虚拟按键隐藏过程log

Android 阅读量

公司最近开始搞Android P的项目，有一天在新的代码上出现了一个奇怪的问题。在点完开机向导后，进入到launcher，发现虚拟按键中的recents不见了，点击那个区域也没反应，但是在系统配置发生改变时（比如切换言）recents又出来了。

刚开始只有一个user版的手机，开机向导过程中的log抓不到，怀疑是别人改了SystemUI造成的也没法验证，为了方便分析问题，只能先编一个userdebug版本。编译时间比较长，闲着也是闲着，就先在代码里看下有没有什么头绪吧。

在SystemUI的代码里搜索关键字“recent”，“disable”，“hide”，最终在StatusBar.java里发现了一个“DISABLE_RECENT”进而找到了framework里的StatusBarManager.java中的以下代码：

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public static final int DISABLE_EXPAND = View.STATUS_BAR_DISABLE_EXPAND;
public static final int DISABLE_NOTIFICATION_ICONS = View.STATUS_BAR_DISABLE_NOTIFICATION_ICONS;
public static final int DISABLE_NOTIFICATION_ALERTS
        = View.STATUS_BAR_DISABLE_NOTIFICATION_ALERTS;
@Deprecated
public static final int DISABLE_NOTIFICATION_TICKER
        = View.STATUS_BAR_DISABLE_NOTIFICATION_TICKER;
public static final int DISABLE_SYSTEM_INFO = View.STATUS_BAR_DISABLE_SYSTEM_INFO;
public static final int DISABLE_HOME = View.STATUS_BAR_DISABLE_HOME;
public static final int DISABLE_RECENT = View.STATUS_BAR_DISABLE_RECENT;
public static final int DISABLE_BACK = View.STATUS_BAR_DISABLE_BACK;
public static final int DISABLE_CLOCK = View.STATUS_BAR_DISABLE_CLOCK;
public static final int DISABLE_SEARCH = View.STATUS_BAR_DISABLE_SEARCH;

@Deprecated
public static final int DISABLE_NAVIGATION = 
        View.STATUS_BAR_DISABLE_HOME | View.STATUS_BAR_DISABLE_RECENT;

public static final int DISABLE_NONE = 0x00000000;

public static final int DISABLE_MASK = DISABLE_EXPAND | DISABLE_NOTIFICATION_ICONS
        | DISABLE_NOTIFICATION_ALERTS | DISABLE_NOTIFICATION_TICKER
        | DISABLE_SYSTEM_INFO | DISABLE_RECENT | DISABLE_HOME | DISABLE_BACK | DISABLE_CLOCK
        | DISABLE_SEARCH;

各种各样的disable，而这些disable都在StatusBar的disable()方法中出现了：

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/**
  * State is one or more of the DISABLE constants from StatusBarManager.
  */
 @Override
 public void disable(int state1, int state2, boolean animate) {
     state2 = mRemoteInputQuickSettingsDisabler.adjustDisableFlags(state2);

     animate &= mStatusBarWindowState != WINDOW_STATE_HIDDEN;
     final int old1 = mDisabled1;
     final int diff1 = state1 ^ old1;
     mDisabled1 = state1;

     final int old2 = mDisabled2;
     final int diff2 = state2 ^ old2;
     mDisabled2 = state2;

     if (DEBUG) {
         Log.d(TAG, String.format("disable1: 0x%08x -> 0x%08x (diff1: 0x%08x)",
             old1, state1, diff1));
         Log.d(TAG, String.format("disable2: 0x%08x -> 0x%08x (diff2: 0x%08x)",
             old2, state2, diff2));
     }

     StringBuilder flagdbg = new StringBuilder();
     flagdbg.append("disable<");
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_EXPAND))                ? 'E' : 'e');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_EXPAND))                ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_NOTIFICATION_ICONS))    ? 'I' : 'i');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_NOTIFICATION_ICONS))    ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_NOTIFICATION_ALERTS))   ? 'A' : 'a');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_NOTIFICATION_ALERTS))   ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_SYSTEM_INFO))           ? 'S' : 's');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_SYSTEM_INFO))           ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_BACK))                  ? 'B' : 'b');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_BACK))                  ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_HOME))                  ? 'H' : 'h');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_HOME))                  ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_RECENT))                ? 'R' : 'r');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_RECENT))                ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_CLOCK))                 ? 'C' : 'c');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_CLOCK))                 ? '!' : ' ');
     flagdbg.append(0 != ((state1 & StatusBarManager.DISABLE_SEARCH))                ? 'S' : 's');
     flagdbg.append(0 != ((diff1  & StatusBarManager.DISABLE_SEARCH))                ? '!' : ' ');
     flagdbg.append("> disable2<");
     flagdbg.append(0 != ((state2 & StatusBarManager.DISABLE2_QUICK_SETTINGS))       ? 'Q' : 'q');
     flagdbg.append(0 != ((diff2  & StatusBarManager.DISABLE2_QUICK_SETTINGS))       ? '!' : ' ');
     flagdbg.append(0 != ((state2 & StatusBarManager.DISABLE2_SYSTEM_ICONS))         ? 'I' : 'i');
     flagdbg.append(0 != ((diff2  & StatusBarManager.DISABLE2_SYSTEM_ICONS))         ? '!' : ' ');
     flagdbg.append(0 != ((state2 & StatusBarManager.DISABLE2_NOTIFICATION_SHADE))   ? 'N' : 'n');
     flagdbg.append(0 != ((diff2  & StatusBarManager.DISABLE2_NOTIFICATION_SHADE))   ? '!' : ' ');
     flagdbg.append('>');
     Log.d(TAG, flagdbg.toString());

     if ((diff1 & StatusBarManager.DISABLE_EXPAND) != 0) {
         if ((state1 & StatusBarManager.DISABLE_EXPAND) != 0) {
             animateCollapsePanels();
         }
     }

     if ((diff1 & StatusBarManager.DISABLE_RECENT) != 0) {
         if ((state1 & StatusBarManager.DISABLE_RECENT) != 0) {
             // close recents if it's visible
             mHandler.removeMessages(MSG_HIDE_RECENT_APPS);
             mHandler.sendEmptyMessage(MSG_HIDE_RECENT_APPS);
         }
     }

     if ((diff1 & StatusBarManager.DISABLE_NOTIFICATION_ALERTS) != 0) {
         mEntryManager.setDisableNotificationAlerts(
                 (state1 & StatusBarManager.DISABLE_NOTIFICATION_ALERTS) != 0);
     }

     if ((diff2 & StatusBarManager.DISABLE2_QUICK_SETTINGS) != 0) {
         updateQsExpansionEnabled();
     }

     if ((diff2 & StatusBarManager.DISABLE2_NOTIFICATION_SHADE) != 0) {
         updateQsExpansionEnabled();
         if ((state1 & StatusBarManager.DISABLE2_NOTIFICATION_SHADE) != 0) {
             animateCollapsePanels();
         }
     }
 }

其中mDisabled1和mDisabled2表示之前的disable状态，state1和state2表示新的状态，diff1和diff2表示发生改变的标志位。状态的改变会记录在flagdbg中从代码中来看，如果新的state中包含某个disable标志位，则log中用一个大写字母表示，否则用小写表示；如果某个标志位发生改变，则字母后面会加上一个“!”。三个虚拟按键分别对应B(b),H(b),R(r).

在刷机后抓取了开机向导过程中的log，从其中找到了以下信息:

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09-21 14:21:36.096  1432  1432 D StatusBar: disable1: 0x00000000 -> 0x03a50000 (diff1: 0x03a50000)
09-21 14:21:36.097  1432  1432 D StatusBar: disable2: 0x00000000 -> 0x00000010 (diff2: 0x00000010)
09-21 14:21:36.097  1432  1432 D StatusBar: disable<E!i A!s b H!R!C!S!> disable2<q i n >

该条记录表示E，A，H，R，C，S等标志位发生了变化。这里只关心三个虚拟按键，b表示back按键还是可用的而且没有发生变化；H!表示home键状态从enable变为disable了;R!表示recents按键也从enable变为了disable。

上面这些内容比较好理解，仅作记录。关于最开始提到的问题，最后发现别人添加功能改出来的，这里就不关心了。

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