EventBus系列：EventBus3.0 简单使用

Posted 2021-06-12 zhangjin1120

上效果：

• 先引入EventBus依赖：

implementation 'de.greenrobot:eventbus:3.0.0-beta1'

• 需要接受信息的Acitivity, 注册EventBus，并在onDestroy()中解除。

public class MainActivity extends AppCompatActivity {
    TextView tvName;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EventBus.getDefault().register(this);  //注册EventBus
        tvName = findViewById(R.id.tv_name);
    }

    @Subscribe(threadMode = ThreadMode.MainThread)
    public void updateName(String name) {
        tvName.setText("姓名改为：" + name);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this); //解绑EventBus
    }

//点击“改名”
    public void toChangeNameActivity(View view) {
        Intent intent = new Intent();
        intent.setClass(this, ChangeNameActivity.class);
        startActivity(intent);
    }
}

• 发送消息的Activity,调用EventBus.getDefault().post("刘德华");，和View.post(runnable)相似。

public class ChangeNameActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_change_name);
    }

    public void changeName(View view) {
        EventBus.getDefault().post("刘德华");
        finish();
    }
}