已获取Device admin权限，能否禁用应用的卸载选项？

Awesome question! Since you already hold Device Admin privileges, you’re totally able to lock down the uninstall option for your app (the grayed-out button in Settings → Apps → App Info) and fire off your API when a user tries to uninstall it. Here’s a step-by-step breakdown of how to make this work:

1. Use Device Admin’s Built-in Uninstall Block #

First off, when your app is registered as a Device Admin, the system will automatically gray out the "Uninstall" button in App Info by default. Users can only uninstall after removing your app’s admin status — and that’s exactly where we’ll hook in our API call.

2. Hook Into the Admin Disable Request #

You’ll need to extend the DeviceAdminReceiver class and override the onDisableRequested() method. This method gets called the second a user tries to revoke your app’s admin rights (the first step to uninstalling). Here’s a concrete code example (Kotlin, adaptable to Java):

class MyDeviceAdminReceiver : DeviceAdminReceiver() {

    override fun onDisableRequested(context: Context, intent: Intent): CharSequence? {
        // Fire your API call here — triggers when user tries to disable admin (uninstall prerequisite)
        logUninstallAttemptToAPI()
        
        // Return a message to show users explaining why uninstall is blocked
        return "This app can't be uninstalled directly. Please reach out to your admin for assistance."
    }

    private fun logUninstallAttemptToAPI() {
        // Add your actual API call logic here (use Retrofit, Volley, coroutines, etc.)
        // Example with coroutines:
        // CoroutineScope(Dispatchers.IO).launch {
        //     try {
        //         val apiService = RetrofitClient.getApiService()
        //         apiService.logUninstallAttempt()
        //     } catch (e: Exception) {
        //         // Handle API call failure (log it, retry later, etc.)
        //     }
        // }
    }
}

3. Set Up Manifest & Device Admin Policies Correctly #

Don’t forget to declare your receiver in the AndroidManifest.xml and enable the right policies to block uninstalls:

Manifest Declaration #

<receiver
    android:name=".MyDeviceAdminReceiver"
    android:permission="android.permission.BIND_DEVICE_ADMIN">
    <meta-data
        android:name="android.app.device_admin"
        android:resource="@xml/device_admin_policy" />
    <intent-filter>
        <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
    </intent-filter>
</receiver>

Device Admin Policy XML (res/xml/device_admin_policy.xml) #

Include the disable-uninstall-packages policy to formally block uninstalls:

<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-policies>
        <disable-uninstall-packages />
        <!-- Add any other device admin policies your app needs here -->
    </uses-policies>
</device-admin>

4. Quick Tips to Avoid Headaches #

• Async API Calls: Always run your API call in a background thread (coroutines, AsyncTask, etc.) — never block the UI while the request processes.
• User Clarity: The message returned from onDisableRequested() pops up in a system dialog, so make it clear and helpful for users.
• Test Thoroughly: Walk through the flow yourself: try to uninstall via App Info, confirm the dialog appears, and verify your API gets triggered correctly.

内容的提问来源于stack exchange，提问作者Dinesh B