StatusBar源码解读

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字数统计: 1,970字 | 阅读时长 ≈ 12分钟

背景

​ 状态栏属于SystemUI的管理范畴,虽然app界面的UI会受到SystemUI的影响，但是app并没有权限去直接绘制SystemUI的权限.所以还是需要通过更改一些SystemUI暴露出来的方法进行属性的修改,然后最终操纵的还是自己的View,来达到预期的效果

结构

StatusBarWindowView.java

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<!-- StatusBar的最外层-->

<com.android.systemui.statusbar.phone.StatusBarWindowView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"
    android:focusable="true"
    android:descendantFocusability="afterDescendants"
    android:fitsSystemWindows="true"
    android:background="@android:color/transparent"
    >
<!--状态栏通常的显示状态-->
    <include layout="@layout/status_bar"
        android:layout_width="match_parent"
        android:layout_height="@*android:dimen/status_bar_height"
        />

 <!--状态栏下拉展开状态-->
    <com.android.systemui.statusbar.phone.PanelHolder
        android:id="@+id/panel_holder"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
        <include layout="@layout/status_bar_expanded"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            />
        <ViewStub android:id="@+id/quick_settings_stub"
            android:layout="@layout/quick_settings"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            />
    </com.android.systemui.statusbar.phone.PanelHolder>

</com.android.systemui.statusbar.phone.StatusBarWindowView>

PhoneStatusBarView.java

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<!--对应@layout/status_bar,是StatusBar的核心功能展示部分-->
  
<com.android.systemui.statusbar.phone.PhoneStatusBarView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"
    android:id="@+id/status_bar"
    android:background="@drawable/system_bar_background"
    android:orientation="vertical"
    android:focusable="true"
    android:descendantFocusability="afterDescendants"
    android:fitsSystemWindows="true"
    >

    <ImageView
        android:id="@+id/notification_lights_out"
        android:layout_width="@dimen/status_bar_icon_size"
        android:layout_height="match_parent"
        android:paddingStart="6dip"
        android:paddingBottom="2dip"
        android:src="@drawable/ic_sysbar_lights_out_dot_small"
        android:scaleType="center"
        android:visibility="gone"
        />

    <!-- 通常StatusBar的显示样式-->
    <LinearLayout android:id="@+id/status_bar_contents"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingStart="6dip"
        android:paddingEnd="6dip"
        android:orientation="horizontal"
        >

        <LinearLayout
            android:id="@+id/notification_icon_area"
            android:layout_width="0dip"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal"
            >
            <com.android.systemui.statusbar.StatusBarIconView android:id="@+id/moreIcon"
                android:layout_width="@dimen/status_bar_icon_size"
                android:layout_height="match_parent"
                android:src="@drawable/stat_notify_more"
                android:visibility="gone"
                />

            <com.android.systemui.statusbar.phone.IconMerger android:id="@+id/notificationIcons"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_alignParentStart="true"
                android:gravity="center_vertical"
                android:orientation="horizontal"/>  
        </LinearLayout>

        <LinearLayout android:id="@+id/system_icon_area"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="horizontal">

            <LinearLayout android:id="@+id/statusIcons"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:gravity="center_vertical"
                android:orientation="horizontal"/>    
    
            <LinearLayout
                android:id="@+id/signal_battery_cluster"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:paddingStart="2dp"
                android:orientation="horizontal"
                android:gravity="center"
                >
                <include layout="@layout/signal_cluster_view" 
                    android:id="@+id/signal_cluster"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    />
                <!-- battery must be padded below to match assets -->
                <com.android.systemui.BatteryMeterView
                    android:id="@+id/battery"
                    android:layout_height="16dp"
                    android:layout_width="10.5dp"
                    android:layout_marginBottom="0.33dp"
                    android:layout_marginStart="4dip"
                    />
            </LinearLayout>
    
            <com.android.systemui.statusbar.policy.Clock
                android:id="@+id/clock"
                android:textAppearance="@style/TextAppearance.StatusBar.Clock"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:singleLine="true"
                android:paddingStart="6dip"
                android:gravity="center_vertical|start"
                />
        </LinearLayout>
    </LinearLayout>
        
    <!--当有notification到达的时候显示的样式-->
    <LinearLayout android:id="@+id/ticker"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingStart="6dip"
        android:animationCache="false"
        android:orientation="horizontal" >
        <ImageSwitcher android:id="@+id/tickerIcon"
            android:layout_width="@dimen/status_bar_icon_size"
            android:layout_height="@dimen/status_bar_icon_size"
            android:layout_marginEnd="4dip"
            >
            <com.android.systemui.statusbar.AnimatedImageView
                android:layout_width="@dimen/status_bar_icon_size"
                android:layout_height="@dimen/status_bar_icon_size"
                android:scaleType="center"
                />
            <com.android.systemui.statusbar.AnimatedImageView
                android:layout_width="@dimen/status_bar_icon_size"
                android:layout_height="@dimen/status_bar_icon_size"
                android:scaleType="center"
                />
        </ImageSwitcher>
        <com.android.systemui.statusbar.phone.TickerView android:id="@+id/tickerText"
            android:layout_width="0dip"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:paddingTop="2dip"
            android:paddingEnd="10dip">
            <TextView
                android:textAppearance="@style/TextAppearance.StatusBar.PhoneTicker"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:singleLine="true"
                />
            <TextView
                android:textAppearance="@style/TextAppearance.StatusBar.PhoneTicker"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:singleLine="true"
                />
        </com.android.systemui.statusbar.phone.TickerView>
    </LinearLayout>
</com.android.systemui.statusbar.phone.PhoneStatusBarView>

PhoneStatusBar

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//as a View Controller
public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
        DragDownHelper.DragDownCallback, ActivityStarter, OnUnlockMethodChangedListener,
        HeadsUpManager.OnHeadsUpChangedListener {
        //......
        }

沉浸式属性

android:windowTranslucentStatus

  • 目的:设置SystemUI中的statusBar的背景色为透明
  • ApiLevel: Android 4.4/ApiLevel 19

android:windowTranslucentNavigation

  • 目的:设置SystemUI中的Navigation背景为透明
  • ApiLevel:Android 4.4/ApiLevel 19

android:statusBarColor

  • 目的:暴露接口设置statueBar的颜色
  • ApiLevel:Android 5.x/ApiLevel 21

android:fitsSystemWindows=”true”

  • 目的:和systemUI和谐共处,所以不会占用systemUI空间,用上下左右的padding值进行填充,以保持和SystemUi和谐共处.

android:clipToPadding=”true”

  • 目的:和padding值交集的部分是否采用clip的显示方式

显示流程

时序图

通过Zygote启动SystemServer最终启动SystemUIServer

StatusBar_Init

相关代码

BaseStatusBar.start()

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/**
 * 1.register systerm bar manager service
 * 2.createAndAddWindows() install views/  PhoneStatusBar makeStatusBarView
 * 3.addIcon List
 * 4.register notifcation
 * 5.register broadcast
 *
 */
public void start() {
    mWindowManager = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
    mWindowManagerService = WindowManagerGlobal.getWindowManagerService();
    mDisplay = mWindowManager.getDefaultDisplay();
    mDevicePolicyManager = (DevicePolicyManager)mContext.getSystemService(
            Context.DEVICE_POLICY_SERVICE);
  //step 1
    mNotificationColorUtil = NotificationColorUtil.getInstance(mContext);

    mNotificationData = new NotificationData(this);

    mAccessibilityManager = (AccessibilityManager)
            mContext.getSystemService(Context.ACCESSIBILITY_SERVICE);

    mDreamManager = IDreamManager.Stub.asInterface(
            ServiceManager.checkService(DreamService.DREAM_SERVICE));
    mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);

    mContext.getContentResolver().registerContentObserver(
            Settings.Global.getUriFor(Settings.Global.DEVICE_PROVISIONED), true,
            mSettingsObserver);
    mContext.getContentResolver().registerContentObserver(
            Settings.Global.getUriFor(Settings.Global.ZEN_MODE), false,
            mSettingsObserver);
    mContext.getContentResolver().registerContentObserver(
            Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS), false,
            mSettingsObserver,
            UserHandle.USER_ALL);

    mContext.getContentResolver().registerContentObserver(
            Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS),
            true,
            mLockscreenSettingsObserver,
            UserHandle.USER_ALL);

    mBarService = IStatusBarService.Stub.asInterface(
            ServiceManager.getService(Context.STATUS_BAR_SERVICE));

    mRecents = getComponent(Recents.class);
    mRecents.setCallback(this);

    final Configuration currentConfig = mContext.getResources().getConfiguration();
    mLocale = currentConfig.locale;
    mLayoutDirection = TextUtils.getLayoutDirectionFromLocale(mLocale);
    mFontScale = currentConfig.fontScale;

    mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);

    mLinearOutSlowIn = AnimationUtils.loadInterpolator(mContext,
            android.R.interpolator.linear_out_slow_in);
    mFastOutLinearIn = AnimationUtils.loadInterpolator(mContext,
            android.R.interpolator.fast_out_linear_in);

    // Connect in to the status bar manager service
    StatusBarIconList iconList = new StatusBarIconList();
    mCommandQueue = new CommandQueue(this, iconList);

    int[] switches = new int[8];
    ArrayList<IBinder> binders = new ArrayList<IBinder>();
    try {
        mBarService.registerStatusBar(mCommandQueue, iconList, switches, binders);
    } catch (RemoteException ex) {
        // If the system process isn't there we're doomed anyway.
    }
  //step 2 
    createAndAddWindows();

    mSettingsObserver.onChange(false); // set up
    disable(switches[0], switches[6], false /* animate */);
    setSystemUiVisibility(switches[1], 0xffffffff);
    topAppWindowChanged(switches[2] != 0);
    // StatusBarManagerService has a back up of IME token and it's restored here.
    setImeWindowStatus(binders.get(0), switches[3], switches[4], switches[5] != 0);
  //step 3
    // Set up the initial icon state
    int N = iconList.size();
    int viewIndex = 0;
    for (int i=0; i<N; i++) {
        StatusBarIcon icon = iconList.getIcon(i);
        if (icon != null) {
            addIcon(iconList.getSlot(i), i, viewIndex, icon);
            viewIndex++;
        }
    }
  //step 4
    // Set up the initial notification state.
    try {
        mNotificationListener.registerAsSystemService(mContext,
                new ComponentName(mContext.getPackageName(), getClass().getCanonicalName()),
                UserHandle.USER_ALL);
    } catch (RemoteException e) {
        Log.e(TAG, "Unable to register notification listener", e);
    }


    if (DEBUG) {
        Log.d(TAG, String.format(
                "init: icons=%d disabled=0x%08x lights=0x%08x menu=0x%08x imeButton=0x%08x",
               iconList.size(),
               switches[0],
               switches[1],
               switches[2],
               switches[3]
               ));
    }

    mCurrentUserId = ActivityManager.getCurrentUser();
    setHeadsUpUser(mCurrentUserId);
   //step 5
    IntentFilter filter = new IntentFilter();
    filter.addAction(Intent.ACTION_USER_SWITCHED);
    filter.addAction(Intent.ACTION_USER_ADDED);
    filter.addAction(Intent.ACTION_USER_PRESENT);
    filter.addAction(BANNER_ACTION_CANCEL);
    filter.addAction(BANNER_ACTION_SETUP);
    mContext.registerReceiver(mBroadcastReceiver, filter);

    IntentFilter allUsersFilter = new IntentFilter();
    allUsersFilter.addAction(
            DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED);
    mContext.registerReceiverAsUser(mAllUsersReceiver, UserHandle.ALL, allUsersFilter,
            null, null);
    updateCurrentProfilesCache();
}

开源框架（SystemBarTint）

一个工具式的开源框架

initBar

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/**
1.make systemUI transparent
2.add View own at the same place and then you can control the performance of your own View
**/
public SystemBarTintManager(Activity activity) {

        Window win = activity.getWindow();
        ViewGroup decorViewGroup = (ViewGroup) win.getDecorView();

        //android 4.4
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            // check theme attrs
            int[] attrs = {android.R.attr.windowTranslucentStatus,
                    android.R.attr.windowTranslucentNavigation};
            TypedArray a = activity.obtainStyledAttributes(attrs);
            try {
                mStatusBarAvailable = a.getBoolean(0, false);
                mNavBarAvailable = a.getBoolean(1, false);
            } finally {
                a.recycle();
            }

            // check window flags
            WindowManager.LayoutParams winParams = win.getAttributes();
            int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
            if ((winParams.flags & bits) != 0) {
                mStatusBarAvailable = true;
            }
            bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
            if ((winParams.flags & bits) != 0) {
                mNavBarAvailable = true;
            }
        }

        mConfig = new SystemBarConfig(activity, mStatusBarAvailable, mNavBarAvailable);
        // device might not have virtual navigation keys
        if (!mConfig.hasNavigtionBar()) {
            mNavBarAvailable = false;
        }

        if (mStatusBarAvailable) {
            setupStatusBarView(activity, decorViewGroup);
        }
        if (mNavBarAvailable) {
            setupNavBarView(activity, decorViewGroup);
        }

    }

SystemBarConfig

Class which describes system bar sizing and other characteristics for the current device configuration

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public static class SystemBarConfig {
       //......

       private final boolean mTranslucentStatusBar;
       private final boolean mTranslucentNavBar;
       private final int mStatusBarHeight;
       private final int mActionBarHeight;
       private final boolean mHasNavigationBar;
       private final int mNavigationBarHeight;
       private final int mNavigationBarWidth;
       private final boolean mInPortrait;
       private final float mSmallestWidthDp;
       //......
       }

setupStatusBarView&&setStatusBarAlpha

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private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {
    mStatusBarTintView = new View(context);
    LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());
    params.gravity = Gravity.TOP;
    if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {
        params.rightMargin = mConfig.getNavigationBarWidth();
    }
    mStatusBarTintView.setLayoutParams(params);
    mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
    mStatusBarTintView.setVisibility(View.GONE);
    decorViewGroup.addView(mStatusBarTintView);
}
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/**
 * Apply the specified alpha to the system status bar.
 *
 * @param alpha The alpha to use
 */
@TargetApi(11)
public void setStatusBarAlpha(float alpha) {
    if (mStatusBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        mStatusBarTintView.setAlpha(alpha);
    }
}