如何检查是否启用了活动？

Question

背景

我正在尝试检查是否在运行时启用/禁用了活动(或任何其他应用程序组件类型).

问题

可以使用下一个代码:

    final ComponentName componentName = new ComponentName(context, activityClass);
    final PackageManager pm = context.getPackageManager();
    final int result = pm.getComponentEnabledSetting(componentName);

但是返回的结果,如文档中所写:

返回组件的当前启用状态.可以是COMPONENT_ENABLED_STATE_ENABLED,COM​​PONENT_ENABLED_STATE_DISABLED或COMPONENT_ENABLED_STATE_DEFAULT之一.最后一个意味着组件的启用状态基于清单中的原始信息,如ComponentInfo中所示.

所以它不仅是启用/禁用,还是"默认".

这个问题

如果返回"COMPONENT_ENABLED_STATE_DEFAULT",我如何知道它是默认为启用还是禁用(在运行时)？

这个问题的原因是无论人们放入清单中的内容("启用"属性),代码都应该有效.

是否有可能使用意图解决？

Answer 1

如果COMPONENT_ENABLED_STATE_DEFAULT返回,我怎么知道默认为启用还是禁用？

您需要使用PackageManager加载所有组件,并检查匹配的ComponentInfo的启用状态.以下代码应该有效:

public static boolean isComponentEnabled(PackageManager pm, String pkgName, String clsName) {
  ComponentName componentName = new ComponentName(pkgName, clsName);
  int componentEnabledSetting = pm.getComponentEnabledSetting(componentName);

  switch (componentEnabledSetting) {
    case PackageManager.COMPONENT_ENABLED_STATE_DISABLED:
      return false;
    case PackageManager.COMPONENT_ENABLED_STATE_ENABLED:
      return true;
    case PackageManager.COMPONENT_ENABLED_STATE_DEFAULT:
    default:
      // We need to get the application info to get the component's default state
      try {
        PackageInfo packageInfo = pm.getPackageInfo(pkgName, PackageManager.GET_ACTIVITIES
            | PackageManager.GET_RECEIVERS
            | PackageManager.GET_SERVICES
            | PackageManager.GET_PROVIDERS
            | PackageManager.GET_DISABLED_COMPONENTS);

        List<ComponentInfo> components = new ArrayList<>();
        if (packageInfo.activities != null) Collections.addAll(components, packageInfo.activities);
        if (packageInfo.services != null) Collections.addAll(components, packageInfo.services);
        if (packageInfo.providers != null) Collections.addAll(components, packageInfo.providers);

        for (ComponentInfo componentInfo : components) {
          if (componentInfo.name.equals(clsName)) {
            return componentInfo.isEnabled();
          }
        }

        // the component is not declared in the AndroidManifest
        return false;
      } catch (PackageManager.NameNotFoundException e) {
        // the package isn't installed on the device
        return false;
      }
  }
}

在我的设备上测试上面的代码:

System.out.println(isComponentEnabled(getPackageManager(),
    "com.android.systemui",
    "com.android.systemui.DessertCaseDream"));

System.out.println(isComponentEnabled(getPackageManager(),
    "com.android.settings",
    "com.android.settings.DevelopmentSettings"));

假

真正