19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.view.animation; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * An animation that controls the alpha level of an object. 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Useful for fading things in and out. This animation ends up 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * changing the alpha property of a {@link Transformation} 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class AlphaAnimation extends Animation { 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mFromAlpha; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mToAlpha; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 34bdbdc4f92951200a88d4c754448b9f91626ffc04The Android Open Source Project * Constructor used when an AlphaAnimation is loaded from a resource. 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param context Application context to use 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param attrs Attribute set from which to read values 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AlphaAnimation(Context context, AttributeSet attrs) { 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs); 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.AlphaAnimation); 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFromAlpha = a.getFloat(com.android.internal.R.styleable.AlphaAnimation_fromAlpha, 1.0f); 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mToAlpha = a.getFloat(com.android.internal.R.styleable.AlphaAnimation_toAlpha, 1.0f); 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Constructor to use when building an AlphaAnimation from code 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fromAlpha Starting alpha value for the animation, where 1.0 means 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * fully opaque and 0.0 means fully transparent. 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param toAlpha Ending alpha value for the animation. 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AlphaAnimation(float fromAlpha, float toAlpha) { 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFromAlpha = fromAlpha; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mToAlpha = toAlpha; 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Changes the alpha property of the supplied {@link Transformation} 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void applyTransformation(float interpolatedTime, Transformation t) { 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final float alpha = mFromAlpha; 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project t.setAlpha(alpha + ((mToAlpha - alpha) * interpolatedTime)); 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean willChangeTransformationMatrix() { 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean willChangeBounds() { 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 81d4745a689f36211afaff396874d78b1d5202762dRomain Guy 82d4745a689f36211afaff396874d78b1d5202762dRomain Guy /** 83d4745a689f36211afaff396874d78b1d5202762dRomain Guy * @hide 84d4745a689f36211afaff396874d78b1d5202762dRomain Guy */ 85d4745a689f36211afaff396874d78b1d5202762dRomain Guy @Override 86d4745a689f36211afaff396874d78b1d5202762dRomain Guy public boolean hasAlpha() { 87d4745a689f36211afaff396874d78b1d5202762dRomain Guy return true; 88d4745a689f36211afaff396874d78b1d5202762dRomain Guy } 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 90