Multi touch application for android

Android is a trademark of Google Inc. Linux is a trademark of Linux Foundation. Multimedia Files: Download All Files.

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Business Wire. Download Thumbnail Download Preview Download Small Download Full Size Download Square 5. Download Square Back To Top. Follow Us. All events and the position of the pointers are included in the instance of MotionEvent which you receive in the onTouch method. To track the touch events from multiple pointers you have to use the MotionEvent. This pointer index can change over time, e.

java - Android Smooth Multi-touch Drawing - Stack Overflow

The stable version of a pointer is the pointer id , which can be determined with the getPointerId pointerIndex method from the MotionEvent object. Android provide the GestureDetector class which allow to consume MotionEvents and to create higher level gesture events to listeners. For example the ScaleGestureDetector class allows to determine the predefined gesture of increasing and decreasing the size of the object via two fingers.

The following assumes that you have already basic knowledge in Android development.


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Create an Android project called com. This activity uses a DialogFragment to set the color which is used for drawing.

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Create the following TouchEventView class which implements a View which supports single touch. If you run your application you will be able to draw on the screen with your finger or with the mouse in the emulator. To use your own view in an XML layout definition you have to use the full-qualified class name class including package information.

Add code to your drawing example so that the current position of a finger is marked via a circle. To draw a circle you can use the addCircle x, y, 50, Path. CW method call on a Path or use the canvas element directly. Make sure that only the current position is highlighted with a circle. The circle should appears as soon as the finger goes down and vanish once the finger goes up. In this exercise you create a view which support multitouch and allows you to track several fingers on your device. On the Android emulator you can only simulate singletouch with the mouse.

If you run your application you will be able to draw on the screen with your fingers. Every device has an upper limit how many pointers are supported, test out how many simultaneous pointers your device supports. This application should look similar to the following screenshot. Create the Android project called de. If you run your application you should be able to shrink and enlarge the image via a multi-touch gesture pitch zoom.

Google blog post about touch and multi touch. Android ListView and ListActivity. Android and Networking. Android Assets Studio. Free use of the software examples is granted under the terms of the Eclipse Public License 2. Lars Vogel c , vogella GmbH Version 1. Single and multi touch in Android. This tutorial describes how to use the touch API in Android applications.

Android Touch 1. Android touch basics The Android standard View class support touch events.


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Single touch If single input is used you can use the getX and getY methods to get the current position of the first finger. Multi touch Multi-touch is available since Android 2. Multitouch can not be tested on the emulator. You need a real Android device as input device.

Check How Many Multi Touch Points your Android Screen Supports

GestureDetectors Android provide the GestureDetector class which allow to consume MotionEvents and to create higher level gesture events to listeners. Prerequisites The following assumes that you have already basic knowledge in Android development. Custom view and touch events 3. Draw via touch This exercise demonstrates the handling of single touch events within a custom view. Context ; import android.

This lesson teaches you to

Canvas ; import android. Color ; import android. Paint ; import android. Path ; import android.