大家好,又见面了,我是你们的朋友全栈君。
AllJoyn Android开发案例-android跨设备调用方法
项目需要涉及AllJoyn开源物联网框架。前面主要了解了一些AllJoyn基本的概念,像总线,总线附件,总线对象,总线接口这样的概念,以及之间的关系和跨设备、平台的调用功能。项目最终的目的实现是,跨平台的方法调用如:windows调用android,以及对于设备事件的订阅功能。
入手的步骤:
1.实现android端的跨设备方法(自定义)调用案例-java
2.实现windows端的跨设备方法(自定义)调用案例-c
3.实现windows端和android端的跨设备方法调用案例-(window用C ,android用java)
4.结合实际项目实现跨平台、跨设备的方法调用和订阅功能
现阶段我们来尝试实现android端的跨设备方法(自定义)调用案例-java
上面一篇关于博客–AllJoyn Android开发的一般步骤,主要概念上描述了如何实现调用,这篇文章我们结合android代码实现,走一遍流程,加深理解和记忆。参考地址http://blog.csdn.net/jsjdtb356/article/details/51084886。
官网参考地址(很重要):https://allseenalliance.org/framework/documentation/develop/api-guide/core/java
开源代码(core API 很多实例-android studio可运行):https://allseenalliance.org/framework/download
step1:
新建android studio project,选择file/project structrue 设置好java sdk,android sdk,android ndk的路径。
step2:
添加两个库文件,一个是alljoyn.jar库文件,一个是liballjoyn_java.so库文件,下载地址是https://allseenalliance.org/framework/download。版本我下载的是15.04,如下图。
我的.jar的绝对路径:G:alljoynalljoyn-androidcorealljoyn-15.04.00b-reljavajaralljoyn.jar
我的.so的绝对路径:G:alljoynalljoyn-androidcorealljoyn-15.04.00b-reljavalibliballjoyn_java.so
大家根据自己的解压位置去找就好了。
添加到工程后如下图所示:
project视图下,添加的路径和文件夹名称,没有文件夹则建立对应名称的文件夹。然后将jar添加作库。
step3:
实现流程 大致画一个示意图:
server代码实现:一个activity用于交互,button开启一个service;service中具体实现alljoyn代码;一个总线接口,总线对象要实现的接口;service上代码如下。
代码语言:javascript复制package com.example.siemens.testgetmethod;
import android.app.Service;
import android.content.Intent;
import android.net.wifi.WifiConfiguration;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.widget.Toast;
import org.alljoyn.bus.BusAttachment;
import org.alljoyn.bus.BusObject;
import org.alljoyn.bus.Mutable;
import org.alljoyn.bus.SessionOpts;
import org.alljoyn.bus.SessionPortListener;
import org.alljoyn.bus.Status;
import javax.net.ssl.SSLEngineResult;
public class MyService extends Service {
private final String TAG="MyService";
public MyService() {
// super();
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
// throw new UnsupportedOperationException("Not yet implemented");
return null;
}
public int onStartCommand(Intent intent, int flags, int startId) {
// Log.i(TAG, "onStartCommand()");
return START_STICKY;
}
public void onDestroy() {
// backgroundHandler.exit();
}
public void onCreate(){
Log.i(TAG,"onCreate method.");
//mbus初始化
mBus=new BusAttachment(getPackageName(),BusAttachment.RemoteMessage.Receive);
startBusThread();
if(backgroundHandler!=null)
backgroundHandler.connect();
else
return;
}
private void startBusThread(){
HandlerThread handlerThread=new HandlerThread("My HandlerThread");
handlerThread.start();
Looper loop=handlerThread.getLooper();
backgroundHandler=new BackgroundHandler(loop);
Log.i(TAG,"startBusThread method.");
}
//请求都在线程中执行
private BackgroundHandler backgroundHandler=null;
private final int CONNECT=2;
//私有内部不可变类
private final class BackgroundHandler extends Handler{
public BackgroundHandler(Looper looper){
super(looper);
}
public void connect(){
Log.i(TAG,"backgroundHandler.connect()");
Message msg=backgroundHandler.obtainMessage(CONNECT);//相当于message.what=2;
backgroundHandler.sendMessage(msg);
}
public void handleMessage(Message msg){
switch(msg.what){
case CONNECT:
doConnect();
break;
default:
break;
}
}
}
//创建总线附件对象,getPackageName()出现NullPointerException异常,先于构造函数执行,此时对象为null,所以放到oncreate里边去
// private BusAttachment mBus=new BusAttachment(getPackageName(),BusAttachment.RemoteMessage.Receive);
private BusAttachment mBus=null;
//创建总线对象
private MyBusObject myBusObject=new MyBusObject();
//总线对象类,实现总线接口和总线对象接口
class MyBusObject implements MyInterface,BusObject{
// public void show(String args){
// Toast.makeText(getApplicationContext(),args,Toast.LENGTH_SHORT).show(); //会调用的远程方法
//
// }
//
// public int add(int a,int b){ //会调用的远程方法
// return a b;
// }
public String cat(String a,String b){
a=a.replace('H','T');
b=b.replace('W','B');
return a b;
}
}
//session的端口号
private static final short CONTACT_PORT=42;
//总线对象,总线附件等连接到总线上的实现函数,创建的是service
private void doConnect(){
org.alljoyn.bus.alljoyn.DaemonInit.PrepareDaemon(getApplicationContext()); //启动守护进程
Status status=mBus.registerBusObject(myBusObject,"/myBusObject"); //注册总线对象
if (Status.OK != status) {
System.out.println("BusAttachment.registerBusObject() failed: " status);
System.exit(0);
return;
}
//总线附件连接到总线上
status=mBus.connect();
if (status != Status.OK) {
Log.i(TAG,"BusAttachment connect to bus failed.");
System.exit(0);
return;
}
//通信的session port 设置
Mutable.ShortValue contactPort = new Mutable.ShortValue(CONTACT_PORT);
SessionOpts sessionOpts = new SessionOpts();
sessionOpts.traffic = SessionOpts.TRAFFIC_MESSAGES;
sessionOpts.isMultipoint = false;
sessionOpts.proximity = SessionOpts.PROXIMITY_ANY;
sessionOpts.transports = SessionOpts.TRANSPORT_ANY;
//绑定通信的session port
status=mBus.bindSessionPort(contactPort,sessionOpts,new SessionPortListener(){
@Override
public boolean acceptSessionJoiner(short sessionPort, String joiner, SessionOpts sessionOpts){
if (sessionPort == CONTACT_PORT) {
return true;
} else {
return false;
}
}
});
if (status != Status.OK) {
Log.i(TAG,"bind certain session port failed.");
System.exit(0);
return;
}
//向总线请求一个名称
int flags = 0; //do not use any request name flags
status = mBus.requestName("com.test.well.known.name", flags);
if (status != Status.OK) {
Log.i(TAG,"request name from bus failed.");
System.exit(0);
return;
}
//在总线上宣告name的存在
status = mBus.advertiseName("com.test.well.known.name", SessionOpts.TRANSPORT_ANY);
if (status != Status.OK) {
Log.i(TAG,"advertise name on bus failed.");
mBus.releaseName("com.test.well.know.name");
System.exit(0);
return;
}else
Toast.makeText(getApplicationContext(),"advertise name=com.test.well.known.name",Toast.LENGTH_SHORT).show();
}
static{
System.loadLibrary("alljoyn_java");
}
}
注意:静态初始化块中的loadlibrary不能少掉。上面的例子参照的是chat源码。
接口代码:
代码语言:javascript复制package com.example.siemens.testgetmethod;
import org.alljoyn.bus.BusException;
import org.alljoyn.bus.annotation.BusInterface;
import org.alljoyn.bus.annotation.BusMethod;
/**
* Created by Siemens on 2016/4/8.
*/
@BusInterface (name = "org.my.interface.name")
public interface MyInterface {
// @BusMethod
// void show(String test) throws BusException;
// @BusMethod
// int add(int a,int b) throws BusException;
@BusMethod
String cat(String a,String b) throws BusException;
}
注意:格式必须按照这种格式来,上面接口的name属性后面的值很重要client要对应。
client代码如下:
代码语言:javascript复制package com.example.siemens.testgetmethodclient;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
import org.alljoyn.bus.BusAttachment;
import org.alljoyn.bus.BusListener;
import org.alljoyn.bus.Mutable;
import org.alljoyn.bus.ProxyBusObject;
import org.alljoyn.bus.SessionListener;
import org.alljoyn.bus.SessionOpts;
import org.alljoyn.bus.Status;
public class MyService extends Service {
private final String TAG="MyClientService";
public MyService() {
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
// throw new UnsupportedOperationException("Not yet implemented");
return null;
}
private BusAttachment mBus=null;
private static final short CONTACT_PORT=42;
//代理总线对象;接口对象
private ProxyBusObject mProxyObj;
public MyInterface mInterface;
// public MyInterface getmInterface(){
// return mInterface;
// }
//application对象
private ClientApplication mApplication;
@Override
public void onCreate(){
mApplication=(ClientApplication)getApplication();
//守护进程不能忘
org.alljoyn.bus.alljoyn.DaemonInit.PrepareDaemon(getApplicationContext()); //启动守护进程
mBus=new BusAttachment(getApplication().getPackageName(),BusAttachment.RemoteMessage.Receive);
//连接两次?
// Status status=mBus.connect();
// if (Status.OK != status) {
// Log.i(TAG,"client busattachment first connect to bus failed.");
// System.exit(0);
// return;
// }
mBus.registerBusListener(new BusListener(){
@Override
public void foundAdvertisedName(String name, short transport,String namePrefix){
mBus.enableConcurrentCallbacks();
short contactPort = CONTACT_PORT;
SessionOpts sessionOpts = new SessionOpts();
sessionOpts.traffic = SessionOpts.TRAFFIC_MESSAGES;
sessionOpts.isMultipoint = false;
sessionOpts.proximity = SessionOpts.PROXIMITY_ANY;
sessionOpts.transports = SessionOpts.TRANSPORT_ANY;
Mutable.IntegerValue sessionId = new Mutable.IntegerValue();
Status status = mBus.joinSession(name,contactPort,sessionId,sessionOpts,new SessionListener());
mProxyObj = mBus.getProxyBusObject("com.test.well.known.name", "/myBusObject", sessionId.value, new Class[]{MyInterface.class});
mInterface=mProxyObj.getInterface(MyInterface.class);
//personal add
mApplication.setTestInterface(mInterface);
}
});
//连接两次??官网API问题???
Status status=mBus.connect();
if (Status.OK != status) {
Log.i(TAG,"client busattachment second connect to bus failed.");
System.exit(0);
return;
}
//找到指定名称的busAttachment
status = mBus.findAdvertisedName("com.test.well.known.name");
if (status != Status.OK) {
Log.i(TAG,"client findAdvertisedName failed.");
System.exit(0);
return;
}
else
Toast.makeText(getApplicationContext(),"find name=com.test.well.known.name success.",Toast.LENGTH_SHORT).show();
}
static{
System.loadLibrary("alljoyn_java");
}
}
同时client端app也需要知道总线接口,但是要通过代理对象获得方法的具体实现,也要包含接口类,同server接口类。
总结:有4个client和server需要统一的地方。1.advertise的那个name,客户端是根据这个名称找server。2.接口类,server和client都要知道,server提供实现,client不知道具体实现。3.session设置的端口号,client的session port要和server统一。4.client要知道,server上总线对象在总线附件上注册的路径。
发布者:全栈程序员栈长,转载请注明出处:https://javaforall.cn/151688.html原文链接:https://javaforall.cn