Android 两个Service的相互监视实现代码
两个Service之间相互监视的实现
在实际开发中可能需要用到两个Service相互监视的情况，本示例就是实现此功能以作参考。
服务A：
publicclassServiceAextendsService{
privatestaticfinalStringTAG=ServiceA.class.getSimpleName();
MyBindermBinder;
MyServiceConnectionmServiceConnection;
PendingIntentmPendingIntent;
@Override
publicvoidonCreate(){
super.onCreate();
if(mBinder==null)
{
mBinder=newMyBinder();
}
mServiceConnection=newMyServiceConnection();
}
@Override
publicintonStartCommand(Intentintent,intflags,intstartId){
ServiceA.this.bindService(newIntent(ServiceA.this,ServiceB.class),mServiceConnection,Context.BIND_IMPORTANT);
mPendingIntent=PendingIntent.getService(this,0,intent,0);
Notification.Builderbuilder=newNotification.Builder(this);
builder.setTicker("守护服务A启动中")
.setContentText("我是来守护服务B的")
.setContentTitle("守护服务A")
.setSmallIcon(R.mipmap.ic_launcher)
.setContentIntent(mPendingIntent)
.setWhen(System.currentTimeMillis());
Notificationnotification=builder.build();
startForeground(startId,notification);
returnSTART_STICKY;
}
@Override
publicIBinderonBind(Intentintent){
returnmBinder;
}
publicclassMyBinderextendsIBridgeInterface.Stub{
@Override
publicStringgetName()throwsRemoteException{
return"name:"+TAG;
}
}
classMyServiceConnectionimplementsServiceConnection{
@Override
publicvoidonServiceConnected(ComponentNamecomponentName,IBinderiBinder){
Stringname=null;
try{
name=IBridgeInterface.Stub.asInterface(iBinder).getName();
}catch(RemoteExceptione){
e.printStackTrace();
}
Toast.makeText(ServiceA.this,name+"连接成功",Toast.LENGTH_SHORT).show();
}
@Override
publicvoidonServiceDisconnected(ComponentNamecomponentName){
Toast.makeText(ServiceA.this,TAG+"断开连接",Toast.LENGTH_SHORT).show();
ServiceA.this.startService(newIntent(ServiceA.this,ServiceB.class));
ServiceA.this.bindService(newIntent(ServiceA.this,ServiceB.class),mServiceConnection,Context.BIND_IMPORTANT);
}
}
}
服务B：
publicclassServiceBextendsService{
privatestaticfinalStringTAG=ServiceB.class.getSimpleName();
privatePendingIntentmPendingIntent;
privateMyBindermBinder;
privateMyServiceConnectionmServiceConnection;
@Override
publicIBinderonBind(Intentintent){
returnmBinder;
}
@Override
publicvoidonCreate(){
super.onCreate();
if(mBinder==null){
mBinder=newMyBinder();
}
mServiceConnection=newMyServiceConnection();
}
@Override
publicintonStartCommand(Intentintent,intflags,intstartId){
this.bindService(newIntent(ServiceB.this,ServiceA.class),mServiceConnection,Context.BIND_IMPORTANT);
mPendingIntent=PendingIntent.getService(this,0,intent,0);
Notification.Builderbuilder=newNotification.Builder(this);
builder.setTicker("守护服务B启动中")
.setContentText("我是来守护服务A的")
.setContentTitle("守护服务B")
.setSmallIcon(R.mipmap.ic_launcher)
.setContentIntent(mPendingIntent)
.setWhen(System.currentTimeMillis());
Notificationnotification=builder.build();
startForeground(startId,notification);
returnSTART_STICKY;
}
publicclassMyBinderextendsIBridgeInterface.Stub{
@Override
publicStringgetName()throwsRemoteException{
return"name:"+TAG;
}
}
classMyServiceConnectionimplementsServiceConnection{
@Override
publicvoidonServiceConnected(ComponentNamecomponentName,IBinderiBinder){
Stringname=null;
try{
name=IBridgeInterface.Stub.asInterface(iBinder).getName();
}catch(RemoteExceptione){
e.printStackTrace();
}
Toast.makeText(ServiceB.this,name+"连接成功",Toast.LENGTH_SHORT).show();
}
@Override
publicvoidonServiceDisconnected(ComponentNamecomponentName){
Toast.makeText(ServiceB.this,TAG+"断开连接",Toast.LENGTH_SHORT).show();
ServiceB.this.startService(newIntent(ServiceB.this,ServiceA.class));
ServiceB.this.bindService(newIntent(ServiceB.this,ServiceA.class),mServiceConnection,Context.BIND_IMPORTANT);
}
}
}
IBridgeInterface.aidl
1interfaceIBridgeInterface{
2StringgetName();
3}
界面：
publicclassMainActivityextendsActivity{
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startService(newIntent(this,ServiceA.class));
startService(newIntent(this,ServiceB.class));
}
}
AndroidManifest.xml
<serviceandroid:name=".services.ServiceA"/> <service android:name=".services.ServiceB" android:process=":remote"/>
由于涉及到跨进程，onServiceConnected()方法中使用
IBridgeInterface.Stub.asInterface(iBinder).getName();
而不能直接类型转换
((ServiceA.MyBinder)iBinder).getName();
onStartCommand
onStartCommand()方法必须返回整型数。整型数是一个值，用于描述系统应该如何在服务终止的情况下继续运行服务。
返回的值必须是以下常量之一：
START_NOT_STICKY
如果系统在onStartCommand()返回后终止服务，则除非有挂起Intent要传递，否则系统不会重建服务。
START_STICKY
如果系统在onStartCommand()返回后终止服务，则会重建服务并调用onStartCommand()，但绝对不会重新传递最后一个Intent。相反，除非有挂起Intent要启动服务（在这种情况下，将传递这些Intent），否则系统会通过空Intent调用onStartCommand()。这适用于不执行命令、但无限期运行并等待作业的媒体播放器（或类似服务）。
START_REDELIVER_INTENT
如果系统在onStartCommand()返回后终止服务，则会重建服务，并通过传递给服务的最后一个Intent调用onStartCommand()。任何挂起Intent均依次传递。这适用于主动执行应该立即恢复的作业（例如下载文件）的服务。
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