Android中labelRes为0引发资源未找到异常，求原因分析

Got it, let's figure out why your labelRes is coming back as 0—this is exactly why you're seeing those frustrating resource not found errors:

W/ResourceType: No package identifier when getting value for resource number 0x00000000
android.content.res.Resources$NotFoundException: String resource ID #0x0

Here are the most common reasons this happens:

• You used a raw string instead of a resource reference for android:label
  If your AndroidManifest.xml has something like <application android:label="My Cool App">, the system can’t map this direct text to a valid resource ID. So it sets labelRes to 0 by default. Always use a resource reference like <application android:label="@string/app_name">—this tells the system to point to a defined string resource, which will give you a non-zero ID.

• The Context you’re using isn’t your app’s own Context
  If you’re grabbing a Context from a third-party library, a system component, or even another app’s Service, that Context might be tied to an application (or component) that doesn’t have a properly set label. Make sure you’re using your app’s application Context (via getApplicationContext()) or an Activity Context from your own app when calling context.getApplicationInfo().

• Your app’s Manifest has no android:label attribute
  If you completely left out the android:label tag from your <application> element, the system has no label resource to reference, so labelRes defaults to 0. Even if you think it’s optional, setting this via a resource is mandatory to get a valid resource ID here.

• Resource obfuscation or build cache corruption
  Tools like R8 or ProGuard might accidentally strip the app label resource if your obfuscation rules are too strict. Double-check your rules to ensure string resources like app_name are preserved. Also, a messed-up build cache can cause resource IDs to resolve incorrectly—try running ./gradlew clean (for Gradle projects) and rebuilding your app to fix this.

Quick Fix Steps: #

1. Open your AndroidManifest.xml and confirm android:label uses a resource reference (not a raw string).
2. Verify you’re using the correct Context (preferably your app’s application Context).
3. Check your obfuscation rules to protect your app’s string resources.
4. Clean and rebuild your project to clear any build cache issues.

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