无法使用 Android BT API 方法

Question

I'm developing an android app that needs a BT connection. After reading the Android Developers page, the given method such us isEnabled() doesn't work. The error is cannot resolve symbol isEnabled . The imported library is android.bluetooth.BluetoothAdapter . In the manifest file, following the instructions of the Android page, I also have inserted the permission to Bluetooth, BT admin and fine location. The code:

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
    Log.i("Fallo","Dispositivo sin bluetooth");
}

if (!bluetoothAdapter.isEnabled()) {
    Intent enableBtIntent = new     Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
    }

}

Answer 1

You are creating your BluetoothAdapter object outside the onCreate method. Put everything inside the onCreate curly brackets.