ConstraintLayout performance comparison

This app is an example test set that compares how the different ViewGroups (ConstraintLayout vs traditional layouts) affects the UI performance.

Introduction

This app runs the measure/layout passes with the layout using ConstraintLayout and using traditional layouts (RelativeLayout and LinearLayout), both of them result in the same appearance but how the UI components are built is different.

While running the measure/layout passes, the performance of UI is measured by using Systrace and OnFrameMetricsAvailableListener

Pre-requisites

You need to know:

• Review the XML file to know how each layout is built
  • Layout using ConstraintLayout
  • Layout using traditional layouts

How to run the tests

1. Download the code.
2. Open the terminal at the downloaded directory.
3. Run the following shell script ./run.sh <device_id>

• The script is going to generate two html files as a result of running Systrace. Each represents the performance result for the layout with ConstraintLayout and with traditional.

(Optional)

• The app also logs the measurement result using OnFrameMetricsAvailableListener, but it isn't exported to any external files. You can check those stats as well.

Measurement result example

Here is the example measurement result.

unit: ms, Time taken in measure and layout phases average of 100 frames

Measurement environment

Device	Nexus 5X
Android Version	8.0
ConstraintLayout version	1.0.2

License

Copyright 2017 Google, Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.