三、StatusBarManagerService.java
前面，我们启动PhoneStatusBar时会调用StatusBar的start函数，在这里和StatusbarManagerService
建立联系。
StatusBar.java中
mBarService.registerStatusBar(mCommandQueue, iconList, notificationKeys, notifications,
switches, binders);
public class StatusBarManagerService extends IStatusBarService.Stub
implements WindowManagerService.OnHardKeyboardStatusChangeListener
{
public StatusBarManagerService(Context context, WindowManagerService windowManager) {
mContext = context;
mWindowManager = windowManager;
mWindowManager.setOnHardKeyboardStatusChangeListener(this);
final Resources res = context.getResources();
//这里，获取config_statusBarIcons.xm中定义的显示icon的数组
mIcons.defineSlots(res.
getStringArray(com.Android.internal.R.array.config_statusBarIcons));
}
}
public void registerStatusBar(IStatusBar bar, StatusBarIconList iconList,
List<IBinder> notificationKeys, List<StatusBarNotification> notifications,
int switches[], List<IBinder> binders) {
//这个bar就是CommandQueue在PhoneStatusbar中的实现callbacks
mBar = bar;
synchronized (mIcons) {
//将初始化这个service时获取的config_statusBarIcons数组中字符串保存到iconList，
//也就是传递给PhoneStatusBar使用了
iconList.copyFrom(mIcons);
}
synchronized (mNotifications) {
for (Map.Entry<IBinder,StatusBarNotification> e: mNotifications.entrySet()) {
notificationKeys.add(e.getKey());
notifications.add(e.getValue());
}
}
……
}
public void setIcon(String slot, String iconPackage, int iconId, int iconLevel,
String contentDescription) {
enforceStatusBar();
synchronized (mIcons) {
//也就是当前这个slot在数组中的index
int index = mIcons.getSlotIndex(slot);
//如果没有定义的slot，就报异常
if (index < 0) {
throw new SecurityException("invalid status bar icon slot: " + slot);
}
//这才正式创建StatusBarIcon，iconPackage是PhoneStatusBar的，iconId就是我们设置的
StatusBarIcon icon = new StatusBarIcon(iconPackage, iconId, iconLevel, 0,
contentDescription);
//数组中对应的index设置了icon
mIcons.setIcon(index, icon);
if (mBar != null) {
try {
mBar.setIcon(index, icon);
} catch (RemoteException ex) {
}
}
}
}
CommandQueue.java
public void setIcon(int index, StatusBarIcon icon) {
synchronized (mList) {
//mList用的也是StatusBarManagerService中初始化的iconList
int what = MSG_ICON | index;
mHandler.removeMessages(what);
mHandler.obtainMessage(what, OP_SET_ICON, 0, icon.clone()).sendToTarget();
}
}
private final class H extends Handler {
public void handleMessage(Message msg) {
final int what = msg.what & MSG_MASK;
switch (what) {
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;
//mList
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;
}
}
}
最后就是调用PhoneStatusBar的addIcon。至此，就用StatusBar显示了icon