1 /* 2 * Copyright (C) 2009 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 android.view.animation.cts; 18 19 import com.android.cts.view.R; 20 21 22 import android.app.Activity; 23 import android.content.res.XmlResourceParser; 24 import android.test.ActivityInstrumentationTestCase2; 25 import android.util.AttributeSet; 26 import android.util.Xml; 27 import android.view.View; 28 import android.view.animation.AlphaAnimation; 29 import android.view.animation.Animation; 30 import android.view.animation.AnimationUtils; 31 import android.view.animation.DecelerateInterpolator; 32 import android.view.animation.Interpolator; 33 import android.view.animation.Transformation; 34 35 /** 36 * Test {@link DecelerateInterpolator}. 37 */ 38 public class DecelerateInterpolatorTest 39 extends ActivityInstrumentationTestCase2<AnimationTestCtsActivity> { 40 41 private Activity mActivity; 42 private static final float ALPHA_DELTA = 0.001f; 43 44 /** It is defined in R.anim.decelerate_alpha */ 45 private static final long DECELERATE_ALPHA_DURATION = 2000; 46 47 public DecelerateInterpolatorTest() { 48 super("com.android.cts.view", AnimationTestCtsActivity.class); 49 } 50 51 @Override 52 protected void setUp() throws Exception { 53 super.setUp(); 54 mActivity = getActivity(); 55 } 56 57 public void testConstructor() { 58 new DecelerateInterpolator(); 59 60 new DecelerateInterpolator(1.0f); 61 62 XmlResourceParser parser = mActivity.getResources().getAnimation(R.anim.decelerate_alpha); 63 AttributeSet attrs = Xml.asAttributeSet(parser); 64 new DecelerateInterpolator(mActivity, attrs); 65 } 66 67 public void testDecelerateInterpolator() { 68 final View animWindow = mActivity.findViewById(R.id.anim_window); 69 70 // XML file of R.anim.decelerate_alpha 71 // <alpha xmlns:android="http://schemas.android.com/apk/res/android" 72 // android:interpolator="@android:anim/decelerate_interpolator" 73 // android:fromAlpha="0.0" 74 // android:toAlpha="1.0" 75 // android:duration="2000" /> 76 final Animation anim = AnimationUtils.loadAnimation(mActivity, R.anim.decelerate_alpha); 77 78 assertEquals(DECELERATE_ALPHA_DURATION, anim.getDuration()); 79 assertTrue(anim instanceof AlphaAnimation); 80 81 // factor is 1.0f 82 Interpolator interpolator = new DecelerateInterpolator(1.0f); 83 anim.setInterpolator(interpolator); 84 assertFalse(anim.hasStarted()); 85 86 AnimationTestUtils.assertRunAnimation(getInstrumentation(), animWindow, anim); 87 88 Transformation transformation = new Transformation(); 89 long startTime = anim.getStartTime(); 90 anim.getTransformation(startTime, transformation); 91 float alpha1 = transformation.getAlpha(); 92 assertEquals(0.0f, alpha1, ALPHA_DELTA); 93 94 anim.getTransformation(startTime + 500, transformation); 95 float alpha2 = transformation.getAlpha(); 96 97 anim.getTransformation(startTime + 1000, transformation); 98 float alpha3 = transformation.getAlpha(); 99 100 anim.getTransformation(startTime + 1500, transformation); 101 float alpha4 = transformation.getAlpha(); 102 103 anim.getTransformation(startTime + DECELERATE_ALPHA_DURATION, transformation); 104 float alpha5 = transformation.getAlpha(); 105 assertEquals(1.0f, alpha5, ALPHA_DELTA); 106 107 // check decelerating delta alpha 108 float delta1 = alpha2 - alpha1; 109 float delta2 = alpha3 - alpha2; 110 float delta3 = alpha4 - alpha3; 111 float delta4 = alpha5 - alpha4; 112 assertTrue(delta1 > delta2); 113 assertTrue(delta2 > delta3); 114 assertTrue(delta3 > delta4); 115 116 // factor is 1.5f, it starts even faster and ends evens slower than 1.0f 117 interpolator = new DecelerateInterpolator(1.5f); 118 anim.setInterpolator(interpolator); 119 120 AnimationTestUtils.assertRunAnimation(getInstrumentation(), animWindow, anim); 121 122 transformation = new Transformation(); 123 startTime = anim.getStartTime(); 124 anim.getTransformation(startTime, transformation); 125 float alpha6 = transformation.getAlpha(); 126 assertEquals(0.0f, alpha1, ALPHA_DELTA); 127 128 anim.getTransformation(startTime + 500, transformation); 129 float alpha7 = transformation.getAlpha(); 130 131 anim.getTransformation(startTime + 1000, transformation); 132 float alpha8 = transformation.getAlpha(); 133 134 anim.getTransformation(startTime + 1500, transformation); 135 float alpha9 = transformation.getAlpha(); 136 137 anim.getTransformation(startTime + DECELERATE_ALPHA_DURATION, transformation); 138 float alpha10 = transformation.getAlpha(); 139 assertEquals(1.0f, alpha5, ALPHA_DELTA); 140 141 // check decelerating delta alpha 142 float delta5 = alpha7 - alpha6; 143 float delta6 = alpha8 - alpha7; 144 float delta7 = alpha9 - alpha8; 145 float delta8 = alpha10 - alpha9; 146 assertTrue(delta5 > delta6); 147 assertTrue(delta6 > delta7); 148 assertTrue(delta7 > delta8); 149 150 // check whether it starts even faster 151 assertTrue(delta5 > delta1); 152 } 153 154 public void testGetInterpolation() { 155 final float input = 0.25f; 156 Interpolator interpolator1 = new DecelerateInterpolator(1.0f); 157 // factor is 2.0f, it starts even faster and ends evens slower than 1.0f 158 Interpolator interpolator2 = new DecelerateInterpolator(2.0f); 159 160 float delta1 = interpolator1.getInterpolation(input); 161 float delta2 = interpolator2.getInterpolation(input); 162 163 // check whether it starts even faster 164 assertTrue(delta2 > delta1); 165 } 166 } 167
