| /* |
| * 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 androidx.window.util.BaseDataProducer; |
| |
| import java.util.Optional; |
| |
| /** |
| * Implementation of {@link androidx.window.util.DataProducer} that provides the device posture |
| * as an {@link Integer} from a value stored in {@link Settings}. |
| */ |
| public final class SettingsDevicePostureProducer extends BaseDataProducer<Integer> { |
| private static final String DEVICE_POSTURE = "device_posture"; |
| |
| private final Uri mDevicePostureUri = |
| Settings.Global.getUriFor(DEVICE_POSTURE); |
| |
| private final ContentResolver mResolver; |
| private final ContentObserver mObserver; |
| private boolean mRegisteredObservers; |
| |
| public SettingsDevicePostureProducer(@NonNull Context context) { |
| mResolver = context.getContentResolver(); |
| mObserver = new SettingsObserver(); |
| } |
| |
| @Override |
| @Nullable |
| public Optional<Integer> getData() { |
| int posture = Settings.Global.getInt(mResolver, DEVICE_POSTURE, -1); |
| return posture == -1 ? Optional.empty() : Optional.of(posture); |
| } |
| |
| /** |
| * 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(mDevicePostureUri, 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 (mDevicePostureUri.equals(uri)) { |
| notifyDataChanged(); |
| } |
| } |
| } |
| } |