| /* |
| * 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.android.settingslib.utils; |
| |
| import android.os.Handler; |
| import android.os.Looper; |
| |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| |
| public class ThreadUtils { |
| |
| private static volatile Thread sMainThread; |
| private static volatile Handler sMainThreadHandler; |
| private static volatile ExecutorService sSingleThreadExecutor; |
| |
| /** |
| * Returns true if the current thread is the UI thread. |
| */ |
| public static boolean isMainThread() { |
| if (sMainThread == null) { |
| sMainThread = Looper.getMainLooper().getThread(); |
| } |
| return Thread.currentThread() == sMainThread; |
| } |
| |
| /** |
| * Returns a shared UI thread handler. |
| */ |
| public static Handler getUiThreadHandler() { |
| if (sMainThreadHandler == null) { |
| sMainThreadHandler = new Handler(Looper.getMainLooper()); |
| } |
| |
| return sMainThreadHandler; |
| } |
| |
| /** |
| * Checks that the current thread is the UI thread. Otherwise throws an exception. |
| */ |
| public static void ensureMainThread() { |
| if (!isMainThread()) { |
| throw new RuntimeException("Must be called on the UI thread"); |
| } |
| } |
| |
| /** |
| * Posts runnable in background using shared background thread pool. |
| */ |
| public static void postOnBackgroundThread(Runnable runnable) { |
| if (sSingleThreadExecutor == null) { |
| sSingleThreadExecutor = Executors.newSingleThreadExecutor(); |
| } |
| sSingleThreadExecutor.execute(runnable); |
| } |
| |
| /** |
| * Posts the runnable on the main thread. |
| */ |
| public static void postOnMainThread(Runnable runnable) { |
| getUiThreadHandler().post(runnable); |
| } |
| |
| } |