| /* |
| * Copyright (C) 2018 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.packageinstaller; |
| |
| import android.os.AsyncTask; |
| |
| import androidx.annotation.WorkerThread; |
| import androidx.lifecycle.LiveData; |
| |
| /** |
| * {@link LiveData} that uses {@link AsyncTask} to load value on a background thread. |
| * |
| * @param <T> type of the value |
| */ |
| public abstract class AsyncTaskLiveData<T> extends LiveData<T> { |
| |
| /** |
| * Load the value on a background thread. The value will be reloaded even if already loaded. |
| */ |
| public void loadValue() { |
| AsyncTask.execute(() -> postValue(loadValueInBackground())); |
| } |
| |
| @WorkerThread |
| protected abstract T loadValueInBackground(); |
| } |