`bluetoothAdapter.enable();`

enable()源码：

public boolean enable() {
    if (isEnabled()) {
        if (DBG) {
            Log.d(TAG, "enable(): BT already enabled!");
        }
        return true;
    }
    try {
        return mManagerService.enable(ActivityThread.currentPackageName());
    } catch (RemoteException e) {
        Log.e(TAG, "", e);
    }
    return false;
}

业务代码：

bluetoothAdapter.enable();
bluetoothAdapter.startDiscovery();
Set<BluetoothDevice> savedDevices = bluetoothAdapter.getBondedDevices();
if (savedDevices.size() > 0) {
    for (BluetoothDevice device : savedDevices) {
        String deviceName = device.getName();
        String deviceAddress = device.getAddress();
        arr.add(new BluetoothBean(deviceName, deviceAddress, BluetoothBean.SAVED));
    }
}

现在的问题是调用了`bluetoothAdapter.enable();`，但还没开启蓝牙，我就已经调用了下面的业务`bluetoothAdapter.getBondedDevices()`，导致Set.size() = 0，请问下有何解决方法嘛？

问题更新，现在在原来的业务代码上进行了改进，改了后的业务代码如下：

bluetoothAdapter.enable();
while(sysAdapter.getState() != BluetoothAdapter.STATE_ON);  //modify by wayhoi. waitting for bluetooth to turn on
bluetoothAdapter.startDiscovery();
Set<BluetoothDevice> savedDevices = bluetoothAdapter.getBondedDevices();
if (savedDevices.size() > 0) {
    for (BluetoothDevice device : savedDevices) {
        String deviceName = device.getName();
        String deviceAddress = device.getAddress();
        arr.add(new BluetoothBean(deviceName, deviceAddress, BluetoothBean.SAVED));
    }
}