幻灯片扩大在动画的android [英] Slide expand animation in android
本文介绍了幻灯片扩大在动画的android的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在Android的一个简单的的ListView
目录结果。在每个项目的点击,我想它滑下扩大和展示的内容。有没有一种简单的方法在Android中做到这一点?
I have a simple ListView
listing results in android. Upon click of each item, I would like it to slide down expand and show the content. Is there an easy way to do this in android?
任何帮助将AP preciated。
Any help will be appreciated.
推荐答案
下面是例如,从Udinic。它ListView项扩大与动画,只需要API级别4+
基本上,你需要一个动画类
Here is example from Udinic. It had listview item expand with animation and require API level only 4+ Basically you need a animation class
/**
* This animation class is animating the expanding and reducing the size of a view.
* The animation toggles between the Expand and Reduce, depending on the current state of the view
* @author Udinic
*
*/
public class ExpandAnimation extends Animation {
private View mAnimatedView;
private LayoutParams mViewLayoutParams;
private int mMarginStart, mMarginEnd;
private boolean mIsVisibleAfter = false;
private boolean mWasEndedAlready = false;
/**
* Initialize the animation
* @param view The layout we want to animate
* @param duration The duration of the animation, in ms
*/
public ExpandAnimation(View view, int duration) {
setDuration(duration);
mAnimatedView = view;
mViewLayoutParams = (LayoutParams) view.getLayoutParams();
// decide to show or hide the view
mIsVisibleAfter = (view.getVisibility() == View.VISIBLE);
mMarginStart = mViewLayoutParams.bottomMargin;
mMarginEnd = (mMarginStart == 0 ? (0- view.getHeight()) : 0);
view.setVisibility(View.VISIBLE);
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
if (interpolatedTime < 1.0f) {
// Calculating the new bottom margin, and setting it
mViewLayoutParams.bottomMargin = mMarginStart
+ (int) ((mMarginEnd - mMarginStart) * interpolatedTime);
// Invalidating the layout, making us seeing the changes we made
mAnimatedView.requestLayout();
// Making sure we didn't run the ending before (it happens!)
} else if (!mWasEndedAlready) {
mViewLayoutParams.bottomMargin = mMarginEnd;
mAnimatedView.requestLayout();
if (mIsVisibleAfter) {
mAnimatedView.setVisibility(View.GONE);
}
mWasEndedAlready = true;
}
}
}
和使用:
View toolbar = view.findViewById(R.id.toolbar);
// Creating the expand animation for the item
ExpandAnimation expandAni = new ExpandAnimation(toolbar, 500);
// Start the animation on the toolbar
toolbar.startAnimation(expandAni);
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