将元素绑定到代码后，为什么我的代码总是收到空指针异常？我在Android Studio中使用Java

Question

尽管我已经正确绑定了元素，但是我正在接收java.lang.NullPointerException。

试图检查元素的ID，它匹配，但是我仍然收到相同的异常。

MainActivity.java

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    //Text to Speech

    tts = new TextToSpeech(this, this);

    speakButton = findViewById(R.id.speakButton);

    speechText = findViewById(R.id.speechText);

    speakButton.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            speakOut();

        }

    });

    // End

    loadFragment(new HomeFragment());

    BottomNavigationView navigation = findViewById(R.id.navigation);

    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

}

TranslatorFragment.java

public class TranslatorFragment extends Fragment {

public Button speakButton;

public TranslatorFragment(){

    //Empty Constructor

}

@Override

public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    return inflater.inflate(R.layout.translator_fragment, container, false);

}

public void onActivityCreated(Bundle savedInstanceState) {

    super.onActivityCreated(savedInstanceState);

}

@Override

public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {

    super.onViewCreated(view, savedInstanceState);

    speakButton = view.findViewById(R.id.speakButton);

}

}

它应该运行正常，但是我收到了java.lang.NullPointerException