2ef20fb36d
This adds a deletion service to delete files in the Downloads folder. All of the files there are collected and offered to the user to delete. Bug: 28621781 Change-Id: I94431f9abc3a0afa2d07dbab763312c09e830aef
110 lines
3.0 KiB
Java
110 lines
3.0 KiB
Java
/*
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* Copyright (C) 2016 Google Inc.
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* Licensed to 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.utils;
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import android.content.AsyncTaskLoader;
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import android.content.Context;
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/**
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* This class fills in some boilerplate for AsyncTaskLoader to actually load things.
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*
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* Subclasses need to implement {@link AsyncLoader#loadInBackground()} to perform the actual
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* background task, and {@link AsyncLoader#onDiscardResult(T)} to clean up previously loaded
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* results.
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*
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* This loader is based on the MailAsyncTaskLoader from the AOSP EmailUnified repo.
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*/
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public abstract class AsyncLoader<T> extends AsyncTaskLoader<T> {
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private T mResult;
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public AsyncLoader(final Context context) {
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super(context);
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}
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@Override
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protected void onStartLoading() {
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if (mResult != null) {
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deliverResult(mResult);
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}
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if (takeContentChanged() || mResult == null) {
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forceLoad();
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}
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}
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@Override
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protected void onStopLoading() {
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cancelLoad();
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}
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@Override
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public void deliverResult(final T data) {
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if (isReset()) {
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if (data != null) {
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onDiscardResult(data);
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}
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return;
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}
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final T oldResult = mResult;
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mResult = data;
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if (isStarted()) {
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super.deliverResult(data);
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}
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if (oldResult != null && oldResult != mResult) {
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onDiscardResult(oldResult);
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}
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}
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@Override
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protected void onReset() {
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super.onReset();
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onStopLoading();
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if (mResult != null) {
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onDiscardResult(mResult);
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}
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mResult = null;
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}
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@Override
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public void onCanceled(final T data) {
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super.onCanceled(data);
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if (data != null) {
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onDiscardResult(data);
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}
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}
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/**
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* Called when discarding the load results so subclasses can take care of clean-up or
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* recycling tasks. This is not called if the same result (by way of pointer equality) is
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* returned again by a subsequent call to loadInBackground, or if result is null.
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*
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* Note that this may be called concurrently with loadInBackground(), and in some circumstances
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* may be called more than once for a given object.
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*
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* @param result The value returned from {@link AsyncLoader#loadInBackground()} which
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* is to be discarded.
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*/
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protected abstract void onDiscardResult(final T result);
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}
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