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public static final class Lifecycle extends SystemService{
private final ActivityManagerService mService;
// ServiceManager反射调用构造方法构造
public Lifecycle(Context context) {
super(context);
mService = new ActivityManagerService(context);
}
@Override
public void onStart() {
mService.start(); // AMS 启动
}
}
public ActivityManagerService(Context systemContext) {
mContext = systemContext; // 赋值 SystemServer的context
mFactoryTest = FactoryTest.getMode();
// 赋值 SystemServer 的ActivityThread
mSystemThread = ActivityThread.currentActivityThread();
// 创建带Handler的前台线程和MainHandler，AMS内部通信用
mHandlerThread = new ServiceThread(TAG,
android.os.Process.THREAD_PRIORITY_FOREGROUND, false);
mHandlerThread.start();
mHandler = new MainHandler(mHandlerThread.getLooper());
// 创建UIHandler，AMS所需要的界面交互用
mUiHandler = new UiHandler();
// 创建前台广播接受队列 和 后台广播接受队列
mFgBroadcastQueue = new BroadcastQueue(this, mHandler,
"foreground", BROADCAST_FG_TIMEOUT, false);
mBgBroadcastQueue = new BroadcastQueue(this, mHandler,
"background", BROADCAST_BG_TIMEOUT, true);
mBroadcastQueues[0] = mFgBroadcastQueue;
mBroadcastQueues[1] = mBgBroadcastQueue;
// 创建Service 和Provider 容器
mServices = new ActiveServices(this);
mProviderMap = new ProviderMap(this);
// 创建 /data/system 目录
File dataDir = Environment.getDataDirectory();
File systemDir = new File(dataDir, "system");
systemDir.mkdirs();
// 创建 电量统计服务
mBatteryStatsService = new BatteryStatsService(systemDir, mHandler);
mBatteryStatsService.getActiveStatistics().readLocked();
mBatteryStatsService.scheduleWriteToDisk();
mOnBattery = DEBUG_POWER ? true
: mBatteryStatsService.getActiveStatistics().getIsOnBattery();
mBatteryStatsService.getActiveStatistics().setCallback(this);
// 创建 进程统计服务
mProcessStats = new ProcessStatsService(this, new File(systemDir, "procstats"));
mAppOpsService = new AppOpsService(new File(systemDir, "appops.xml"), mHandler);
mGrantFile = new AtomicFile(new File(systemDir, "urigrants.xml"));
// User 0 is the first and only user that runs at boot.
mStartedUsers.put(UserHandle.USER_OWNER, new UserState(UserHandle.OWNER, true));
mUserLru.add(UserHandle.USER_OWNER);
updateStartedUserArrayLocked();
...
// CPU 追踪器初始化
mProcessCpuTracker.init();
// 创建Activity相关对象
mRecentTasks = new RecentTasks(this);
mStackSupervisor = new ActivityStackSupervisor(this, mRecentTasks);
mTaskPersister = new TaskPersister(systemDir, mStackSupervisor, mRecentTasks);
// 创建‘CpuTracker’的现场
mProcessCpuThread = new Thread("CpuTracker") {
@Override
public void run() {
while (true) {
synchronized(this) {
... // 更新cpu状态
updateCpuStatsNow();
}
}
}
};
...
}
private void start() {
// 启动 CPU 监控线程，在启动 CPU 监控线程之前，首先将进程复位
// 注册电池状态服务和权限管理服务
Process.removeAllProcessGroups(); //移除所有的进程组
mProcessCpuThread.start(); //启动CpuTracker线程
//启动电池统计服务
mBatteryStatsService.publish(mContext);
mAppOpsService.publish(mContext);
//创建LocalService，并添加到LocalServices
LocalServices.addService(ActivityManagerInternal.class, new LocalService());
}
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