EventBus粘性事件

//先导依赖

compile 'org.greenrobot:eventbus:3.0.0'

//一个消息的实体类也就是Bean类

public class EventBusStickMessage {
    public String Message;

    public EventBusStickMessage(String message) {
        Message = message;
    }
}

//发送者的Activity

public class MainActivity extends AppCompatActivity {
String   s="我是最帅的";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
    public  void send(View  view){
        EventBus.getDefault().postSticky(new EventBusStickMessage(s) );
      startActivity( new Intent(this,ShowActivity.class));
    }


}

//发送者Activity的布局

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:onClick="send"
        android:text="向主页面使用EventBus发送一个事件"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

RelativeLayout>

//接受者的Activity

 

public class ShowActivity extends AppCompatActivity implements View.OnClickListener {

    /**
     * 接受一个粘性事件事件
     */
    private Button mBtn;
    /**
     * wret
     */
    private TextView mText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show);
        initView();

    }

    private void initView() {
        mBtn = (Button) findViewById(R.id.btn);
        mBtn.setOnClickListener(this);
        mText = (TextView) findViewById(R.id.text);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn:
                //判断如果已经注册过了，那就不注册了，如果不做判断那么就会报一个已经注册过的错误，程序也会崩溃
                if(!EventBus.getDefault ().isRegistered (this)){
                    EventBus.getDefault ().register(this);
                }
                break;
        }

    }
    //接收值  粘性事件必须要加的参数sticky = true
    @Subscribe(threadMode = ThreadMode.MAIN,sticky = true)
    public void request(EventBusStickMessage eMessage){
        mText.setText (eMessage.Message);
    }
    @Override
    protected void onDestroy() {
        super.onDestroy ();
        //移除所有的粘性事件
        EventBus.getDefault ().removeAllStickyEvents ();
        //取消注册
        EventBus.getDefault ().unregister (this);
    }

}

//接受者的布局

<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.eventbus__nianxingshijian.ShowActivity">
    <Button
             android:id="@+id/btn"
        android:text="接受一个粘性事件事件"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/text"
        android:text="wret"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
LinearLayout>