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("登錄"); 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("接受參數(shù)"); 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, "請勿重復(fù)注冊事件", Toast.LENGTH_SHORT).show();  }  } }); tv_b=(TextView)findViewById(R.id.tv_b); tv_b.setText("賬號多少呢！"); } @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("賬號："+userevent.getUsername()+"密碼："+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="用戶名"  /> <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="密碼"  /> <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="新用戶"  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" />