Я пытаюсь написать код для приложения для Android, которое использует Bluetooth. Я могу получить доступ к устройствам, с которыми я уже работал, просто отлично, но я не могу обнаружить новые устройства. Я смотрел на переполнение стека, но, похоже, нет прямого ответа для меня. Вот что такое .java, .xml и как оно выглядит.
public class Discover extends AppCompatActivity {
private ArrayList<connectableDevices> found = new ArrayList<connectableDevices>(); // appendable name array
private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); // BT adapter
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_discover);
if(mBluetoothAdapter.isDiscovering()){
mBluetoothAdapter.cancelDiscovery();
}
mBluetoothAdapter.startDiscovery();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
if (mBluetoothAdapter.isDiscovering()){
Toast.makeText(this, "Locating nearby devices...", Toast.LENGTH_LONG).show();
}
BTAdapter BTadapter = new BTAdapter(this, found);
ListView deviceList2 = (ListView) findViewById(R.id.discoverList);
deviceList2.setAdapter(BTadapter);
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
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);
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
found.add(new connectableDevices(deviceName, deviceHardwareAddress));
//MAC.add(deviceHardwareAddress);
}
}
};
@Override
protected void onDestroy() {
super.onDestroy();
//...
mBluetoothAdapter.cancelDiscovery();
// Don't forget to unregister the ACTION_FOUND receiver.
unregisterReceiver(mReceiver);
}
}
И макет
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.rperdomo.btaccelerometerdata.Discover">
<TextView
android:id="@+id/textView3"
android:layout_width="274dp"
android:layout_height="44dp"
android:layout_marginBottom="3dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="3dp"
android:text="Found Devices"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="30sp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="@+id/discoverList"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ListView
android:id="@+id/discoverList"
android:layout_width="395dp"
android:layout_height="454dp"
android:layout_marginBottom="40dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
Выход приложения
