onActivityResult never gets called

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Java

Mobile

Android

I have the MainActivity and a BluetoothActivity. The following code is from BluetoothActivity:

private Context context;
private TextView textView;
private final int REQUEST_ENABLE_BT = 1;
private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
 public Bluetooth(Context context){
        //constructor
        this.context=context;
        textView =  new TextView(this.context);
    }
public void bluetoothActivate(){
   if(!mBluetoothAdapter.isEnabled()) {
      Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
      ((Activity) context).startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
   }
 }

protected void onActivityResult(int requestCode, int resultCode, Intent data){
    textView.setText(resultCode);
    ((Activity) context).setContentView(textView);
 }

AndroidStudio tells me the function onActivityResult is never used.
When I test the App on my Phone, I get the BluetoothRequest and can Choose my answer but afterwards the ContentView shows nothing.

Somebody knows how to get the Result in this BluethoothActivity?