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SystemUI源码分析
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<div class="markdown_views">此篇文章针对android5.1 systemUI源码进行分析

下面我们进行分析， 
1.1 frameworks/base/packages/SystemUI/AndroidManifest.xml 
我们先来看下这个文件下的内容： 
<a href="http://lib.csdn.net/base/android" class="replace_word" title="Android知识库" target="_blank" style="color:#df3434; font-weight:bold;">Android</a>:name=”.SystemUIApplication” 
android:persistent=”true” 
android:allowClearUserData=”false” 
android:allowBackup=”false” 
android:hardwareAccelerated=”true” 
android:label=”@string/app_label” 
android:icon=”@drawable/icon” 
android:process=”com.android.systemui” 
android:supportsRtl=”true” 
android:theme=”@style/systemui_theme”> 
……………………………………… 
android:exported=”true” 
/> 
android:process=”:screenshot” 
android:exported=”false” /> 
android:exported=”true” /> 
android:permission=”android.permission.BIND_WALLPAPER” 
android:exported=”true” /> 
……………………………………… 
……………………………………… 
………………………………………

<pre><code> 我们可以看到，AndroidManifest.xml注册了很多的service 和广播，那么是怎么启动的服务呢？
我们继续看下这个所注册的三个服务，
SystemUIService /
.screenshot.TakeScreenshotService /
.LoadAverageService/.ImageWallpaper
</code></pre>

这三个服务是怎么启动的呢，我们仔细来看下这句注释： 
“Broadcast receiver that gets the broadcast at boot time and starts up everything else.” 
看里这个注释，我们就应该知道，首先启动的应该是SystemUIService这个服务。 
那么SystemUIService这个服务是怎么启动的呢，启动服务我们知道多数的通用方法是 
startService(intent)和bindService(intent) 
那么我们就在SystemUI下全局搜索“SystemUIService”，可以看下结果 
frameworks/base/services/<a href="http://lib.csdn.net/base/java" class="replace_word" title="Java 知识库" target="_blank" style="color:#df3434; font-weight:bold;">Java</a>/com/android/server/SystemServer.java: “com.android.systemui.SystemUIService”)); 
我们打开SystemServer.java这个文件来看下是怎么调用的，

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); 
}

原来是 intent.setComponent()启动了SystemUIService这个服务。

1.2 frameworks/base/packages/SystemUI/src/com/android/systemui/SystemUIService.java 

下面我们来分析一下SystemUIService.java:

<pre class="prettyprint" name="code"><code class="hljs java has-numbering">@Override
public void onCreate() {
super.onCreate();
((SystemUIApplication) getApplication()).startServicesIfNeeded();
}</code><ul class="pre-numbering" style="opacity: 0;"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li></ul><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li></ul></pre>

在oSystemUIService中的onCreate只调用了 
((SystemUIApplication) getApplication()).startServicesIfNeeded(); 
这么一个语句，下面我们来看看startServicesIfNeeded()这里面有啥东西

<pre><code>public void startServicesIfNeeded() {
if (mServicesStarted) {
return;
}
if (!mBootCompleted) {
// check to see if maybe it was already completed long before we began
// see ActivityManagerService.finishBooting()
if ("1".equals(SystemProperties.get("sys.boot_completed"))) {
mBootCompleted = true;
if (DEBUG) Log.v(TAG, "BOOT_COMPLETED was already sent");
}
}

Log.v(TAG, "Starting SystemUI services.");
final int N = SERVICES.length;
for (int i=0; i<N; i++) {
Class<?> cl = SERVICES[i];
if (DEBUG) 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 = mComponents;
if (DEBUG) Log.d(TAG, "running: " + mServices[i]);
mServices[i].start();

if (mBootCompleted) {
mServices[i].onBootCompleted();
}
}
mServicesStarted = true;
}
</code></pre>

}

在这里我们看到mServices启动了不止一个服务，那么这些都是那些服务呢， 
我们看这个语句 
mServices[i] = (SystemUI)cl.newInstance(); 
这里的语句付给了mServices[i].start()一个对象， 
我们往上去找，可以看到这Class cl = SERVICES[i]; 
cl是SERVICES[i]这个数组中的一个值，在java的定义中，我们可以看到这个SERVICES的初始化 
private final Class[] SERVICES = new Class[] { 
com.android.systemui.keyguard.KeyguardViewMediator.class, 
com.android.systemui.recent.Recents.class, 
com.android.systemui.volume.VolumeUI.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 
}； 
SERVICES中添加要start的所有服务选项，这里，我们重点关注一下 
com.android.systemui.statusbar.SystemBars.class, 
这是我们进行下一步分析的重要线索。

1.3 frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/SystemBars.java

我们看下SystemBars.java这个文件中的start()中到底写了些什么东西，

<pre><code>public void start() {
if (DEBUG) Log.d(TAG, "start");
mServiceMonitor = new ServiceMonitor(TAG, DEBUG,
mContext, Settings.Secure.BAR_SERVICE_COMPONENT, this);
mServiceMonitor.start(); // will call onNoService if no remote service is found
}
</code></pre>

这里，启动了另外一个服务mServiceMonitor,除了启动这个服务外什么都没有做，那我们继续往下面去看看 
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/ServiceMonitor.java 
在这个文件里面，对star()方法的调用 
public void start() { 
………………… 
mHandler.sendEmptyMessage(MSG_START_SERVICE); 
} 
在这个函数里，这个sendEmptyMessage语句是一个非常关键的调用，这个调用也是启动了一个服务，我们去看下这个mHandler都干了些啥事，

private final Handler mHandler = new Handler() { 
public void handleMessage(Message msg) { 
switch(msg.what) { 
case MSG_START_SERVICE: 
startService(); 
break; 
case MSG_CONTINUE_START_SERVICE: 
continueStartService(); 
break; 
case MSG_STOP_SERVICE: 
stopService(); 
break; 
case MSG_PACKAGE_INTENT: 
packageIntent((Intent)msg.obj); 
break; 
case MSG_CHECK_BOUND: 
checkBound(); 
break; 
case MSG_SERVICE_DISCONNECTED: 
serviceDisconnected((ComponentName)msg.obj); 
break; 
} 
} 
};

在这里我们看到 
case MSG_START_SERVICE: 
startService(); 
break; 
这里才是真正的启动了一个服务，mCallbacks.onNoService(); 
private void startService() { 
mServiceName = getComponentNameFromSetting(); 
if (mDebug) Log.d(mTag, “startService mServiceName=” + mServiceName); 
if (mServiceName == null) { 
mBound = false; 
mCallbacks.onNoService(); 
} else { 
long delay = mCallbacks.onServiceStartAttempt(); 
mHandler.sendEmptyMessageDelayed(MSG_CONTINUE_START_SERVICE, delay); 
} 
} 
我们来看下if (mServiceName == null) 这个判断的结果是怎么来的， 
private ComponentName getComponentNameFromSetting() { 
String cn = Settings.Secure.getStringForUser(mContext.getContentResolver(), 
mSettingKey, UserHandle.USER_CURRENT); 
return cn == null ? null : ComponentName.unflattenFromString(cn); 
} 
由以上的代码我们可知，cn返回的是null值，在startService()中就调用了 mCallbacks.onNoService();

我们来看下frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/SystemBars.java 
onNoService()的调用，

public void onNoService() { 
if (DEBUG) Log.d(TAG, “onNoService”); 
createStatusBarFromConfig(); 
}

private void createStatusBarFromConfig() { 
………………………………….. 
mStatusBar.mContext = mContext; 
mStatusBar.mComponents = mComponents; 
mStatusBar.start(); 
………………………………….. 
} 
在createStatusBarFromConfig()中终于有了实际的行动来进行关于status的一下相关操作了，一直到这里，其实前面所做的都是一些服务的调用，并没有对screen进行任何的view类级别的操作，其实上面的流程，只是在系统框架先进行的一些服务注册，及逻辑方面的一些准备。

1.4 frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java 
下面我们来着重分析下BaseStatusBar.start().

public void start() { 
……………………. 
createAndAddWindows(); 
……………………. 
} 
在BaseStatusBar.start()中，这个语句是重点中的重点，是对整个status的布局，我们进到这个函数中去看个究竟 
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java 
public void createAndAddWindows() { 
addStatusBarWindow(); 
} 
在createAndAddWindows中也只是调用了这么一个函数，没有其他的东西了，我们接着看 
addStatusBarWindow(); 
其实在addStatusBarWindow所做的东西也不多，就是两步 
makeStatusBarView()和mStatusBarWindowManager.add(); 
但是这两步确实非常重要的两部。 
private void addStatusBarWindow() { 
makeStatusBarView(); 
mStatusBarWindowManager = new StatusBarWindowManager(mContext); 
mStatusBarWindowManager.add(mStatusBarWindow, getStatusBarHeight()); 
}

我们先来看看akeStatusBarView()这个里面是什么情况 
protected PhoneStatusBarView makeStatusBarView() { 
………………………… 
mStatusBarWindow = (StatusBarWindowView) View.inflate(context,R.layout.super_status_bar, null); 
…………………………..

}

我们在super_status_bar.xml中这个文件可以看到 
<-com.android.systemui.statusbar.phone.StatusBarWindowView 
//xmlns:android=”http://schemas.android.com/apk/res/android” 
android:layout_width=”match_parent” 
android:layout_height=”match_parent” 
android:fitsSystemWindows=”true”> 
………………………….. 
<-com.android.systemui.statusbar.ScrimView android:id=”@+id/scrim_behind” 
android:layout_width=”match_parent” 
android:layout_height=”match_parent” 
android:importantForAccessibility=”no” />

<pre><code><include layout="@layout/status_bar"
android:layout_width="match_parent"
android:layout_height="@dimen/status_bar_height" />
</code></pre>

…………………………………… 
<-com.android.systemui.statusbar.phone.PanelHolder 
android:id=”@+id/panel_holder” 
android:layout_width=”match_parent” 
android:layout_height=”match_parent” 
android:background=”@color/transparent” > 
<-include layout=”@layout/status_bar_expanded” 
android:layout_width=”match_parent” 
android:layout_height=”match_parent” 
android:visibility=”gone” /> 
<-/com.android.systemui.statusbar.phone.PanelHolder> 
在这里，我们主要注意上面所示status_bar / panel_holder才是我们要关注的重中之重，是我们整个view的最直观的显示，也是客户化定制比较多的地方，下面我们来进行进一步的细分。

1.5 frameworks/base/packages/SystemUI/res/layout/status_bar.xml

<-com.android.systemui.statusbar.phone.PhoneStatusBarView 
23 xmlns:android=”http://schemas.android.com/apk/res/android” 
24 xmlns:systemui=”http://schemas.android.com/apk/res/com.android.systemui” 
25 android:id=”@+id/status_bar” 
26 android:background=”@drawable/system_bar_background” 
27 android:orientation=”vertical” 
28 android:focusable=”true” 
29 android:descendantFocusability=”afterDescendants” 
30 > 
……………………………… 
71 <-com.android.systemui.statusbar.phone.IconMerger android:id=”@+id/notificationIcons” 
72 android:layout_width=”match_parent” 
73 android:layout_height=”match_parent” 
74 android:layout_alignParentStart=”true” 
75 android:gravity=”center_vertical” 
76 android:orientation=”horizontal”/> 
77 <-/com.android.keyguard.AlphaOptimizedLinearLayout> 
78 <-/com.android.systemui.statusbar.AlphaOptimizedFrameLayout> 
79 
80 <-com.android.keyguard.AlphaOptimizedLinearLayout android:id=”@+id/system_icon_area” 
81 android:layout_width=”wrap_content” 
82 android:layout_height=”match_parent” 
83 android:orientation=”horizontal” 
84 > 
85 
86 <-include layout=”@layout/system_icons” /> 
87 
88 <-com.android.systemui.statusbar.policy.Clock 
89 android:id=”@+id/clock” 
90 android:textAppearance=”@style/TextAppearance.StatusBar.Clock” 
91 android:layout_width=”wrap_content” 
92 android:layout_height=”match_parent” 
93 android:singleLine=”true” 
94 android:paddingStart=”7dp” 
95 android:gravity=”center_vertical|start” 
96 /> 
97 <-/com.android.keyguard.AlphaOptimizedLinearLayout> 
98 <-/LinearLayout>

我们来看下对比图是怎样的： 
<img src="http://img.blog.csdn.net/20150717095100653" alt="" title="">

<img src="http://img.blog.csdn.net/20150717100914320" alt="" title=""> ———–android:id= “@+id/notificationIcons” 
该部分内容显示USB/T卡/wifi链接等一些通知选项图标。 
<img src="http://img.blog.csdn.net/20150717101353376" alt="" title=""> ———–android:id=”@+id/system_icon_area” 
该部分内容主要显示的是SIM卡/电池/时间等…………………

1.6 frameworks/base/packages/SystemUI/res/layout/status_bar_expanded.xml 
我们先来看看这个文件中所码的内容：

<-com.android.systemui.statusbar.phone.NotificationPanelView 
22 xmlns:android=”http://schemas.android.com/apk/res/android” 
23 xmlns:systemui=”http://schemas.android.com/apk/res/com.android.systemui” 
24 android:id=”@+id/notification_panel” 
25 android:layout_width=”match_parent” 
26 android:layout_height=”match_parent” 
27 android:background=”@android:color/transparent” 
28 > 
29 
30 <-include 
31 layout=”@layout/carrier_label_group” 
32 android:layout_height=”wrap_content” 
33 android:layout_width=”match_parent” 
34 android:layout_marginBottom=”@dimen/close_handle_height” 
35 android:layout_gravity=”bottom” 
36 /> 
37 
38 <-include 
39 layout=”@layout/keyguard_status_view” 
40 android:layout_height=”wrap_content” 
41 android:visibility=”gone” /> 
42 
43 <-TextView 
44 android:id=”@+id/emergency_calls_only” 
45 android:textAppearance=”@style/TextAppearance.StatusBar.Expanded.Network.EmergencyOnly” 
46 android:layout_height=”wrap_content” 
47 android:layout_width=”match_parent” 
48 android:padding=”4dp” 
49 android:gravity=”center” 
50 android:visibility=”gone” 
51 /> 
52 
53 <-com.android.systemui.statusbar.phone.NotificationsQuickSettingsContainer 
54 android:layout_width=”match_parent” 
55 android:layout_height=”match_parent” 
56 android:layout_gravity=”@integer/notification_panel_layout_gravity” 
57 android:id=”@+id/notification_container_parent” 
58 android:clipToPadding=”false” 
59 android:clipChildren=”false”> 
60 
<-com.android.systemui.statusbar.phone.ObservableScrollView 
62 android:id=”@+id/scroll_view” 
63 android:layout_width=”@dimen/notification_panel_width” 
64 android:layout_height=”match_parent” 
65 android:layout_gravity=”@integer/notification_panel_layout_gravity” 
66 android:scrollbars=”none” 
67 android:overScrollMode=”never” 
68 android:fillViewport=”true”> 
69 <-LinearLayout 
70 android:layout_width=”match_parent” 
71 android:layout_height=”wrap_content” 
72 android:orientation=”vertical”> 
73 <-include 
74 layout=”@layout/qs_panel” 
75 android:layout_marginTop=”@dimen/status_bar_header_height_expanded” 
76 android:layout_width=”match_parent” 
77 android:layout_height=”wrap_content” 
78 android:layout_marginLeft=”@dimen/notification_side_padding” 
79 android:layout_marginRight=”@dimen/notification_side_padding”/> 
80 
81  
82  
83 <-View 
84 android:id=”@+id/reserve_notification_space” 
85 android:layout_height=”@dimen/min_stack_height” 
86 android:layout_width=”match_parent” 
87 android:layout_marginTop=”@dimen/notifications_top_padding” /> 
88 
89 <-View 
90 android:layout_height=”@dimen/notification_side_padding” 
91 android:layout_width=”match_parent” /> 
92 <-/LinearLayout> 
93 <-/com.android.systemui.statusbar.phone.ObservableScrollView> 
94 
95 <-com.android.systemui.statusbar.stack.NotificationStackScrollLayout 
96 android:id=”@+id/notification_stack_scroller” 
97 android:layout_width=”@dimen/notification_panel_width” 
98 android:layout_height=”match_parent” 
99 android:layout_gravity=”@integer/notification_panel_layout_gravity” 
100 android:layout_marginTop=”-10dp” 
101 android:layout_marginBottom=”@dimen/close_handle_underlap” 
102 android:importantForAccessibility=”no” /> 
103 
104 <-ViewStub 
105 android:id=”@+id/keyguard_user_switcher” 
106 android:layout=”@layout/keyguard_user_switcher” 
android:layout_height=”match_parent” 
108 android:layout_width=”match_parent” /> 
109 
110 <-include 
111 layout=”@layout/keyguard_status_bar” 
112 android:visibility=”invisible” /> 
113 
114 <-/com.android.systemui.statusbar.phone.NotificationsQuickSettingsContainer> 
115 
116 <-include 
117 layout=”@layout/keyguard_bottom_area” 
118 android:visibility=”gone” /> 
119 
120 <-include layout=”@layout/status_bar_expanded_header” /> 
121 
122 <-com.android.systemui.statusbar.AlphaOptimizedView 
123 android:id=”@+id/qs_navbar_scrim” 
124 android:layout_height=”96dp” 
125 android:layout_width=”match_parent” 
126 android:layout_gravity=”bottom” 
127 android:visibility=”invisible” 
128 android:background=”@drawable/qs_navbar_scrim” /> 
129 
130 <-/com.android.systemui.statusbar.phone.NotificationPanelView>

我们先来看看真机上的效果图： 
<img src="http://img.blog.csdn.net/20150717104110154" alt="这里写图片描述" title=""> 
这就是我们真机上的效果图，这是我们status展开后的效果图，没有展开的我们上面已经分析过了，这里就不再重复。

下面我们来看下这个效果图主要是由那些部分组合而成的， 
<img src="http://img.blog.csdn.net/20150717104340518" alt="这里写图片描述" title=""> 
这个部分我们看到，并没有在这status_bar_expanded.xml中直接进行定义，但是我们可以通过 
android:id=”@+id/header” 
这个ID反方向去寻找在status_bar_expanded.xml中是怎么调用的，我们通过搜索知道 
android:id=”@+id/header” 
这个其实是在 
status_bar_expanded_header.xml 
这里进行定义的，找到这里，我们就能清楚的看到，其实在status_bar_expanded.xml中有对status_bar_expanded_header.xml的调用， 
<-include layout=”@layout/status_bar_expanded_header” /> 
到了这里，我们就不继续对status_bar_expanded_header.xml这个文件进行分析了，进入到该文件中，我们能清楚明白的看到各个id的应用。

下面我们继续看最地下的通知信息栏是在哪里加载的，如下如所示： 
<img src="http://img.blog.csdn.net/20150717105733575" alt="这里写图片描述" title=""> 
在这里，该部分内容是在 
<-com.android.systemui.statusbar.stack.NotificationStackScrollLayout 
96 android:id=”@+id/notification_stack_scroller” 
97 android:layout_width=”@dimen/notification_panel_width” 
98 android:layout_height=”match_parent” 
99 android:layout_gravity=”@integer/notification_panel_layout_gravity” 
100 android:layout_marginTop=”-10dp” 
101 android:layout_marginBottom=”@dimen/close_handle_underlap” 
102 android:importantForAccessibility=”no” /> 
这里进行添加的，我们可以看到otification_stack_scroller其实在这个效果图里面是没有展开的，而是重叠在一起的，但是我们在这里不进行进一步的分析。

现在，我们来看最后一部分内容，就是快捷键的使用，我们先看下效果图，如下： 
<img src="http://img.blog.csdn.net/20150717110301903" alt="这里写图片描述" title=""> 
通过android:id的定位，我们知道，该部分内容是在这里 
<-com.android.systemui.statusbar.phone.ObservableScrollView 
62 android:id=”@+id/scroll_view” 
63 android:layout_width=”@dimen/notification_panel_width” 
64 android:layout_height=”match_parent” 
65 android:layout_gravity=”@integer/notification_panel_layout_gravity” 
66 android:scrollbars=”none” 
67 android:overScrollMode=”never” 
68 android:fillViewport=”true”> 
69 <-LinearLayout 
70 android:layout_width=”match_parent” 
71 android:layout_height=”wrap_content” 
72 android:orientation=”vertical”> 
73 <-include 
74 layout=”@layout/qs_panel” 
75 android:layout_marginTop=”@dimen/status_bar_header_height_expanded” 
76 android:layout_width=”match_parent” 
77 android:layout_height=”wrap_content” 
78 android:layout_marginLeft=”@dimen/notification_side_padding” 
79 android:layout_marginRight=”@dimen/notification_side_padding”/> 
80 
81  
82 <-！– Layout height: notification_min_height + bottom_stack_peek_amount –> 
83 <-View 
84 android:id=”@+id/reserve_notification_space” 
85 android:layout_height=”@dimen/min_stack_height” 
86 android:layout_width=”match_parent” 
87 android:layout_marginTop=”@dimen/notifications_top_padding” /> 
88 
89 <-View 
90 android:layout_height=”@dimen/notification_side_padding” 
91 android:layout_width=”match_parent” /> 
92 <-/LinearLayout> 
93 <-/com.android.systemui.statusbar.phone.ObservableScrollView> 
进行加载.

2.0 下面我们来对相关的各个模块一一进行剖析 
2.0.1 下面我们先来分析 android:id=”@+id/brightness_slider” 
先上图： 
<img src="http://img.blog.csdn.net/20150717162106528" alt="这里写图片描述" title=""> 
我们全局搜索“brightness_slider”看看有什么收获 
1 33 frameworks/base/packages/SystemUI/res/layout/quick_settings_brightness_dialog.xml <<>> 
android:id=”@+id/brightness_slider” 
2 109 frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java <<>> 
(ToggleSlider) findViewById(R.id.brightness_slider)); 
3 126 frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java <<>> 
ToggleSlider brightnessSlider = (ToggleSlider) findViewById(R.id.brightness_slider); 
4 127 frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java <<>> 
ToggleSlider mirror = (ToggleSlider) c.getMirror().findViewById(R.id.brightness_slider); 
5 51 frameworks/base/packages/SystemUI/src/com/android/systemui/settings/BrightnessDialog.java <<>> 
final ToggleSlider slider = (ToggleSlider) findViewById(R.id.brightness_slider);

从这里我们看到，brightness_slider是在quick_settings_brightness_dialog.xml里添加的id，那么我们就在看看是哪里调用的quick_settings_brightness_dialog.xml文件， 
1 99 frameworks/base/packages/SystemUI/src/com/android/systemui/qs/QSPanel.java <> 
R.layout.quick_settings_brightness_dialog, this, false); 
2 48 frameworks/base/packages/SystemUI/src/com/android/systemui/settings/BrightnessDialog.java <> 
setContentView(R.layout.quick_settings_brightness_dialog); 
原来是在QSPanel.java中调用的xml， 
mBrightnessView = LayoutInflater.from(context).inflate(R.layout.quick_settings_brightness_dialog, this, false); 
为了更直观的看到这个调用顺序，我们在 
public QSPanel(Context context, AttributeSet attrs) 
中把调用堆栈给打印出来看看： 
0java.lang.Throwable 
at com.android.systemui.qs.QSPanel.(QSPanel.java:89) 
at java.lang.reflect.Constructor.newInstance(Native Method) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:288) 
at android.view.LayoutInflater.createView(LayoutInflater.java:607) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:916) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:802) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:916) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:802) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:504) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
at android.view.View.inflate(View.java:18547) 
at com.android.systemui.statusbar.phone.PhoneStatusBar.makeStatusBarView(PhoneStatusBar.java:648) 
at com.android.systemui.statusbar.phone.PhoneStatusBar.addStatusBarWindow(PhoneStatusBar.java:3087) 
at com.android.systemui.statusbar.phone.PhoneStatusBar.createAndAddWindows(PhoneStatusBar.java:3083) 
at com.android.systemui.statusbar.BaseStatusBar.start(BaseStatusBar.java:564) 
at com.android.systemui.statusbar.phone.PhoneStatusBar.start(PhoneStatusBar.java:598) 
at com.android.systemui.statusbar.SystemBars.createStatusBarFromConfig(SystemBars.java:107) 
at com.android.systemui.statusbar.SystemBars.onNoService(SystemBars.java:59) 
at com.android.systemui.statusbar.ServiceMonitor.startService(ServiceMonitor.java:228) 
at com.android.systemui.statusbar.ServiceMonitor.access000(ServiceMonitor.java:49)atcom.android.systemui.statusbar.ServiceMonitor<script type="math/tex" id="MathJax-Element-12">000(ServiceMonitor.java:49)
at com.android.systemui.statusbar.ServiceMonitor</script>1.handleMessage(ServiceMonitor.java:73) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5345) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:947) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:742)

从上面的调用中我们可以看到， 
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java 
的protected PhoneStatusBarView makeStatusBarView(){}; 
mStatusBarWindow = (StatusBarWindowView) View.inflate(context,R.layout.super_status_bar, null); 
这个语句中动态加载的。

2.1 设置header视图中的位置信息: updateHeaderShade()

<pre class="prettyprint" name="code"><code class="hljs avrasm has-numbering">at com.android.systemui.statusbar.phone.NotificationPanelView.**updateHeaderShade**(NotificationPanelView.java:1510)
at com.android.systemui.statusbar.phone.NotificationPanelView.updateHeader(NotificationPanelView.java:1502)
at com.android.systemui.statusbar.phone.NotificationPanelView.onHeightUpdated(NotificationPanelView.java:1379)
at com.android.systemui.statusbar.phone.PanelView.setExpandedHeightInternal(PanelView.java:660)
at com.android.systemui.statusbar.phone.PanelView.onTouchEvent(PanelView.java:315)
at com.android.systemui.statusbar.phone.NotificationPanelView.onTouchEvent(NotificationPanelView.java:707)
at com.android.systemui.statusbar.phone.PanelBar.onTouchEvent(PanelBar.java:131)
at com.android.systemui.statusbar.phone.PhoneStatusBarView.onTouchEvent(PhoneStatusBarView.java:158)
at android.view.View.**dispatchTouchEvent**(View.java:8481)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2432)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2103)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2438)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2132)
at com.android.systemui.statusbar.phone.StatusBarWindowView.dispatchTouchEvent(StatusBarWindowView.java:165)
at android.view.View.dispatchPointerEvent(View.java:8681)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5817)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5791)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5762)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5907)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5878)
at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5930)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:548)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5345)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:947)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:742)</code><ul class="pre-numbering" style="opacity: 0;"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li></ul><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div><ul class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li></ul></pre>

我们看到，每当有点击事件的时候，都会去更新header的y轴的数据信息，从负值一直到零，注意这里最大的值是零。

总结，以上是对SystemUi的一些简单分析，在这里对启动的流程，各个文件的布局进行了一些简单的分析，这里面有许多细节的东西没有去进行更进一步的剖析，后面有时间会讲这些细节的东西补上。</div>
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<div id="comment_list"><dl class="comment_item comment_topic" id="comment_item_5891431"><dt class="comment_head" floor="4">4楼 <a class="username" href="/qq_27604559" target="_blank">qq_27604559</a> 2016-02-23 16:08发表 <a href="#reply" class="cmt_btn reply" title="回复">[回复]</a> <a href="#quote" class="cmt_btn quote" title="引用">[引用]</a> <a href="#report" class="cmt_btn report" title="举报">[举报]</a></dt><dd class="comment_userface"><a href="/qq_27604559" target="_blank"><img src="http://avatar.csdn.net/1/7/9/3_qq_27604559.jpg" width="40" height="40"></a></dd><dd class="comment_body">写的很好，最近在做ROM涉及到这部分东西，多谢分享</dd></dl><dl class="comment_item comment_topic" id="comment_item_5834631"><dt class="comment_head" floor="3">3楼 <a class="username" href="/hymgoodluck" target="_blank">hymgoodluck</a> 2016-01-07 23:33发表 <a href="#reply" class="cmt_btn reply" title="回复">[回复]</a> <a href="#quote" class="cmt_btn quote" title="引用">[引用]</a> <a href="#report" class="cmt_btn report" title="举报">[举报]</a></dt><dd class="comment_userface"><a href="/hymgoodluck" target="_blank"><img src="http://avatar.csdn.net/F/B/C/3_hymgoodluck.jpg" width="40" height="40"></a></dd><dd class="comment_body">很好，学习了</dd></dl><dl class="comment_item comment_topic" id="comment_item_5697507"><dt class="comment_head" floor="2">2楼 <a class="username" href="/qijian0503" target="_blank">我是树的种子</a> 2015-12-05 13:44发表 <a href="#reply" class="cmt_btn reply" title="回复">[回复]</a> <a href="#quote" class="cmt_btn quote" title="引用">[引用]</a> <a href="#report" class="cmt_btn report" title="举报">[举报]</a></dt><dd class="comment_userface"><a href="/qijian0503" target="_blank"><img src="http://avatar.csdn.net/9/6/3/3_qijian0503.jpg" width="40" height="40"></a></dd><dd class="comment_body">写的很好，非常感谢！</dd></dl><dl class="comment_item comment_topic" id="comment_item_5210145"><dt class="comment_head" floor="1">1楼 <a class="username" href="/lz99770337" target="_blank">lz99770337</a> 2015-07-18 10:51发表 <a href="#reply" class="cmt_btn reply" title="回复">[回复]</a> <a href="#quote" class="cmt_btn quote" title="引用">[引用]</a> <a href="#report" class="cmt_btn report" title="举报">[举报]</a></dt><dd class="comment_userface"><a href="/lz99770337" target="_blank"><img src="http://avatar.csdn.net/E/C/6/3_lz99770337.jpg" width="40" height="40"></a></dd><dd class="comment_body">还有些细节的东西没有去详写，后面抽空完善。</dd></dl><div class="clear"></div></div>
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