AMS-ApplicationThread

ApplicationThread的作用

ApplicationThread是ActivityThead的一个内部类，是一个Binder服务类，
ActivityManagerService操作应用就是通过ApplicationThread提供的接口完成的。

   private class ApplicationThread extends IApplicationThread.Stub {
        private static final String DB_INFO_FORMAT = "  %8s %8s %14s %14s  %s";
············
        public final void scheduleReceiver(Intent intent, ActivityInfo info,
                CompatibilityInfo compatInfo, int resultCode, String data, Bundle extras,
                boolean sync, int sendingUser, int processState) {
            updateProcessState(processState, false);
            ReceiverData r = new ReceiverData(intent, resultCode, data, extras,
                    sync, false, mAppThread.asBinder(), sendingUser);
            r.info = info;
            r.compatInfo = compatInfo;
            sendMessage(H.RECEIVER, r);
        }

        public final void scheduleCreateBackupAgent(ApplicationInfo app,
                CompatibilityInfo compatInfo, int backupMode, int userId) {
            CreateBackupAgentData d = new CreateBackupAgentData();
            d.appInfo = app;
            d.compatInfo = compatInfo;
            d.backupMode = backupMode;
            d.userId = userId;

            sendMessage(H.CREATE_BACKUP_AGENT, d);
        }

        public final void scheduleDestroyBackupAgent(ApplicationInfo app,
                CompatibilityInfo compatInfo, int userId) {
            CreateBackupAgentData d = new CreateBackupAgentData();
            d.appInfo = app;
            d.compatInfo = compatInfo;
            d.userId = userId;

            sendMessage(H.DESTROY_BACKUP_AGENT, d);
        }

        public final void scheduleCreateService(IBinder token,
                ServiceInfo info, CompatibilityInfo compatInfo, int processState) {
            updateProcessState(processState, false);
            CreateServiceData s = new CreateServiceData();
            s.token = token;
            s.info = info;
            s.compatInfo = compatInfo;

            sendMessage(H.CREATE_SERVICE, s);
        }

        public final void scheduleBindService(IBinder token, Intent intent,
                boolean rebind, int processState) {
            updateProcessState(processState, false);
            BindServiceData s = new BindServiceData();
            s.token = token;
            s.intent = intent;
            s.rebind = rebind;

            if (DEBUG_SERVICE)
                Slog.v(TAG, "scheduleBindService token=" + token + " intent=" + intent + " uid="
                        + Binder.getCallingUid() + " pid=" + Binder.getCallingPid());
            sendMessage(H.BIND_SERVICE, s);
        }

        public final void scheduleUnbindService(IBinder token, Intent intent) {
            BindServiceData s = new BindServiceData();
            s.token = token;
            s.intent = intent;

            sendMessage(H.UNBIND_SERVICE, s);
        }

        public final void scheduleServiceArgs(IBinder token, ParceledListSlice args) {
            List<ServiceStartArgs> list = args.getList();

            for (int i = 0; i < list.size(); i++) {
                ServiceStartArgs ssa = list.get(i);
                ServiceArgsData s = new ServiceArgsData();
                s.token = token;
                s.taskRemoved = ssa.taskRemoved;
                s.startId = ssa.startId;
                s.flags = ssa.flags;
                s.args = ssa.args;

                sendMessage(H.SERVICE_ARGS, s);
            }
        }

        public final void scheduleStopService(IBinder token) {
            sendMessage(H.STOP_SERVICE, token);
        }
        ·····················

}

ApplicationThread类从ApplicationThreadNative类派生，ApplicationThreadNative类中封装了Binder的实现。ApplicationThread虽然定义了大量的接口，但是接口的实现模式都是把Binder调用转换成mH 的消息来排队处理 。