Import Xposed bridge library in Android Studio

Make a directory like /app/deps ,and put the XposedBridgeApi.jar in it.

Edit /app/build.gradle like this

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    provided fileTree(dir: 'deps', include: ['*.jar'])
}

Click "Sync Project with Gradle Files" in Android Stuido.
You are done!