expand View via Animation - Android User Interface

Android examples for User Interface:View Scale

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Description

expand View via Animation

Demo Code


//package com.java2s;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.Transformation;

public class Main {
    public static final long DEFAULT_DURATION = 300;

    public static void expandView(final View v) {
        expandView(v, DEFAULT_DURATION);
    }/*ww  w. j ava  2s. c  o  m*/

    public static void expandView(final View v, long duration) {
        v.measure(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
        final int targetHeight = v.getMeasuredHeight();

        v.setPivotY(0);
        v.setScaleY(0);
        v.getLayoutParams().height = 0;
        v.setVisibility(View.VISIBLE);
        Animation a = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime,
                    Transformation t) {
                v.getLayoutParams().height = /*interpolatedTime == 1 ? ViewGroup.LayoutParams.WRAP_CONTENT
                                             :*/(int) (targetHeight * interpolatedTime);
                v.setScaleY(interpolatedTime);
                v.requestLayout();
            }

            @Override
            public boolean willChangeBounds() {
                return true;
            }
        };

        a.setDuration(duration);
        v.startAnimation(a);
    }
}

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