在Android上向现有设备管理员添加新的使用策略

问题描述

我有一个使用以下device-admin.xml的设备管理应用程序

I have a device admin app that uses the following device-admin.xml

<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
 <uses-policies>
     <watch-login />
     <reset-password />
     <force-lock />
     <wipe-data />
 </uses-policies>
</device-admin>

某些用户已经激活了设备管理员权限.现在，在该应用程序的更新中，我想添加一个新的uses-policy

Some users has already activated the device admin permissions. Now, in an update of the app, I want to add a new uses-policy

 <limit-password />

我想知道如何检测是否已通过编程方式添加了新的使用策略，以便我们推动重新激活设备管理员权限?

I am wondering how to detect that new use policies have been added programmatically so that we push the reactivation of the device admin permissions?

推荐答案

AFAIK的唯一方法是从apk中读取device-admin.xml，您可以通过以下方式(从活动中)进行操作:

AFAIK the only way is read your device-admin.xml from your apk, and you can do it in this way (from an Activity):

    PackageManager packageManager = getPackageManager();
    List <PackageInfo> packageInfoList = packageManager.getInstalledPackages(0);
    for (PackageInfo packageInfo : packageInfoList) {
        String publicSourceDir = packageInfo.applicationInfo.publicSourceDir;
        if (publicSourceDir.contains("your/app/path")) { // or equals, which you prefer
            File apkFile = new File(publicSourceDir);
            if (apkFile.exists()) {
                try {
                    JarFile jarFile = new JarFile(apkFile);
                    JarEntry jarEntry = jarFile.getJarEntry("xml/device-admin.xml");
                    InputStream is = jarFile.getInputStream(jarEntry);
                    BufferedReader br = new BufferedReader(new InputStreamReader(is));
                    String str;
                    while ((str = br.readLine()) != null) {
                        Log.d("entry: ", str); // your entries in the device-admin.xml
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            break;
        }
    }

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