如何检查已安装的应用程序 android

Question

嘿，谁能向我解释一下这个 if 条件，顺便说一句，代码可以工作，但我不明白 if 条件

    PackageManager pm = context.getPackageManager();
    List<ApplicationInfo> apps = pm.getInstalledApplications(0);

    for(ApplicationInfo app : apps) {
        if((app.flags & (ApplicationInfo.FLAG_UPDATED_SYSTEM_APP | ApplicationInfo.FLAG_SYSTEM)) > 0) {
  

            // It is a system app
        } else {
            // It is installed by the user
        }
    }

Answer 1

获取Android已安装应用列表，使用代码如下：

Intent intent = new Intent(Intent.ACTION_MAIN, null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> appsList = context.getPackageManager().queryIntentActivities(intent, 0);