Android中Service使用bindService
同个app间调用（只有一次启动该服务）
BinderActicityA
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
publicclassBinderActicityAextendsActivityimplementsView.OnClickListener{
privateButtonbtn1;
privateButtonbtn2;
privateButtonbtn3;
privateButtonbtn4;
privateBindServicebindService=null;
privatebooleanisBound=false;
privateServiceConnectionconn=newServiceConnection(){
@Override
publicvoidonServiceConnected(ComponentNamename,IBinderservice){
isBound=true;
BindService.MyBinderbinder=(BindService.MyBinder)service;
bindService=binder.getService();
intnum=bindService.getRandomNumber();
Log.v("hjz","numA="+num);
}
//client和service连接意外丢失时，会调用该方法
@Override
publicvoidonServiceDisconnected(ComponentNamename){
Log.v("hjz","onServiceDisconnectedA");
}
};
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_binder_main);
findLayoutView();
setLister();
initData();
}
privatevoidfindLayoutView(){
btn1=(Button)findViewById(R.id.btn1);
btn2=(Button)findViewById(R.id.btn2);
btn3=(Button)findViewById(R.id.btn3);
btn4=(Button)findViewById(R.id.btn4);
}
privatevoidsetLister(){
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
}
privatevoidinitData(){
}
@Override
publicvoidonClick(Viewv){
Intentintent=null;
switch(v.getId()){
caseR.id.btn1:
intent=newIntent(BinderActicityA.this,BindService.class);
intent.putExtra("from","ActivityA");
bindService(intent,conn,BIND_AUTO_CREATE);
break;
caseR.id.btn2:
if(isBound){
isBound=false;
Log.v("hjz","ActicityAisunbindService");
unbindService(conn);
}
break;
caseR.id.btn3:
intent=newIntent(this,BinderActivityB.class);
startActivity(intent);
break;
caseR.id.btn4:
this.finish();
break;
}
}
@Override
protectedvoidonDestroy(){
super.onDestroy();
Log.i("hjz","ActivityA->onDestroy");
}
}
xml
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
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"
android:orientation="vertical"
tools:context="com.hh.servicedemo.MainActivity">
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BinderService绑定"/>
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BinderService解绑"/>
android:id="@+id/btn3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转到BinderActivityB"/>
android:id="@+id/btn4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="finish"/>
BinderService
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
publicclassBindServiceextendsService{
publicclassMyBinderextendsBinder{
publicBindServicegetService(){
returnBindService.this;
}
}
//通过binder实现了调用者（client）与service之间的通信
privateMyBinderbinder=newMyBinder();
privatefinalRandomgenerator=newRandom();
@Override
publicvoidonCreate(){
super.onCreate();
Log.i("hjz","BindService->onCreate,Thread:"+Thread.currentThread().getName());
}
@Override
publicIBinderonBind(Intentintent){
Log.i("hjz","BindService->onBind,Thread:"+Thread.currentThread().getName());
returnbinder;
}
@Override
publicbooleanonUnbind(Intentintent){
Log.i("hjz","BindService->onUnbind,from:"+intent.getStringExtra("from"));
returnfalse;
}
@Override
publicintonStartCommand(Intentintent,intflags,intstartId){
Log.i("hjz","BindService->onStartCommand,startId:"+startId+",Thread:"+Thread.currentThread().getName());
returnSTART_NOT_STICKY;
}
@Override
publicvoidonDestroy(){
Log.i("hjz","BindService->onDestroy,Thread:"+Thread.currentThread().getName());
super.onDestroy();
}
//在Service中暴露出去的方法，供client调用
publicintgetRandomNumber(){
returngenerator.nextInt();
}
}
点击BinderService绑定，再点击BinderService解绑，最后点击finish，打印日志
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
07-0911:46:49.36029714-29714/com.hh.servicedemoI/hjz:BindService->onCreate,Thread:main
07-0911:46:49.36029714-29714/com.hh.servicedemoI/hjz:BindService->onBind,Thread:main
07-0911:46:49.38029714-29714/com.hh.servicedemoV/hjz:numA=1859239539
07-0911:46:50.65029714-29714/com.hh.servicedemoV/hjz:ActicityAisunbindService
07-0911:46:50.65029714-29714/com.hh.servicedemoI/hjz:BindService->onUnbind,from:ActivityA
07-0911:46:50.65029714-29714/com.hh.servicedemoI/hjz:BindService->onDestroy,Thread:main
07-0911:46:52.29029714-29714/com.hh.servicedemoI/hjz:ActivityA->onDestroy
点击BinderService绑定，再点击finish
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
07-0911:48:07.26029714-29714/com.hh.servicedemoI/hjz:BindService->onCreate,Thread:main
07-0911:48:07.26029714-29714/com.hh.servicedemoI/hjz:BindService->onBind,Thread:main
07-0911:48:07.27029714-29714/com.hh.servicedemoV/hjz:numA=-341510490
07-0911:48:09.29029714-29714/com.hh.servicedemoI/hjz:ActivityA->onDestroy
07-0911:48:09.31029714-29714/com.hh.servicedemoI/hjz:BindService->onUnbind,from:ActivityA
07-0911:48:09.31029714-29714/com.hh.servicedemoI/hjz:BindService->onDestroy,Thread:main
先从BinderService来分析，从打印可以看出，先调用onCreate，接着在调用onBind方法，你会发现使用binderStart来启动，onStartCommand这方法不调用；在Service中执行顺序：
1、先得到相应的binder对象，可以在Service内部用内部类得到相应的binder，如下所示：
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
publicclassMyBinderextendsBinder{
publicBindServicegetService(){
returnBindService.this;
}
}
//通过binder实现了调用者（client）与service之间的通信
privateMyBinderbinder=newMyBinder();
2、在onBind方法中返回IBinder实例，返回实例可以是Service实例本身或者通过binder暴露出Service公共方法。通常情况下，就是讲binder弄成Service内部类，然后在binder中创建一个类似getService的方法并返回包含binder的Service对象，如上面那种情况，这样client（客户端）可以通过该方法得到相应的Service实例
接着调用者（client客户端）执行的流程
1、先创建ServiceConnetion实例，并重写其方法，如下面所示：
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
//创建ServiceCowww.baiyuewang.netnnection类型的实例
privateServiceConnectionconn=newServiceConnection(){
@Override
publicvoidonServiceConnected(ComponentNamename,IBinderservice){
isBound=true;
BindService.MyBinderbinder=(BindService.MyBinder)service;
bindService=binder.getService();
intnum=bindService.getRandomNumber();
Log.v("hjz","numA="+num);
}
//client和service连接意外丢失时，会调用该方法
@Override
publicvoidonServiceDisconnected(ComponentNamename){
Log.v("hjz","onServiceDisconnectedA");
}
};
这是因为使用bindServer中使用到该对象，bindServer源码
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
@Override
publicbooleanbindService(Intentservice,ServiceConnectionconn,
intflags){//调用bindServer，发现第二个传参就是ServiceConnection对象
returnmBase.bindService(service,conn,flags);
}
2、当执行了onServiceConnected回调时，我们可以通过IBinder实例得到Service实例对象或直接调用binder公共方法，这样就实现了client和service的连接
3、client和Service解除绑定时，onServiceDisconnected并不会被调用；onServiceDisconnected被调用的情况是发生在client和Service连接意外丢失时，这时client和Service一定是断开连接了。
同个app间调用（多次调用该服务）
BinderAcivityB
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
publicclassBinderActivityBextendsActivityimplementsView.OnClickListener{
privateButtonbtn1;
privateButtonbtn2;
privateButtonbtn4;
privateBindServicebindService=null;
privatebooleanisBound=false;
privateServiceConnectionconn=newServiceConnection(){
@Override
publicvoidonServiceConnected(ComponentNamename,IBinderservice){
isBound=true;
BindService.MyBinderbinder=(BindService.MyBinder)service;
bindService=binder.getService();
intnum=bindService.getRandomNumber();
Log.v("hjz","numB="+num);
}
@Override
publicvoidonServiceDisconnected(ComponentNamename){
Log.v("hjz","onServiceDisconnectedB");
}
};
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_binder_b);
findLayoutView();
setLister();
initData();
}
privatevoidfindLayoutView(){
btn1=(Button)findViewById(R.id.btn1);
btn2=(Button)findViewById(R.id.btn2);
btn4=(Button)findViewById(R.id.btn4);
}
privatevoidsetLister(){
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn4.setOnClickListener(this);
}
privatevoidinitData(){
}
@Override
publicvoidonClick(Viewv){
Intentintent=null;
switch(v.getId()){
caseR.id.btn1:
intent=newIntent(BinderActivityB.this,BindService.class);
intent.putExtra("from","ActivityB");
bindService(intent,conn,BIND_AUTO_CREATE);
break;
caseR.id.btn2:
if(isBound){
isBound=false;
Log.v("hjz","ActicityBisunbindService");
unbindService(conn);
}
break;
caseR.id.btn4:
this.finish();
break;
}
}
@Override
protectedvoidonDestroy(){
super.onDestroy();
Log.i("hjz","ActivityB->onDestroy");
}
}
在binderA中，点击binderA绑定→跳转BinderAcitivityB→binderB绑定→binderB解绑→BinderBfinish→BinderA解绑→BinderAfinish的日志
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
07-0913:16:10.0308593-8593/com.hh.servicedemoI/hjz:BindService->onCreate,Thread:main
07-0913:16:10.0308593-8593/com.hh.servicedemoI/hjz:BindService->onBind,Thread:main
07-0913:16:10.0508593-8593/com.hh.servicedemoV/hjz:numA=665064614
07-0913:16:13.6508593-8593/com.hh.servicedemoV/hjz:numB=1116469133
07-0913:16:16.5508593-8593/com.hh.servicedemoV/hjz:ActicityBisunbindService
07-0913:16:18.6808593-8593/com.hh.servicedemoI/hjz:ActivityB->onDestroy
07-0913:16:22.9208593-8593/com.hh.servicedemoV/hjz:ActicityAisunbindService
07-0913:16:22.9308593-8593/com.hh.servicedemoI/hjz:BindService->onUnbind,from:ActivityA
07-0913:16:22.9508593-8593/com.hh.servicedemoI/hjz:BindService->onDestroy,Thread:main
07-0913:16:25.6608593-8593/com.hh.servicedemoI/hjz:ActivityA->onDestroy
从打印日志中发现
在client（客户端）调用Service【同一个Service】情况下：
如果Service不存在，Service执行顺序是onCreate→onBind，接着client创建ServiceConnection实例并执行onServiceConnected这个方法。
如果Service已处于运行状态【说明在此之前已经在其他地方启动过该Service】，由于之前执行过的onBind回调获取IBinder实例，该IBinder实例在所有的client（客户端）之间是共享的，所以第二次执行onBind回调，直接使用上次已经获取的IBinder实例，并将其传入到与之对应的onServiceConnected方法中，标志着连接已经建立了起来，这时就有两个或者多个client（客户端）和Service绑定了。
client（客户端）执行unbindServie的流程：
client与Service解除绑定时，Service先检测是否还与其他client（客户端）与其连接→
如果没有，Service执行onUnbind方法，然后在执行onDestroy方法
如果有，Service不会执行onUnbind和onDestroy方法（从打印的日志中可以得出这样结论）
点击binderA绑定→跳转BinderAcitivityB→binderB绑定→binderB解绑→BinderBfinish→BinderAfinish的日志
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
07-0913:19:58.3408297-8297/com.hh.servicedemoI/hjz:BindService->onCreate,Thread:main
07-0913:19:58.3608297-8297/com.hh.servicedemoI/hjz:BindService->onBind,Thread:main
07-0913:19:58.3608297-8297/com.hh.servicedemoV/hjz:numA=2026321547
07-0913:20:02.1908297-8297/com.hh.servicedemoV/hjz:numB=-1586530569
07-0913:20:04.1408297-8297/com.hh.servicedemoV/hjz:ActicityBisunbindService
07-0913:20:05.8208297-8297/com.hh.servicedemoI/hjz:ActivityB->onDestroy
07-0913:20:07.0808297-8297/com.hh.servicedemoI/hjz:ActivityA->onDestroy
07-0913:20:07.1108297-8297/com.hh.servicedemoI/hjz:BindService->onUnbind,from:ActivityA
07-0913:20:07.1108297-8297/com.hh.servicedemoI/hjz:BindService->onDestroy,Thread:main
结论：当client与Service通过bindServer连接起来之后，如果client（客户端）执行（onDestroy）销毁，那么client会自动与Service解除绑定。
点击binderA绑定→跳转BinderAcitivityB→binderB绑定→BinderBfinish→BinderA解绑→BinderAfinish的日志
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
07-0913:17:40.3208297-8297/com.hh.servicedemoI/hjz:BindService->onCreate,Thread:main
07-0913:17:40.3208297-8297/com.hh.servicedemoI/hjz:BindService->onBind,Thread:main
07-0913:17:40.3408297-8297/com.hh.servicedemoV/hjz:numA=-1117645606
07-0913:17:43.4608297-8297/com.hh.servicedemoV/hjz:numB=1774346322
07-0913:17:44.7708297-8297/com.hh.servicedemoI/hjz:ActivityB->onDestroy
07-0913:17:56.7808297-8297/com.hh.servicedemoV/hjz:ActicityAisunbindService
07-0913:17:56.7808297-8297/com.hh.servicedemoI/hjz:BindService->onUnbind,from:ActivityA
07-0913:17:56.7808297-8297/com.hh.servicedemoI/hjz:BindService->onDestroy,Thread:main
07-0913:17:58.0608297-8297/com.hh.servicedemoI/hjz:ActivityA->onDestroy
点击binderA绑定→跳转BinderAcitivityB→binderB绑定→BinderBfinish→BinderAfinish的日志
[java]viewplaincopy在CODE上查看代码片派生到我的代码片
07-0913:21:22.8908297-8297/com.hh.servicedemoI/hjz:BindService->onCreate,Thread:main
07-0913:21:22.8908297-8297/com.hh.servicedemoI/hjz:BindService->onBind,Thread:main
07-0913:21:22.9008297-8297/com.hh.servicedemoV/hjz:numA=1947324308
07-0913:21:26.6308297-8297/com.hh.servicedemoV/hjz:numB=-1343649013
07-0913:21:27.7308297-8297/com.hh.servicedemoI/hjz:ActivityB->onDestroy
07-0913:21:29.0408297-8297/com.hh.servicedemoI/hjz:ActivityA->onDestroy
07-0913:21:29.0608297-8297/com.hh.servicedemoI/hjz:BindService->onUnbind,from:ActivityA
07-0913:21:29.0608297-8297/com.hh.servicedemoI/hjz:BindService->onDestroy,Thread:main
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