我试图在一个片段中创建一个ImageView,它将引用我在XML中为片段创建的ImageView元素。但是,findViewById方法仅在扩展Activity类时有效。我是否也可以在Fragment中使用它?

public class TestClass extends Fragment {
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        ImageView imageView = (ImageView)findViewById(R.id.my_image);
        return inflater.inflate(R.layout.testclassfragment, container, false);
    }
}

findViewById方法有一个错误,说明该方法未定义。


当前回答

布局增压机进入图片这里。布局扩展器是一个使我们能够在java代码中使用XML视图的类。因此,您可以使用以下代码在变量v中扩展根xml视图。然后使用v,你可以找到根视图v的子视图。

public class TestClass extends Fragment {
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.testclassfragment, container, false);
    ImageView imageView = (ImageView)v.findViewById(R.id.my_image);
    return v;
    }
}

其他回答

//here you can do it by
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState)
  {
    // Inflate the layout for this fragment
    final View view =  inflater.inflate(R.layout.fragment_apple, container, 
 false);
    ist = view.findViewById(R.id.linearLink);
    second = view.findViewById(R.id.linearPhone);
    return view;

非常简单的方法:

 @Nullable
        @Override
        public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View fragmentView = inflater.inflate(R.layout.testclassfragment, container, false);
            ImageView imageView = (ImageView)fragmentView.findViewById(R.id.my_image);
            return fragmentView;
       }

最简单的方法就是用黄油刀 这样你就可以像下面描述的那样通过@OnClick()添加尽可能多的Onclciklisteners:

public class TestClass extends Fragment {
    @BindView(R.id.my_image) ImageView imageView;
    @OnClick(R.id.my_image)
    public void my_image_click(){
        yourMethod();
    }
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.testclassfragment, container, false);
        ButterKnife.bind(getActivity,view);
        return view;
    }
}

你需要膨胀Fragment的视图,并在它返回的视图上调用findViewById()。

public View onCreateView(LayoutInflater inflater, 
                         ViewGroup container, 
                         Bundle savedInstanceState) {
     View view = inflater.inflate(R.layout.testclassfragment, container, false);
     ImageView imageView = (ImageView) view.findViewById(R.id.my_image);
     return view;
}

在Fragment类中,我们得到onViewCreated()重写方法,我们应该总是初始化我们的视图,因为在这个方法中我们得到视图对象。使用这个对象,我们可以像下面这样找到我们的视图:

class MyFragment extends Fragment {
    private ImageView imageView;

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

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        //initialize your view here for use view.findViewById("your view id")
        imageView = (ImageView) view.findViewById(R.id.my_image);
    }
}