Introduction

This Android build error usually appears after upgrading to Support Library 26.0.0 while still compiling the app against an older SDK. The failing resource reference is a symptom of a version mismatch: the library expects framework attributes that do not exist in the compile SDK currently used by the project.

Core Sections

Why the keyboardNavigationCluster attribute breaks the build

android:keyboardNavigationCluster was introduced in Android 8.0, which is API level 26. Support Library 26.0.0 contains resources that reference framework attributes from API 26. If your project still uses compileSdkVersion 25 or lower, the Android resource merger cannot resolve that attribute and aborts the build.

The important point is that this is usually not a broken layout file. It is a build configuration mismatch between the support library version and the compile SDK.

The fix is compileSdkVersion, not minSdkVersion

The normal fix is to compile the project with API 26 or later.

1android {
2    compileSdkVersion 26
3
4    defaultConfig {
5        minSdkVersion 16
6        targetSdkVersion 26
7    }
8}
9
10dependencies {
11    implementation "com.android.support:appcompat-v7:26.0.0"
12    implementation "com.android.support:design:26.0.0"
13}

A lot of developers change targetSdkVersion first and wonder why nothing improves. That does not solve this error. The compiler needs access to the attribute definition at build time, so compileSdkVersion is the setting that matters.

minSdkVersion is different. It only describes the oldest device version the app can run on. You can still compile against API 26 and support devices well below 26.

Keep support library versions aligned

Older Android projects often include several support artifacts. Those artifacts should usually stay on the same version line.

1dependencies {
2    implementation "com.android.support:appcompat-v7:26.0.0"
3    implementation "com.android.support:recyclerview-v7:26.0.0"
4    implementation "com.android.support:design:26.0.0"
5}

If one module uses 26.0.0 and another still pulls 25.x, Gradle may resolve a messy dependency graph and produce resource errors that are harder to diagnose. Version alignment removes that ambiguity.

Make sure the local SDK platform is actually installed

Sometimes the Gradle file is already correct, but the machine building the project does not have Android SDK Platform 26 installed. In that case, the project still behaves as though API 26 were unavailable.

The simplest verification steps are:

1. Confirm API 26 is installed in the Android SDK manager.
2. Sync Gradle after the install.
3. Clean and rebuild if the resource cache is stale.

A configuration that exists only in build.gradle is not enough if the actual platform package is missing from the build environment.

If you cannot move to API 26 yet

Sometimes a legacy codebase is temporarily pinned to an older compile SDK because of plugins, build tools, or corporate constraints. In that case, the short-term workaround is to stay on a support library line that matches the current compile SDK instead of partially upgrading to 26.0.0.

That is not a long-term strategy, but it is cleaner than mixing incompatible versions and chasing secondary build errors.

Modern projects and the AndroidX equivalent

Current Android projects generally use AndroidX instead of the old support libraries. You are more likely to see this exact message in a legacy project or when maintaining older code. The principle, however, still matters today: if a dependency references newer framework resources, your project must compile against a compatible SDK.

So even though the package names have changed in modern apps, the debugging approach is the same. Match the library generation with the compile SDK and keep dependency versions internally consistent.

Common Pitfalls

• Changing targetSdkVersion instead of compileSdkVersion does not fix a missing framework attribute during compilation.
• Upgrading one support library artifact while leaving the rest on older versions often creates secondary resource-resolution problems.
• Searching XML files for a typo wastes time when the real issue is the project’s SDK configuration.
• Forgetting to install the API 26 platform locally can make a correct Gradle file appear broken.
• Treating the support library upgrade as isolated work ignores the fact that compile SDK, build tools, and dependency versions need to move together.

Summary

• 'android:keyboardNavigationCluster requires compiling against API 26 or later.'
• Support Library 26.0.0 should be paired with compileSdkVersion 26 or higher.
• 'minSdkVersion can stay lower because runtime support and compile-time definitions are different concerns.'
• Keep support library artifacts on the same version line.
• If the project cannot move to API 26 yet, stay on an older support library release until the upgrade can be done cleanly.