1，Status Bar 上的icon 的配置
android 预定义需要在status bar上显示的icon.其在framework/base/core/res/res/values/config.xml
<!-- Component to be used as the status bar service. Must implement the IStatusBar interface. This name is in the ComponentName flattened format (package/class) --> <string name="config_statusBarComponent">com.android.systemui/com.android.systemui.statusbar.StatusBarService</string> <!-- Do not translate. Defines the slots for the right-hand side icons. That is to say, the icons in the status bar that are not notifications. --> <string-array name="config_statusBarIcons"> <item><xliff:g id="id">ime</xliff:g></item> <item><xliff:g id="id">sync_failing</xliff:g></item> <item><xliff:g id="id">sync_active</xliff:g></item> <item><xliff:g id="id">gps</xliff:g></item> <item><xliff:g id="id">bluetooth</xliff:g></item> <item><xliff:g id="id">nfc</xliff:g></item> <item><xliff:g id="id">tty</xliff:g></item> <item><xliff:g id="id">speakerphone</xliff:g></item> <item><xliff:g id="id">mute</xliff:g></item> <item><xliff:g id="id">volume</xliff:g></item> <item><xliff:g id="id">wifi</xliff:g></item> <item><xliff:g id="id">cdma_eri</xliff:g></item> <item><xliff:g id="id">data_connection</xliff:g></item> <item><xliff:g id="id">phone_evdo_signal</xliff:g></item> <item><xliff:g id="id">phone_signal</xliff:g></item> <item><xliff:g id="id">battery</xliff:g></item> <item><xliff:g id="id">alarm_clock</xliff:g></item> <item><xliff:g id="id">headset</xliff:g></item> <item><xliff:g id="id">secure</xliff:g></item> <item><xliff:g id="id">clock</xliff:g></item> </string-array>
这些icon在这个string array的位置就决定了其在status bar 上显示的位置了。我们可以从code里面得出该结论。所以当你要调换icon的顺序时，改动这个config.xml就可以了。下面我们来看如何得到该结论：
1,在StatusBarManagerService 初始化的时候就会读取config.xml下icons 的String array.
1)StatusBarManagerService.java
StatusBarIconList mIcons = new StatusBarIconList();public StatusBarManagerService(Context context) { mContext = context; final Resources res = context.getResources(); mIcons.defineSlots(res.getStringArray(com.android.internal.R.array.config_statusBarIcons)); }2)StatusBarIconList.java
public void defineSlots(String[] slots) { final int N = slots.length; String[] s = mSlots = new String[N]; for (int i=0; i<N; i++) { s[i] = slots[i]; Slog.i("", "StatusBarIconList "+i+" : "+ slots[i]); } mIcons = new StatusBarIcon[N]; }这里的mSlots这个string array就是保存了刚才config.xml中读出来的,并new 对应数目的StatusBarIcon。
3)StatusBarPolicy.java
// battery mService.setIcon("battery", com.android.internal.R.drawable.stat_sys_battery_unknown, 0);....mService.setIcon("data_connection", R.drawable.stat_sys_data_connected_g, 0);....4)StatusBarManager.java
public void setIcon(String slot, int iconId, int iconLevel) { try { mService.setIcon(slot, mContext.getPackageName(), iconId, iconLevel); Slog.i("StatusBarManager", "setIcon: slot"+slot+" packageName:"+ mContext.getPackageName()); } catch (RemoteException ex) { // system process is dead anyway. throw new RuntimeException(ex); } }5)StatusBarManagerService.java
public void setIcon(String slot, String iconPackage, int iconId, int iconLevel) { enforceStatusBar(); synchronized (mIcons) { int index = mIcons.getSlotIndex(slot); if (index < 0) { throw new SecurityException("invalid status bar icon slot: " + slot); } StatusBarIcon icon = new StatusBarIcon(iconPackage, iconId, iconLevel); Slog.d(TAG, "setIcon slot=" + slot + " index=" + index + " icon=" + icon); mIcons.setIcon(index, icon); if (mBar != null) { try { mBar.setIcon(index, icon); } catch (RemoteException ex) { } } } } // ================================================================================ // Callbacks from the status bar service. // ================================================================================ public void registerStatusBar(IStatusBar bar, StatusBarIconList iconList, List<IBinder> notificationKeys, List<StatusBarNotification> notifications) { enforceStatusBarService(); Slog.i(TAG, "registerStatusBar bar=" + bar); mBar = bar; synchronized (mIcons) { iconList.copyFrom(mIcons); } synchronized (mNotifications) { Slog.i(TAG, "mNotifications=" + mNotifications.); for (Map.Entry<IBinder,StatusBarNotification> e: mNotifications.entrySet()) { notificationKeys.add(e.getKey()); notifications.add(e.getValue()); } } }这里的registerStatusBar会在StatusBarService的onCreate的时候调用：
StatusBarIconList iconList = new StatusBarIconList(); ArrayList<IBinder> notificationKeys = new ArrayList<IBinder>(); ArrayList<StatusBarNotification> notifications = new ArrayList<StatusBarNotification>(); mCommandQueue = new CommandQueue(this, iconList); mBarService = IStatusBarService.Stub.asInterface( ServiceManager.getService(Context.STATUS_BAR_SERVICE)); hardware = IHardwareService.Stub.asInterface(ServiceManager.getService("hardware")); // helen try { mBarService.registerStatusBar(mCommandQueue, iconList, notificationKeys, notifications); } catch (RemoteException ex) { // If the system process isn't there we're doomed anyway. }6）CommandQueue。java
public void setIcon(int index, StatusBarIcon icon) { synchronized (mList) { int what = MSG_ICON | index; mHandler.removeMessages(what); mHandler.obtainMessage(what, OP_SET_ICON, 0, icon.clone()).sendToTarget(); } } case MSG_ICON: { final int index = msg.what & INDEX_MASK; final int viewIndex = mList.getViewIndex(index); switch (msg.arg1) { case OP_SET_ICON: { StatusBarIcon icon = (StatusBarIcon)msg.obj; StatusBarIcon old = mList.getIcon(index); if (old == null) { mList.setIcon(index, icon); mCallbacks.addIcon(mList.getSlot(index), index, viewIndex, icon); } else { mList.setIcon(index, icon); mCallbacks.updateIcon(mList.getSlot(index), index, viewIndex, old, icon); } break; } case OP_REMOVE_ICON: if (mList.getIcon(index) != null) { mList.removeIcon(index); mCallbacks.removeIcon(mList.getSlot(index), index, viewIndex); } break; } break; }7)StatusBarService.java
public void addIcon(String slot, int index, int viewIndex, StatusBarIcon icon) { if (SPEW_ICONS) { Slog.d(TAG, "addIcon slot=" + slot + " index=" + index + " viewIndex=" + viewIndex + " icon=" + icon); } StatusBarIconView view = new StatusBarIconView(this, slot); view.set(icon); mStatusIcons.addView(view, viewIndex, new LinearLayout.LayoutParams(mIconSize, mIconSize)); }