Android Fragment

最新推荐文章于 2020-06-03 18:58:49 发布

原创最新推荐文章于 2020-06-03 18:58:49 发布 · 215 阅读

CC 4.0 BY-SA版权

本文详细介绍如何在Android应用中使用Fragment进行界面加载与管理。通过继承Fragment并重写关键方法，实现视图的创建与更新。同时，讲解了如何在Activity中通过FragmentManager加载Fragment，以及Fragment之间的替换与参数传递，为开发者提供实用的代码示例。

Framgment加载

1.继承Fragment,重写onCreateView,onActivityCreated方法

//FirstFragment
public class FirstFragment extends Fragment {
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
       return inflater.inflate(R.layout.first_fragment, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        FragmentActivity fragmentActivity = getActivity();
        fragmentActivity.findViewById(R.id.viewId).setText("123456");
    }
 }

2.xml文件中添加Layout,id为fragment
Activity创建时使用FragmentManager 加载

//Activity OnCreate
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.fragment, new FirstFragment());
transaction.commit();

Fragment之间的替换与参数传递

//FirstFragment
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
Bundle bundle = new Bundle();
bundle.putString("text","123");
NextFragment fragment = new NextFragment();
fragment.setArguments(bundle);
transaction.replace(R.id.fragment,fragment);
transaction.commit();

//NextFragment
public class FirsrtFragment extends Fragment {
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
       return inflater.inflate(R.layout.next_fragment, container, false);
    }

    @Override
     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        String text = this.getArguments().get("text").toString();
        FragmentActivity fragmentActivity = getActivity();
    	fragmentActivity.findViewById(R.id.mTextView)).setText(text);
 	}
 }