github地址

https://github.com/zhouxu88/Fragment_Fragment_Data.git

一、使用接口，通过Activity宿主作为中间桥梁，进行数据交互

1）定义数据接口
2）在Activity中实现该接口，并实现接口中定义的方法
3）在Fragment A中声明接口对象,并调用接口中的方法
4)Activity中的接口回调中，向Fragment B传递数据

关键代码
接口：

public interface IAddListener { 
   void update(int count); //更新数据
}

AFragment:

public class AFragment extends Fragment {  
      private int count; //计数器，表示向Fragment B传递的数据   
      private IAddListener listener;   
       @Override 
       public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {      
            View view = inflater.inflate(R.layout.fragment_a, container, false);                
            initView(view);   
             return view;   
   }   

     //初始化View  
      private void initView(View view) {        
      view.findViewById(R.id.btn_add).setOnClickListener(new  View.OnClickListener() {        
      @Override         
      public void onClick(View v) {            
      //数字加1，向Fragment B传递数据          
      count++;            
      listener.update(count); //传递数据                
      this.listener = listener; 
   }
}

Activity:

public class MainActivity extends AppCompatActivity implements IAddListener{   
     private FragmentManager fragmentManager;   
     @Override  
     protected void onCreate(Bundle savedInstanceState) {        
        super.onCreate(savedInstanceState);        
        setContentView(R.layout.activity_main);       
        initFragment();    
  }   

 //初始化Fragment  
  private void initFragment() {      
      fragmentManager = getSupportFragmentManager();        
      AFragment aFragment = new AFragment();      
      FragmentTransaction transaction =     
      fragmentManager.beginTransaction();        
      transaction.add(R.id.fragment_a,aFragment,"AFragment");        
      transaction.add(R.id.fragment_b,new BFragment(),"BFragment");        
      transaction.commit();        
      aFragment.setIAddListener(this); //传递接口对象    
}   

   //回调的接口   
   @Override   
   public void update(int count) {       
     BFragment bFragment = (BFragment) fragmentManager.findFragmentByTag("BFragment");        
     bFragment.update(count);  
  }
}

BFragment：

public class BFragment extends Fragment {  
    private TextView resultTv;   


     @Override  
     public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {      
        View view = inflater.inflate(R.layout.fragment_b, container, false);        
        initView(view);    
        return view;   
 }    
 
 
  //初始化View  
  private void initView(View view) {     
       resultTv = (TextView) view.findViewById(R.id.result_tv);   
 }  

  //供Activity调用的方法  
  public void update(int count) {        
      resultTv.setText(String.valueOf(count)); 
   }
}

二、EventBus传值

关键代码
AFragment:

EventBus.getDefault().post(Integer.valueOf(count));

BFragment:

@Overridepublic void onAttach(Context context) {    
    super.onAttach(context);   
     //注册    
    EventBus.getDefault().register(this);}

@Overridepublic void onDestroyView() { 
   super.onDestroyView();    //解绑    
EventBus.getDefault().unregister(this);
}
//事件接收
@Subscribe
public void onEvent(Integer count){    
resultTv.setText(String.valueOf(count));   
 Toast.makeText(getContext(), "传递数据成功", Toast.LENGTH_SHORT).show();
}