简单使用EventBus

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compile 'org.greenrobot:eventbus:3.1.1'

MessageEvent

package app.my.com.eventbus;/** * Created by lenovo on 2017/11/29. */public class MessageEvent {    public boolean tag;    public MessageEvent(boolean tag){        this.tag = tag;    }    public boolean isTag() {        return tag;    }    public void setTag(boolean tag) {        this.tag = tag;    }}

MainActivity

package app.my.com.eventbus;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.Toast;import org.greenrobot.eventbus.EventBus;import org.greenrobot.eventbus.Subscribe;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button bt1 = findViewById(R.id.bt1);        bt1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startActivity(new Intent(MainActivity.this, Main2Activity.class));            }        });        EventBus.getDefault().register(this);    }    @Subscribe    public void onMessageEvent(MessageEvent event) {        System.out.println("event MainActivity = " + event.isTag());        Toast.makeText(this, "message--------1", Toast.LENGTH_SHORT).show();    }    @Override    protected void onDestroy() {        super.onDestroy();        EventBus.getDefault().unregister(this);    }}

Main2Activity

package app.my.com.eventbus;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.Toast;import org.greenrobot.eventbus.EventBus;import org.greenrobot.eventbus.Subscribe;public class Main2Activity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);        Button bt2 = findViewById(R.id.bt2);        bt2.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startActivity(new Intent(Main2Activity.this,Main3Activity.class));            }        });        EventBus.getDefault().register(this);    }    @Subscribe    public void onMessageEvent(MessageEvent event){        System.out.println("event Main2Activity = " + event.isTag());        Toast.makeText(this, "message--------2", Toast.LENGTH_SHORT).show();    }}

Main3Activity

package app.my.com.eventbus;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import org.greenrobot.eventbus.EventBus;public class Main3Activity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);        Button bt3 = findViewById(R.id.bt3);        bt3.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                EventBus.getDefault().post(new MessageEvent(true));            }        });    }}

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