转载请注明出处：https://blog.csdn.net/mr_leixiansheng/article/details/79898864
不详解，只介绍用法（包括主线程调用EventBus，子线程调用EventBus）
步骤：
1、需要接收事件处注册EventBus，如在Main中注册
EventBus.getDefault().register(this);
2、新建事件类
3、需要发送事件发送发送事件，如SecondActivity中发送
EventBus.getDefault().post(new SecondFButtonClickEvent(mEtInput.getText().toString()));
4、需要接收事件处注册实现事件接收（需要手动打出来，注意@Subscribe注释）
@Subscribe
public void onEvent(SecondFButtonClickEvent event) {
// UI updates must run on MainThread
mTextView.setText(event.msg);
}*子线程中返回的时间需要在主线程中操作时需要声明位置
@Subscribe(threadMode = ThreadMode.MAIN)
代码如下：1、事件接收处
package com.example.leixiansheng.eventbustest;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import butterknife.BindView;
import butterknife.ButterKnife;
public class MainActivity extends AppCompatActivity {
@BindView(R.id.button)
Button mButton;
@BindView(R.id.textView)
TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
EventBus.getDefault().register(this);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this,SecondActivity.class));
}
});
mTextView.setText("等待EventBus回传");
}
@Subscribe
public void onEvent(SecondFButtonClickEvent event) {
// UI updates must run on MainThread
mTextView.setText(event.msg);
}
@Subscribe
public void onEvent(SecondOnCreateEvent event) {
Log.i("TAG",event.msg);
}
@Subscribe
public void onEvent(SecondOnDestroyEvent event) {
Log.i("TAG",event.msg);
}
@Override
protected void onDestroy() {
super.onDestroy();
EventBus.getDefault().unregister(this);
}
}
布局
<?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:orientation="vertical"
tools:context="com.example.leixiansheng.eventbustest.MainActivity">
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
2、事件发送处
package com.example.leixiansheng.eventbustest;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;
import java.util.Timer;
import java.util.TimerTask;
import butterknife.BindView;
import butterknife.ButterKnife;
/**
* Created by Leixiansheng on 2018/4/9.
*/
public class SecondActivity extends AppCompatActivity {
@BindView(R.id.btn_back)
Button mBtnBack;
@BindView(R.id.et_input)
EditText mEtInput;
@BindView(R.id.btn_thread)
Button mBtnThread;
@BindView(R.id.iv_cover)
ImageView mIvCover;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
ButterKnife.bind(this);
EventBus.getDefault().register(this);
EventBus.getDefault().post(new SecondOnCreateEvent("second onCreate"));
mBtnBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String str = mEtInput.getText().toString();
boolean isStrEmpty = str.isEmpty() || (str.length() < 0);
if (isStrEmpty) {
Toast.makeText(SecondActivity.this,"请输入返回内容",Toast.LENGTH_SHORT).show();
return;
}
Toast.makeText(SecondActivity.this,"已经返回数据到主页面",Toast.LENGTH_SHORT).show();
//通过EventBus.getDefault().post();向主页传输数据
EventBus.getDefault().post(new SecondFButtonClickEvent(mEtInput.getText().toString()));
mBtnBack.setEnabled(false);
new Timer().schedule(new TimerTask() {
@Override
public void run() {
finish();
}
},1000);
}
});
mBtnThread.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(2000);
EventBus.getDefault().post(new RefreshCoverEvent(R.mipmap.ic_launcher));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
});
}
/**
* 子线程数据加载完成后在UI界面刷新时，需要选择threadMode
* @param event
*/
@Subscribe(threadMode = ThreadMode.MAIN)
public void onEvent(RefreshCoverEvent event) {
mIvCover.setImageResource(event.ivId);
}
@Override
protected void onDestroy() {
super.onDestroy();
EventBus.getDefault().post(new SecondOnCreateEvent("second onDestroy"));
EventBus.getDefault().unregister(this);
}
}
布局
<?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:orientation="vertical"
tools:context="com.example.leixiansheng.eventbustest.MainActivity">
<Button
android:id="@+id/btn_back"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="back"/>
<EditText
android:id="@+id/et_input"
android:layout_width="match_parent"
android:layout_height="100dp"
android:hint="请输入回传内容"
android:gravity="left"
android:textColorHint="#ffffffff"
android:background="#000000"
android:textColor="#ffffffff" />
<Button
android:id="@+id/btn_thread"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Create Thread"
android:textAllCaps="false"/>
<ImageView
android:id="@+id/iv_cover"
android:layout_gravity="center"
android:layout_width="100dp"
android:layout_height="100dp" />
</LinearLayout>
3、自定义的事件类
package com.example.leixiansheng.eventbustest;
/**
* Created by Leixiansheng on 2018/4/9.
*/
public class SecondFButtonClickEvent {
public String msg;
public SecondFButtonClickEvent(String msg) {
this.msg = msg;
}
}
package com.example.leixiansheng.eventbustest;
/**
* Created by Leixiansheng on 2018/4/9.
*/
public class SecondOnCreateEvent {
public String msg;
public SecondOnCreateEvent(String msg) {
this.msg = msg;
}
}
package com.example.leixiansheng.eventbustest;
/**
* Created by Leixiansheng on 2018/4/9.
*/
public class SecondOnDestroyEvent {
public String msg;
public SecondOnDestroyEvent(String msg) {
this.msg = msg;
}
}
Log打印信息如下
04-11 16:14:29.411 27433-27433/com.example.leixiansheng.eventbustest I/TAG: second onCreate
04-11 16:15:18.991 27433-27433/com.example.leixiansheng.eventbustest I/TAG: second onDestroy
详解可参考一下网址https://blog.csdn.net/itachi85/article/details/52205464
