This sample demonstrates how to create a custom View that allows the user to draw on the screen with their finger.
This project provides a clear and concise example of:
- Creating a custom View by extending the View class.
- Handling touch events to capture user input.
- Using Canvas and Paint to draw on the screen.
- Creating a simple drawing application. This sample can be used as a starting point for creating more complex custom Views or for learning about touch event handling and drawing in Android.
The SignatureView class is a custom View that extends the View class. It uses a Paint object to define the color and style of the drawing and a Path object to store the user's drawing path.
The onTouchEvent() method is overridden to handle touch events. When the user touches the screen (ACTION_DOWN), the starting point of the path is set. As the user moves their finger (ACTION_MOVE), the path is updated and the view is invalidated to redraw the screen.
The onDraw() method is overridden to draw the path on the Canvas using the Paint object.
To use the SignatureView, simply add it to your layout XML file:
<view class="ua.turskyi.fingerdrawing.CanvasActivity$SignatureView"
android:layout_width="match_parent" android:layout_height="match_parent" />This will create a full-screen drawing area where the user can draw with their finger.
For any inquiries or suggestions, please open an issue on the GitHub repository or reach out to me directly at dmytro@turskyi.com.