Debug abnormal appearence of (Back, Home, Recent) key

說明

大寫：顯示
小寫：消失
*      ：變更狀態

Ex:
06-16 23:26:01.708  1300  1300 D PhoneStatusBar: disable: < expand icons alerts system_info back HOME* RECENT* clock SEARCH* >
Back key -> 維持顯示狀態
Home key -> 變為消失狀態
Recent app key -> 變為消失狀態

Source code:

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
public void disable(int state, boolean animate) {
............
StringBuilder flagdbg = new StringBuilder();
        flagdbg.append("disable: < ");
        flagdbg.append(((state & StatusBarManager.DISABLE_EXPAND) != 0) ? "EXPAND" : "expand");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_EXPAND) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_NOTIFICATION_ICONS) != 0) ? "ICONS" : "icons");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_NOTIFICATION_ICONS) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_NOTIFICATION_ALERTS) != 0) ? "ALERTS" : "alerts");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_NOTIFICATION_ALERTS) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_SYSTEM_INFO) != 0) ? "SYSTEM_INFO" : "system_info");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_SYSTEM_INFO) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_BACK) != 0) ? "BACK" : "back");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_BACK) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_HOME) != 0) ? "HOME" : "home");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_HOME) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_RECENT) != 0) ? "RECENT" : "recent");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_RECENT) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_CLOCK) != 0) ? "CLOCK" : "clock");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_CLOCK) != 0) ? "* " : " ");
        flagdbg.append(((state & StatusBarManager.DISABLE_SEARCH) != 0) ? "SEARCH" : "search");
        flagdbg.append(((diff  & StatusBarManager.DISABLE_SEARCH) != 0) ? "* " : " ");
        flagdbg.append(">");
        Log.d(TAG, flagdbg.toString());
.............
}