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：

public class servicea extends service {


  private static final string tag = servicea.class.getsimplename();
  mybinder mbinder;
  myserviceconnection mserviceconnection;
  pendingintent mpendingintent;

  @override
  public void oncreate() {
    super.oncreate();

    if(mbinder==null)
    {
      mbinder=new mybinder();
    }
    mserviceconnection=new myserviceconnection();
  }

  @override
  public int onstartcommand(intent intent, int flags, int startid) {
    servicea.this.bindservice(new intent(servicea.this,serviceb.class),mserviceconnection, context.bind_important);
    mpendingintent=pendingintent.getservice(this,0,intent,0);
    notification.builder builder=new notification.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());
    notification notification=builder.build();

    startforeground(startid,notification);


    return start_sticky;
  }

  @override
  public ibinder onbind(intent intent) {
    return mbinder;
  }

  public class mybinder extends ibridgeinterface.stub {

    @override
    public string getname() throws remoteexception {
      return "name:"+tag;
    }
  }

  class myserviceconnection implements serviceconnection {

    @override
    public void onserviceconnected(componentname componentname, ibinder ibinder) {
      string name=null;
      try {
        name= ibridgeinterface.stub.asinterface(ibinder).getname();
      } catch (remoteexception e) {
        e.printstacktrace();
      }


      toast.maketext(servicea.this,name+"连接成功",toast.length_short).show();
    }

    @override
    public void onservicedisconnected(componentname componentname) {
      toast.maketext(servicea.this,tag+"断开连接",toast.length_short).show();

      servicea.this.startservice(new intent(servicea.this,serviceb.class));

      servicea.this.bindservice(new intent(servicea.this,serviceb.class),mserviceconnection, context.bind_important);

    }
  }


}

服务b：

public class serviceb extends service {

  private static final string tag = serviceb.class.getsimplename();
  private pendingintent mpendingintent;
  private mybinder mbinder;
  private myserviceconnection mserviceconnection;

  @override
  public ibinder onbind(intent intent) {
    return mbinder;
  }

  @override
  public void oncreate() {
    super.oncreate();
    if (mbinder == null) {
      mbinder = new mybinder();
    }

    mserviceconnection = new myserviceconnection();
  }

  @override
  public int onstartcommand(intent intent, int flags, int startid) {
    this.bindservice(new intent(serviceb.this, servicea.class), mserviceconnection, context.bind_important);
    mpendingintent = pendingintent.getservice(this, 0, intent, 0);
    notification.builder builder = new notification.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());
    notification notification = builder.build();
    startforeground(startid, notification);

    return start_sticky;
  }

  public class mybinder extends ibridgeinterface.stub {

    @override
    public string getname() throws remoteexception {
      return "name:"+tag;
    }
  }

  class myserviceconnection implements serviceconnection {

    @override
    public void onserviceconnected(componentname componentname, ibinder ibinder) {
      string name=null;
      try {
        name=ibridgeinterface.stub.asinterface(ibinder).getname();
      } catch (remoteexception e) {
        e.printstacktrace();
      }
      toast.maketext(serviceb.this, name + "连接成功", toast.length_short).show();
    }

    @override
    public void onservicedisconnected(componentname componentname) {
      toast.maketext(serviceb.this, tag + "断开连接", toast.length_short).show();

      serviceb.this.startservice(new intent(serviceb.this, servicea.class));
      serviceb.this.bindservice(new intent(serviceb.this, servicea.class), mserviceconnection, context.bind_important);
    }
  }


}

ibridgeinterface.aidl

1 interface ibridgeinterface {
2   string getname();
3 }

界面：

public class mainactivity extends activity {


  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    startservice(new intent(this, servicea.class));
    startservice(new intent(this, serviceb.class));
  }

}

androidmanifest.xml

<service android: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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