activity：

@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);

   editText=findViewById(R.id.et_input);
   
   manager=getFragmentManager();
   transaction=manager.beginTransaction();
   transaction.add(R.id.content_layout,new ResultFragment());
   transaction.commit();
}

   // 通过点击事件将edittext中的内容传递给Resultfagment

public void send(View view) {
   /*
   * 1.获取输入框输入的内容
   * */
   String  info=editText.getText().toString().trim();
   // 创建bundle对象，将需要传递的数据存储到bundle中 然后调用fragment的setArguments()方法传递bundle
   ResultFragment rf=new ResultFragment();
   Bundle bundle=new Bundle();
   bundle.putString("info",info);
   rf.setArguments(bundle);
   
   manager=getFragmentManager();
   transaction=manager.beginTransaction();
   transaction.replace(R.id.content_layout,rf);
   transaction.commit();
}

fragment：

public class ResultFragment extends android.app.Fragment {

   private TextView textView;
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
                            Bundle savedInstanceState) {
       // Inflate the layout for this fragment
                 View view=inflater.inflate(R.layout.fragment_result,null);
                 Bundle bundle=getArguments();
                  String info=bundle.getString("info");
                  textView=view.findViewById(R.id.tv_result);
                   textView.setText(info);
           return view;
   }
logcat:

   Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference