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public static Runnable zygoteInit(int targetSdkVersion, long[] disabledCompatChanges,
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            String[] argv, ClassLoader classLoader) {
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        ...
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        // 原生添加名为“ZygoteInit ”的systrace tag以标识进程初始化流程
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        Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "ZygoteInit");
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        RuntimeInit.redirectLogStreams();
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        // 1.RuntimeInit#commonInit中设置应用进程默认的java异常处理机制
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        RuntimeInit.commonInit();
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        // 2.ZygoteInit#nativeZygoteInit函数中JNI调用启动进程的binder线程池
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        ZygoteInit.nativeZygoteInit();
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        // 3.RuntimeInit#applicationInit中反射创建ActivityThread对象并调用其“main”入口方法
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        return RuntimeInit.applicationInit(targetSdkVersion, disabledCompatChanges, argv,
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                classLoader);
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 }