基于Android Studio 3.0.1的签名APK：验证与禁用Zopfli压缩

Hey there! Let's tackle your two questions about Zopfli compression in Android Studio 3.0.1 with buildToolsVersion 26.0.3.

Zopfli is an optimized implementation of the DEFLATE compression algorithm, so it doesn't show up as a separate method—you'll need to check via Android Studio's tools or infer from compression rates. Here are the easiest ways:

1. Use Android Studio's APK Analyzer (Most Straightforward) #

• Open Android Studio, go to Build > Analyze APK... and select your signed APK.
• In the left panel, expand the file list to view individual items. Look at the Compression column:
  • If a file shows Deflate (Zopfli), that means it was compressed with Zopfli.
  • Note: Already compressed files like PNG/JPG images won't be re-compressed with Zopfli, so focus on files like classes.dex, XML layouts, or raw resources.

2. Command Line Check (Using zipinfo) #

• Open a terminal, navigate to your APK's directory, and run:

  zipinfo -v your-signed-apk.apk | grep -A 2 "compression method"
  

• Zopfli uses the same deflated method as standard DEFLATE, but you'll notice a higher compression ratio (e.g., 75-80% vs. 60-70% for regular DEFLATE) for files processed with it. Since Android Studio 3.0+ enables Zopfli by default for release builds, this is a good secondary check if you don't want to use APK Analyzer.

First, a key point: zipalign doesn't handle compression at all—it only aligns file offsets in the APK to optimize runtime memory loading. Zopfli compression happens during the APK packaging step by the Android Gradle Plugin. To disable it, modify your build configuration:

1. Disable for a Single Module #

Open your module-level build.gradle file, and add the compressionOptions block inside the release build type:

android {
    buildToolsVersion "26.0.3"
    // ... other global configs

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            
            // Disable Zopfli compression
            compressionOptions {
                useZopfli false
            }
        }
    }
}

2. Disable Globally (All Modules) #

Open your project's root gradle.properties file and add this line:

android.enableZopfli=false

After making either change, rebuild your signed APK. The resulting file will use standard DEFLATE compression instead of Zopfli. When you run zipalign (either automatically via Android Studio or manually with zipalign -v 4 input.apk output.apk), it will process the non-Zopfli compressed APK as usual.

内容的提问来源于stack exchange，提问作者steven274