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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/// Measure application memory usage after pausing and resuming the app
/// with the Android back button.
import 'package:flutter_devicelab/framework/devices.dart';
import 'package:flutter_devicelab/framework/framework.dart';
import 'package:flutter_devicelab/framework/utils.dart';
import 'package:flutter_devicelab/tasks/perf_tests.dart';
const String packageName = '';
const String activityName = '';
class BackButtonMemoryTest extends MemoryTest {
BackButtonMemoryTest() : super('${flutterDirectory.path}/dev/integration_tests/flutter_gallery', 'test_memory/back_button.dart', packageName);
AndroidDevice? get device => super.device as AndroidDevice?;
int get iterationCount => 5;
/// Perform a series of back button suspend and resume cycles.
Future<void> useMemory() async {
await launchApp();
await recordStart();
for (int iteration = 0; iteration < 8; iteration += 1) {
print('back/forward iteration $iteration');
// Push back button, wait for it to be seen by the Flutter app.
await device!.shellExec('input', <String>['keyevent', 'KEYCODE_BACK']);
await receivedNextMessage;
// Give Android time to settle (e.g. run GCs) after closing the app.
await Future<void>.delayed(const Duration(milliseconds: 100));
// Relaunch the app, wait for it to launch.
final String output = await device!.shellEval('am', <String>['start', '-n', '$packageName/$activityName']);
print('adb shell am start: $output');
if (output.contains('Error')) {
fail('unable to launch activity');
await receivedNextMessage;
// Wait for the Flutter app to settle (e.g. run GCs).
await Future<void>.delayed(const Duration(milliseconds: 100));
await recordEnd();
Future<void> main() async {
deviceOperatingSystem =;
await task(BackButtonMemoryTest().run);