如何用Java获取Cordova app同款Android设备UUID？

Let's break this down step by step. The this.device.uuid you're seeing in the Cordova app isn't the IMEI (which requires the restricted permissions you ran into) — it's almost certainly the Android ID from Settings.Secure.ANDROID_ID, and here's the full breakdown:

1. What Cordova's device.uuid Actually Returns #

The Cordova cordova-plugin-device (the plugin that powers device.uuid) uses this logic for Android devices:

• First, it fetches Settings.Secure.ANDROID_ID — a 64-bit hexadecimal string (16 characters long, exactly matching your example 29904bc142b60dce).
• This ID stays fixed for the same app (same signing key) on the same device/user profile. That aligns with your observation that the ID never changes.
• Crucially, accessing this ID requires no special permissions — no READ_PRIVILEGED_PHONE_STATE or even READ_PHONE_STATE is needed, which is why the Cordova app can get it without issues.

2. Native Java Code to Fetch the Same ID #

You can retrieve this identical ID with a simple, permission-free snippet:

import android.content.Context;
import android.provider.Settings;

public String getCordovaStyleDeviceUuid(Context context) {
    return Settings.Secure.getString(context.getContentResolver(), Settings.Secure.ANDROID_ID);
}

Key Notes: #

• On Android 8.0 (API level 26)+: ANDROID_ID is unique per app signature and user. If you change your app's signing key, the ID will update. For a single signed app on the same device/user, it remains stable.
• On pre-8.0 Android versions: ANDROID_ID was a device-wide value, but some older devices had bugs where it reset or returned a generic fixed string — this is rare in modern devices.

3. Why Your Original TelephonyManager Approach Failed #

The tManager.getDeviceId() method returns the device's IMEI (or MEID for CDMA devices), a hardware-specific identifier. Starting in Android 10 (API level 29), third-party apps can no longer access IMEIs directly — the READ_PRIVILEGED_PHONE_STATE permission is locked to system apps only. Cordova avoids this restriction entirely by using the Android ID instead.

内容的提问来源于stack exchange，提问作者Vishal Tiwari