Question

In my app I use some Fragments with some Buttons that help to navigate through different contents. The layout I built works perfectly, but now i want to make the links for the Buttons.

MY BUTTON ID IS: buttonSP

Where can I add the onClickListener in my code snippet to open a new Activity named: Lista_Smartphone?

FragmentWithOneImage.java

public class FragmentWithOneImage extends Fragment {
private String title;
private int image;


public static FragmentWithOneImage newInstance(String title, int resImage) {
    FragmentWithOneImage fragment = new FragmentWithOneImage();
    Bundle args = new Bundle();
    args.putInt("image", resImage);
    args.putString("title", title);
    fragment.setArguments(args);
    return fragment;
}


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    image = getArguments().getInt("image", 0);
    title = getArguments().getString("title");
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_one_img, container, false);
    TextView tvLabel = (TextView) view.findViewById(R.id.txtMain);
    tvLabel.setText(title);

    ImageView imageView = (ImageView) view.findViewById(R.id.imgMain);
    imageView.setImageResource(image);
    return view;
}
}

Answer 1

在 onCreateView（）方法中添加以下代码

void q3():{}
{
    q0() | <END>
}

Answer 2

将它放在onCreateView（）方法上。它等同于活动类的onCreate（）

Answer 3

使用onActivityCreated()方法，有时在onCreateView()中查找视图需要花费时间，在这些情况下可能会出现空指针异常。

   public class FragmentWithOneImage  extends Fragment {


    TextView tvLabel;
    ImageView imageView;
    Button button;

    public static FragmentWithOneImage newInstance(String title, int resImage) {
        FragmentWithOneImage fragment = new FragmentWithOneImage();
        Bundle args = new Bundle();
        args.putInt("image", resImage);
        args.putString("title", title);
        fragment.setArguments(args);
        return fragment;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_one_img, container, false);
        return view;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        tvLabel = (TextView) view.findViewById(R.id.txtMain);
        imageView = (ImageView) view.findViewById(R.id.imgMain);
        button=(Button)view.findViewById(R.id.button);

    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        tvLabel.setText(title);
        imageView.setImageResource(image);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent=new Intent(getActivity(),Lista_Smartphone.class);
                startActivity(intent);
            }
        });


    }
}

Where can i put an onClickListener in my Fragment?

3 个答案: