Tony Huang | 4d179b7 | 2019-08-15 14:25:10 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 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.documentsui; |
| 18 | |
| 19 | import static com.android.documentsui.base.SharedMinimal.DEBUG; |
| 20 | import static com.android.documentsui.base.SharedMinimal.TAG; |
| 21 | |
| 22 | import android.database.ContentObserver; |
| 23 | import android.os.Handler; |
| 24 | import android.os.Looper; |
| 25 | import android.util.Log; |
| 26 | |
| 27 | /** |
| 28 | * A custom {@link ContentObserver} which constructed by a {@link ContentLock} |
| 29 | * and a {@link Runnable} callback. It will callback when it's onChange and ContentLock is unlock. |
| 30 | */ |
| 31 | public final class LockingContentObserver extends ContentObserver { |
| 32 | private final ContentLock mLock; |
| 33 | private final Runnable mContentChangedCallback; |
| 34 | |
| 35 | public LockingContentObserver(ContentLock lock, Runnable contentChangedCallback) { |
| 36 | super(new Handler(Looper.getMainLooper())); |
| 37 | mLock = lock; |
| 38 | mContentChangedCallback = contentChangedCallback; |
| 39 | } |
| 40 | |
| 41 | @Override |
| 42 | public boolean deliverSelfNotifications() { |
| 43 | return true; |
| 44 | } |
| 45 | |
| 46 | @Override |
| 47 | public void onChange(boolean selfChange) { |
| 48 | if (DEBUG) { |
| 49 | Log.d(TAG, "Content updated."); |
| 50 | } |
| 51 | mLock.runWhenUnlocked(mContentChangedCallback); |
| 52 | } |
| 53 | } |