动态加载fragment和实现fragment 之间的通信

相信大家都用过网易云音乐吧，ios版的有如下的功能：
点击底部一个按钮就切换一个界面，利用fragmentlayout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <include layout="@layout/title"/>
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="11"
        android:id="@+id/frag">
    FrameLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1">

        <Button
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/left"
            android:layout_weight="1"
            android:gravity="center"
            android:text="left"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/another"
            android:layout_weight="1"
            android:gravity="center"
            android:text="another"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/right"
            android:layout_weight="1"
            android:gravity="center"
            android:text="right"/>

    LinearLayout>

LinearLayout>

新建的fragment类继承自Fragment（support。V4）

public class LeftFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.left_fragment,container,false);
        Button btn = (Button)view.findViewById(R.id.button);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                        RightFragment fragment = RightFragment.newInstance("hi");
                        FragmentTransaction transaction = getFragmentManager().beginTransaction();
                        transaction.add(R.id.frag,fragment);
                        transaction.commit();}
        });
        return view;
    }
}

MainActivity中的replaceFragment()功能是用传入的fragment填充入FagmentLyaout中

        FragmentManager fragmentManager = getSupportFragmentManager();
 Transaction transaction = fragmentManager.beginTransaction();
        transactiorag,fragment);
        tra);
    } ``` 

   本例中是leftfragment和rightment实现通信，首先在rightfragghtfrag法`shuju代码片`ment中写个传入数据的静态方法
   ```  public static RightFragment newInstance(String text){
        RightFragment rightFragment = new RightFragment();
        Bundle bundle = new Bundle();
        bundle.putString("HELLO",text);
        rightFragment.setArguments(bundle);
        return rightFragment;
    }```
    在leftfragment中写入数据

     RightFragment fragment = RightFragment.newInstance("hi");

“`的