67 lines
2.0 KiB
Java
67 lines
2.0 KiB
Java
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings;
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import android.os.AsyncTask;
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import androidx.annotation.Nullable;
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import com.android.settingslib.utils.ThreadUtils;
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import java.util.concurrent.Future;
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/** A {@link SidecarFragment} which uses an {@link AsyncTask} to perform background work. */
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public abstract class AsyncTaskSidecar<Param, Result> extends SidecarFragment {
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private Future<Result> mAsyncTask;
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@Override
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public void onDestroy() {
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if (mAsyncTask != null) {
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mAsyncTask.cancel(true /* mayInterruptIfRunning */);
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}
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super.onDestroy();
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}
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/**
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* Executes the background task.
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*
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* @param param parameters passed in from {@link #run}
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*/
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protected abstract Result doInBackground(@Nullable Param param);
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/** Handles the background task's result. */
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protected void onPostExecute(Result result) {}
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/** Runs the sidecar and sets the state to RUNNING. */
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public void run(@Nullable final Param param) {
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setState(State.RUNNING, Substate.UNUSED);
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if (mAsyncTask != null) {
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mAsyncTask.cancel(true /* mayInterruptIfRunning */);
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}
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mAsyncTask =
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ThreadUtils.postOnBackgroundThread(
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() -> {
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Result result = doInBackground(param);
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ThreadUtils.postOnMainThread(() -> onPostExecute(result));
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});
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}
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}
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