EventBus使用

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//导入依赖

compile 'org.greenrobot:eventbus:3.1.1'

    在接受的方法里注册和反注册            //注册EventBus      EventBus.getDefault().register(this);            onDestory方法里反注册      EventBus.getDefault().unregister(this);//反注册EventBus                  在第二个Activity中进行post发送      //发送的msg是Object类型      EventBus.getDefault().post(Object);            //eventbus接收消息      //得有注解！！！  参数的发送的类型      @Subscribe      public void onEventMainThread(Object event) {          tv.setText(event.toString);      }

//详细代码
//MainActivity

    public class MainActivity extends AppCompatActivity {                private TextView tv;                @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.activity_main);              EventBus.getDefault().register(this);              Button btn= (Button) findViewById(R.id.btn);              tv = (TextView) findViewById(R.id.tv);              btn.setOnClickListener(new View.OnClickListener() {                  @Override                  public void onClick(View view) {                      Intent intent = new Intent(MainActivity.this, Main2Activity.class);                      startActivity(intent);                  }              });          }          @Subscribe          public void onEventMainThread(String event) {                       tv.setText(event);              //if (event != null) {            // String o= (String) event;            // if (o!= 0) {            // tv.setText(o);                     // }          //}       }        @Override protected void onDestroy() {              super.onDestroy();             EventBus.getDefault().unregister(this);        }            }

//Main2Activity

public class Main2Activity extends AppCompatActivity {[java] view plain copy        @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.activity_main2);              Button btn= (Button) findViewById(R.id.btn);              btn.setOnClickListener(new View.OnClickListener() {                  @Override                  public void onClick(View view) {                      EventBus.getDefault().post("你好");                  }              });          }      }

//Mian2Activity布局

    <RelativeLayout 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">          <Button              android:id="@+id/btn"              android:layout_below="@id/tv"              android:layout_width="match_parent"              android:layout_height="wrap_content" />      </RelativeLayout>

//MainActivity布局

    <RelativeLayout 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">                <TextView              android:id="@+id/tv"              android:layout_width="wrap_content"              android:layout_height="wrap_content"              android:text="Hello World!"              />         <Button             android:id="@+id/btn"             android:layout_below="@id/tv"             android:layout_width="match_parent"             android:layout_height="wrap_content" />      </RelativeLayout>

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