AndroidStudio中简单使用Fragment

墨蓝 2022-07-16 15:18 349阅读 0赞

在新建的AndroidStudio工程中新建一个Fragment组件：  
![这里写图片描述][SouthEast]  
确认无误后点击“finish”：  
![这里写图片描述][SouthEast 1]  
然后AS会自动为你生成一个布局文件和一个相关类：  
![这里写图片描述][SouthEast 2]  
注意，如果你在新建Fragment时勾选了“Include interface callback”(即上图中用红色直线标记的部分)选项，则在为你生成的类中会多出一个回掉接口“OnFragmentInteractionListener”：

/**
         * This interface must be implemented by activities that contain this
         * fragment to allow an interaction in this fragment to be communicated
         * to the activity and potentially other fragments contained in that
         * activity.
         * <p>
         * See the Android Training lesson <a href=
         * "http://developer.android.com/training/basics/fragments/communicating.html"
         * >Communicating with Other Fragments</a> for more information.
         */
        public interface OnFragmentInteractionListener {
        
            // TODO: Update argument type and name
            void onFragmentInteraction(Uri uri);
        }

如它注释所说，你必须在你使用这个Fragment的Activities中实现它：

package com.example.lenovo.lfragment;
    
    import android.net.Uri;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    
    import layout.BlankFragment;
    
    public class MainActivity extends AppCompatActivity implements BlankFragment.OnFragmentInteractionListener {
          //继承接口OnFragmentInteractionListener
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            getSupportFragmentManager().beginTransaction().add(R.id.container,new BlankFragment()).commit();//R.id.container 为启动该Fragment的Activity的id
        }
        public void onFragmentInteraction(Uri uri){   //实现OnFragmentInteractionListener接口中的函数
    
        }
    
    }

这样你就可以成功启动Fragment了;  
![这里写图片描述][SouthEast 3]

[SouthEast]: /images/20220709/672d1c75e1ae41e395b20b59292e9ab2.png
[SouthEast 1]: /images/20220709/3b446c25135144bca55ecf02a9c892bc.png
[SouthEast 2]: /images/20220709/6b0b8b1abea843e58729e7148436aead.png
[SouthEast 3]: /images/20220709/a9b4f5f5fe4546568cc84c67bf4d2df2.png