Android 片段A通知片段B

我在FragA中有一个函数1，在FragB中有一个函数2 我想要的是：当FragA使用function1时，它应该通知FragB使用functionB

那么，什么是最简单、最好的方法呢

---

感谢func1使用FragmentManager.findFragmentByTag（或byId）查找B片段，然后对该片段调用函数

---

或者，您可以使用第三方甚至总线，例如func1中的

，使用FragmentManager.findFragmentByTag（或byId）查找B片段，然后对该片段调用函数

---

或者您可以使用第三方甚至总线，如

1。使用事件总线

使用EventBus将事件发送到另一个片段。你可以试试看

2。使用FragmentManager和公共方法（我不喜欢这些）

正如@Alexander所建议的，您可以获取对另一个片段的引用并调用其方法

3。使用广播

---

您可以使用LocalBroadcast并在两个片段中附加一个接收器，以便在它们接收广播时调用该方法。

1。使用事件总线

使用EventBus将事件发送到另一个片段。你可以试试看

2。使用FragmentManager和公共方法（我不喜欢这些）

正如@Alexander所建议的，您可以获取对另一个片段的引用并调用其方法

3。使用广播

---

您可以使用LocalBroadcast并在两个片段中附加一个接收器，以便在它们接收广播时调用该方法。

下面是您的问题的示例，虽然它的代码非常粗糙，但可以让您了解如何实现您的需求

您的活动应该如下FragmentTestOneActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;

import test.spinner.one.FragmentA;
import test.spinner.one.FragmentB;

public class FragmentTestOneActivity extends AppCompatActivity implements FragmentA.MyEventMaker{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment_test_one);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


    }

    @Override
    public void sendData(String text) {
        Log.d("FragmentTestOneActivity", "Text: "+text);
        FragmentB.setData(text);
    }
}

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

/**
 * A simple {@link Fragment} subclass.
 */
public class FragmentA extends Fragment {

    private MyEventMaker myEventMaker;
    private Button button;

    public FragmentA() {
        // Required empty public constructor
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        myEventMaker = (MyEventMaker)context;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_, container, false);
        button = (Button) view.findViewById(R.id.FragmentA_button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myEventMaker.sendData("something");
            }
        });
        return view;
    }

    public interface MyEventMaker{
        void sendData(String text);
    }
}

下面是上述活动的布局活动_片段_测试_one.xml

<?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"
    android:background="#cf5f5b"
    android:orientation="horizontal"
    android:padding="10dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="some.fragment.one.FragmentTestOneActivity"
    tools:showIn="@layout/activity_fragment_test_one">

    <fragment
        android:id="@+id/fragment_one"
        android:name="test.spinner.one.FragmentA"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_" />

    <fragment
        android:id="@+id/fragment_two"
        android:name="test.spinner.one.FragmentB"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_b" />
</LinearLayout>

<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:gravity="center"
    android:background="#b1a2f3"
    tools:context="test.spinner.one.FragmentA">

    <Button
        android:id="@+id/FragmentA_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button" />
</LinearLayout>

<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:background="#efabca"
    android:gravity="center"
    tools:context="test.spinner.one.FragmentB">

    <TextView
        android:id="@+id/FragmentB_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

fragment_a.xml

<?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"
    android:background="#cf5f5b"
    android:orientation="horizontal"
    android:padding="10dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="some.fragment.one.FragmentTestOneActivity"
    tools:showIn="@layout/activity_fragment_test_one">

    <fragment
        android:id="@+id/fragment_one"
        android:name="test.spinner.one.FragmentA"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_" />

    <fragment
        android:id="@+id/fragment_two"
        android:name="test.spinner.one.FragmentB"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_b" />
</LinearLayout>

<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:gravity="center"
    android:background="#b1a2f3"
    tools:context="test.spinner.one.FragmentA">

    <Button
        android:id="@+id/FragmentA_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button" />
</LinearLayout>

<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:background="#efabca"
    android:gravity="center"
    tools:context="test.spinner.one.FragmentB">

    <TextView
        android:id="@+id/FragmentB_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

fragment_b.xml

<?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"
    android:background="#cf5f5b"
    android:orientation="horizontal"
    android:padding="10dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="some.fragment.one.FragmentTestOneActivity"
    tools:showIn="@layout/activity_fragment_test_one">

    <fragment
        android:id="@+id/fragment_one"
        android:name="test.spinner.one.FragmentA"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_" />

    <fragment
        android:id="@+id/fragment_two"
        android:name="test.spinner.one.FragmentB"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_b" />
</LinearLayout>

<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:gravity="center"
    android:background="#b1a2f3"
    tools:context="test.spinner.one.FragmentA">

    <Button
        android:id="@+id/FragmentA_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button" />
</LinearLayout>

<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:background="#efabca"
    android:gravity="center"
    tools:context="test.spinner.one.FragmentB">

    <TextView
        android:id="@+id/FragmentB_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

---

以下是您问题的示例，虽然它的代码非常粗糙，但可以让您了解如何实现您的需求

您的活动应该如下FragmentTestOneActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;

import test.spinner.one.FragmentA;
import test.spinner.one.FragmentB;

public class FragmentTestOneActivity extends AppCompatActivity implements FragmentA.MyEventMaker{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment_test_one);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


    }

    @Override
    public void sendData(String text) {
        Log.d("FragmentTestOneActivity", "Text: "+text);
        FragmentB.setData(text);
    }
}

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

/**
 * A simple {@link Fragment} subclass.
 */
public class FragmentA extends Fragment {

    private MyEventMaker myEventMaker;
    private Button button;

    public FragmentA() {
        // Required empty public constructor
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        myEventMaker = (MyEventMaker)context;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_, container, false);
        button = (Button) view.findViewById(R.id.FragmentA_button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myEventMaker.sendData("something");
            }
        });
        return view;
    }

    public interface MyEventMaker{
        void sendData(String text);
    }
}

下面是上述活动的布局活动_片段_测试_one.xml

<?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"
    android:background="#cf5f5b"
    android:orientation="horizontal"
    android:padding="10dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="some.fragment.one.FragmentTestOneActivity"
    tools:showIn="@layout/activity_fragment_test_one">

    <fragment
        android:id="@+id/fragment_one"
        android:name="test.spinner.one.FragmentA"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_" />

    <fragment
        android:id="@+id/fragment_two"
        android:name="test.spinner.one.FragmentB"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_b" />
</LinearLayout>

<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:gravity="center"
    android:background="#b1a2f3"
    tools:context="test.spinner.one.FragmentA">

    <Button
        android:id="@+id/FragmentA_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button" />
</LinearLayout>

<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:background="#efabca"
    android:gravity="center"
    tools:context="test.spinner.one.FragmentB">

    <TextView
        android:id="@+id/FragmentB_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

fragment_a.xml

<?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"
    android:background="#cf5f5b"
    android:orientation="horizontal"
    android:padding="10dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="some.fragment.one.FragmentTestOneActivity"
    tools:showIn="@layout/activity_fragment_test_one">

    <fragment
        android:id="@+id/fragment_one"
        android:name="test.spinner.one.FragmentA"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_" />

    <fragment
        android:id="@+id/fragment_two"
        android:name="test.spinner.one.FragmentB"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_b" />
</LinearLayout>

<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:gravity="center"
    android:background="#b1a2f3"
    tools:context="test.spinner.one.FragmentA">

    <Button
        android:id="@+id/FragmentA_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button" />
</LinearLayout>

<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:background="#efabca"
    android:gravity="center"
    tools:context="test.spinner.one.FragmentB">

    <TextView
        android:id="@+id/FragmentB_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

fragment_b.xml

<?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"
    android:background="#cf5f5b"
    android:orientation="horizontal"
    android:padding="10dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="some.fragment.one.FragmentTestOneActivity"
    tools:showIn="@layout/activity_fragment_test_one">

    <fragment
        android:id="@+id/fragment_one"
        android:name="test.spinner.one.FragmentA"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_" />

    <fragment
        android:id="@+id/fragment_two"
        android:name="test.spinner.one.FragmentB"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dp"
        android:layout_weight="0.5"
        tools:layout="@layout/fragment_b" />
</LinearLayout>

<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:gravity="center"
    android:background="#b1a2f3"
    tools:context="test.spinner.one.FragmentA">

    <Button
        android:id="@+id/FragmentA_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button" />
</LinearLayout>

<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:background="#efabca"
    android:gravity="center"
    tools:context="test.spinner.one.FragmentB">

    <TextView
        android:id="@+id/FragmentB_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

您尝试过什么？您是否听说过

接口

？您尝试过什么？您听说过

接口

？