liveDataBus使用篇

在工程的build.gradle配置

allprojects {
    repositories {
        google()
        jcenter()

        maven { url 'https://jitpack.io' }
    }
}

在model的build.gradle配置

dependencies {

implementation 'com.github.zhudaihao:livedatbus-master:1.0.1'

}

现在就可以愉快的开始玩耍了

我创建三个activity：MainActivity负责发送消息（全部订阅者都可以接受和创建后的订阅的接）；TextAllActivity和TextCreationActivity在消息发送后才创建订阅的；

MainActivity对应的xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="sendAll"
        android:text="发布所有订阅者"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="sendCreation"
        android:text="发布创建的订阅者"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</LinearLayout>

代码很简单就两个按钮，对应MainActivity代码

public class MainActivity extends AppCompatActivity {

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


    }

    /**
     * 发布给 所有订阅者
     *
     * @param view
     */
    public void sendAll(View view) {
        HomeBean homeBean = new HomeBean("张三");
        LiveDataBus.getDefault().with("homebean", HomeBean.class).postValue(homeBean);

        startActivity(new Intent(this,TextAllActivity.class));
    }


    /**
     * 发布给 创建的订阅者
     *
     * @param view
     */
    public void sendCreation(View view) {
        HomeBean homeBean = new HomeBean("李四");
        LiveDataBus.getDefault().withCreation("homebean", HomeBean.class).postValue(homeBean);

        startActivity(new Intent(this,TextCreationActivity.class));
    }

}

//TextAllActivity的XML代码就一个按钮就不写了，看看Java代码

/**
 * 测试 在发送后 订阅的用户
 */
public class TextAllActivity extends AppCompatActivity {
    private Button button;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_all);
        button=findViewById(R.id.bt);



        //订阅
        LiveDataBus.getDefault().with("homebean", HomeBean.class).observe(this, new Observer<HomeBean>() {
            @Override
            public void onChanged(HomeBean homeBean) {
                //订阅结果回调
                button.setText(homeBean.getName());

            }
        });

    }


}

//TextCreationActivity的XML代码就一个按钮就不写了，看看Java代码

/**
 * 测试 在发送后 订阅的用户
 */
public class TextCreationActivity extends AppCompatActivity {
    private Button button;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_creation);
        button=findViewById(R.id.bt);

        //订阅
        LiveDataBus.getDefault().withCreation("homebean", HomeBean.class).observe(this, new Observer<HomeBean>() {
            @Override
            public void onChanged(HomeBean homeBean) {
                //订阅结果回调
                button.setText(homeBean.getName());
            }
        });

    }


}

效果如下

liveDataBus使用篇

这个我通过调用不同方法实现指定对象接收消息；

源码地址：https://github.com/zhudaihao/livedatbus-master