78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
|
|
||
|
|
Android BasicMultitouch Sample
|
||
|
|
===================================
|
||
|
|
|
||
|
|
Sample demonstrates the use of [MotionEvent][1] properties to keep track of
|
||
|
|
individual touches across multiple touch events.
|
||
|
|
|
||
|
|
[1]: http://developer.android.com/reference/android/view/MotionEvent.html
|
||
|
|
|
||
|
|
Introduction
|
||
|
|
------------
|
||
|
|
|
||
|
|
This is an example of keeping track of individual touches across multiple
|
||
|
|
[MotionEvent][1]s.
|
||
|
|
|
||
|
|
This sample uses a custom View (`TouchDisplayView`) that responds to
|
||
|
|
touch events and draws a colored circle for each touch point. The view holds
|
||
|
|
data related to a touch pointer, including its current position, pressure,
|
||
|
|
and its past touch history.
|
||
|
|
|
||
|
|
The View draws graphics based on data associated with each touch event to a
|
||
|
|
canvas. A large circle indicates the current position of a touch, while smaller
|
||
|
|
trailing circles represent previous positions for that touch.
|
||
|
|
The size of the large circle is scaled depending on the pressure of the user's
|
||
|
|
touch.
|
||
|
|
|
||
|
|
[1]: http://developer.android.com/reference/android/view/MotionEvent.html
|
||
|
|
|
||
|
|
Pre-requisites
|
||
|
|
--------------
|
||
|
|
|
||
|
|
- Android SDK 27
|
||
|
|
- Android Build Tools v27.0.2
|
||
|
|
- Android Support Repository
|
||
|
|
|
||
|
|
Screenshots
|
||
|
|
-------------
|
||
|
|
|
||
|
|
<img src="screenshots/intro.png" height="400" alt="Screenshot"/> <img src="screenshots/touches.png" height="400" alt="Screenshot"/>
|
||
|
|
|
||
|
|
Getting Started
|
||
|
|
---------------
|
||
|
|
|
||
|
|
This sample uses the Gradle build system. To build this project, use the
|
||
|
|
"gradlew build" command or use "Import Project" in Android Studio.
|
||
|
|
|
||
|
|
Support
|
||
|
|
-------
|
||
|
|
|
||
|
|
- Google+ Community: https://plus.google.com/communities/105153134372062985968
|
||
|
|
- Stack Overflow: http://stackoverflow.com/questions/tagged/android
|
||
|
|
|
||
|
|
If you've found an error in this sample, please file an issue:
|
||
|
|
https://github.com/googlesamples/android-BasicMultitouch
|
||
|
|
|
||
|
|
Patches are encouraged, and may be submitted by forking this project and
|
||
|
|
submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
|
||
|
|
|
||
|
|
License
|
||
|
|
-------
|
||
|
|
|
||
|
|
Copyright 2017 The Android Open Source Project, 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.
|