[#1316] Readable TxId on TransactionOverview

Closes #1316

CHANGELOG.md

@@ -6,6 +6,9 @@ and this library adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- `TransactionOverview.txIdString()` to provide a readable transaction ID to SDK-consuming apps
+
 ### Changed
 - Gradle 8.5
 - Kotlin 1.9.21

sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/TransactionOverview.kt

@@ -1,5 +1,6 @@
 package cash.z.ecc.android.sdk.model
 
+import cash.z.ecc.android.sdk.internal.ext.toHexReversed
 import cash.z.ecc.android.sdk.internal.model.DbTransactionOverview
 
 /**
@@ -29,6 +30,11 @@ data class TransactionOverview internal constructor(
 ) {
     override fun toString() = "TransactionOverview"
 
+    /**
+     * @return Transaction ID in String obtained from `rawId`
+     */
+    fun txIdString() = rawId.byteArray.toHexReversed()
+
     companion object {
         internal fun new(
             dbTransactionOverview: DbTransactionOverview,