导入API18的Eclipse ADT项目至AndroidStudio后Gradle构建Material样式报错求助

Hey there, let's tackle this error you're seeing. Those missing TextAppearance.Material resources are a common issue when importing old Eclipse projects (targeting API 18) into Android Studio, and here's why and how to fix it:

What's Causing This? #

Material Design-related styles like TextAppearance.Material were first introduced in Android 5.0 (API Level 21). Your project is set to target API 18, but the auto-generated Gradle config from the import might be pulling in newer support libraries or using a higher compile SDK that references these incompatible resources.

Step 1: Fix Your Module's build.gradle Config #

Open your app-level build.gradle file (under app/) and adjust these key settings:

1. Set a Compatible Compile SDK Version
   You can keep supporting API 18 as your minimum, but set compileSdkVersion to 21 or higher (I recommend 28 for better compatibility with older support libraries):

   android {
       compileSdkVersion 28
       defaultConfig {
           applicationId "your.package.name"
           minSdkVersion 18
           targetSdkVersion 18 // You can upgrade this to 28 if you want, but 18 works too
           versionCode 1
           versionName "1.0"
       }
   }
   

2. Update Support Library Versions
   From your import summary, android-support-v4.jar was replaced with com.android.support:support-v4:18.0.0—this version is way too old. Match it to your compileSdkVersion:

   dependencies {
       // For SDK 28, use this:
       implementation 'com.android.support:support-v4:28.0.0'
       // If you're using appcompat, add this too (same version):
       // implementation 'com.android.support:appcompat-v7:28.0.0'
   }
   

   Pro tip: If you use appcompat-v7, its version must match your compileSdkVersion to avoid resource conflicts.

3. Pin Google Play Services Version
   The import used com.google.android.gms:play-services:+, which pulls the latest version (incompatible with API 18). Use a stable version that works with your compile SDK:

   // For SDK 28, this version works well:
   implementation 'com.google.android.gms:play-services:17.0.0'
   // Even better: Only import the modules you need (e.g., maps, location) to reduce app size
   // implementation 'com.google.android.gms:play-services-maps:17.0.0'
   

Step 2: Check Your App's Theme #

Open res/values/styles.xml and make sure your theme uses a backward-compatible parent, not a Material-only one:

<!-- Avoid Theme.Material (API 21+ only) -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Your custom theme attributes go here -->
</style>

If your original Eclipse project used Theme.Holo styles, you can keep using those too—but AppCompat themes offer better cross-version support.

Step 3: Clean & Rebuild #

After making these changes:

1. Go to Build > Clean Project
2. Then Build > Rebuild Project
3. If you still have issues, try File > Invalidate Caches... > Invalidate and Restart to clear Android Studio's cache.

If It Still Doesn't Work, Share These Details #

If the above steps don't fix the error, I'll need a bit more info to help:

• Full content of your app-level build.gradle file
• Contents of res/values/styles.xml and res/values-v21/styles.xml (if it exists)
• Any other library dependencies your project uses that might reference Material styles

内容的提问来源于stack exchange，提问作者me.at.coding