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/*
* Copyright (C) 2020 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.settings;
import android.os.AsyncTask;
import androidx.annotation.Nullable;
import com.android.settingslib.utils.ThreadUtils;
import java.util.concurrent.Future;
/** A {@link SidecarFragment} which uses an {@link AsyncTask} to perform background work. */
public abstract class AsyncTaskSidecar<Param, Result> extends SidecarFragment {
private Future<Result> mAsyncTask;
@Override
public void onDestroy() {
if (mAsyncTask != null) {
mAsyncTask.cancel(true /* mayInterruptIfRunning */);
}
super.onDestroy();
}
/**
* Executes the background task.
*
* @param param parameters passed in from {@link #run}
*/
protected abstract Result doInBackground(@Nullable Param param);
/** Handles the background task's result. */
protected void onPostExecute(Result result) {}
/** Runs the sidecar and sets the state to RUNNING. */
public void run(@Nullable final Param param) {
setState(State.RUNNING, Substate.UNUSED);
if (mAsyncTask != null) {
mAsyncTask.cancel(true /* mayInterruptIfRunning */);
}
mAsyncTask =
ThreadUtils.postOnBackgroundThread(
() -> {
Result result = doInBackground(param);
ThreadUtils.postOnMainThread(() -> onPostExecute(result));
});
}
}
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