Android之自定义Animation

最新推荐文章于 2024-02-22 11:20:51 发布

iteye_17138

最新推荐文章于 2024-02-22 11:20:51 发布

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文章标签：移动开发

本文探讨了在Android应用中实现动画效果的方法，包括自定义动画类MyAnim的创建、参数设置以及与生命周期方法的结合使用，展示了如何通过动画实现按钮状态的切换，提升用户体验。

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public class AnimTest extends Activity{

// ....生命周期方法略

public void startAnim(View view, int deltaY){
MyAnim anim = new MyAnim(view,deltaY,true);
anim.setFillAfter(true);
anim.setFillEnabled(true);
anim.setDuration(500);
anim.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
button1.setEnabled(false);
button2.setEnabled(true);
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationEnd(Animation animation) {

button1.setVisibility(View.INVISIBLE);
button2.setVisibility(View.VISIBLE);
}
});
view.startAnimation(anim);
}

class MyAnim extends Animation {
private View view;
private int deltaY;
private boolean initiallyCollapsed;

public MyAnim(View view, int deltaY, boolean initiallyCollapsed) {
this.view = view;
this.deltaY = deltaY;
this.initiallyCollapsed = initiallyCollapsed;
}

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {

int newHeight;
if (this.initiallyCollapsed) {
newHeight = (int) (this.deltaY * interpolatedTime);
} else {
newHeight = (int) (this.deltaY * (1 - interpolatedTime));
}
view.getLayoutParams().height = newHeight;
view.requestLayout();
}

@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
}

}
}