Android 11根据包名查找是否安装第三方应用

Android 11 中的软件包可见性

关于Android 11 中权限的变更请阅读谷歌官方的两篇文章: package-visibility和查询特定软件包

比如要查询是否安装国内一些常见 App，在AndroidManifest.xml中添加如下内容

<manifest package="com.example.game">
    <queries>

        <intent>
            <action android:name="android.intent.action.DIAL" />
        </intent>

        <!-- 微信支付SDK -->
        <package android:name="com.tencent.mm" />
        <!-- 支付宝支付SDK -->
        <package android:name="com.eg.android.AlipayGphone" />
        <!-- 微博 -->
        <package android:name="com.sina.weibo" />
        <!-- QQ -->
        <package android:name="com.tencent.mobileqq" />
        <!-- 高德地图 -->
        <package android:name="com.autonavi.minimap" />
        <!-- 百度地图 -->
        <package android:name="com.baidu.BaiduMap" />
        <!-- 腾讯地图 -->
        <package android:name="com.tencent.map" />
    </queries>
    <!--Other Content-->
</manifest>

.NET 代码

public static class PlatformUtils
{
    public const string WeChatPackage = "com.tencent.mm";

    public static bool IsInstallApp(Context context, string packageName)
    {
        //IList<PackageInfo> packages = context.PackageManager.GetInstalledPackages(0);
        var packages = GetPackageList(context);
        return packages.Count(x => x.PackageName == packageName) > 0;
    }

    public static IEnumerable<PackageInfo> GetPackageList(Context context)
    {
        try
        {
            if (context.PackageManager != null)
            {
                var packageInfos = context.PackageManager.GetInstalledPackages(PackageInfoFlags.Activities |
                    PackageInfoFlags.Services);
                return packageInfos.ToList();
            }
        }
        catch (Java.Lang.Exception e)
        {
            e.PrintStackTrace();
        }
        return new List<PackageInfo>();
    }

    public static List<string> GetPackageNameList()
    {
        List<string> packages = new();
        try
        {
            var p = Runtime.GetRuntime()?.Exec("pm list packages");
            if (p != null)
            {
                InputStreamReader isr = new(p.InputStream, "utf-8");
                BufferedReader br = new(isr);
                var line = br.ReadLine();
                while (line != null)
                {
                    line = line.Trim();
                    if (line.Length > 8)
                    {
                        var prefix = line.Substring(0, 8);
                        if (prefix.Equals("package:", StringComparison.OrdinalIgnoreCase))
                        {
                            line = line[8..].Trim();
                            if (!TextUtils.IsEmpty(line))
                            {
                                packages.Add(line);
                            }
                        }
                    }
                    line = br.ReadLine();
                }
                br.Close();
            }

            p?.Destroy();
        }
        catch (Java.Lang.Exception e)
        {
            e.PrintStackTrace();
        }
        return packages;
    }
}