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 android.view; 18 19 import android.os.Parcel; 20 import android.os.Parcelable; 21 22 /** 23 * This class contains window animation frame statistics. For example, a window 24 * animation is usually performed when the application is transitioning from one 25 * activity to another. The frame statistics are a snapshot for the time interval 26 * from {@link #getStartTimeNano()} to {@link #getEndTimeNano()}. 27 * <p> 28 * The key idea is that in order to provide a smooth user experience the system should 29 * run window animations at a specific time interval obtained by calling {@link 30 * #getRefreshPeriodNano()}. If the system does not render a frame every refresh 31 * period the user will see irregular window transitions. The time when the frame was 32 * actually presented on the display by calling {@link #getFramePresentedTimeNano(int)}. 33 */ 34 public final class WindowAnimationFrameStats extends FrameStats implements Parcelable { 35 /** 36 * @hide 37 */ 38 public WindowAnimationFrameStats() { 39 /* do nothing */ 40 } 41 42 /** 43 * Initializes this isntance. 44 * 45 * @param refreshPeriodNano The display refresh period. 46 * @param framesPresentedTimeNano The presented frame times. 47 * 48 * @hide 49 */ 50 public void init(long refreshPeriodNano, long[] framesPresentedTimeNano) { 51 mRefreshPeriodNano = refreshPeriodNano; 52 mFramesPresentedTimeNano = framesPresentedTimeNano; 53 } 54 55 private WindowAnimationFrameStats(Parcel parcel) { 56 mRefreshPeriodNano = parcel.readLong(); 57 mFramesPresentedTimeNano = parcel.createLongArray(); 58 } 59 60 @Override 61 public int describeContents() { 62 return 0; 63 } 64 65 @Override 66 public void writeToParcel(Parcel parcel, int flags) { 67 parcel.writeLong(mRefreshPeriodNano); 68 parcel.writeLongArray(mFramesPresentedTimeNano); 69 } 70 71 @Override 72 public String toString() { 73 StringBuilder builder = new StringBuilder(); 74 builder.append("WindowAnimationFrameStats["); 75 builder.append("frameCount:" + getFrameCount()); 76 builder.append(", fromTimeNano:" + getStartTimeNano()); 77 builder.append(", toTimeNano:" + getEndTimeNano()); 78 builder.append(']'); 79 return builder.toString(); 80 } 81 82 public static final Creator<WindowAnimationFrameStats> CREATOR = 83 new Creator<WindowAnimationFrameStats>() { 84 @Override 85 public WindowAnimationFrameStats createFromParcel(Parcel parcel) { 86 return new WindowAnimationFrameStats(parcel); 87 } 88 89 @Override 90 public WindowAnimationFrameStats[] newArray(int size) { 91 return new WindowAnimationFrameStats[size]; 92 } 93 }; 94 } 95
