Android 简单EventBus登录界面与传值（粘性事件）

展示效果

添加EventBus导入依赖

compile 'org.greenrobot:eventbus:3.0.0'
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主MainActivity方法

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));            }        });    }}
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主MainBctivity方法

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());    }}
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UserEvent（事件类）

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 + '\'' +                '}';    }}
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activity_main（MainActivity的布局）

<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>
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activity_main_bctivity（MainBctivity的布局）

<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" />
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