show balance

samples/demo-app/app/src/main/java/cash/z/ecc/android/sdk/demoapp/demos/getbalance/GetBalanceFragment.kt

@@ -1,12 +1,91 @@
 package cash.z.ecc.android.sdk.demoapp.demos.getbalance
 
+import android.os.Bundle
 import android.view.LayoutInflater
+import androidx.lifecycle.lifecycleScope
+import cash.z.ecc.android.bip39.Mnemonics
+import cash.z.ecc.android.bip39.toSeed
+import cash.z.ecc.android.sdk.Initializer
+import cash.z.ecc.android.sdk.Synchronizer
+import cash.z.ecc.android.sdk.block.CompactBlockProcessor
+import cash.z.ecc.android.sdk.demoapp.App
 import cash.z.ecc.android.sdk.demoapp.BaseDemoFragment
 import cash.z.ecc.android.sdk.demoapp.databinding.FragmentGetBalanceBinding
+import cash.z.ecc.android.sdk.ext.collectWith
+import cash.z.ecc.android.sdk.ext.convertZatoshiToZecString
+import cash.z.ecc.android.sdk.tool.DerivationTool
 
 class GetBalanceFragment : BaseDemoFragment<FragmentGetBalanceBinding>() {
 
+    private lateinit var synchronizer: Synchronizer
+    private lateinit var viewingKey: String
+
     override fun inflateBinding(layoutInflater: LayoutInflater): FragmentGetBalanceBinding =
         FragmentGetBalanceBinding.inflate(layoutInflater)
 
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+        setup()
+    }
+
+    private fun setup() {
+        //
+        var seedPhrase = sharedViewModel.seedPhrase.value
+
+        val seed = Mnemonics.MnemonicCode(seedPhrase).toSeed()
+
+        viewingKey = DerivationTool.deriveViewingKeys(seed).first()
+
+        App.instance.defaultConfig.let { config ->
+            Initializer(App.instance) {
+                it.importWallet(viewingKey, config.birthdayHeight)
+                it.server(config.host, config.port)
+            }.let { initializer ->
+                synchronizer = Synchronizer(initializer)
+            }
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        // the lifecycleScope is used to dispose of the synchronizer when the fragment dies
+        synchronizer.start(lifecycleScope)
+        monitorChanges()
+    }
+
+    private fun monitorChanges() {
+        synchronizer.status.collectWith(lifecycleScope, ::onStatus)
+        synchronizer.balances.collectWith(lifecycleScope, ::onBalance)
+    }
+
+    private var isSyncing = true
+        set(value) {
+            field = value
+        }
+
+    private fun onBalance(balance: CompactBlockProcessor.WalletBalance) {
+        this.balance = balance
+        if (!isSyncing) {
+            binding.textBalance.text = """
+                Available balance: ${balance.availableZatoshi.convertZatoshiToZecString(12)}
+                Total balance: ${balance.totalZatoshi.convertZatoshiToZecString(12)}
+            """.trimIndent()
+        }
+    }
+
+    private var balance = CompactBlockProcessor.WalletBalance()
+        set(value) {
+            field = value
+        }
+
+
+    private fun onStatus(status: Synchronizer.Status) {
+        binding.textBalance.text = "Status: $status"
+        isSyncing = status != Synchronizer.Status.SYNCED
+        if (status == Synchronizer.Status.SCANNING) {
+            binding.textBalance.text = "Calculating balance..."
+        } else {
+            if (!isSyncing) onBalance(balance)
+        }
+    }
 }

samples/demo-app/app/src/main/res/layout/fragment_get_balance.xml

@@ -1,6 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout
-    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <TextView
+        android:id="@+id/text_balance"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"/>
+
 </androidx.constraintlayout.widget.ConstraintLayout>