[#866] Clipboardmanager on Android level 21 in Demo-app

* [#866] Clipboardmanager on Android level 21 in Demo-app

- Notification with Toast on API 32 and less added to let users know they have it copied in the clipboard.

* Replace Toast with Snackbar

- Tested with Android API level 21, 23, 29, 31, 33

demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/Navigation.kt

@@ -1,12 +1,14 @@
 package cash.z.ecc.android.sdk.demoapp
 
-import android.annotation.TargetApi
 import android.content.ClipData
 import android.content.ClipboardManager
 import android.content.Context
-import android.os.Build
 import androidx.activity.viewModels
+import androidx.compose.material3.SnackbarDuration
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.lifecycle.compose.ExperimentalLifecycleComposeApi
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.navigation.NavHostController
@@ -21,6 +23,9 @@ import cash.z.ecc.android.sdk.demoapp.ui.screen.addresses.view.Addresses
 import cash.z.ecc.android.sdk.demoapp.ui.screen.home.view.Home
 import cash.z.ecc.android.sdk.demoapp.ui.screen.home.viewmodel.WalletViewModel
 import cash.z.ecc.android.sdk.demoapp.ui.screen.send.view.Send
+import cash.z.ecc.android.sdk.demoapp.util.AndroidApiVersion
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalLifecycleComposeApi::class)
 @Composable
@@ -47,14 +52,23 @@ internal fun ComposeActivity.Navigation() {
             if (null == synchronizer) {
                 // Display loading indicator
             } else {
+                val scope = rememberCoroutineScope()
+                val snackbarHostState = remember { SnackbarHostState() }
                 // I don't like giving synchronizer directly over to the view, but for now it isolates each of the
                 // demo app views
                 Addresses(
                     synchronizer = synchronizer,
                     copyToClipboard = { tag, textToCopy ->
-                        copyToClipboard(applicationContext, tag, textToCopy)
+                        copyToClipboard(
+                            applicationContext,
+                            tag,
+                            textToCopy,
+                            scope,
+                            snackbarHostState
+                        )
                     },
-                    onBack = { navController.popBackStackJustOnce(WALLET_ADDRESS_DETAILS) }
+                    onBack = { navController.popBackStackJustOnce(WALLET_ADDRESS_DETAILS) },
+                    snackbarHostState = snackbarHostState
                 )
             }
         }
@@ -107,16 +121,35 @@ private fun NavHostController.popBackStackJustOnce(currentRouteToBePopped: Strin
     popBackStack()
 }
 
-// Note: this requires API level 23 (current min is 21 for the Demo-app). We should address this requirement, or set
-// our Demo-app min to 23
-@TargetApi(Build.VERSION_CODES.M)
-fun copyToClipboard(context: Context, tag: String, textToCopy: String) {
-    val clipboardManager = context.getSystemService(ClipboardManager::class.java)
+fun copyToClipboard(
+    context: Context,
+    tag: String,
+    textToCopy: String,
+    scope: CoroutineScope,
+    snackbarHostState: SnackbarHostState
+) {
+    val clipboardManager = if (AndroidApiVersion.isAtLeastM) {
+        context.getSystemService(ClipboardManager::class.java)
+    } else {
+        context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+    }
+
     val data = ClipData.newPlainText(
         tag,
         textToCopy
     )
     clipboardManager.setPrimaryClip(data)
+
+    // Notify users with Snackbar only on Android level 32 and lower, as 33 and higher notifies users by its own system
+    // way
+    if (!AndroidApiVersion.isAtLeastT) {
+        scope.launch {
+            snackbarHostState.showSnackbar(
+                message = context.getString(R.string.address_copied, textToCopy),
+                duration = SnackbarDuration.Short
+            )
+        }
+    }
 }
 
 object NavigationTargets {

demo-app/src/main/java/cash/z/ecc/android/sdk/demoapp/ui/screen/addresses/view/AddressesView.kt

@@ -13,6 +13,8 @@ import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
@@ -41,11 +43,13 @@ import kotlinx.coroutines.flow.flow
 fun Addresses(
     synchronizer: Synchronizer,
     copyToClipboard: (String, String) -> Unit,
-    onBack: () -> Unit
+    onBack: () -> Unit,
+    snackbarHostState: SnackbarHostState
 ) {
-    Scaffold(topBar = {
-        AddressesTopAppBar(onBack)
-    }) { paddingValues ->
+    Scaffold(
+        topBar = { AddressesTopAppBar(onBack) },
+        snackbarHost = { SnackbarHost(snackbarHostState) }
+    ) { paddingValues ->
         // TODO [#846]: Slow addresses providing
         // TODO [#846]: https://github.com/zcash/zcash-android-wallet-sdk/issues/846
         val walletAddresses = flow {

demo-app/src/main/res/values/strings.xml

@@ -1,4 +1,4 @@
-<resources>
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
     <string name="app_name">Demo App</string>
     <string name="navigation_drawer_open">Open navigation drawer</string>
     <string name="navigation_drawer_close">Close navigation drawer</string>
@@ -37,6 +37,8 @@
     <string name="unified_address_tag">Zcash unified address</string>
     <string name="sapling_address_tag">Zcash sapling address</string>
     <string name="transparent_address_tag">Zcash transparent address</string>
+    <string name="address_copied" formatted="true"><xliff:g id="address" example="t1TdMMj5zzMtt...">Copied to
+        clipboard: %1$s</xliff:g></string>
 
     <string name="configure_seed">Please select your wallet secret phrase</string>
     <string name="person_alyssa">Alyssa P. Hacker</string>