Fragment间的通信

Fragment通信

主要说的是activity与fragment的数据传递、fragment与activity的数据传递和fragment与fragment之前的数据传递

一、activity与fragment之间的通信

采用 Bundle方式。具体Demo步骤如下：
   步骤1：Activity的布局文件act_to_fragment.xml
   步骤2：设置 Fragment的布局文件fragment_com.xml
   步骤3：设置Activity的类文件ActToFragment.java
   步骤4：设置Fragment的类文件fragment_com.java

1.activity页面文件

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".ActToFragment"     android:orientation="vertical">       <TextView         android:id="@+id/text"         android:layout_gravity="center"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textSize="20dp"         android:text="我是Activity" />       <FrameLayout         android:layout_below="@+id/button"         android:id="@+id/fragment_container"         android:layout_width="match_parent"         android:layout_height="500dp"/>   </LinearLayout>

　2.设置 Fragment的布局文件

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@color/colorAccent"     >       <TextView         android:id="@+id/com_vfa"         android:text="我是fragment"         android:layout_gravity="center"         android:textSize="30dp"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         />       <TextView         android:id="@+id/text"         android:layout_gravity="center"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textSize="20dp"         android:text="等待Activity发送消息" />       <Button         android:id="@+id/button"         android:layout_gravity="center"         android:text="点击接收Activity消息"         android:layout_centerInParent="true"         android:textSize="20dp"         android:layout_width="wrap_content"         android:layout_height="wrap_content" /> </LinearLayout>

　3.设置activity的类文件

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public class ActToFragment extends AppCompatActivity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.act_to_fragment);         FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();         //创建需要添加的fragment;         FragmentCom fragmentCom = new FragmentCom();         //创建bundle对象并将数据传递到fragment中去         Bundle bundle = new Bundle();         bundle.putString("message", "I love Google");         fragmentCom.setArguments(bundle);         transaction.add(R.id.fragment_container,fragmentCom);         transaction.commit();     } }

4.　fragment的类文件

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@Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        // Inflate the layout for this fragment        View view = inflater.inflate(R.layout.fragment_com, container, false);          TextView textView = (TextView) view.findViewById(R.id.text);          Button button = (Button) view.findViewById(R.id.button);          //通过getArguments获取bundle对象        Bundle bundle = this.getArguments();          button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                textView.setText(bundle.getString("message"));            }        });        return view;    }

二、fragment与activity的通信

fragment传递消息到activity
 1、定义接口
 2、实现接口
 3、消息传递
1.设置activity布局文件

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".FragmentToActActivity"     android:orientation="vertical"     >       <TextView         android:id="@+id/text_second"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textSize="20dp"         android:text="等待Fragment发送消息" />       <Button         android:id="@+id/button_second"         android:layout_below="@+id/text"         android:text="点击接收Fragment消息"         android:layout_centerInParent="true"         android:textSize="10dp"         android:layout_width="wrap_content"         android:layout_height="wrap_content" />       <FrameLayout         android:layout_below="@+id/selected"         android:id="@+id/fragment_container"         android:layout_width="match_parent"         android:layout_height="500dp"/>   </LinearLayout>

　　2.设置Fragment的布局文件

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent"     >       <TextView         android:id="@+id/fragment"         android:text="我是fragment"         android:gravity="center"         android:textSize="30dp"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:background="@color/colorAccent"/> </LinearLayout>

　　3.设置回调接口：ICallBack.java

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public interface ICallBack {       void getMessageFromFragment(String message); }

　　4.设置fragment的类文件

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@Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        // Inflate the layout for this fragment        return inflater.inflate(R.layout.fragment_com_sencond, container, false);    }        //实现定义的接口      public void sendMessage(ICallBack iCallBack){        iCallBack.getMessageFromFragment("我是来自fragment的消息");    }

　　5.设置activity的类文件

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public class FragmentToActActivity extends AppCompatActivity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_fragment_to_act);         TextView textView = (TextView) findViewById(R.id.text_second);           Button button = (Button) findViewById(R.id.button_second);           FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();           ComSencondFragment comSencondFragment = new ComSencondFragment();           transaction.add(R.id.fragment_container, comSencondFragment).commit();           button.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 comSencondFragment.sendMessage(new ICallBack() {                     @Override                     public void getMessageFromFragment(String message) {                         textView.setText(message);                     }                 });             }         });     } }