Android(安卓)SystemServer学习之二

在Sytem Server运行时，会启动多个Java线程。第一个线程用于其它Service的消息处理，第二个线程用于ActivityManagerService和ActivityThread的消息处理，第三个用于WindowManagerService及KeyGuard TokenWatcher的消息处理。

ActivityManagerService.java

public final class ActivityManagerService extends ActivityManagerNative        implements Watchdog.Monitor, BatteryStatsImpl.BatteryCallback { final Handler mHandler = new Handler() {

WindowManagerService.java

public class WindowManagerService extends IWindowManager.Stub implements Watchdog.Monitor { H mH = new H(); final TokenWatcher mKeyguardTokenWatcher = new TokenWatcher( new Handler(), "WindowManagerService.mKeyguardTokenWatcher") { ...    } private final class H extends Handler {

ActivityThread.java

public final class ActivityThread { ... final H mH = new H(); public static final void main(String[] args) { SamplingProfilerIntegration.start(); Process.setArgV0("<pre-initialized>"); Looper.prepareMainLooper(); if (sMainThreadHandler == null) { sMainThreadHandler = new Handler(); }...    }    private final class H extends Handler {

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