18d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn/* 28d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Copyright (C) 2013 The Android Open Source Project 38d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * 48d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Licensed under the Apache License, Version 2.0 (the "License"); 58d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * you may not use this file except in compliance with the License. 68d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * You may obtain a copy of the License at 78d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * 88d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * http://www.apache.org/licenses/LICENSE-2.0 98d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * 108d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Unless required by applicable law or agreed to in writing, software 118d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * distributed under the License is distributed on an "AS IS" BASIS, 128d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 138d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * See the License for the specific language governing permissions and 148d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * limitations under the License. 158d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn */ 168d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 178d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornpackage com.android.server; 188d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 198d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornimport android.os.Handler; 208d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornimport android.os.HandlerThread; 218d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornimport android.os.StrictMode; 228d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornimport android.util.Slog; 238d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 248d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn/** 258d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Shared singleton thread for showing UI. This is a foreground thread, and in 268d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * additional should not have operations that can take more than a few ms scheduled 278d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * on it to avoid UI jank. 288d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn */ 298d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornpublic final class UiThread extends HandlerThread { 308d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private static UiThread sInstance; 318d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private static Handler sHandler; 328d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 338d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private UiThread() { 348d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn super("android.ui", android.os.Process.THREAD_PRIORITY_FOREGROUND); 358d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 368d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 378d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private static void ensureThreadLocked() { 388d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn if (sInstance == null) { 398d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn sInstance = new UiThread(); 408d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn sInstance.start(); 418d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn sHandler = new Handler(sInstance.getLooper()); 428d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn sHandler.post(new Runnable() { 438d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn @Override 448d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn public void run() { 458d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn //Looper.myLooper().setMessageLogging(new LogPrinter( 468d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn // Log.VERBOSE, "WindowManagerPolicy", Log.LOG_ID_SYSTEM)); 478d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn android.os.Process.setCanSelfBackground(false); 488d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 498d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn // For debug builds, log event loop stalls to dropbox for analysis. 508d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn if (StrictMode.conditionallyEnableDebugLogging()) { 518d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn Slog.i("UiThread", "Enabled StrictMode logging for UI thread"); 528d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 538d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 548d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn }); 558d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 568d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 578d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 588d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn public static UiThread get() { 598d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn synchronized (UiThread.class) { 608d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn ensureThreadLocked(); 618d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn return sInstance; 628d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 638d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 648d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 658d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn public static Handler getHandler() { 668d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn synchronized (UiThread.class) { 678d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn ensureThreadLocked(); 688d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn return sHandler; 698d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 708d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 718d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn} 72