android仿path菜单效果

package com.ljp.pathmenu; import android.content.Context; import android.view.ViewGroup; import android.view.ViewGroup.MarginLayoutParams; import android.view.animation.Animation; import android.view.animation.AnticipateInterpolator; import android.view.animation.OvershootInterpolator; import android.view.animation.RotateAnimation; import android.view.animation.TranslateAnimation; import android.widget.ImageButton; public class MyAnimations{ private static int xOffset = 15; private static int yOffset = -13; public static void initOffset(Context context){//由布局文件 xOffset = (int) (10.667 *context.getResources().getDisplayMetrics().density); yOffset = -(int) (8.667 *context.getResources().getDisplayMetrics().density); } public static Animation getRotateAnimation(float fromDegrees ,float toDegrees,int durationMillis){ RotateAnimation rotate = new RotateAnimation(fromDegrees, toDegrees, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setDuration(durationMillis); rotate.setFillAfter(true); return rotate; } public static void startAnimationsIn(ViewGroup viewgroup,int durationMillis) { for (int i = 0; i < viewgroup.getChildCount(); i++) { ImageButton inoutimagebutton = (ImageButton) viewgroup .getChildAt(i); inoutimagebutton.setVisibility(0); MarginLayoutParams mlp = (MarginLayoutParams) inoutimagebutton.getLayoutParams(); Animation animation = new TranslateAnimation(mlp.rightMargin-xOffset,0F,yOffset + mlp.bottomMargin, 0F); animation.setFillAfter(true);animation.setDuration(durationMillis); animation.setStartOffset((i * 100) / (-1 + viewgroup.getChildCount())); animation.setInterpolator(new OvershootInterpolator(2F)); inoutimagebutton.startAnimation(animation); } } public static void startAnimationsOut(ViewGroup viewgroup,int durationMillis) { for (int i = 0; i < viewgroup.getChildCount(); i++) { final ImageButton inoutimagebutton = (ImageButton) viewgroup .getChildAt(i); MarginLayoutParams mlp = (MarginLayoutParams) inoutimagebutton.getLayoutParams(); Animation animation = new TranslateAnimation(0F,mlp.rightMargin-xOffset, 0F,yOffset + mlp.bottomMargin); animation.setFillAfter(true);animation.setDuration(durationMillis); animation.setStartOffset(((viewgroup.getChildCount()-i) * 100) / (-1 + viewgroup.getChildCount()));//顺序倒一下比较舒服 animation.setInterpolator(new AnticipateInterpolator(2F)); animation.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation arg0) {} @Override public void onAnimationRepeat(Animation arg0) {} @Override public void onAnimationEnd(Animation arg0) { // TODO Auto-generated method stub inoutimagebutton.setVisibility(8); } }); inoutimagebutton.startAnimation(animation); } } }