无法在App中集成Firebase，Manifest合并失败错误求助

Looks like you're hitting a common manifest merger issue caused by conflicting versions of the Android Support Library in your dependencies. Here's how to resolve it quickly:

Root Cause #

Your app is including two different versions of support libraries: com.android.support:design:26.0.0-beta1 and com.android.support:support-v4:26.1.0. The manifest merger tool can't decide which version's meta-data#android.support.VERSION value to use, hence the error.

Solution 1: Use tools:replace as Suggested #

Follow the error's recommendation to override the conflicting value:

• First, add the tools namespace to your root <manifest> element if it's not already there:

  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      package="com.your.app.package">
  

• Locate (or add) the <meta-data> tag for android.support.VERSION in your AndroidManifest.xml, then add the tools:replace attribute:

  <meta-data
      android:name="android.support.VERSION"
      android:value="26.1.0"
      tools:replace="android:value" />
  

This tells the merger to use the version you specify (26.1.0) instead of the conflicting one from the design library.

Solution 2: Force Uniform Support Library Versions (Recommended) #

A more robust fix is to ensure all support libraries in your project use the same version. Add this to your app-level build.gradle file:

android {
    // ... your existing configuration
    configurations.all {
        resolutionStrategy.force 'com.android.support:support-v4:26.1.0'
        resolutionStrategy.force 'com.android.support:design:26.1.0'
    }
}

This forces all dependencies to use the specified versions, eliminating version conflicts entirely.

After making either change, clean and rebuild your project to apply the fixes.

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