Android开发使用Messenger及Handler进行通信的方法示例
本文实例讲述了Android开发使用Messenger及Handler进行通信的方法。分享给大家供大家参考，具体如下：
1.客户端service
publicclassMessageServiceextendsService{
privatestaticfinalintMSG_SET_VALUE=0x110;
privateHandlermHandler=newHandler(){
publicvoidhandleMessage(MessagemsgFromClient){
//返回给客户的信息
MessagemsgToClient=Message.obtain(msgFromClient);
switch(msgFromClient.what){
//msg客户端传来的消息
caseMSG_SET_VALUE:
try{
msgToClient.what=MSG_SET_VALUE;
SystemClock.sleep(2000);
msgToClient.arg2=msgFromClient.arg1+msgFromClient.arg2;
//msgFromClient.replyTo.send(msgToClient);
//得到客户端的信使对象，并向它发送消息
cMessenger=msgFromClient.replyTo;
cMessenger.send(msgToClient);
}catch(RemoteExceptione){
e.printStackTrace();
}
break;
default:
break;
}
}
};
privateMessengermMessager=newMessenger(mHandler);
privateMessengercMessenger;
@Override
publicIBinderonBind(Intentintent){
returnmMessager.getBinder();
}
@Override
publicvoidonDestroy(){
cMessenger=null;
super.onDestroy();
}
}
2.服务器端service
publicclassMessageServiceextendsService{
privatestaticfinalintMSG_SET_VALUE=0x110;
privateHandlermHandler=newHandler(){
publicvoidhandleMessage(MessagemsgFromClient){
//返回给客户的信息
MessagemsgToClient=Message.obtain(msgFromClient);
switch(msgFromClient.what){
//msg客户端传来的消息
caseMSG_SET_VALUE:
try{
msgToClient.what=MSG_SET_VALUE;
SystemClock.sleep(2000);
msgToClient.arg2=msgFromClient.arg1+msgFromClient.arg2;
//msgFromClient.replyTo.send(msgToClient);
//得到客户端的信使对象，并向它发送消息
cMessenger=msgFromClient.replyTo;
cMessenger.send(msgToClient);
}catch(RemoteExceptione){
e.printStackTrace();
}
break;
default:
break;
}
}
};
privateMessengermMessager=newMessenger(mHandler);
privateMessengercMessenger;
@Override
publicIBinderonBind(Intentintent){
returnmMessager.getBinder();
}
@Override
publicvoidonDestroy(){
cMessenger=null;
super.onDestroy();
}
}
3.客户端使用
publicclassMainActivityextendsActivity{
privatestaticfinalintMSG_SET_VALUE=0x110;
privateTextViewmTVStatus;//连接状态
privateLinearLayoutmLLContainer;//用来添加接收到服务器返回的信息
privateMessengermService;//客户端信使
privatebooleanisConnecting;//是否连接
privateHandlermHandler=newHandler(){
publicvoidhandleMessage(MessagemsgFromServer){
switch(msgFromServer.what){
caseMSG_SET_VALUE:
TextViewtv=(TextView)findViewById(msgFromServer.arg1);
tv.setText(tv.getText()+"==>"+msgFromServer.arg2);
break;
}
super.handleMessage(msgFromServer);
};
};
privateMessengermMessenger=newMessenger(mHandler);
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTVStatus=(TextView)findViewById(R.id.tv_status);
mLLContainer=(LinearLayout)findViewById(R.id.ll_container);
}
inti=0;
publicvoidsend(Viewview){
try{
inta=i++;
intb=(int)(Math.random()*100);
//创建一个tv,添加到LinearLayout中
TextViewtv=newTextView(MainActivity.this);
tv.setText(a+"+"+b+"=caculating...");
tv.setId(a);
mLLContainer.addView(tv);
MessagemsgFromClient=Message.obtain(null,MSG_SET_VALUE,a,b);
msgFromClient.replyTo=mMessenger;
if(isConnecting){
//往服务端发送消息
mService.send(msgFromClient);
}
}catch(RemoteExceptione){
e.printStackTrace();
}
}
publicvoidbind(Viewview){
Intentservice=newIntent();
service.setAction("android.intent.action.MESSAGE_SERVER");
bindService(service,conn,Context.BIND_AUTO_CREATE);
}
privateServiceConnectionconn=newServiceConnection(){
@Override
publicvoidonServiceDisconnected(ComponentNamename){
mService=null;
isConnecting=false;
mTVStatus.setText("已断开连接！");
}
@Override
publicvoidonServiceConnected(ComponentNamename,IBinderservice){
mService=newMessenger(service);
isConnecting=true;
mTVStatus.setText("连接成功！");
}
};
publicvoidunbind(Viewview){
unbindService(conn);
conn=null;
}
@Override
protectedvoidonDestroy(){
unbindService(conn);
conn=null;
super.onDestroy();
}
}
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希望本文所述对大家Android程序设计有所帮助。