欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

Handler消息机制源码分析

程序员文章站 2022-07-14 19:40:51
...

Hander消息机制源码分析

一、Hander消息简单使用

       findViewById(R.id.threadlocal_btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Thread thread = new Thread("thread#2") {
                    @Override
                    public void run() {
                        Looper.prepare();
                        handler = new Handler(Looper.myLooper(), new Handler.Callback() {
                            @Override
                            public boolean handleMessage(Message msg) {
                                Log.i(TAG, "handleMessage: currentThreadName=" + Thread.currentThread().getName()) + " msg =" + msg.arg1)
                                return false;
                            }
                        });
                        Log.i(TAG, "run: 1111");
                        Looper.loop();
                        Log.i(TAG, "run: 2222 这个是不会执行的");
                    }
                };
                thread.start();
            }
        });
        findViewById(R.id.hander_btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (handler != null) {
                    Message message = Message.obtain(handler, -1, 2222, -1);
                    handler.sendMessageAtTime(message, 2000);
                    Log.i(TAG, "onClick: 222");
                }
            }
        });

二、Handler原理

Handler主要是消息的发送和消息的接受

常用发送消息方法:

                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {

                    }
                },300);
    public final boolean postDelayed(Runnable r, long delayMillis)   
 
    public final boolean sendMessageDelayed(Message msg, long delayMillis)
    
    public boolean sendMessageAtTime(Message msg, long uptimeMillis) 

 

   Hander消息处理

    msg.target.dispatchMessage(msg);/***这里直接将消息发送到handler中处理**/    
    
    /** 消息的处理
     * Handle system messages here.
     */
    public void dispatchMessage(Message msg) {
        if (msg.callback != null) {/**消息有回调情况则直接回调**/
            handleCallback(msg);
        } else {
            if (mCallback != null) {/**handler有回调情况则直接回调**/
                if (mCallback.handleMessage(msg)) {
                    return;
                }
            }
            handleMessage(msg);/**没有回调情况直接调用Handler子类中复写了handleMessage**/
        }
    }

三、消息进入队列

    private boolean enqueueMessage(MessageQueue queue, Message msg, long uptimeMillis) {
        msg.target = this;
        if (mAsynchronous) {
            msg.setAsynchronous(true);
        }
        return queue.enqueueMessage(msg, uptimeMillis);
    }

 消息队列MessageQueue是链表式的队列。

进入队列的方法

  /****
     * 消息进入队列 MessageQueue
     * @param msg  消息
     * @param when 执行时间  when= SystemClock.uptimeMillis() + delayMillis
     * @return
     */
    boolean enqueueMessage(Message msg, long when) {
        if (msg.target == null) { /***mmessage最终是要在Handler执行的,**/
            throw new IllegalArgumentException("Message must have a target.");
        }
        if (msg.isInUse()) {/**消息已被使用了**/
            throw new IllegalStateException(msg + " This message is already in use.");
        }

        synchronized (this) {
            if (mQuitting) { /***队列已经停止工作**/
                IllegalStateException e = new IllegalStateException(
                        msg.target + " sending message to a Handler on a dead thread");
                Log.w(TAG, e.getMessage(), e);
                msg.recycle();/***回收消息,进入队列失败**/
                return false;
            }

            msg.markInUse();/**消息标记为已被使用了**/
            msg.when = when;/**消息记录要在什么时候执行**/
            Message p = mMessages;/***当前Messages队列,队列首元素指针**/
            boolean needWake;  /**当前队列首元素为空  或者 该消息是要立即执行 或者 改消息的执行时间比队列首元素要早 **/
            if (p == null || when == 0 || when < p.when) {
                // New head, wake up the event queue if blocked.
                msg.next = p;   /**要插入的消息作为队列首元素**/
                mMessages = msg;
                needWake = mBlocked;
            } else {
                // Inserted within the middle of the queue.  Usually we don't have to wake
                // up the event queue unless there is a barrier at the head of the queue
                // and the message is the earliest asynchronous message in the queue.
                needWake = mBlocked && p.target == null && msg.isAsynchronous();/**一般是不需要唤醒**/
                Message prev; /***前一个消息**/
                for (;;) {
                    prev = p;
                    p = p.next; /**下一个消息**/
                    if (p == null || when < p.when) {/***下一个消息为空 或者 插入的消息执行时间要比下一个消息要早,插入的消息要在p的前面**/
                        break;
                    }
                    if (needWake && p.isAsynchronous()) {/**异步则改成不需要唤醒**/
                        needWake = false;
                    }
                }
                msg.next = p; // invariant: p == prev.next
                prev.next = msg;/**在prew和msg间插入新消息**/
            }

            // We can assume mPtr != 0 because mQuitting is false.
            if (needWake) {/**需要唤醒的情况***/
                nativeWake(mPtr);
            }
        }
        return true;
    }

从队列出的方法。当然是根据消息具体的处理时刻来出队列的

 /**从队列中取出一个要执行的消息**/
    Message next() {
        // Return here if the message loop has already quit and been disposed.
        // This can happen if the application tries to restart a looper after quit
        // which is not supported.
        final long ptr = mPtr;
        if (ptr == 0) {/**loop循环已经终止,直接返回**/
            return null;
        }
        /***挂起空闲要处理的消息的数量**/
        int pendingIdleHandlerCount = -1; // -1 only during first iteration
        int nextPollTimeoutMillis = 0;/**下一个执行消息的超时时间,单位毫秒ms**/
        for (;;) {/**死循环**/
            if (nextPollTimeoutMillis != 0) {/**下次要执行超时时间不为0,则调用Binder的flushPendingCommands对当前任务挂起**/
                Binder.flushPendingCommands();
            }

            nativePollOnce(ptr, nextPollTimeoutMillis);/***线程挂起的时间为nextPollTimeoutMillis 毫秒**/

            synchronized (this) {
                // Try to retrieve the next message.  Return if found.
                final long now = SystemClock.uptimeMillis();/***当前手机系统时间(指定是手机系统启动时算起)**/
                Message prevMsg = null;/**前一个消息***/
                Message msg = mMessages;/**队列首个元素**/
                if (msg != null && msg.target == null) {/**这个msg没有要处理被处理的场所,则取下一个**/
                    // Stalled by a barrier.  Find the next asynchronous message in the queue.
                    do {
                        prevMsg = msg;
                        msg = msg.next;
                    } while (msg != null && !msg.isAsynchronous());/**msg是要同步的则继续取下一个**/
                }
                if (msg != null) {
                    if (now < msg.when) {/**当前系统时间比消息要执行的时间要早***/
                        // Next message is not ready.  Set a timeout to wake up when it is ready.
                        nextPollTimeoutMillis = (int) Math.min(msg.when - now, Integer.MAX_VALUE);/**计算出msg下次要执行的时间**/
                    } else {
                        // Got a message.
                        mBlocked = false;/**标记为不需要阻塞**/
                        if (prevMsg != null) {
                            prevMsg.next = msg.next;/**前一个元素直接指向下一个元素的next**/
                        } else {
                            mMessages = msg.next;/**前一个元素直接指向下一个元素的next**/
                        }
                        msg.next = null; /**取出msg元素***/
                        if (DEBUG) Log.v(TAG, "Returning message: " + msg);
                        msg.markInUse();
                        return msg;/**返回这个元素就完事了**/
                    }
                } else {
                    // No more messages.
                    nextPollTimeoutMillis = -1;/**没有消息的情况***/
                }

                // Process the quit message now that all pending messages have been handled.
                if (mQuitting) {/**处理停止的消息 所有消息被处理掉了**/
                    dispose();
                    return null;
                }

                // If first time idle, then get the number of idlers to run.
                // Idle handles only run if the queue is empty or if the first message
                // in the queue (possibly a barrier) is due to be handled in the future.
                if (pendingIdleHandlerCount < 0 /**被挂起的消息个数小于0,消息队列为空,系统时间早于队列首个元素的执行时间***/
                        && (mMessages == null || now < mMessages.when)) {
                    pendingIdleHandlerCount = mIdleHandlers.size();/**记录当前被空闲的回调**/
                }
                if (pendingIdleHandlerCount <= 0) {/**回调为<=0**/
                    // No idle handlers to run.  Loop and wait some more.
                    mBlocked = true;/***进行阻塞**/
                    continue;
                }

                if (mPendingIdleHandlers == null) { /**创建最少四个挂起回调数组***/
                    mPendingIdleHandlers = new IdleHandler[Math.max(pendingIdleHandlerCount, 4)];
                }
                mPendingIdleHandlers = mIdleHandlers.toArray(mPendingIdleHandlers);
            }

            // Run the idle handlers.
            // We only ever reach this code block during the first iteration.
            for (int i = 0; i < pendingIdleHandlerCount; i++) {
                final IdleHandler idler = mPendingIdleHandlers[i];/**挂起回调**/
                mPendingIdleHandlers[i] = null; // release the reference to the handler

                boolean keep = false;
                try {
                    keep = idler.queueIdle();/**队列空闲???**/
                } catch (Throwable t) {
                    Log.wtf(TAG, "IdleHandler threw exception", t);
                }

                if (!keep) {/**不保留则直接移除**/
                    synchronized (this) {
                        mIdleHandlers.remove(idler);
                    }
                }
            }

            // Reset the idle handler count to 0 so we do not run them again.
            pendingIdleHandlerCount = 0;/****/

            // While calling an idle handler, a new message could have been delivered
            // so go back and look again for a pending message without waiting.
            nextPollTimeoutMillis = 0;
        }
    }

四、Looper的工作原理

Looper在消息机制中作用是:消息循环,会不停对从MessageQueue中查看是否有新的消息。如果有新消息则会立即处理。否则一直阻塞在那里。

    /**
     * Run the message queue in this thread. Be sure to call
     * {@link #quit()} to end the loop.
     */
    public static void loop() {
        final Looper me = myLooper();/**拿到当前线程的中的Looper**/
        if (me == null) {/**当前looper为空的情况抛出异常**/
            throw new RuntimeException("No Looper; Looper.prepare() wasn't called on this thread.");
        }
        final MessageQueue queue = me.mQueue;/**拿到Looper中的消息队列**/

        // Make sure the identity of this thread is that of the local process,
        // and keep track of what that identity token actually is.
        Binder.clearCallingIdentity();/**清空远程调用端的uid和pid,用当前本地进程的uid和pid替换**/
        final long ident = Binder.clearCallingIdentity();

        // Allow overriding a threshold with a system prop. e.g.
        // adb shell 'setprop log.looper.1000.main.slow 1 && stop && start'
        final int thresholdOverride =
                SystemProperties.getInt("log.looper."
                        + Process.myUid() + "."
                        + Thread.currentThread().getName()
                        + ".slow", 0);

        boolean slowDeliveryDetected = false;/**减慢传输探测**/

        for (;;) {/**死循环**/
            Message msg = queue.next(); // might block  从队列中去一个消息处理 可能被阻塞哦
            if (msg == null) {/**消息为空直接返回**/
                // No message indicates that the message queue is quitting.
                return;
            }

            // This must be in a local variable, in case a UI event sets the logger
            final Printer logging = me.mLogging;
            if (logging != null) {
                logging.println(">>>>> Dispatching to " + msg.target + " " +
                        msg.callback + ": " + msg.what);
            }

            final long traceTag = me.mTraceTag;
            long slowDispatchThresholdMs = me.mSlowDispatchThresholdMs;/**减慢时间分发**/
            long slowDeliveryThresholdMs = me.mSlowDeliveryThresholdMs;/**减慢传送**/
            if (thresholdOverride > 0) {
                slowDispatchThresholdMs = thresholdOverride;
                slowDeliveryThresholdMs = thresholdOverride;
            }
            final boolean logSlowDelivery = (slowDeliveryThresholdMs > 0) && (msg.when > 0);
            final boolean logSlowDispatch = (slowDispatchThresholdMs > 0);

            final boolean needStartTime = logSlowDelivery || logSlowDispatch;
            final boolean needEndTime = logSlowDispatch;

            if (traceTag != 0 && Trace.isTagEnabled(traceTag)) {
                Trace.traceBegin(traceTag, msg.target.getTraceName(msg));
            }

            final long dispatchStart = needStartTime ? SystemClock.uptimeMillis() : 0;
            final long dispatchEnd;
            try {
                msg.target.dispatchMessage(msg);/***这里直接将消息发送到handler中处理**/
                dispatchEnd = needEndTime ? SystemClock.uptimeMillis() : 0;
            } finally {
                if (traceTag != 0) {
                    Trace.traceEnd(traceTag);
                }
            }
            if (logSlowDelivery) {
                if (slowDeliveryDetected) {
                    if ((dispatchStart - msg.when) <= 10) {
                        Slog.w(TAG, "Drained");
                        slowDeliveryDetected = false;
                    }
                } else {
                    if (showSlowLog(slowDeliveryThresholdMs, msg.when, dispatchStart, "delivery",
                            msg)) {
                        // Once we write a slow delivery log, suppress until the queue drains.
                        slowDeliveryDetected = true;
                    }
                }
            }
            if (logSlowDispatch) {
                showSlowLog(slowDispatchThresholdMs, dispatchStart, dispatchEnd, "dispatch", msg);
            }

            if (logging != null) {
                logging.println("<<<<< Finished to " + msg.target + " " + msg.callback);
            }

            // Make sure that during the course of dispatching the
            // identity of the thread wasn't corrupted.
            final long newIdent = Binder.clearCallingIdentity();
            if (ident != newIdent) {
                Log.wtf(TAG, "Thread identity changed from 0x"
                        + Long.toHexString(ident) + " to 0x"
                        + Long.toHexString(newIdent) + " while dispatching to "
                        + msg.target.getClass().getName() + " "
                        + msg.callback + " what=" + msg.what);
            }

            msg.recycleUnchecked();/**回收**/
        }
    }
     /**UI主线程**/
    public static void main(String[] args) {
      
        CloseGuard.setEnabled(false);

        Environment.initForCurrentUser();

        EventLogger.setReporter(new EventLoggingReporter());

        final File configDir = Environment.getUserConfigDirectory(UserHandle.myUserId());
        TrustedCertificateStore.setDefaultUserDirectory(configDir);

 
        /**创建主线程Looper**/
        Looper.prepareMainLooper();


        ActivityThread thread = new ActivityThread();
        thread.attach(false, startSeq);

        /**获取主线的Handler**/
        if (sMainThreadHandler == null) {
            sMainThreadHandler = thread.getHandler();
        }

        Looper.loop();/**启动loop循环**/
    }

主线程的Handler

    /**主线程的Handler**/
    class H extends Handler {
        public static final int BIND_APPLICATION        = 110;
        public static final int EXIT_APPLICATION        = 111;
        public static final int RECEIVER                = 113;
        public static final int CREATE_SERVICE          = 114;
        public static final int SERVICE_ARGS            = 115;
        public static final int STOP_SERVICE            = 116;

        public static final int CONFIGURATION_CHANGED   = 118;
        public static final int CLEAN_UP_CONTEXT        = 119;
        public static final int GC_WHEN_IDLE            = 120;
        public static final int BIND_SERVICE            = 121;
        public static final int UNBIND_SERVICE          = 122;
        public static final int DUMP_SERVICE            = 123;
        public static final int LOW_MEMORY              = 124;
        public static final int PROFILER_CONTROL        = 127;
        public static final int CREATE_BACKUP_AGENT     = 128;
        public static final int DESTROY_BACKUP_AGENT    = 129;
        public static final int SUICIDE                 = 130;
        public static final int REMOVE_PROVIDER         = 131;
        public static final int ENABLE_JIT              = 132;
        public static final int DISPATCH_PACKAGE_BROADCAST = 133;
        public static final int SCHEDULE_CRASH          = 134;
        public static final int DUMP_HEAP               = 135;
        public static final int DUMP_ACTIVITY           = 136;
        public static final int SLEEPING                = 137;
        public static final int SET_CORE_SETTINGS       = 138;
        public static final int UPDATE_PACKAGE_COMPATIBILITY_INFO = 139;
        public static final int DUMP_PROVIDER           = 141;
        public static final int UNSTABLE_PROVIDER_DIED  = 142;
        public static final int REQUEST_ASSIST_CONTEXT_EXTRAS = 143;
        public static final int TRANSLUCENT_CONVERSION_COMPLETE = 144;
        public static final int INSTALL_PROVIDER        = 145;
        public static final int ON_NEW_ACTIVITY_OPTIONS = 146;
        public static final int ENTER_ANIMATION_COMPLETE = 149;
        public static final int START_BINDER_TRACKING = 150;
        public static final int STOP_BINDER_TRACKING_AND_DUMP = 151;
        public static final int LOCAL_VOICE_INTERACTION_STARTED = 154;
        public static final int ATTACH_AGENT = 155;
        public static final int APPLICATION_INFO_CHANGED = 156;
        public static final int RUN_ISOLATED_ENTRY_POINT = 158;
        public static final int EXECUTE_TRANSACTION = 159;
        public static final int RELAUNCH_ACTIVITY = 160;

   
        public void handleMessage(Message msg) {/**处理消息**/
            if (DEBUG_MESSAGES) Slog.v(TAG, ">>> handling: " + codeToString(msg.what));
            switch (msg.what) {
                case BIND_APPLICATION:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "bindApplication");
                    AppBindData data = (AppBindData)msg.obj;
                    handleBindApplication(data);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case EXIT_APPLICATION:
                    if (mInitialApplication != null) {
                        mInitialApplication.onTerminate();
                    }
                    Looper.myLooper().quit();
                    break;
                case RECEIVER:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "broadcastReceiveComp");
                    handleReceiver((ReceiverData)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case CREATE_SERVICE:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, ("serviceCreate: " + String.valueOf(msg.obj)));
                    handleCreateService((CreateServiceData)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case BIND_SERVICE:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceBind");
                    handleBindService((BindServiceData)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case UNBIND_SERVICE:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceUnbind");
                    handleUnbindService((BindServiceData)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case SERVICE_ARGS:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, ("serviceStart: " + String.valueOf(msg.obj)));
                    handleServiceArgs((ServiceArgsData)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case STOP_SERVICE:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceStop");
                    handleStopService((IBinder)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case CONFIGURATION_CHANGED:
                    handleConfigurationChanged((Configuration) msg.obj);
                    break;
                case CLEAN_UP_CONTEXT:
                    ContextCleanupInfo cci = (ContextCleanupInfo)msg.obj;
                    cci.context.performFinalCleanup(cci.who, cci.what);
                    break;
                case GC_WHEN_IDLE:
                    scheduleGcIdler();
                    break;
                case DUMP_SERVICE:
                    handleDumpService((DumpComponentInfo)msg.obj);
                    break;
                case LOW_MEMORY:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "lowMemory");
                    handleLowMemory();
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case PROFILER_CONTROL:
                    handleProfilerControl(msg.arg1 != 0, (ProfilerInfo)msg.obj, msg.arg2);
                    break;
                case CREATE_BACKUP_AGENT:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "backupCreateAgent");
                    handleCreateBackupAgent((CreateBackupAgentData)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case DESTROY_BACKUP_AGENT:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "backupDestroyAgent");
                    handleDestroyBackupAgent((CreateBackupAgentData)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case SUICIDE:
                    Process.killProcess(Process.myPid());
                    break;
                case REMOVE_PROVIDER:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "providerRemove");
                    completeRemoveProvider((ProviderRefCount)msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case ENABLE_JIT:
                    ensureJitEnabled();
                    break;
                case DISPATCH_PACKAGE_BROADCAST:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "broadcastPackage");
                    handleDispatchPackageBroadcast(msg.arg1, (String[])msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case SCHEDULE_CRASH:
                    throw new RemoteServiceException((String)msg.obj);
                case DUMP_HEAP:
                    handleDumpHeap((DumpHeapData) msg.obj);
                    break;
                case DUMP_ACTIVITY:
                    handleDumpActivity((DumpComponentInfo)msg.obj);
                    break;
                case DUMP_PROVIDER:
                    handleDumpProvider((DumpComponentInfo)msg.obj);
                    break;
                case SLEEPING:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "sleeping");
                    handleSleeping((IBinder)msg.obj, msg.arg1 != 0);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case SET_CORE_SETTINGS:
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "setCoreSettings");
                    handleSetCoreSettings((Bundle) msg.obj);
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                    break;
                case UPDATE_PACKAGE_COMPATIBILITY_INFO:
                    handleUpdatePackageCompatibilityInfo((UpdateCompatibilityData)msg.obj);
                    break;
                case UNSTABLE_PROVIDER_DIED:
                    handleUnstableProviderDied((IBinder)msg.obj, false);
                    break;
                case REQUEST_ASSIST_CONTEXT_EXTRAS:
                    handleRequestAssistContextExtras((RequestAssistContextExtras)msg.obj);
                    break;
                case TRANSLUCENT_CONVERSION_COMPLETE:
                    handleTranslucentConversionComplete((IBinder)msg.obj, msg.arg1 == 1);
                    break;
                case INSTALL_PROVIDER:
                    handleInstallProvider((ProviderInfo) msg.obj);
                    break;
                case ON_NEW_ACTIVITY_OPTIONS:
                    Pair<IBinder, ActivityOptions> pair = (Pair<IBinder, ActivityOptions>) msg.obj;
                    onNewActivityOptions(pair.first, pair.second);
                    break;
                case ENTER_ANIMATION_COMPLETE:
                    handleEnterAnimationComplete((IBinder) msg.obj);
                    break;
                case START_BINDER_TRACKING:
                    handleStartBinderTracking();
                    break;
                case STOP_BINDER_TRACKING_AND_DUMP:
                    handleStopBinderTrackingAndDump((ParcelFileDescriptor) msg.obj);
                    break;
                case LOCAL_VOICE_INTERACTION_STARTED:
                    handleLocalVoiceInteractionStarted((IBinder) ((SomeArgs) msg.obj).arg1,
                            (IVoiceInteractor) ((SomeArgs) msg.obj).arg2);
                    break;
                case ATTACH_AGENT: {
                    Application app = getApplication();
                    handleAttachAgent((String) msg.obj, app != null ? app.mLoadedApk : null);
                    break;
                }
                case APPLICATION_INFO_CHANGED:
                    mUpdatingSystemConfig = true;
                    try {
                        handleApplicationInfoChanged((ApplicationInfo) msg.obj);
                    } finally {
                        mUpdatingSystemConfig = false;
                    }
                    break;
                case RUN_ISOLATED_ENTRY_POINT:
                    handleRunIsolatedEntryPoint((String) ((SomeArgs) msg.obj).arg1,
                            (String[]) ((SomeArgs) msg.obj).arg2);
                    break;
                case EXECUTE_TRANSACTION:
                    final ClientTransaction transaction = (ClientTransaction) msg.obj;
                    mTransactionExecutor.execute(transaction);
     
                    break;
                case RELAUNCH_ACTIVITY:
                    handleRelaunchActivityLocally((IBinder) msg.obj);
                    break;
            }
            Object obj = msg.obj;
            if (obj instanceof SomeArgs) {
                ((SomeArgs) obj).recycle();
            }
        }
    }