利用第三方开源项目 EventBus 进行通信

第三方的开源库EventBus同样提供了几乎无所不能、易于理解和使用的Android消息事件解决方案。在github上的项目主页地址：https://github.com/greenrobot/EventBus
下面只是一个简单的示例：

layout_main.xml 布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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"
tools:context="com.android.xo.MainActivity" >

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="" />

<Button
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/textView"
android:text="send"/>

</RelativeLayout>

定义一个 UContent 类：

package com.android.xo;

public class UContent {
public int id;
public String content;

@Override
public String toString() {

return content;
}
}

MainActivity.java ：

package com.android.xo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import de.greenrobot.event.EventBus;

public class MainActivity extends Activity {

TextView textView;
Button send;

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

textView = (TextView)findViewById(R.id.textView);
send = (Button)findViewById(R.id.send);

EventBus.getDefault().register(this);

send.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {

Intent intent = new Intent(MainActivity.this,
EventService.class);

startService(intent);

}
});
}
// EventBus回调接受消息
public void onEventMainThread(UContent event){
textView.setText(event + "");
}

@Override
protected void onDestroy() {
super.onDestroy();

Intent intent = new Intent(MainActivity.this,
EventService.class);
stopService(intent);

EventBus.getDefault().unregister(this);
}

}

EventService.java 类：

package com.android.xo;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import de.greenrobot.event.EventBus;

public class EventService extends Service {

public int id = 0;

@Override
public void onCreate() {
super.onCreate();

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

new Thread(){
@Override
public void run() {
for (int i = 0; i < 10; i++){

UContent event = new UContent();
event.id = id;
id ++;
event.content = "USB" + event.id;

try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}

EventBus.getDefault().post(event);
}
}}.start();

return super.onStartCommand(intent, flags, startId);
}

@Override
public IBinder onBind(Intent intent) {
return null;
}

}

AndroidManifest.xml 中注册：

<service android:name=".EventService"></service>