1 /* 2 * Copyright (C) 2015 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.android.tv.ui; 18 19 import android.animation.Animator; 20 import android.animation.ValueAnimator; 21 import android.util.Log; 22 import android.view.View; 23 import android.view.ViewGroup.LayoutParams; 24 25 import java.lang.reflect.InvocationTargetException; 26 import java.lang.reflect.Method; 27 28 /** 29 * A class that includes convenience methods for view classes. 30 */ 31 public class ViewUtils { 32 private static final String TAG = "ViewUtils"; 33 ViewUtils()34 private ViewUtils() { 35 // Prevent instantiation. 36 } 37 setTransitionAlpha(View v, float alpha)38 public static void setTransitionAlpha(View v, float alpha) { 39 Method method; 40 try { 41 method = View.class.getDeclaredMethod("setTransitionAlpha", Float.TYPE); 42 method.invoke(v, alpha); 43 } catch (NoSuchMethodException|IllegalAccessException|IllegalArgumentException 44 |InvocationTargetException e) { 45 Log.e(TAG, "Fail to call View.setTransitionAlpha", e); 46 } 47 } 48 49 /** 50 * Creates an animator in view's height 51 * @param target the {@link view} animator performs on. 52 */ createHeightAnimator( final View target, int initialHeight, int targetHeight)53 public static Animator createHeightAnimator( 54 final View target, int initialHeight, int targetHeight) { 55 ValueAnimator animator = ValueAnimator.ofInt(initialHeight, targetHeight); 56 animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 57 @Override 58 public void onAnimationUpdate(ValueAnimator animation) { 59 int value = (Integer) animation.getAnimatedValue(); 60 if (value == 0) { 61 if (target.getVisibility() != View.GONE) { 62 target.setVisibility(View.GONE); 63 } 64 } else { 65 if (target.getVisibility() != View.VISIBLE) { 66 target.setVisibility(View.VISIBLE); 67 } 68 setLayoutHeight(target, value); 69 } 70 } 71 }); 72 return animator; 73 } 74 75 /** 76 * Gets view's layout height. 77 */ getLayoutHeight(View view)78 public static int getLayoutHeight(View view) { 79 LayoutParams layoutParams = view.getLayoutParams(); 80 return layoutParams.height; 81 } 82 83 /** 84 * Sets view's layout height. 85 */ setLayoutHeight(View view, int height)86 public static void setLayoutHeight(View view, int height) { 87 LayoutParams layoutParams = view.getLayoutParams(); 88 if (height != layoutParams.height) { 89 layoutParams.height = height; 90 view.setLayoutParams(layoutParams); 91 } 92 } 93 }