The animation implementation method of Android development

This article describes the animation implementation of Android development. Share to everyone for your reference. The specific analysis is as follows:

The animation is divided into three kinds:

Frames-by-frame animation, layout animations, and control animations

Control animation Implementation

By overriding the animation applytransformation (float interpolatedtime, transformation t) function to implement a custom animation effect, it is also generally implemented in initialize (int width, int height, int parentwidth, int parentheight) function, which is a callback function that tells animation the size parameter of the target view, where you can initialize some of the relevant parameters, such as setting the animation duration, Set the Interpolator, set the animation reference point, and so on.

OPhone calls the Applytransformation function repeatedly in the process of drawing an animation, and the parameter Interpolatedtime value changes from 0 to 1, which indicates that the animation ends when the argument is 1 o'clock. By using the parameter transformation to obtain the matrix of transformation, a variety of complex effects can be achieved by changing the matrix.

The following example illustrates a control animation:

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Animation anim = new Animation () {@Override protected void applytransformation (float interpolatedtime, transformation t) {if (interpolatedtime = = 1) {v.setvisibility (view.gone);} else {v.getlayoutparams (). Height = initialheight-(int) (INI Tialheight * interpolatedtime); V.requestlayout (); @Override public boolean willchangebounds () {return true;}};

In the example, the height of a view is gradually changed from the original height to 0. When the animation is over, the view disappears.

I hope this article will help you with your Android program.