Android之framework开发 - SystemUI启动流程

本人还是初入坑的小白，目前只是做简单的记录，多谢支持

首先分享一个源码库
AospXref

本次基于Android10.0.0-r47

先找到下面路径
/frameworks/base/services/java/com/android/server/SystemServer.java

SystemUI由SystemServer启动

private void run() {
	//...此处省略
	// Start services.
    try {
        traceBeginAndSlog("StartServices");
        startBootstrapServices();
        startCoreServices();
        startOtherServices();
        SystemServerInitThreadPool.shutdown();
    } catch (Throwable ex) {
        Slog.e("System", "******************************************");
        Slog.e("System", "************ Failure starting system services", ex);
        throw ex;
    } finally {
        traceEnd();
    }
}

SystemUI被放在startOtherServices();中，接着我们看向startOtherServices代码

/**
 * Starts a miscellaneous grab bag of stuff that has yet to be refactored and organized.
 */
private void startOtherServices() {
	//...此处省略
	traceBeginAndSlog("StartSystemUI");
    try {
        startSystemUi(context, windowManagerF);
    } catch (Throwable e) {
        reportWtf("starting System UI", e);
    }
    traceEnd();
}

private static void startSystemUi(Context context, WindowManagerService windowManager) {
    Intent intent = new Intent();
    intent.setComponent(new ComponentName("com.android.systemui",
            "com.android.systemui.SystemUIService"));
    intent.addFlags(Intent.FLAG_DEBUG_TRIAGED_MISSING);
    //Slog.d(TAG, "Starting service: " + intent);
    context.startServiceAsUser(intent, UserHandle.SYSTEM);
    windowManager.onSystemUiStarted();
}