Android实现EventBus登录界面与传值（粘性事件）

compile 'org.greenrobot:eventbus:3.0.0'

public class MainActivity extends AppCompatActivity {
 private EditText username,password;
 private Button btn_go;
 private List<UserEvent> mdata;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 mdata=new ArrayList<UserEvent>();
 username=(EditText)findViewById(R.id.username);
 password=(EditText)findViewById(R.id.passwork);
 btn_go=(Button)findViewById(R.id.btn_go);
 btn_go.setText("登录");
 btn_go.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
  String name = username.getText().toString().trim();
  String pass = password.getText().toString().trim();
  EventBus.getDefault().postSticky(new UserEvent(name,pass));
  startActivity(new Intent(MainActivity.this,MainBctivity.class));
  }
 });
 }
}

public class MainBctivity extends AppCompatActivity {
 private Button btn_shou;
 private TextView tv_b;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main_bctivity);
 btn_shou=(Button)findViewById(R.id.btn_shou);
 btn_shou.setText("接受参数");
 btn_shou.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
  if(!EventBus.getDefault().isRegistered(MainBctivity.this)){
   EventBus.getDefault().register(MainBctivity.this);
  }else{
   Toast.makeText(MainBctivity.this, "请勿重复注册事件", Toast.LENGTH_SHORT).show();
  }
  }
 });
 tv_b=(TextView)findViewById(R.id.tv_b);
 tv_b.setText("账号多少呢！");

 }

 @Override
 protected void onDestroy() {
 super.onDestroy();
 EventBus.getDefault().unregister(MainBctivity.this);
 }
 @Subscribe(threadMode = ThreadMode.POSTING,sticky = true)
 public void onMoonEvent(UserEvent userevent){
 tv_b.setText("账号："+userevent.getUsername()+"密码："+userevent.getPasswork());
 }
}

public class UserEvent {
 private String username;
 private String passwork;

 public UserEvent(String username, String passwork) {
 this.username = username;
 this.passwork = passwork;
 }

 public String getUsername() {
 return username;
 }

 public void setUsername(String username) {
 this.username = username;
 }

 public String getPasswork() {
 return passwork;
 }

 public void setPasswork(String passwork) {
 this.passwork = passwork;
 }

 public UserEvent() {
 }

 @Override
 public String toString() {
 return "UserEvent{" +
  "username='" + username + '\'' +
  ", passwork='" + passwork + '\'' +
  '}';
 }
}

<RelativeLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 <ImageView
  android:id="@+id/hh_img"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@mipmap/logo"
  android:layout_centerHorizontal="true"
  android:layout_marginTop="40dp"
  />
 <EditText
  android:id="@+id/username"
  android:layout_below="@id/hh_img"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="10dp"
  android:hint="用户名"
  />
 <EditText
  android:id="@+id/passwork"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_below="@id/username"
  android:layout_marginTop="10dp"
  android:hint="密码"
  />
 <Button
  android:id="@+id/btn_go"
  android:layout_below="@id/passwork"
  android:layout_marginTop="10dp"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  />
 <TextView
  android:id="@+id/new_user"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_below="@id/btn_go"
  android:text="新用户"
  android:layout_marginTop="5px"
  />
 </RelativeLayout>

<Button
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignParentTop="true"
 android:layout_centerHorizontal="true"
 android:layout_marginTop="20dp"
 android:id="@+id/btn_shou" />

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_below="@+id/btn_shou"
 android:layout_centerHorizontal="true"
 android:layout_marginTop="32dp"
 android:id="@+id/tv_b" />