Juan Lang | 5efe8f0 | 2017-05-04 16:59:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | package com.android.settingslib.utils; |
| 17 | |
| 18 | import android.os.Looper; |
| 19 | |
| 20 | public class ThreadUtils { |
| 21 | private static volatile Thread sMainThread; |
| 22 | |
| 23 | /** |
| 24 | * Returns true if the current thread is the UI thread. |
| 25 | */ |
| 26 | public static boolean isMainThread() { |
| 27 | if (sMainThread == null) { |
| 28 | sMainThread = Looper.getMainLooper().getThread(); |
| 29 | } |
| 30 | return Thread.currentThread() == sMainThread; |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * Checks that the current thread is the UI thread. Otherwise throws an exception. |
| 35 | */ |
| 36 | public static void ensureMainThread() { |
| 37 | if (!isMainThread()) { |
| 38 | throw new RuntimeException("Must be called on the UI thread"); |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | } |