| /* |
| * Copyright (C) 2016 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 com.example.android.supportv7.widget; |
| |
| import android.support.v7.widget.LinearLayoutManager; |
| import android.support.v7.widget.RecyclerView; |
| import android.view.ViewGroup; |
| |
| import com.example.android.supportv7.Cheeses; |
| import com.example.android.supportv7.R; |
| import com.example.android.supportv7.widget.adapter.SimpleStringAdapter; |
| import com.example.android.supportv7.widget.util.ConfigToggle; |
| |
| /** |
| * A configurably janky activity that uses {@link LinearLayoutManager}. |
| */ |
| public class LinearLayoutManagerJankActivity extends LinearLayoutManagerActivity { |
| |
| private boolean mBindSlowdownEnabled = true; |
| private boolean mInflateSlowdownEnabled = true; |
| |
| /** |
| * Spin wait. Used instead of sleeping so a core is used up for the duration, and so |
| * traces/sampled profiling show the sections as expensive, and not just a scheduling mistake. |
| */ |
| private static void spinWaitMs(long ms) { |
| long start = System.nanoTime(); |
| while (System.nanoTime() - start < ms * 1000L * 1000L); |
| } |
| |
| @Override |
| protected RecyclerView.Adapter createAdapter() { |
| return new SimpleStringAdapter(this, Cheeses.sCheeseStrings) { |
| @Override |
| public void onBindViewHolder(ViewHolder holder, int position) { |
| super.onBindViewHolder(holder, position); |
| if (mBindSlowdownEnabled) spinWaitMs(8); |
| } |
| |
| @Override |
| public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { |
| if (mInflateSlowdownEnabled) spinWaitMs(4); |
| return super.onCreateViewHolder(parent, viewType); |
| } |
| }; |
| } |
| |
| @Override |
| protected ConfigToggle[] createConfigToggles() { |
| return new ConfigToggle[]{ |
| new ConfigToggle(this, R.string.enable_bind_slowdown) { |
| @Override |
| public boolean isChecked() { return mBindSlowdownEnabled; } |
| |
| @Override |
| public void onChange(boolean newValue) { mBindSlowdownEnabled = newValue; } |
| }, |
| new ConfigToggle(this, R.string.enable_inflate_slowdown) { |
| @Override |
| public boolean isChecked() { return mInflateSlowdownEnabled; } |
| |
| @Override |
| public void onChange(boolean newValue) { mInflateSlowdownEnabled = newValue; } |
| }, |
| new ConfigToggle(this, R.string.enable_prefetch) { |
| @Override |
| public boolean isChecked() { return mLayoutManager.isItemPrefetchEnabled(); } |
| |
| @Override |
| public void onChange(boolean newValue) { |
| mLayoutManager.setItemPrefetchEnabled(newValue); |
| } |
| }, |
| }; |
| } |
| } |