React Native Android集成PayPal SDK问题：打包APK后应用无法启动

Hey there! Let's tackle this APK launch issue with the sharafat/react-native-paypal package. Since it works smoothly on the emulator but breaks on release builds, here are some quick, actionable fixes you can try right away:

Release builds use ProGuard/R8 to shrink and obfuscate code, which often accidentally strips critical PayPal SDK classes. Add these rules to your android/app/proguard-rules.pro file to protect the required classes:

# Keep core PayPal SDK classes from being obfuscated
-keep class com.paypal.** { *; }
-keep class com.braintreepayments.** { *; }

# Silence warnings for PayPal-related dependencies
-dontwarn com.paypal.**
-dontwarn com.braintreepayments.**

Also double-check your android/app/build.gradle to ensure ProGuard is using your custom rules:

buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}

Stale cache can cause dependency mismatches in release builds. Run these commands in your project root:

cd android && ./gradlew clean
cd .. && npx react-native run-android --mode release

This will clear old build artifacts and force a fresh sync of all dependencies.

Incorrect signing configs can break third-party SDK initialization. Make sure your android/app/build.gradle has a valid release signing setup:

signingConfigs {
    release {
        storeFile file('your-release-keystore.jks')
        storePassword 'your-store-password'
        keyAlias 'your-key-alias'
        keyPassword 'your-key-password'
    }
}

buildTypes {
    release {
        signingConfig signingConfigs.release
        // ... other release settings
    }
}

If you're testing a signed APK, ensure you're using the correct keystore file and credentials.

To pinpoint the exact crash cause, enable debug logging in your release build temporarily. Add this line to the release block in android/app/build.gradle:

debuggable true

Then generate the APK again, install it on a device, and run:

adb logcat *:E

Look for error messages related to PayPal or the react-native-paypal package—this will tell you exactly which class or method is failing.

Since this is a fork of an unmaintained package, head to the sharafat/react-native-paypal GitHub repo's issues page to see if other developers have reported the same release build crash. You might find a specific commit or workaround from the community.

内容的提问来源于stack exchange，提问作者ahmet