android进阶：利用rxjava写一个超简单的bus

没时间解释了，快上车！

效果：每点击一下分别加一、加二

学习前提：

1、前提下有rxjava的简单知识。
2、了解：disposable（解除订阅）、PublishSubject（订阅时并不立即触发订阅事件）。
PublishSubject不懂可以看看这个文章：http://blog.csdn.net/qq1026291832/article/details/51006746

开车！！！

代码很简单，都没脸传资源了，掌握上面的知识可以马上开车！风格有点像EvenBus
核心类：DMRxBus

class DMRxBus {    private ConcurrentHashMap<Class, RxBusData> observableMap = new ConcurrentHashMap<>();    private static volatile DMRxBus instance;    private DMRxBus() {    }    /**     * 单例，线程一般安全     * @return DMRxBus     */    static DMRxBus getDefault() {        if (instance == null) {            synchronized (DMRxBus.class) {                if (instance == null) {                    instance = new DMRxBus();                }            }        }        return instance;    }    /**     * 注册     * @param classTag 消息类     * @param consumer 收到数据的回调     */    void register(@NonNull Class classTag,Consumer<Object> consumer) { //需要手动注册        System.out.println("register: "+classTag);        if (observableMap.get(classTag) == null) {            PublishSubject<Object> publishSubject = PublishSubject.create();            Disposable disposable = publishSubject.subscribe(consumer);            observableMap.put(classTag, new RxBusData(publishSubject,disposable));        }    }    /**     * 解除注册     * @param classTag 消息类     */    void unregister(@NonNull Class... classTag) {//解除这个页面所有注册        for (Class mClass:classTag) {            System.out.println("unregister: " + mClass);            if (observableMap.get(mClass) != null) {                observableMap.get(mClass).getDisposable().isDisposed();//解除注册            }            observableMap.remove(mClass);        }    }    /**     * 发送消息     * @param event 消息类     */    void post(@NonNull Object event) {        System.out.println("post: "+event.getClass());        if (observableMap.get(event.getClass()) != null) {            PublishSubject<Object> publishSubject = observableMap.get(event.getClass()).getPublishSubject();            if (publishSubject != null) {                publishSubject.onNext(event);            }        }    }    /**     * 清除所有订阅     */    void destroy() {        if (observableMap.isEmpty()) {            return;        }        for (RxBusData rxBusData:observableMap.values()){            rxBusData.getDisposable().dispose();        }        observableMap.clear();    }    /**     * 订阅的实体     */    private static class RxBusData{        PublishSubject<Object> publishSubject;        Disposable disposable;        RxBusData(PublishSubject<Object> publishSubject, Disposable disposable) {            this.publishSubject = publishSubject;            this.disposable = disposable;        }        PublishSubject<Object> getPublishSubject() {            return publishSubject;        }        Disposable getDisposable() {            return disposable;        }    }}

发送数据类，多少个都没问题：

//类一class MessageEvent1 {    private String msg;    MessageEvent1(String msg) {        this.msg = msg;    }    String getMsg() {        return msg;    }}//类二class MessageEvent2 {    private String msg;    MessageEvent2(String msg) {        this.msg = msg;    }    String getMsg() {        return msg;    }}

是用MainActivity来测试效果

public class MainActivity extends AppCompatActivity {    int count1 = 0;    int count2 = 0;    TextView msg1Tv;    TextView msg2Tv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        msg1Tv = (TextView) findViewById(R.id.msg1Tv);        msg2Tv = (TextView) findViewById(R.id.msg2Tv);        findViewById(R.id.sendBtn).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                DMRxBus.getDefault().post(new MessageEvent1(String.valueOf(++count1)));                DMRxBus.getDefault().post(new MessageEvent2(String.valueOf(count2+=2)));            }        });    }    @Override    protected void onStart() {        super.onStart();        DMRxBus.getDefault().register(MessageEvent1.class, new Consumer<Object>() {            @Override            public void accept(@NonNull Object o) throws Exception {                MessageEvent1 msg = (MessageEvent1) o;                msg1Tv.setText(msg.getMsg());            }        });        DMRxBus.getDefault().register(MessageEvent2.class, new Consumer<Object>() {            @Override            public void accept(@NonNull Object o) throws Exception {                MessageEvent2 msg = (MessageEvent2) o;                msg2Tv.setText(msg.getMsg());            }        });    }    @Override    protected void onStop() {        super.onStop();        DMRxBus.getDefault().unregister(MessageEvent1.class,MessageEvent2.class);    }    @Override    protected void onDestroy() {        super.onDestroy();        DMRxBus.getDefault().destroy();    }}

布局代码：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:orientation="vertical"    tools:context="com.dming.testdmbus.MainActivity">    <Button        android:id="@+id/sendBtn"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textAllCaps="false"        android:text="sendMsg"/>    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Msg:" />    <TextView        android:id="@+id/msg1Tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/msg2Tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>