systemui 學習筆記一

1.systemUI的啓動

2.systemUI包含哪些內容

一、systemUI的啓動

      ServerThread 中添加service：

                if (!headless) {
                    startSystemUi(contextF);
                }

  startSystemUi  的定義：

 static final void startSystemUi(Context context) {
        Intent intent = new Intent();
        intent.setComponent(new ComponentName("com.android.systemui",
                    "com.android.systemui.SystemUIService"));
        //Slog.d(TAG, "Starting service: " + intent);
        context.startServiceAsUser(intent, UserHandle.OWNER);
    }

這裏可以看到啓動了systemUIservice，看其oncreat方法：

   private final Class<?>[] SERVICES = new Class[] {
            com.android.systemui.recent.Recents.class,
            com.android.systemui.statusbar.SystemBars.class,
            com.android.systemui.usb.StorageNotification.class,
            com.android.systemui.power.PowerUI.class,
            com.android.systemui.media.RingtonePlayer.class,
            com.android.systemui.settings.SettingsUI.class,
        };

    /**
     * Hold a reference on the stuff we start.
     */
    private final SystemUI[] mServices = new SystemUI[SERVICES.length];

   @Override
    public void onCreate() {
        HashMap<Class<?>, Object> components = new HashMap<Class<?>, Object>();
        final int N = SERVICES.length;
        for (int i=0; i<N; i++) {
            Class<?> cl = SERVICES[i];
            Log.d(TAG, "loading: " + cl);
            try {
                mServices[i] = (SystemUI)cl.newInstance();
            } catch (IllegalAccessException ex) {
                throw new RuntimeException(ex);
            } catch (InstantiationException ex) {
                throw new RuntimeException(ex);
            }
            mServices[i].mContext = this;
            mServices[i].mComponents = components;
            Log.d(TAG, "running: " + mServices[i]);
            mServices[i].start();
        }
    }

二、可以看到在systemUI的服務裏面包含了六個項目：Recents、SystemBars、StorageNotification、PowerUI、RingtonePlayer、SettingsUI

    1.先看一下SystemBars的啓動過程：

    

在createAndAddWindows 中就把StatusBarWindowView加入到窗口中