Android网络性能监控方案 android线上性能监测

1 Handler消息机制
这里我不会完整的从Handler源码来分析Android的消息体系，而是从Handler自身的特性引申出线上卡顿监控的策略方案。

1.1 方案确认
首先当我们启动一个App的时候，是由AMS通知zygote进程fork出主进程，其中主进程的入口就是ActivityThread的main方法，在这个方法中开启Loop死循环来处理系统消息。

Looper.loop();
1.
在ActivityThread中，有一个内部类ApplicationThread，这个类是system_server的一个代理对象，负责App主进程与system_server进程的通信（如果对这块有疑问的，可以看之前的文章都有详细的介绍）。

private class ApplicationThread extends IApplicationThread.Stub {
    private static final String DB_INFO_FORMAT = "  %8s %8s %14s %14s  %s";

    @Override
    public final void bindApplication(String processName, ApplicationInfo appInfo,
            ProviderInfoList providerList, ComponentName instrumentationName,
            ProfilerInfo profilerInfo, Bundle instrumentationArgs,
            IInstrumentationWatcher instrumentationWatcher,
            IUiAutomationConnection instrumentationUiConnection, int debugMode,
            boolean enableBinderTracking, boolean trackAllocation,
            boolean isRestrictedBackupMode, boolean persistent, Configuration config,
            CompatibilityInfo compatInfo, Map services, Bundle coreSettings,
            String buildSerial, AutofillOptions autofillOptions,
            ContentCaptureOptions contentCaptureOptions, long[] disabledCompatChanges,
            SharedMemory serializedSystemFontMap) {
        if (services != null) {
            if (false) {
                // Test code to make sure the app could see the passed-in services.
                for (Object oname : services.keySet()) {
                    if (services.get(oname) == null) {
                        continue; // AM just passed in a null service.
                    }
                    String name = (String) oname;

                    // See b/79378449 about the following exemption.
                    switch (name) {
                        case "package":
                        case Context.WINDOW_SERVICE:
                            continue;
                    }

                    if (ServiceManager.getService(name) == null) {
                        Log.wtf(TAG, "Service " + name + " should be accessible by this app");
                    }
                }
            }

            // Setup the service cache in the ServiceManager
            ServiceManager.initServiceCache(services);
        }

        setCoreSettings(coreSettings);

        AppBindData data = new AppBindData();
        data.processName = processName;
        data.appInfo = appInfo;
        data.providers = providerList.getList();
        data.instrumentationName = instrumentationName;
        data.instrumentationArgs = instrumentationArgs;
        data.instrumentationWatcher = instrumentationWatcher;
        data.instrumentationUiAutomationConnection = instrumentationUiConnection;
        data.debugMode = debugMode;
        data.enableBinderTracking = enableBinderTracking;
        data.trackAllocation = trackAllocation;
        data.restrictedBackupMode = isRestrictedBackupMode;
        data.persistent = persistent;
        data.config = config;
        data.compatInfo = compatInfo;
        data.initProfilerInfo = profilerInfo;
        data.buildSerial = buildSerial;
        data.autofillOptions = autofillOptions;
        data.contentCaptureOptions = contentCaptureOptions;
        data.disabledCompatChanges = disabledCompatChanges;
        data.mSerializedSystemFontMap = seri