新增Retrofit dependencies

• implementation 'com.squareup.retrofit2:retrofit:2.9.0'
  implementation 'com.squareup.okhttp3:okhttp:4.9.3'
  implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0'
  implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.0'
  implementation 'com.squareup.retrofit2:converter-scalars:2.9.0'
  

於 manifests/AndroidManifest.xml 新增請求許可

• <uses-permission android:name="android.permission.INTERNET" />
  

建立 GET 請求

• @GET("/")
  suspend fun getContents(): String