| /* |
| * Copyright (C) 2021 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 androidx.window.common; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.database.ContentObserver; |
| import android.net.Uri; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.provider.Settings; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| import androidx.window.util.BaseDataProducer; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Optional; |
| |
| /** |
| * Implementation of {@link androidx.window.util.DataProducer} that produces |
| * {@link CommonDisplayFeature} parsed from a string stored in {@link Settings}. |
| */ |
| public final class SettingsDisplayFeatureProducer |
| extends BaseDataProducer<List<DisplayFeature>> { |
| private static final boolean DEBUG = false; |
| private static final String TAG = "SettingsDisplayFeatureProducer"; |
| private static final String DISPLAY_FEATURES = "display_features"; |
| |
| private final Uri mDisplayFeaturesUri = |
| Settings.Global.getUriFor(DISPLAY_FEATURES); |
| |
| private final ContentResolver mResolver; |
| private final ContentObserver mObserver; |
| private boolean mRegisteredObservers; |
| |
| public SettingsDisplayFeatureProducer(@NonNull Context context) { |
| mResolver = context.getContentResolver(); |
| mObserver = new SettingsObserver(); |
| } |
| |
| @Override |
| @Nullable |
| public Optional<List<DisplayFeature>> getData() { |
| String displayFeaturesString = Settings.Global.getString(mResolver, DISPLAY_FEATURES); |
| if (displayFeaturesString == null) { |
| return Optional.empty(); |
| } |
| |
| List<DisplayFeature> features = new ArrayList<>(); |
| if (TextUtils.isEmpty(displayFeaturesString)) { |
| return Optional.of(features); |
| } |
| String[] featureStrings = displayFeaturesString.split(";"); |
| |
| for (String featureString : featureStrings) { |
| CommonDisplayFeature feature; |
| try { |
| feature = CommonDisplayFeature.parseFromString(featureString); |
| } catch (IllegalArgumentException e) { |
| if (DEBUG) { |
| Log.w(TAG, "Failed to parse display feature: " + featureString, e); |
| } |
| continue; |
| } |
| features.add(feature); |
| } |
| return Optional.of(features); |
| } |
| |
| /** |
| * Registers settings observers, if needed. When settings observers are registered for this |
| * producer callbacks for changes in data will be triggered. |
| */ |
| public void registerObserversIfNeeded() { |
| if (mRegisteredObservers) { |
| return; |
| } |
| mRegisteredObservers = true; |
| mResolver.registerContentObserver(mDisplayFeaturesUri, false /* notifyForDescendants */, |
| mObserver /* ContentObserver */); |
| } |
| |
| /** |
| * Unregisters settings observers, if needed. When settings observers are unregistered for this |
| * producer callbacks for changes in data will not be triggered. |
| */ |
| public void unregisterObserversIfNeeded() { |
| if (!mRegisteredObservers) { |
| return; |
| } |
| mRegisteredObservers = false; |
| mResolver.unregisterContentObserver(mObserver); |
| } |
| |
| private final class SettingsObserver extends ContentObserver { |
| SettingsObserver() { |
| super(new Handler(Looper.getMainLooper())); |
| } |
| |
| @Override |
| public void onChange(boolean selfChange, Uri uri) { |
| if (mDisplayFeaturesUri.equals(uri)) { |
| notifyDataChanged(); |
| } |
| } |
| } |
| } |