1 /*
2  * Copyright (C) 2018 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.dialer.metrics.jank;
18 
19 import android.support.v7.widget.RecyclerView;
20 import android.support.v7.widget.RecyclerView.OnScrollListener;
21 import com.android.dialer.metrics.Metrics;
22 
23 /** Logs jank for {@link RecyclerView} scrolling events. */
24 public final class RecyclerViewJankLogger extends OnScrollListener {
25 
26   private final Metrics metrics;
27   private final String eventName;
28 
29   private boolean isScrolling;
30 
RecyclerViewJankLogger(Metrics metrics, String eventName)31   public RecyclerViewJankLogger(Metrics metrics, String eventName) {
32     this.metrics = metrics;
33     this.eventName = eventName;
34   }
35 
36   @Override
onScrollStateChanged(RecyclerView recyclerView, int newState)37   public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
38     if (!isScrolling && newState == RecyclerView.SCROLL_STATE_DRAGGING) {
39       isScrolling = true;
40       metrics.startJankRecorder(eventName);
41     } else if (isScrolling && newState == RecyclerView.SCROLL_STATE_IDLE) {
42       isScrolling = false;
43       metrics.stopJankRecorder(eventName);
44     }
45   }
46 }
47