Evenbus普通事件，粘性事件

1.匯入依賴

compile 'org.greenrobot:eventbus:3.0.0'

2.訊息類

package com.bwie.tianmengjie20171106.evenbus;

/**
 * Created by T_baby on 17/11/07.
 */
//傳送資訊的實體類
public class FirstEvent {
    private String mMsg;
    public FirstEvent(String msg) {
        // TODO Auto-generated constructor stub
        mMsg = msg;
    }
    public String getMsg(){
        return mMsg;
    }
}

3.

package com.bwie.tianmengjie20171106.evenbus;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class MainActivity extends AppCompatActivity {
    Button btn,btn3;
    TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //註冊EventBus
        EventBus.getDefault().register(MainActivity.this);
        btn = (Button) findViewById(R.id.btn1);
        btn3 = (Button) findViewById(R.id.btn3);
        tv = (TextView)findViewById(R.id.tv);
        //非粘性事件
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(), Main2Activity.class);
                startActivity(intent);
            }
        });
        //粘性事件
        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EventBus.getDefault().postSticky(new FirstEvent("Hello,Everyone,my name is tianmengjie"));
                Intent intent = new Intent(getApplicationContext(), Main3Activity.class);
                startActivity(intent);
            }
        });
    }
    @Subscribe(threadMode = ThreadMode.MAIN,sticky = false)
    public void onEventMainThread(FirstEvent event) {
        String msg = "收到了訊息：" + event.getMsg();
        tv.setText(msg);
        Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
    }
    @Override
    protected void onDestroy(){
        super.onDestroy();
        EventBus.getDefault().unregister(this);//反註冊EventBus
    }
}

4.

package com.bwie.tianmengjie20171106.evenbus;

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;

public class Main2Activity extends AppCompatActivity {
    private Button btn2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        btn2 = (Button) findViewById(R.id.btn2);

        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EventBus.getDefault().post(new FirstEvent("Evenbus的普通事件"));
                finish();
            }
        });
    }
}

5.

package com.bwie.tianmengjie20171106.evenbus;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class Main3Activity extends AppCompatActivity {
    Button find;
    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        find = findViewById(R.id.find);
        textView = findViewById(R.id.main3text);
        find.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!EventBus.getDefault().isRegistered(Main3Activity.this)) {
                    EventBus.getDefault().register(Main3Activity.this);
                }
            }
        });
    }

    @Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
    public void getDate(FirstEvent first) {
        textView.setText("姓名：" + first.getMsg());
    }
}