Activity与Fragment如何通信

来源：互联网发布：下载搜狐新闻软件编辑：程序博客网时间：2024/04/29 19:59

概述：

Activity向Fragment传值在很多app中都有类似的使用，虽然现在的eventBus和RxBus都可以代替Activity向Fragment传值，但是这里还是要记录下，毕竟不是所有项目中都使用了EventBus或者RxBus。

核心:

发送数据：

//Activity传值，通过BundleBundle bundle = new Bundle();bundle.putString("MainActivity", "Hello,Fragment");//首先有一个Fragment对象 调用这个对象的setArguments(bundle)传递数据myFragment.setArguments(bundle);//点击按钮接受Fragment传回来的值btn_send.setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {    Bundle bundle = myFragment.getArguments();    String result = bundle.getString("MyFragment");    Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();    }});

接收数据：

//点击按钮接收Activity传过来的值btn_fragment.setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {    Bundle bundle = getArguments();    String result = bundle.getString("MainActivity");    Toast.makeText(getActivity(), result, Toast.LENGTH_LONG).show();    }});//Fragment回传值给ActivitygetArguments().putString("MyFragment", "Hello,Activity");

MainActivity.java:

public class MainActivity extends Activity {    private Button btn_send;    private MyFragment myFragment;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn_send = (Button)findViewById(R.id.button);        FragmentManager manager = getFragmentManager();        FragmentTransaction transation = manager.beginTransaction();        myFragment = new MyFragment();        transation.add(R.id.layout_container_fragment, myFragment);        transation.commit();        //Activity传值，通过Bundle        Bundle bundle = new Bundle();        bundle.putString("MainActivity", "Hello,Fragment");        //首先有一个Fragment对象 调用这个对象的setArguments(bundle)传递数据        myFragment.setArguments(bundle);        //点击按钮接受Fragment传回来的值        btn_send.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                Bundle bundle = myFragment.getArguments();                String result = bundle.getString("MyFragment");                Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();            }        });    }}

MyFragment.java:

public class MyFragment extends Fragment{    private Button btn_fragment;    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.activity_fragment, container, false);        btn_fragment = (Button)view.findViewById(R.id.button_fragment);        //点击按钮接收Activity传过来的值        btn_fragment.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                Bundle bundle = getArguments();                String result = bundle.getString("MainActivity");                Toast.makeText(getActivity(), result, Toast.LENGTH_LONG).show();            }        });        //Fragment回传值给Activity        getArguments().putString("MyFragment", "Hello,Activity");        return view;    }}

activity_main.java:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="10dp"    android:orientation="horizontal"     >    <Button        android:id="@+id/button"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_weight="1"        android:text="接收Fragmeng传回的值" />    <LinearLayout        android:id="@+id/layout_container_fragment"        android:layout_width="0dp"        android:layout_height="match_parent"        android:layout_weight="1"        android:background="#50ff"        android:orientation="vertical"        ></LinearLayout></LinearLayout>

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