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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.example.android.apis.graphics;
import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.android.apis.R;
import java.util.ArrayList;
public class ShadowCardStack extends Activity {
private static final float X_SHIFT_DP = 1000;
private static final float Y_SHIFT_DP = 50;
private static final float Z_LIFT_DP = 8;
private static final float ROTATE_DEGREES = 15;
public AnimatorSet createSet(ArrayList<Animator> items, long startDelay) {
AnimatorSet set = new AnimatorSet();
set.playTogether(items);
set.setStartDelay(startDelay);
return set;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.shadow_card_stack);
float density = getResources().getDisplayMetrics().density;
final ViewGroup cardParent = (ViewGroup) findViewById(R.id.card_parent);
final float X = X_SHIFT_DP * density;
final float Y = Y_SHIFT_DP * density;
final float Z = Z_LIFT_DP * density;
ArrayList<Animator> towardAnimators = new ArrayList<Animator>();
ArrayList<Animator> expandAnimators = new ArrayList<Animator>();
ArrayList<Animator> moveAwayAnimators = new ArrayList<Animator>();
ArrayList<Animator> moveBackAnimators = new ArrayList<Animator>();
ArrayList<Animator> awayAnimators = new ArrayList<Animator>();
ArrayList<Animator> collapseAnimators = new ArrayList<Animator>();
final int max = cardParent.getChildCount();
for (int i = 0; i < max; i++) {
TextView card = (TextView) cardParent.getChildAt(i);
card.setText("Card number " + i);
float targetY = (i - (max-1) / 2.0f) * Y;
Animator expand = ObjectAnimator.ofFloat(card, "translationY", targetY);
expandAnimators.add(expand);
Animator toward = ObjectAnimator.ofFloat(card, "translationZ", i * Z);
toward.setStartDelay(200 * ((max) - i));
towardAnimators.add(toward);
card.setPivotX(X_SHIFT_DP);
Animator rotateAway = ObjectAnimator.ofFloat(card, "rotationY",
i == 0 ? 0 : ROTATE_DEGREES);
rotateAway.setStartDelay(200 * ((max) - i));
rotateAway.setDuration(100);
moveAwayAnimators.add(rotateAway);
Animator slideAway = ObjectAnimator.ofFloat(card, "translationX",
i == 0 ? 0 : X);
slideAway.setStartDelay(200 * ((max) - i));
slideAway.setDuration(100);
moveAwayAnimators.add(slideAway);
Animator rotateBack = ObjectAnimator.ofFloat(card, "rotationY", 0);
rotateBack.setStartDelay(200 * i);
moveBackAnimators.add(rotateBack);
Animator slideBack = ObjectAnimator.ofFloat(card, "translationX", 0);
slideBack.setStartDelay(200 * i);
moveBackAnimators.add(slideBack);
Animator away = ObjectAnimator.ofFloat(card, "translationZ", 0);
away.setStartDelay(200 * i);
awayAnimators.add(away);
Animator collapse = ObjectAnimator.ofFloat(card, "translationY", 0);
collapseAnimators.add(collapse);
}
AnimatorSet totalSet = new AnimatorSet();
totalSet.playSequentially(
createSet(expandAnimators, 250),
createSet(towardAnimators, 0),
createSet(moveAwayAnimators, 250),
createSet(moveBackAnimators, 0),
createSet(awayAnimators, 250),
createSet(collapseAnimators, 0));
totalSet.start();
totalSet.addListener(new RepeatListener(totalSet));
}
public static class RepeatListener implements Animator.AnimatorListener {
final Animator mRepeatAnimator;
public RepeatListener(Animator repeatAnimator) {
mRepeatAnimator = repeatAnimator;
}
@Override
public void onAnimationStart(Animator animation) {}
@Override
public void onAnimationEnd(Animator animation) {
if (animation == mRepeatAnimator) {
mRepeatAnimator.start();
}
}
@Override
public void onAnimationCancel(Animator animation) {}
@Override
public void onAnimationRepeat(Animator animation) {}
}
}
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