launcher homeSettings notificationDots

背景描述

Android12，修改源码中launcher包名后，需要修改很多默认配置。其它模块调用launcher包名修改，framework默认配置修改，gms下面overlay修改等等。
本问简单记录一下桌面设置中“通知圆点”。在修改包名之后变成三角形，没有默认open的问题。

问题跟踪

1、问题原因
因为界面在launcher中，现在launcher中找到菜单的显示逻辑，看看是根据什么判断的状态。
packages\apps\Launcher3\src\com\android\launcher3\settings\NotificationDotsPreference.java

private static final String NOTIFICATION_ENABLED_LISTENERS = "enabled_notification_listeners";
    @Override
    public void onSettingsChanged(boolean enabled) {
        int summary = enabled
                ? R.string.notification_dots_desc_on
                : R.string.notification_dots_desc_off;

        boolean serviceEnabled = true;
        if (enabled) {
            // Check if the listener is enabled or not.
            //获取setting数据库中的值
            String enabledListeners = Settings.Secure.getString(
                    getContext().getContentResolver(), NOTIFICATION_ENABLED_LISTENERS);
            //当前类包类名
            ComponentName myListener =
                    new ComponentName(getContext(), NotificationListener.class);
            //判断是否打开
            serviceEnabled = enabledListeners != null &&
                    (enabledListeners.contains(myListener.flattenToString()) ||
                            enabledListeners.contains(myListener.flattenToShortString()));
            if (!serviceEnabled) {
                summary = R.string.title_missing_notification_access;
            }
        }
        setWidgetFrameVisible(!serviceEnabled);
        setFragment(serviceEnabled ? null : NotificationAccessConfirmation.class.getName());
        setSummary(summary);
        NotifyDotNumWrapper.setNotifyDotsExtPrefEnabled(getContext(), enabled && !mWidgetFrameVisible);
    }
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以上可以看出，其实关键在于Settings.Secure.getString(getContext().getContentResolver(), NOTIFICATION_ENABLED_LISTENERS);这个值。
正常情况下adb打印如下：

adb shell settings get secure enabled_notification_listeners
com.google.android.projection.gearhead/com.google.android.gearhead.notifications.SharedNotificationListenerManager$ListenerService:com.android.launcher3/com.android.launcher3.notification.NotificationListener
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修改包名之后，这个值没有launcher的NotificationListener了。所以launcher桌面设置中显示三角形。
2、NOTIFICATION_ENABLED_LISTENERS
NOTIFICATION_ENABLED_LISTENERS = “enabled_notification_listeners”
那么现在的问题就是这个值是哪里设置进去的。
弯路1：
一开始以为是在setting或者settingprovider里，后来发现这两个代码里没有相关的东西。
弯路2：
在framework中搜索enabled_notification_listeners，发现直接调用enabled_notification_listeners的地方，没有调用Settings.Secure.putStringForUser()方法。那么可能是间接调用然后本地临时变量存了key值，再去put。这样就不容易找到默认值是哪里写入的了。
解套
1、frameworks\base\core\java\android\provider\Settings.java

直接找到putStringForUser方法，添加调用堆栈打印：
if("enabled_notification_listeners".equals(name)){
	Log.i(TAG,  "putStringForUser"+Log.getStackTraceString(new Throwable()));
}
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2022-11-23 23:19:28.003 1125-1255/system_process I/Settings: putStringForUserjava.lang.Throwable
        at android.provider.Settings$Secure.putStringForUser(Settings.java:5900)
        at android.provider.Settings$Secure.putStringForUser(Settings.java:5890)
        at com.android.server.notification.ManagedServices.writeXml(ManagedServices.java:536)
        at com.android.server.notification.NotificationManagerService.writePolicyXml(NotificationManagerService.java:1100)
        at com.android.server.notification.NotificationManagerService.access$200(NotificationManagerService.java:338)
        at com.android.server.notification.NotificationManagerService$SavePolicyFileRunnable.run(NotificationManagerService.java:1075)
        at android.os.Handler.handleCallback(Handler.java:938)
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2、由此跟踪到frameworks\base\services\core\java\com\android\server\notification\ManagedServices.java
写值的方法都在这个类里

writeXml方法去调用的put值
//它里面所有put的值来源mApproved
protected ArrayMap<Integer, ArrayMap<Boolean, ArraySet<String>>> mApproved = new ArrayMap<>();
//查一查mApproved值的来源
//整个类只有2个地方调用mApproved.put
//添加堆栈打印，再次编译后得到调用堆栈如下
//setPackageOrComponentEnabled方法
  addDefaultComponentOrPackage: java.lang.Throwable
 	at com.android.server.notification.ManagedServices.addDefaultComponentOrPackage(ManagedServices.java:219)
 	at com.android.server.notification.NotificationManagerService$NotificationListeners.loadDefaultsFromConfig(NotificationManagerService.java:10247)
 	at com.android.server.notification.NotificationManagerService.loadDefaultApprovedServices(NotificationManagerService.java:748)
 	at com.android.server.notification.NotificationManagerService.loadPolicyFile(NotificationManagerService.java:1040)
 	at com.android.server.notification.NotificationManagerService.init(NotificationManagerService.java:2384)
 	at com.android.server.notification.NotificationManagerService.onStart(NotificationManagerService.java:2554)
 	at com.android.server.SystemServiceManager.startService(SystemServiceManager.java:205)
 	at com.android.server.SystemServiceManager.startService(SystemServiceManager.java:192)
 	at com.android.server.SystemServer.startOtherServices(SystemServer.java:2064)
 	at com.android.server.SystemServer.run(SystemServer.java:933)
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由此可见，系统启动流程中启动了service，service的init调用了加载默认配置。
3、跟踪上面流程中，加载默认配置的值是配在哪里
frameworks\base\services\core\java\com\android\server\notification\NotificationManagerService.java
内部类public class NotificationListeners extends ManagedServices

        @Override
        protected void loadDefaultsFromConfig() {
            String defaultListenerAccess = mContext.getResources().getString(
                    R.string.config_defaultListenerAccessPackages);
            Log.v(TAG, " loadDefaultsFromConfig defaultListenerAccess: "+defaultListenerAccess);
            if (defaultListenerAccess != null) {
                String[] listeners =
                        defaultListenerAccess.split(ManagedServices.ENABLED_SERVICES_SEPARATOR);
                for (int i = 0; i < listeners.length; i++) {
                    if (TextUtils.isEmpty(listeners[i])) {
                        continue;
                    }
                    ArraySet<ComponentName> approvedListeners =
                            this.queryPackageForServices(listeners[i],
                                    MATCH_DIRECT_BOOT_AWARE
                                            | MATCH_DIRECT_BOOT_UNAWARE, USER_SYSTEM);

                    for (int k = 0; k < approvedListeners.size(); k++) {
                        ComponentName cn = approvedListeners.valueAt(k);
                        Log.v(TAG, " loadDefaultsFromConfig cn: "+cn);
                        addDefaultComponentOrPackage(cn.flattenToString());
                    }
                }
            }
        }
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最终定位到config_defaultListenerAccessPackages配置。
vendor\partner_gms\overlay\GmsConfigOverlayCommon\res\values\config.xml

<string name="config_defaultListenerAccessPackages" translatable="false">com.tblenovo.launcher:com.google.android.projection.gearhead</string>
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流程

1、SystemServer.startOtherServices
NotificationManagerService.init
NotificationManagerService.loadPolicyFile

    protected void loadPolicyFile() {
        if (DBG) Slog.d(TAG, "loadPolicyFile");
        if(mPolicyFile != null ){
            if (mPolicyFile.getBaseFile() != null){
                Slog.d(TAG, "loadPolicyFile: "+mPolicyFile.getBaseFile().getAbsolutePath());
            }
        }
        synchronized (mPolicyFile) {
            InputStream infile = null;
            try {
                infile = mPolicyFile.openRead();
                readPolicyXml(infile, false /*forRestore*/, UserHandle.USER_ALL);
            } catch (FileNotFoundException e) {
                // No data yet
                // Load default managed services approvals
                loadDefaultApprovedServices(USER_SYSTEM);//加载默认配置
                allowDefaultApprovedServices(USER_SYSTEM);//默认配置bind并缓存
            } catch (IOException e) {
                Log.wtf(TAG, "Unable to read notification policy", e);
            } catch (NumberFormatException e) {
                Log.wtf(TAG, "Unable to parse notification policy", e);
            } catch (XmlPullParserException e) {
                Log.wtf(TAG, "Unable to parse notification policy", e);
            } finally {
                IoUtils.closeQuietly(infile);
            }
        }
    }
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//文件不存在时加载默认值，文件存在时加载文件。文件路径如下
final File systemDir = new File(Environment.getDataDirectory(), "system");
new File(systemDir, "notification_policy.xml"), "notification-policy"),
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