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/*
* Copyright (C) 2015 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.tv.data;
import android.content.ContentProviderOperation;
import android.content.Context;
import android.content.OperationApplicationException;
import android.content.SharedPreferences;
import android.graphics.Bitmap.CompressFormat;
import android.media.tv.TvContract;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.RemoteException;
import android.support.annotation.MainThread;
import android.text.TextUtils;
import android.util.Log;
import com.android.tv.common.util.PermissionUtils;
import com.android.tv.common.util.SharedPreferencesUtils;
import com.android.tv.data.api.Channel;
import com.android.tv.util.images.BitmapUtils;
import com.android.tv.util.images.BitmapUtils.ScaledBitmapInfo;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Fetches channel logos from the cloud into the database. It's for the channels which have no logos
* or need update logos. This class is thread safe.
*/
public class ChannelLogoFetcher {
private static final String TAG = "ChannelLogoFetcher";
private static final boolean DEBUG = false;
private static final String PREF_KEY_IS_FIRST_TIME_FETCH_CHANNEL_LOGO =
"is_first_time_fetch_channel_logo";
private static FetchLogoTask sFetchTask;
/**
* Fetches the channel logos from the cloud data and insert them into TvProvider. The previous
* task is canceled and a new task starts.
*/
@MainThread
public static void startFetchingChannelLogos(Context context, List<Channel> channels) {
if (!PermissionUtils.hasAccessAllEpg(context)) {
// TODO: support this feature for non-system LC app. b/23939816
return;
}
if (sFetchTask != null) {
sFetchTask.cancel(true);
sFetchTask = null;
}
if (DEBUG) Log.d(TAG, "Request to start fetching logos.");
if (channels == null || channels.isEmpty()) {
return;
}
sFetchTask = new FetchLogoTask(context.getApplicationContext(), channels);
sFetchTask.execute();
}
private ChannelLogoFetcher() {}
private static final class FetchLogoTask extends AsyncTask<Void, Void, Void> {
private final Context mContext;
private final List<Channel> mChannels;
private FetchLogoTask(Context context, List<Channel> channels) {
mContext = context;
mChannels = channels;
}
@Override
protected Void doInBackground(Void... arg) {
if (isCancelled()) {
if (DEBUG) Log.d(TAG, "Fetching the channel logos has been canceled");
return null;
}
List<Channel> channelsToUpdate = new ArrayList<>();
List<Channel> channelsToRemove = new ArrayList<>();
// Updates or removes the logo by comparing the logo uri which is got from the cloud
// and the stored one. And we assume that the data got form the cloud is 100%
// correct and completed.
SharedPreferences sharedPreferences =
mContext.getSharedPreferences(
SharedPreferencesUtils.SHARED_PREF_CHANNEL_LOGO_URIS,
Context.MODE_PRIVATE);
SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();
Map<String, ?> uncheckedChannels = sharedPreferences.getAll();
boolean isFirstTimeFetchChannelLogo =
sharedPreferences.getBoolean(PREF_KEY_IS_FIRST_TIME_FETCH_CHANNEL_LOGO, true);
// Iterating channels.
for (Channel channel : mChannels) {
String channelIdString = Long.toString(channel.getId());
String storedChannelLogoUri = (String) uncheckedChannels.remove(channelIdString);
if (!TextUtils.isEmpty(channel.getLogoUri())
&& !TextUtils.equals(storedChannelLogoUri, channel.getLogoUri())) {
channelsToUpdate.add(channel);
sharedPreferencesEditor.putString(channelIdString, channel.getLogoUri());
} else if (TextUtils.isEmpty(channel.getLogoUri())
&& (!TextUtils.isEmpty(storedChannelLogoUri)
|| isFirstTimeFetchChannelLogo)) {
channelsToRemove.add(channel);
sharedPreferencesEditor.remove(channelIdString);
}
}
// Removes non existing channels from SharedPreferences.
for (String channelId : uncheckedChannels.keySet()) {
sharedPreferencesEditor.remove(channelId);
}
// Updates channel logos.
for (Channel channel : channelsToUpdate) {
if (isCancelled()) {
if (DEBUG) Log.d(TAG, "Fetching the channel logos has been canceled");
return null;
}
// Downloads the channel logo.
String logoUri = channel.getLogoUri();
ScaledBitmapInfo bitmapInfo =
BitmapUtils.decodeSampledBitmapFromUriString(
mContext, logoUri, Integer.MAX_VALUE, Integer.MAX_VALUE);
if (bitmapInfo == null) {
Log.e(
TAG,
"Failed to load bitmap. {channelName="
+ channel.getDisplayName()
+ ", "
+ "logoUri="
+ logoUri
+ "}");
continue;
}
if (isCancelled()) {
if (DEBUG) Log.d(TAG, "Fetching the channel logos has been canceled");
return null;
}
// Inserts the logo to DB.
Uri dstLogoUri = TvContract.buildChannelLogoUri(channel.getId());
try (OutputStream os = mContext.getContentResolver().openOutputStream(dstLogoUri)) {
bitmapInfo.bitmap.compress(CompressFormat.PNG, 100, os);
} catch (IOException e) {
Log.e(TAG, "Failed to write " + logoUri + " to " + dstLogoUri, e);
// Removes it from the shared preference for the failed channels to make it
// retry next time.
sharedPreferencesEditor.remove(Long.toString(channel.getId()));
continue;
}
if (DEBUG) {
Log.d(
TAG,
"Inserting logo file to DB succeeded. {from="
+ logoUri
+ ", to="
+ dstLogoUri
+ "}");
}
}
// Removes the logos for the channels that have logos before but now
// their logo uris are null.
boolean deleteChannelLogoFailed = false;
if (!channelsToRemove.isEmpty()) {
ArrayList<ContentProviderOperation> ops = new ArrayList<>();
for (Channel channel : channelsToRemove) {
ops.add(
ContentProviderOperation.newDelete(
TvContract.buildChannelLogoUri(channel.getId()))
.build());
}
try {
mContext.getContentResolver().applyBatch(TvContract.AUTHORITY, ops);
} catch (RemoteException | OperationApplicationException e) {
deleteChannelLogoFailed = true;
Log.e(TAG, "Error deleting obsolete channels", e);
}
}
if (isFirstTimeFetchChannelLogo && !deleteChannelLogoFailed) {
sharedPreferencesEditor.putBoolean(
PREF_KEY_IS_FIRST_TIME_FETCH_CHANNEL_LOGO, false);
}
sharedPreferencesEditor.commit();
if (DEBUG) Log.d(TAG, "Fetching logos has been finished successfully.");
return null;
}
@Override
protected void onPostExecute(Void result) {
sFetchTask = null;
}
}
}
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