Android realizes the method of rotating, zooming in and out pictures

This paper describes the method of rotating, zooming in and zooming out pictures on Android. Share with you for your reference, as follows:

A preview picture function is required in the project

Initially, it was envisaged to customize a view. In OnDraw, a new bitmap was generated to zoom in and out

However, because the memory of the mobile phone is limited, the core will be lost after zooming in several times.

Later, ImageView is directly selected to complete this task. Unfortunately, although the bitmap will not be generated repeatedly, resulting in the loss of the core, the size limit of ImageView is that the image can no longer be enlarged or enlarged, and can only be in this area.

Finally, I chose to do it with drawable

More readers interested in Android related content can view the special topics of this site: summary of Android graphics and image processing skills, introduction and advanced tutorial of Android development, summary of Android debugging skills and solutions to common problems, summary of Android multimedia operation skills (audio, video, recording, etc.), summary of Android basic component usage Summary of Android view skills, summary of Android layout skills and summary of Android control usage

I hope this article will help you in Android programming.