Android

INSTALL_FAILED_UPDATE_INCOMPATIBLE means Android rejected an APK because its signing identity cannot authorize an update to the existing package. This guide covers physical devices, emulators, Android Studio and ADB, prioritizing the correct signing key before profile checks or a destructive uninstall.

This Android exception means an app targeting API level 31 or higher created a PendingIntent without an explicit mutability flag. Diagnose the owning factory call, preserve existing behavioral flags, choose FLAG_IMMUTABLE by default, handle documented mutable cases, and verify app- or dependency-owned repairs safely.

The Android 12+ “android:exported needs to be explicitly specified” build error means an activity, service, or receiver with an intent filter lacks an explicit access setting. Find the owning merged-manifest entry, apply the least-permissive correct value, then verify the final manifest and component behavior.

android.os.FileUriExposedException occurs when an Android app exposes a file:// URI to another app. This developer guide covers locating the exposed URI, choosing an existing content URI or AndroidX FileProvider, narrowing shared paths, applying temporary URI grants, and verifying receiver access without suppressing Android’s detection.

Google Play Billing response code 7, ITEM_ALREADY_OWNED, means Play considers a subscription or one-time product owned, although stale purchase state can cause a mismatch. This Android developer guide covers ownership queries, entitlement reconciliation, consumable handling, and the narrow condition for retrying safely.

android.os.NetworkOnMainThreadException means a native Android app attempted network or name-resolution work on its main UI thread. This guide covers locating the blocking call, using main-safe APIs, Kotlin coroutines, Java Executors or WorkManager, and verifying the repair without disabling StrictMode.

ForegroundServiceDidNotStartInTimeException means Android started a foreground service but did not receive a timely startForeground call. This guide identifies the Android 8.0-11 message variant, corrects native service promotion timing, handles the documented WorkManager shutdown race, and verifies the repair without suppressing the crash.

Android’s “Cleartext HTTP traffic not permitted” error means an unencrypted request was blocked by the app’s network security policy. This guide covers Android apps targeting API 28 or higher, HTTPS migration, packaged-policy verification, and narrowly scoped domain exceptions for unavoidable HTTP endpoints.