如何修复此按钮，它无法转到活动页面？

Question

public class select_fragment extends Fragment {    @Nullable    @Override    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_select, null);    }    private void button_parking(){        Intent myIntent = new Intent(f, parking.class);        startActivity(myIntent);    }}

Answer 1

试试这个...

public class select_fragment extends Fragment {

@Nullable

@Override

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup 

container, @Nullable Bundle savedInstanceState) {

    Button your_button = (Button) getActivity.findViewById(R.id.your_id_button)

    your_button.setOnClickListener(new OnClickListener() {

    public void onClick(View v)

    {

       button_parking();

    } 

    });

    return inflater.inflate(R.layout.fragment_select, null);

    }

    private void button_parking(){

    Intent myIntent = new Intent(getActivity(), parking.class);

    startActivity(myIntent);

}

}

Answer 2

您尚未将视图绑定到片段，因此单击按钮无法正常工作。您需要使用 绑定视图。通常，您需要通过重写如下内容来执行绑定：findViewById()onViewCreated()

public class select_fragment extends Fragment {

    @Nullable

    @Override

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

        return inflater.inflate(R.layout.fragment_select, null);

    }

    @Override

    public void onViewCreated(View view, Bundle savedInstanceState) {

        super.onViewCreated(view, savedInstanceState);

         // bind the view here.

         Button button = findViewById(R.id.your_button);

         button.setOnClickListener(new View.OnClickListener() {

             public void onClick(View v) {

                 //call button method here

                 button_parking();

             }

         });

    }

    private void button_parking() {

        Intent myIntent = new Intent(f, parking.class);

        startActivity(myIntent);

    }

}