Android Open Source - MultiWork Expand Collapse Animation

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License

The source code is released under:

Copyright (c) 2013, Torti Andr?s Fernando All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions a...

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Java Source Code

package com.tjerkw.slideexpandable.library;
/*  w  w w .j  ava2  s.  c o m*/
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.LinearLayout;

/**
 * Animation that either expands or collapses a view by sliding it down to make it visible.
 * Or by sliding it up so it will hide. It will look like it slides behind the view above.
 *
 * @auther tjerk
 * @date 6/9/12 4:58 PM
 */
public class ExpandCollapseAnimation extends Animation {
  private View mAnimatedView;
  private int mEndHeight;
  private int mType;
  public final static int COLLAPSE = 1;
  public final static int EXPAND = 0;
  private LinearLayout.LayoutParams mLayoutParams;

  /**
   * Initializes expand collapse animation, has two types, collapse (1) and expand (0).
   * @param view The view to animate
   * @param type The type of animation: 0 will expand from gone and 0 size to visible and layout size defined in xml.
   * 1 will collapse view and set to gone
   */
  public ExpandCollapseAnimation(View view, int type) {

    mAnimatedView = view;
    mEndHeight = mAnimatedView.getMeasuredHeight();
    mLayoutParams = ((LinearLayout.LayoutParams) view.getLayoutParams());
    mType = type;
    if(mType == EXPAND) {

      mLayoutParams.bottomMargin = -mEndHeight;
    } else {

      mLayoutParams.bottomMargin = 0;
    }
    view.setVisibility(View.VISIBLE);
  }

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

    super.applyTransformation(interpolatedTime, t);
    if (interpolatedTime < 1.0f) {
      if(mType == EXPAND) {
        mLayoutParams.bottomMargin =  -mEndHeight + (int) (mEndHeight * interpolatedTime);
      } else {
        mLayoutParams.bottomMargin = - (int) (mEndHeight * interpolatedTime);
      }
      //Log.d("ExpandCollapseAnimation", "anim height " + mLayoutParams.bottomMargin);
      mAnimatedView.requestLayout();
    } else {
      if(mType == EXPAND) {
        mLayoutParams.bottomMargin = 0;
        mAnimatedView.requestLayout();
      } else {
        mLayoutParams.bottomMargin = -mEndHeight;
        mAnimatedView.setVisibility(View.GONE);
        mAnimatedView.requestLayout();
      }
    }
  }
}

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