Android implementation of multi touch, free zoom image example code

• Android

Knowledge points involved in Android multi touch

1、ScaleGestureDetector

2、OnScaleGestureListener

3、Matrix

4、OnTouchListener

Four knowledge points need to be understood. It should be noted that the matrix is a one-dimensional array in memory, and the matrxi controlling the picture is a 3x3 matrix, that is, a one-dimensional array of size 9 in memory.

Realize multi touch and freely change pictures

1. Inheritance based on ImageView

2. Because you want to get the relevant properties after the picture is loaded, implement the ongloballayoutlistener interface and the method ongloballayout

Register the ongloballayoutlistener interface:

Implement the ongloballayout method

3、

4. Next is the scalegestuuredetector

5. Onscale gesturelistener is an important method in

6、

7、checkoutBounds()

8. Getscalematrix (drawable) this method can be emulated elsewhere

Through this control, you can be familiar with the implementation of multi touch and the knowledge of graphic matrix

Demo address: zoomimageview

The above is the whole content of this article. I hope it will be helpful to your study, and I hope you can support programming tips.

The content of this article comes from the network collection of netizens. It is used as a learning reference. The copyright belongs to the original author.
THE END
分享
二维码
< <上一篇
下一篇>>