Android线程间通信--- eventbus3.0的简单使用

• 由greenrobot组织贡献(该组织还贡献了greenDAO),一个Android事件发布/订阅轻量级框架,
  功能:通过解耦发布者和订阅者简化Android事件传递
  EventBus可以代替Android传统的Intent,Handler,Broadcast或接口函数,在Fragment,Activity,Service线程之间传递数据，执行方法。
  特点:代码简洁，是一种发布订阅设计模式(观察者设计模式)。

参考了大牛的博客:

刘望舒: 

Android事件总线（一）EventBus3.0用法全解析

启舰：

EventBus使用详解(一)——初步使用EventBus

1.添加依赖

Android Studio 配置的module的gradle内：

compile 'org.greenrobot:eventbus:3.0.0'

2.定义一个消息事件，

public class User {    private String name;    private String pass;    public User(String name, String pass) {        this.name = name;        this.pass = pass;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPass() {        return pass;    }    public void setPass(String pass) {        this.pass = pass;    }    @Override    public String toString() {        return "User{" +                "name='" + name + '\'' +                ", pass='" + pass + '\'' +                '}';    }}

一,普通事件(a--->b---值-->a),相当于数据回传

具体的实践:

1.注册和取消订阅事件

PuTong1Activity 中注册和取消订阅事件（PuTong1Activity .java）：

public class PuTong1Activity extends AppCompatActivity implements View.OnClickListener {    private Button putong1_btn;    private TextView putong1Text;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_pu_tong1);        initView();        //注册事件        EventBus.getDefault().register(this);    }    private void initView() {        putong1_btn = (Button) findViewById(R.id.putong1_btn);        putong1Text = (TextView) findViewById(R.id.putong1Text);        putong1_btn.setOnClickListener(this);    }    @Override    public void onClick(View v) {        startActivity(new Intent(PuTong1Activity.this,PuTong2Activity.class));    }   //事件订阅者处理事件    @Subscribe(threadMode = ThreadMode.MAIN)    public void onMoonEvent(User user){        putong1Text.setText(user.getName()+"---接收到的值----"+user.getPass());    }    @Override    protected void onDestroy() {        super.onDestroy();        //取消注册事件        EventBus.getDefault().unregister(this);    }}

2.事件发布者发布事件PuTong2Activity 类

public class PuTong2Activity extends AppCompatActivity implements View.OnClickListener {    private Button putong2_btn;    private EditText nameEdit;    private EditText passEdit;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_pu_tong2);        initView();    }    private void initView() {        putong2_btn = (Button) findViewById(R.id.putong2_btn);        nameEdit = (EditText) findViewById(R.id.nameEdit);        passEdit = (EditText) findViewById(R.id.passEdit);        putong2_btn.setOnClickListener(this);    }    @Override    public void onClick(View v) {        String nameStr = nameEdit.getText().toString().trim();        String passStr = passEdit.getText().toString().trim();        //普通时间发送消息给putong1用post方法        EventBus.getDefault().post(new User(nameStr,passStr));        finish();    }}

二.粘性事件（相当于直接从a—值—>b,与intent跳转传值类似）

具体的实践:

1.发送黏性事件(MainActivity .java)

public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private EditText nameEdit;    private EditText passEdit;    private Button login;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        nameEdit = (EditText) findViewById(R.id.name);        passEdit = (EditText) findViewById(R.id.pass);        login = (Button) findViewById(R.id.login);        login.setOnClickListener(this);    }    @Override    public void onClick(View v) {        String nameStr = nameEdit.getText().toString().trim();        String passStr = passEdit.getText().toString().trim();        if(null==nameStr&&nameStr.equals("")||null==passStr&&passStr.equals("")){            Toast.makeText(this,"用户名密码不能为空",Toast.LENGTH_SHORT).show();        }else{            //2.发送消息粘性事件用postSticky            EventBus.getDefault().postSticky(new User(nameStr,passStr));            //跳转            Intent intent = new Intent(MainActivity.this, ResultActivity.class);            startActivity(intent);        }    }}

2.订阅粘性事件(ResultActivity.java)

public class ResultActivity extends AppCompatActivity implements View.OnClickListener {    private Button getResult;    private TextView text;    private String nameStr;    private String passStr;    //在接收消息的页面  注册EventBus    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_result);        initView();    }    private void initView() {        getResult = (Button) findViewById(R.id.getResult);        text = (TextView) findViewById(R.id.text);        getResult.setOnClickListener(this);    }    @Override    public void onClick(View v) {        //注册EventBus        EventBus.getDefault().register(this);    }    //订阅者处理粘性事件    @Subscribe(threadMode = ThreadMode.MAIN,sticky = true)    public void onEventMainThread(User user) {        String msg = "账号：" + user.getName()+"---密码:"+user.getPass();        Log.d("ResultActivity", msg);        text.setText(msg);        Toast.makeText(ResultActivity.this, msg, Toast.LENGTH_LONG).show();    }    @Override    protected void onDestroy() {        super.onDestroy();        //取消注册        EventBus.getDefault().unregister(this);    }}

就到这了.........