get Expand View Animation - Android Animation

Android examples for Animation:Expand Animation

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Description

get Expand View Animation

Demo Code

/*// w ww  .ja v a 2s. c  o m
 * Copyright (C) 2016 Marco Hernaiz Cao
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;

import android.view.View;

import android.view.animation.Animation;

import android.view.animation.Transformation;

import android.widget.RelativeLayout;

public class Main {
    public static Animation getExpandViewAnimation(final View view,
            int duration) {

        view.measure(RelativeLayout.LayoutParams.MATCH_PARENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        final int targetHeight = view.getMeasuredHeight();

        view.getLayoutParams().height = 0;
        view.setVisibility(View.VISIBLE);
        Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime,
                    Transformation t) {
                view.getLayoutParams().height = interpolatedTime == 1 ? RelativeLayout.LayoutParams.WRAP_CONTENT
                        : (int) (targetHeight * interpolatedTime);
                view.requestLayout();
            }

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

        // 1dp/ms
        // animation.setDuration((int) (targetHeight /
        // view.getContext().getResources().getDisplayMetrics().density));
        animation.setDuration(duration);
        return animation;
    }
}

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