Android中使用开源框架eventbus3.0实现fragment之间的通信交互

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="horizontal"
 tools:context="com.mly.panhouye.eventbustest.MainActivity">
 <LinearLayout
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:orientation="vertical"
 android:background="#6f6669">
 <Button
 android:layout_gravity="center_horizontal"
 android:id="@+id/panhouye"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="ŋ" />
 <Button
 android:layout_gravity="center_horizontal"
 android:id="@+id/bikonghai"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="̿պ" />
 <Button
 android:layout_gravity="center_horizontal"
 android:id="@+id/postSticky"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="ճДʂ" />
 </LinearLayout>
 <FrameLayout
 android:id="@+id/framelayout"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="2"></FrameLayout>
</LinearLayout>

<?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/tv"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:text="no data"
 android:textSize="50sp"
 android:gravity="center_horizontal"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main2"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
tools:context="com.mly.panhouye.eventbustest.Main2Activity">
 <TextView
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:textSize="30sp"
 android:gravity="center_horizontal"
 android:id="@+id/tv"
 android:text="no data"/>
</RelativeLayout>

package com.mly.panhouye.eventbustest;
/**
 * Created by panchengjia on 2017/2/19 0019.
 */
public class MessageEvent {
 String data;
 public MessageEvent(String data) {
 this.data = data;
 }
}

package com.mly.panhouye.eventbustest;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
 * Created by panchengjia on 2017/2/20 0020.
 */
public class MsgFragment extends Fragment {
 TextView tv;
 @Nullable
 @Override
 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
 View view = inflater.inflate(R.layout.fragment_msg,container,false);
 tv = (TextView) view.findViewById(R.id.tv);
 return view;
 }
 public void setText(String message){
 tv.setText(message);
 }
}

package com.mly.panhouye.eventbustest;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 Button panhouye,bikonghai,postSticky;
 MsgFragment msgFragment;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 panhouye= (Button) findViewById(R.id.panhouye);
 bikonghai= (Button) findViewById(R.id.bikonghai);
 postSticky= (Button) findViewById(R.id.postSticky);
 panhouye.setOnClickListener(this);
 bikonghai.setOnClickListener(this);
 postSticky.setOnClickListener(this);
 //添加fragment到右侧的帧布局中
 msgFragment = new MsgFragment();
 getSupportFragmentManager().beginTransaction().add(R.id.framelayout,msgFragment).commit();
 }
 /*个人建议在onResume注册EventBus
 *在可见可交互状态下注册，尽可能少的占用内存
 */
 @Override
 protected void onResume() {
 super.onResume();
 EventBus.getDefault().register(this);
 }
 /*个人建议在onPause注册EventBus(将当前Activity注册为事件订阅者)
 *不影响功能的情况下提早解除注册，尽可能少的占用内存
 */
 @Override
 protected void onPause() {
 super.onPause();
 EventBus.getDefault().unregister(this);
 }
 /**
 * 事件发布者(通过按钮点击事件进行事件发布)
 * @param v
 */
 @Override
 public void onClick(View v) {
 switch (v.getId()){
 //（1）事件发布中所传参数可以作为右侧fragment文本的修改内容
 //（2）事件发布中所传参数也可以用作事件订阅者执行方法的区分通知
 case R.id.panhouye:
 EventBus.getDefault().post(new MessageEvent("潘侯爷"));
 break;
 case R.id.bikonghai:
 EventBus.getDefault().post(new MessageEvent("碧空海"));
 break;
 case R.id.postSticky:
 //粘性事件发布
 EventBus.getDefault().postSticky(new MessageEvent("粘性事件"));
 startActivity(new Intent(this,Main2Activity.class));
 break;
 }
 }
 /**
 * 事件订阅者自定义的接收方法
 * @param event
 */
 @Subscribe(threadMode = ThreadMode.MAIN)
 public void onMessageEvent(MessageEvent event) {
// //（1）将事件发布者发布的数据作为文本修改内容
// msgFragment.setText(event.data);
 //（2）将事件发布者发布的数据作为方法执行的区分
 switch(event.data){
 case "潘侯爷":
 msgFragment.setText("panhouye");
 break;
 case "碧空海":
 msgFragment.setText("bikonghai");
 break;
 }
 }
}

package com.mly.panhouye.eventbustest;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;
public class Main2Activity extends AppCompatActivity {
 TextView tv;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main2);
 tv = (TextView) findViewById(R.id.tv);
 }
 @Override
 protected void onResume() {
 super.onResume();
 EventBus.getDefault().register(this);
 }
 @Override
 protected void onPause() {
 super.onPause();
 EventBus.getDefault().unregister(this);
 }
 @Subscribe(threadMode = ThreadMode.MAIN,sticky = true)
 public void onMessageEvent(MessageEvent event) {
// //（1）将事件发布者发布的数据作为文本修改内容
 tv.setText(event.data);
 //（2）将事件发布者发布的数据作为方法执行的区分
// switch(event.data){
// case "粘性事件":
// tv.setText("panhouye");
// break;
// }
 }
}

MessageEvent stickyEvent = EventBus.getDefault().getStickyEvent(MessageEvent.class);
// Better check that an event was actually posted before
if(stickyEvent != null) {
 // "Consume" the sticky event
 EventBus.getDefault().removeStickyEvent(stickyEvent);
 // Now do something with it
}
MessageEvent stickyEvent = EventBus.getDefault().removeStickyEvent(MessageEvent.class);
// Better check that an event was actually posted before
if(stickyEvent != null) {
 // Now do something with it
}