Скачать или смотреть Lecture 34: Android Animations with Example

Android Animations :
In android, Animations are used to change the appearance and behavior of the objects over a particular interval of time.
The animations will provide a better look and feel high-quality user interface for our applications.
Generally, the animations are useful when we want to notify users about the changes happening in our app, such as new content loaded or new actions available, etc.
We have a different type of animations available in android, here we will discuss the most commonly used android animations such as zoom in / zoom out, fade in / fade out, slide up / slide down etc.
Create XML File to Define Animation:
Create a new folder anim under res directory first.
Create slide_up.xml and slide_down.xml files under anim folder.
To use Slide Up or Slide Down animations in our android applications, we need to define a new XML file with scale tag.
For Slide Up animation, we need to set android:fromYScale="1.0" and android:toYScale="0.0".

For Slide Down animation, we need to set android:fromYScale="0.0" and android:toYScale="1.0".
Once we are done with creation of required animation XML files, we need to load those animation files using different properties.
Android Load and Start the Animation:
In android, we can perform animations by using AnimationUtils component methods such as loadAnimation().
Following is the code for loading and starting an animation using loadAnimation() and startAnimation() methods.
For Slide Down animation, we need to set android:fromYScale="0.0" and android:toYScale="1.0".
Once we are done with creation of required animation XML files, we need to load those animation files using different properties.
Android Load and Start the Animation:
In android, we can perform animations by using AnimationUtils component methods such as loadAnimation().
Following is the code for loading and starting an animation using loadAnimation() and startAnimation() methods.
ImageView img = (ImageView)findViewById(R.id.imgvw);
Animation aniSlide = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.slide_up);
img.startAnimation(aniSlide);
If you observe above code, we are adding an animation to the image using loadAnimation() method.
The second parameter in loadAnimation() method is the name of our animation xml file.
Another method startAnimation() to apply the defined animation to imageview object.

Prof. A. M. Jagtap
MTech CSE