1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.apis.graphics; 18 19 import android.animation.Animator; 20 import android.animation.AnimatorSet; 21 import android.animation.ObjectAnimator; 22 import android.app.Activity; 23 import android.os.Bundle; 24 import android.view.ViewGroup; 25 import android.widget.TextView; 26 27 import com.example.android.apis.R; 28 29 import java.util.ArrayList; 30 31 public class ShadowCardStack extends Activity { 32 33 private static final float X_SHIFT_DP = 1000; 34 private static final float Y_SHIFT_DP = 50; 35 private static final float Z_LIFT_DP = 8; 36 private static final float ROTATE_DEGREES = 15; 37 createSet(ArrayList<Animator> items, long startDelay)38 public AnimatorSet createSet(ArrayList<Animator> items, long startDelay) { 39 AnimatorSet set = new AnimatorSet(); 40 set.playTogether(items); 41 set.setStartDelay(startDelay); 42 return set; 43 } 44 45 @Override onCreate(Bundle savedInstanceState)46 protected void onCreate(Bundle savedInstanceState) { 47 super.onCreate(savedInstanceState); 48 setContentView(R.layout.shadow_card_stack); 49 50 float density = getResources().getDisplayMetrics().density; 51 52 final ViewGroup cardParent = (ViewGroup) findViewById(R.id.card_parent); 53 54 final float X = X_SHIFT_DP * density; 55 final float Y = Y_SHIFT_DP * density; 56 final float Z = Z_LIFT_DP * density; 57 58 ArrayList<Animator> towardAnimators = new ArrayList<Animator>(); 59 ArrayList<Animator> expandAnimators = new ArrayList<Animator>(); 60 ArrayList<Animator> moveAwayAnimators = new ArrayList<Animator>(); 61 ArrayList<Animator> moveBackAnimators = new ArrayList<Animator>(); 62 ArrayList<Animator> awayAnimators = new ArrayList<Animator>(); 63 ArrayList<Animator> collapseAnimators = new ArrayList<Animator>(); 64 65 final int max = cardParent.getChildCount(); 66 for (int i = 0; i < max; i++) { 67 TextView card = (TextView) cardParent.getChildAt(i); 68 card.setText("Card number " + i); 69 70 float targetY = (i - (max-1) / 2.0f) * Y; 71 Animator expand = ObjectAnimator.ofFloat(card, "translationY", targetY); 72 expandAnimators.add(expand); 73 74 Animator toward = ObjectAnimator.ofFloat(card, "translationZ", i * Z); 75 toward.setStartDelay(200 * ((max) - i)); 76 towardAnimators.add(toward); 77 78 card.setPivotX(X_SHIFT_DP); 79 Animator rotateAway = ObjectAnimator.ofFloat(card, "rotationY", 80 i == 0 ? 0 : ROTATE_DEGREES); 81 rotateAway.setStartDelay(200 * ((max) - i)); 82 rotateAway.setDuration(100); 83 moveAwayAnimators.add(rotateAway); 84 Animator slideAway = ObjectAnimator.ofFloat(card, "translationX", 85 i == 0 ? 0 : X); 86 slideAway.setStartDelay(200 * ((max) - i)); 87 slideAway.setDuration(100); 88 moveAwayAnimators.add(slideAway); 89 90 Animator rotateBack = ObjectAnimator.ofFloat(card, "rotationY", 0); 91 rotateBack.setStartDelay(200 * i); 92 moveBackAnimators.add(rotateBack); 93 Animator slideBack = ObjectAnimator.ofFloat(card, "translationX", 0); 94 slideBack.setStartDelay(200 * i); 95 moveBackAnimators.add(slideBack); 96 97 Animator away = ObjectAnimator.ofFloat(card, "translationZ", 0); 98 away.setStartDelay(200 * i); 99 awayAnimators.add(away); 100 101 Animator collapse = ObjectAnimator.ofFloat(card, "translationY", 0); 102 collapseAnimators.add(collapse); 103 } 104 105 AnimatorSet totalSet = new AnimatorSet(); 106 totalSet.playSequentially( 107 createSet(expandAnimators, 250), 108 createSet(towardAnimators, 0), 109 110 createSet(moveAwayAnimators, 250), 111 createSet(moveBackAnimators, 0), 112 113 createSet(awayAnimators, 250), 114 createSet(collapseAnimators, 0)); 115 totalSet.start(); 116 totalSet.addListener(new RepeatListener(totalSet)); 117 } 118 119 public static class RepeatListener implements Animator.AnimatorListener { 120 final Animator mRepeatAnimator; RepeatListener(Animator repeatAnimator)121 public RepeatListener(Animator repeatAnimator) { 122 mRepeatAnimator = repeatAnimator; 123 } 124 125 @Override onAnimationStart(Animator animation)126 public void onAnimationStart(Animator animation) {} 127 128 @Override onAnimationEnd(Animator animation)129 public void onAnimationEnd(Animator animation) { 130 if (animation == mRepeatAnimator) { 131 mRepeatAnimator.start(); 132 } 133 } 134 135 @Override onAnimationCancel(Animator animation)136 public void onAnimationCancel(Animator animation) {} 137 138 @Override onAnimationRepeat(Animator animation)139 public void onAnimationRepeat(Animator animation) {} 140 } 141 } 142