Clear most build warnings (#187)

* Clear the warns build

* Supress inline CurrencyFormatter.kt and Twig.kt
Add FlowPreview into bulild.grandle
Minor change

* Add supres inline at the file level

* Add suppress inline at the file level

build.gradle

@@ -135,6 +135,14 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+
+    // ExperimentalCoroutinesApi and FlowPreview help to clear the build warnings
+    kotlinOptions {
+        jvmTarget = "1.8"
+        freeCompilerArgs += "-Xopt-in=kotlinx.coroutines.ExperimentalCoroutinesApi"
+        freeCompilerArgs += "-Xopt-in=kotlinx.coroutines.FlowPreview"
+    }
+
     packagingOptions {
         exclude 'META-INF/DEPENDENCIES'
         exclude 'META-INF/LICENSE'

src/main/java/cash/z/ecc/android/sdk/ext/CurrencyFormatter.kt

@@ -1,3 +1,5 @@
+@file:Suppress("NOTHING_TO_INLINE")
+
 package cash.z.ecc.android.sdk.ext
 
 import cash.z.ecc.android.sdk.ext.Conversions.USD_FORMATTER

src/main/java/cash/z/ecc/android/sdk/ext/Twig.kt

@@ -1,5 +1,6 @@
-package cash.z.ecc.android.sdk.ext
+@file:Suppress("NOTHING_TO_INLINE")
 
+package cash.z.ecc.android.sdk.ext
 import java.util.concurrent.CopyOnWriteArraySet
 import kotlin.math.roundToLong
 

src/main/java/cash/z/ecc/android/sdk/transaction/WalletTransactionEncoder.kt

@@ -175,7 +175,7 @@ class WalletTransactionEncoder(
             if (response.isSuccessful) {
                 twig("fetch succeeded")
                 val file = File(destinationDir, paramFileName)
-                if(file.parentFile.exists()) {
+                if(file.parentFile?.exists() == true) {
                     twig("directory exists!")
                 } else {
                     twig("directory did not exist attempting to make it")