Flutter upgrade

lib/anypay/any_pay_payment.dart

@@ -6,14 +6,14 @@ import 'package:cake_wallet/monero/monero.dart';
 
 class AnyPayPayment {
 	AnyPayPayment({
-		@required this.time,
-		@required this.expires,
-		@required this.memo,
-		@required this.paymentUrl,
-		@required this.paymentId,
-		@required this.chain,
-		@required this.network,
-		@required this.instructions});
+		required this.time,
+		required this.expires,
+		required this.memo,
+		required this.paymentUrl,
+		required this.paymentId,
+		required this.chain,
+		required this.network,
+		required this.instructions});
 
 	factory AnyPayPayment.fromMap(Map<String, dynamic> obj) {
 		final instructions = (obj['instructions'] as List<dynamic>)
@@ -45,13 +45,13 @@ class AnyPayPayment {
 				.fold<int>(0, (int outAcc, out) => outAcc + out.amount));
 		switch (chain) {
 			case AnyPayChain.xmr:
-				return monero.formatterMoneroAmountToString(amount: total);
+				return monero!.formatterMoneroAmountToString(amount: total);
 			case AnyPayChain.btc:
-				return bitcoin.formatterBitcoinAmountToString(amount: total);
+				return bitcoin!.formatterBitcoinAmountToString(amount: total);
 			case AnyPayChain.ltc:
-				return bitcoin.formatterBitcoinAmountToString(amount: total);
+				return bitcoin!.formatterBitcoinAmountToString(amount: total);
 			default:
-				return null;
+				return '';
 		}
 	}
 

lib/anypay/any_pay_payment_committed_info.dart

@@ -3,11 +3,11 @@ import 'package:cake_wallet/anypay/any_pay_trasnaction.dart';
 
 class AnyPayPaymentCommittedInfo {
 	const AnyPayPaymentCommittedInfo({
-		@required this.uri,
-		@required this.currency,
-		@required this.chain,
-		@required this.transactions,
-		@required this.memo});
+		required this.uri,
+		required this.currency,
+		required this.chain,
+		required this.transactions,
+		required this.memo});
 
 	final String uri;
 	final String currency;

lib/anypay/any_pay_payment_instruction.dart

@@ -3,11 +3,11 @@ import 'package:cake_wallet/anypay/any_pay_payment_instruction_output.dart';
 
 class AnyPayPaymentInstruction {
 	AnyPayPaymentInstruction({
-		@required this.type,
-		@required this.requiredFeeRate,
-		@required this.txKey,
-		@required this.txHash,
-		@required this.outputs});
+		required this.type,
+		required this.requiredFeeRate,
+		required this.txKey,
+		required this.txHash,
+		required this.outputs});
 
 	factory AnyPayPaymentInstruction.fromMap(Map<String, dynamic> obj) {
 		final outputs = (obj['outputs'] as List<dynamic>)

lib/anypay/any_pay_trasnaction.dart

@@ -1,9 +1,7 @@
-import 'package:flutter/foundation.dart';
-
 class AnyPayTransaction {
-	const AnyPayTransaction(this.tx, {@required this.id, @required this.key});
+	const AnyPayTransaction(this.tx, {required this.id, required this.key});
 
 	final String tx;
 	final String id;
-	final String key;
+	final String? key;
 }

lib/anypay/anypay_api.dart

@@ -33,15 +33,15 @@ class AnyPayApi {
 			case 'litecoin':
 				return CryptoCurrency.ltc;
 			default:
-				return null;
+				throw Exception('Unexpected scheme: ${scheme}');
 		}
 	}
 
 	Future<AnyPayPayment> paymentRequest(String uri) async {
 		final fragments = uri.split(':?r=');
 		final scheme = fragments.first;
-		final url = fragments[1];
-  		final headers = <String, String>{
+		final url = Uri.parse(fragments[1]);
+  	final headers = <String, String>{
   			'Content-Type': contentTypePaymentRequest,
   			'X-Paypro-Version': xPayproVersion,
   			'Accept': '*/*',};
@@ -50,20 +50,20 @@ class AnyPayApi {
 			'currency': currencyByScheme(scheme).title};
 		final response = await post(url, headers: headers, body: utf8.encode(json.encode(body)));
 
-    	if (response.statusCode != 200) {
-			return null;
+    if (response.statusCode != 200) {
+      throw Exception('Unexpected response http code: ${response.statusCode}');
 		}
 
-    	final decodedBody = json.decode(response.body) as Map<String, dynamic>;
-    	return AnyPayPayment.fromMap(decodedBody);
+    final decodedBody = json.decode(response.body) as Map<String, dynamic>;
+    return AnyPayPayment.fromMap(decodedBody);
 	}
 
 	Future<AnyPayPaymentCommittedInfo> payment(
 		String uri,
-		{@required String chain,
-			@required String currency,
-			@required List<AnyPayTransaction> transactions}) async {
-  		final headers = <String, String>{
+		{required String chain,
+			required String currency,
+			required List<AnyPayTransaction> transactions}) async {
+  	final headers = <String, String>{
   			'Content-Type': contentTypePayment,
   			'X-Paypro-Version': xPayproVersion,
   			'Accept': '*/*',};
@@ -71,7 +71,7 @@ class AnyPayApi {
 			'chain': chain,
 			'currency': currency,
 			'transactions': transactions.map((tx) => {'tx': tx.tx, 'tx_hash': tx.id, 'tx_key': tx.key}).toList()};
-		final response = await post(uri, headers: headers, body: utf8.encode(json.encode(body)));
+		final response = await post(Uri.parse(uri), headers: headers, body: utf8.encode(json.encode(body)));
 		if (response.statusCode == 400) {
 			final decodedBody = json.decode(response.body) as Map<String, dynamic>;
 			throw Exception(decodedBody['message'] as String);