--- /dev/null
+/*
+ * Copyright (C) 2008 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 android.view.animation.cts;
+
+import com.android.cts.stub.R;
+
+import dalvik.annotation.TestLevel;
+import dalvik.annotation.TestTargetClass;
+import dalvik.annotation.TestTargetNew;
+import dalvik.annotation.TestTargets;
+
+import android.app.Activity;
+import android.content.res.XmlResourceParser;
+import android.test.ActivityInstrumentationTestCase2;
+import android.util.AttributeSet;
+import android.util.Xml;
+import android.view.View;
+import android.view.animation.AccelerateDecelerateInterpolator;
+import android.view.animation.AlphaAnimation;
+import android.view.animation.Animation;
+import android.view.animation.AnimationUtils;
+import android.view.animation.Interpolator;
+import android.view.animation.Transformation;
+
+@TestTargetClass(AccelerateDecelerateInterpolator.class)
+public class AccelerateDecelerateInterpolatorTest
+ extends ActivityInstrumentationTestCase2<AnimationTestStubActivity> {
+
+ private Activity mActivity;
+ private static final float ALPHA_DELTA = 0.001f;
+ /** It is defined in R.anim.accelarate_decelerate_alpha */
+ private static final long ALPHA_DURATION = 2000;
+
+ public AccelerateDecelerateInterpolatorTest() {
+ super("com.android.cts.stub", AnimationTestStubActivity.class);
+ }
+
+ @Override
+ protected void setUp() throws Exception {
+ super.setUp();
+ mActivity = getActivity();
+ }
+
+ @TestTargets({
+ @TestTargetNew(
+ level = TestLevel.COMPLETE,
+ method = "AccelerateDecelerateInterpolator",
+ args = {}
+ ),
+ @TestTargetNew(
+ level = TestLevel.COMPLETE,
+ method = "AccelerateDecelerateInterpolator",
+ args = {android.content.Context.class, android.util.AttributeSet.class}
+ )
+ })
+ public void testConstructor() {
+ new AccelerateDecelerateInterpolator();
+
+ XmlResourceParser parser = mActivity.getResources().getAnimation(
+ R.anim.accelerate_decelerate_alpha);
+ AttributeSet attrs = Xml.asAttributeSet(parser);
+ new AccelerateDecelerateInterpolator(mActivity, attrs);
+ }
+
+ @TestTargetNew(
+ level = TestLevel.COMPLETE,
+ notes = "Test case will accelerate then decelerate AlphaAnimation. It will change"
+ + " alpha from 0.0 to 1.0, the rate of changing alpha starts out slowly, then"
+ + " accelerates to the middle, and then decelerates to the end",
+ method = "getInterpolation",
+ args = {float.class}
+ )
+ public void testAccelerateDecelerateInterpolator() {
+ final View animWindow = mActivity.findViewById(R.id.anim_window);
+
+ // XML file of R.anim.accelerate_decelerate_alpha
+ // <alpha xmlns:android="http://schemas.android.com/apk/res/android"
+ // android:interpolator="@android:anim/accelerate_decelerate_interpolator"
+ // android:fromAlpha="0.0"
+ // android:toAlpha="1.0"
+ // android:duration="2000" />
+ final Animation anim = AnimationUtils.loadAnimation(mActivity,
+ R.anim.accelerate_decelerate_alpha);
+ assertEquals(ALPHA_DURATION, anim.getDuration());
+ assertTrue(anim instanceof AlphaAnimation);
+ assertFalse(anim.hasStarted());
+
+ AnimationTestUtils.assertRunAnimation(getInstrumentation(), animWindow, anim);
+
+ Transformation transformation = new Transformation();
+ long startTime = anim.getStartTime();
+ anim.getTransformation(startTime, transformation);
+ float alpha1 = transformation.getAlpha();
+ assertEquals(0.0f, alpha1, ALPHA_DELTA);
+
+ anim.getTransformation(startTime + 500, transformation);
+ float alpha2 = transformation.getAlpha();
+
+ anim.getTransformation(startTime + 1000, transformation);
+ float alpha3 = transformation.getAlpha();
+
+ anim.getTransformation(startTime + 1500, transformation);
+ float alpha4 = transformation.getAlpha();
+
+ anim.getTransformation(startTime + ALPHA_DURATION, transformation);
+ float alpha5 = transformation.getAlpha();
+ assertEquals(1.0f, alpha5, ALPHA_DELTA);
+
+ // check accelerating and decelerating delta alpha
+ // starts and ends slowly, accelerates through middle
+ float delta1 = alpha2 - alpha1;
+ float delta2 = alpha3 - alpha2;
+ float delta3 = alpha4 - alpha3;
+ float delta4 = alpha5 - alpha4;
+ assertTrue(delta1 < delta2);
+ assertTrue(delta3 > delta4);
+ }
+
+ @TestTargetNew(
+ level = TestLevel.COMPLETE,
+ notes = "Test getInterpolation(float), call it directly.",
+ method = "getInterpolation",
+ args = {float.class}
+ )
+ public void testGetInterpolation() {
+ Interpolator interpolator = new AccelerateDecelerateInterpolator();
+
+ float alpha1 = interpolator.getInterpolation(0f);
+ float alpha2 = interpolator.getInterpolation(0.25f);
+ float alpha3 = interpolator.getInterpolation(0.5f);
+ float alpha4 = interpolator.getInterpolation(0.75f);
+ float alpha5 = interpolator.getInterpolation(1f);
+ // check accelerating and decelerating delta alpha
+ // starts and ends slowly, accelerates through middle
+ float delta1 = alpha2 - alpha1;
+ float delta2 = alpha3 - alpha2;
+ float delta3 = alpha4 - alpha3;
+ float delta4 = alpha5 - alpha4;
+ assertTrue(delta1 < delta2);
+ assertTrue(delta3 > delta4);
+ }
+}
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