Android_EventBus

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代码块：

public class MainActivity extends AppCompatActivity {    EventBus bus;    ProgressBar progressBar;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        bus=EventBus.getDefault();        bus.register(this);        progressBar = (ProgressBar) findViewById(R.id.progressbar);    }    public void click(View view){        /*bus.post("我就是EventBus发送的消息");        */        Intent intent=new Intent(this,Main2Activity.class);        startActivity(intent);    }    @Subscribe(threadMode = ThreadMode.MAIN)    public void MyThread(String par){        Log.i("aaa","aa:"+par);        Toast.makeText(MainActivity.this,"第一个页面的："+par,Toast.LENGTH_SHORT).show();    }    @Override    protected void onDestroy() {        super.onDestroy();        bus.unregister(this);    }}

public class Main2Activity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);    }    public void click(View view){        EventBus.getDefault().post("我来了");        finish();    }}

布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"    android:layout_width="match_parent" android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:orientation="vertical"    tools:context="org.frxm.eventbus.MainActivity">    <ProgressBar        android:id="@+id/progressbar"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="150dp"        android:max="100"        android:progress="0"        style="?android:progressBarStyleHorizontal"/>    <Button        android:layout_width="wrap_content" android:layout_height="wrap_content"        android:text="发送消息"        android:onClick="click"/></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main2"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="org.frxm.eventbus.Main2Activity"><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:onClick="click"    android:text="发送"/></RelativeLayout>

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