a class that returns me the paired and connected bluetooth devices near an Android.
The problem I’m encountering is time to update my ListView with the devices that are connected. The paired already gave.
The problem is the following, the list I am defining in setAdapter() does not have the Bluetooth device I connected, for some reason this list is filled afterward that the setAdapter() is executed and I couldn’t understand why.
Listarbluetoothactivity.java
package br.ufscar.dc.controledepatrimonio.Forms;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import br.ufscar.dc.controledepatrimonio.R;
import br.ufscar.dc.controledepatrimonio.Util.RFID.Bluetooth;
import br.ufscar.dc.controledepatrimonio.Util.RFID.BluetoothListener;
public class ListarBluetoothActivity extends AppCompatActivity implements BluetoothListener {
private Bluetooth bluetooth = new Bluetooth(this);
private final static int REQUEST_ENABLE_BT = 1;
private List<BluetoothDevice> listaDispositivos = new ArrayList();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listar_bluetooth);
//region Bluetooth
switch (bluetooth.verificarEstado()) {
case LIGADO:
bluetooth.iniciarBusca(this, this);
listaDispositivos = bluetooth.getListaDispostivo();
ListView lstBluetooth = (ListView) findViewById(R.id.lstBluetooth);
BluetoothAdapter itemBluetooth = new BluetoothAdapter(this, listaDispositivos);
lstBluetooth.setAdapter(itemBluetooth);
break;
case DESLIGADO:
Intent enableBtIntent = new Intent(bluetooth.getDispositivo().ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
break;
case NAO_COMPATIVEL:
Toast.makeText(getApplicationContext(), R.string.msg_bluetooth_nao_suportado, Toast.LENGTH_SHORT).show();
break;
}
//endregion
//region Botão Procurar
Button btnProcurar = (Button) findViewById(R.id.btnProcurar_Bluetooth);
btnProcurar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
}
});
//endregion
}
//region Bluetooth
@Override
public void action(String action) {
if (action.compareTo(ACTION_DISCOVERY_FINISHED) == 0) {
listaDispositivos = bluetooth.getListaDispostivo();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if (requestCode == REQUEST_ENABLE_BT) {
switch (resultCode) {
case RESULT_CANCELED:
//Não habilitou Bluetooth, então fecha a tela.
finish();
break;
}
}
}
//endregion
//region Métodos não utilizados
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_listar_bluetooth, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//endregion
}
Bluetooth.java
package br.ufscar.dc.controledepatrimonio.Util.RFID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
public class Bluetooth extends BroadcastReceiver {
private BluetoothListener listener;
private BluetoothAdapter dispositivo;
private List<BluetoothDevice> listaDispostivo = new ArrayList<>();
public enum Estado {
LIGADO, DESLIGADO, NAO_COMPATIVEL
}
public Bluetooth (BluetoothListener listener) {
dispositivo = BluetoothAdapter.getDefaultAdapter();
this.listener = listener;
getDispositivosPareados();
}
public BluetoothAdapter getDispositivo() {
return dispositivo;
}
public List<BluetoothDevice> getListaDispostivo(){
return listaDispostivo;
}
//region getDispositivosPareados: Retorna todos dispositivos que já estão pareados com o aparelho
private void getDispositivosPareados() {
Set<BluetoothDevice> pairedDevicesList = dispositivo.getBondedDevices();
if (pairedDevicesList.size() > 0) {
for (BluetoothDevice device : pairedDevicesList) {
listaDispostivo.add(device);
}
}
}
//endregion
//region verificarEstado: Verifica se o recurso do Bluetooth está ativo
public Estado verificarEstado() {
if (dispositivo == null) {
return Estado.NAO_COMPATIVEL;
}
if (!dispositivo.isEnabled()) {
return Estado.DESLIGADO;
}
return Estado.LIGADO;
}
//endregion
//region iniciarBusca: Inicia a busca de dispositivos que não estão pareados
public void iniciarBusca(Context context, BluetoothListener listener) {
Bluetooth bluetooth = new Bluetooth(listener);
// Registro os Broadcast necessarios para a busca de dispositivos
IntentFilter filter = new IntentFilter(BluetoothListener.ACTION_FOUND);
IntentFilter filter2 = new IntentFilter(BluetoothListener.ACTION_DISCOVERY_FINISHED);
IntentFilter filter3 = new IntentFilter(BluetoothListener.ACTION_DISCOVERY_STARTED);
context.registerReceiver(bluetooth, filter);
context.registerReceiver(bluetooth, filter2);
context.registerReceiver(bluetooth, filter3);
// inicio a busca e retorno a classe instanciada.
dispositivo.startDiscovery();
}
//endregion
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
//caso encontre um dispositivo:
if (action.compareTo(BluetoothDevice.ACTION_FOUND) == 0) {
//pega as o dispositivo encontrado:
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
//se a lista já tiver esse dispositivo eu retorno para o proximo
//isso permite que sejá mostrado somente uma vez meu dispositivo
//problema muito comum em exemplos
if (listaDispostivo.contains(device)) {
return;
}
//adiciono o dispositivo na minha lista:
listaDispostivo.add(device);
} else if (action.compareTo(BluetoothAdapter.ACTION_DISCOVERY_FINISHED) == 0) {
//caso o discovery chegue ao fim eu desregistro meus broadcasts
//SEMPRE FAÇA ISSO quando terminar de usar um broadcast
context.unregisterReceiver(this);
}
if (listener != null) {
//se foi definido o listener eu aviso a quem ta gerenciando.
listener.action(action);
}
}
}
I put break-point on the line listaDispostivo.add(device) of the Bluetooth class and it is going through there normally. Including filling the list with the expected value. The error is that this is not reported in the list of setAdapter().
If anyone can shed some light on where I’m going wrong I’d appreciate it :)