问题背景

测试反馈，无障碍快捷方式和setting里的无障碍图标不一致。

无障碍快捷方式悬浮窗

1、悬浮窗在systemui中
frameworks\base\packages\SystemUI\src\com\android\systemui\accessibility\floatingmenu\AccessibilityTargetAdapter.java
图标获取方式：

final AccessibilityTarget target = mTargets.get(position);
holder.mIconView.setBackground(target.getIcon());

frameworks\base\packages\SystemUI\src\com\android\systemui\accessibility\floatingmenu\MenuInfoRepository.java

void loadMenuTargetFeatures(OnInfoReady<List<AccessibilityTarget>> callback) {callback.onReady(getTargets(mContext, ACCESSIBILITY_BUTTON));
}

2、数据来源
frameworks\base\core\java\com\android\internal\accessibility\dialog\AccessibilityTargetHelper.java

public static List<AccessibilityTarget> getTargets(Context context,@ShortcutType int shortcutType)

AccessibilityTarget Icon数据来自
frameworks\base\core\java\com\android\internal\accessibility\dialog\AccessibilityServiceTarget.java

AccessibilityServiceTarget(Context context, @ShortcutType int shortcutType,@AccessibilityFragmentType int fragmentType,@NonNull AccessibilityServiceInfo serviceInfo) {super(context,shortcutType,fragmentType,isShortcutContained(context, shortcutType,serviceInfo.getComponentName().flattenToString()),serviceInfo.getComponentName().flattenToString(),serviceInfo.getResolveInfo().serviceInfo.applicationInfo.uid,serviceInfo.getResolveInfo().loadLabel(context.getPackageManager()),serviceInfo.getResolveInfo().loadIcon(context.getPackageManager()),convertToKey(convertToUserType(shortcutType)));
}

由此可见，systemui里直接显示的支持无障碍Service/activity的原图。

setting中的无障碍菜单

Settings\src\com\android\settings\accessibility\RestrictedPreferenceHelper.java

public List<RestrictedPreference> createAccessibilityServicePreferenceList(List<AccessibilityServiceInfo> installedServices) {Drawable icon = resolveInfo.loadIcon(mPm);
}

setting里获取方式和systemUI一样。都是通过service的resolveInfo.loadIcon(mPm);

区别：
setting里把Drawable转换成了AdaptiveIcon，再传给了preference。所以显示圆角。

private RestrictedPreference createRestrictedPreference(){preference.setIcon(Utils.getAdaptiveIcon(mContext, icon, Color.WHITE));
}

创建demo显示在无障碍

是通过android.accessibilityservice.AccessibilityService注册然后系统自动加载进去的。
AndroidManifest.xml

        <serviceandroid:name=".MyAccessibilityService"android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE"android:enabled="true"android:exported="false"><intent-filter><actionandroid:name="android.accessibilityservice.AccessibilityService" /></intent-filter><meta-dataandroid:name="android.accessibilityservice"android:resource="@xml/accessibility_service_config" /></service>

res/xml/accessibility_service_config.xml

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"android:description="@string/setting_accessibility_tip"android:accessibilityEventTypes="typeWindowStateChanged"android:packageNames="com.whatsapp"android:accessibilityFeedbackType="feedbackGeneric"android:notificationTimeout="100"android:accessibilityFlags="flagDefault"android:canRetrieveWindowContent="true"/>