HarmonyOS之实现对象关系映射ORM数据库的升级、备份、删除、恢复以及表的增删改查

/* * Copyright (c) 2021 Huawei Device Co., Ltd. * 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 ohos.samples.audioplayer; import ohos.samples.audioplayer.utils.LogUtil; import ohos.aafwk.ability.Ability; import ohos.aafwk.content.Intent; import ohos.aafwk.content.Operation; import ohos.agp.components.Button; import ohos.agp.components.Component; import ohos.agp.components.ComponentContainer; import ohos.agp.components.LayoutScatter; import ohos.agp.components.ListContainer; import ohos.agp.components.RecycleItemProvider; import ohos.agp.components.Text; import ohos.bundle.ElementName; import ohos.bundle.IBundleManager; import ohos.media.common.AVMetadata; import ohos.media.common.sessioncore.AVConnectionCallback; import ohos.media.common.sessioncore.AVControllerCallback; import ohos.media.common.sessioncore.AVElement; import ohos.media.common.sessioncore.AVPlaybackState; import ohos.media.common.sessioncore.AVQueueElement; import ohos.media.common.sessioncore.AVSubscriptionCallback; import ohos.media.sessioncore.AVBrowser; import ohos.media.sessioncore.AVController; import ohos.security.SystemPermission; import ohos.utils.PacMap; import ohos.utils.net.Uri; import java.util.ArrayList; import java.util.List; /** * The client of the player, that implements a AVBrowser. */ public class AVPlayClient extends Ability { private static final String TAG = AVPlayClient.class.getSimpleName(); // provide the main client function of media framework private AVBrowser avBrowser; // provide the operations by the avBrowser private AVController avController; private Button playButton; private Button previousButton; private Button nextButton; private Text titleText; private Text progressText; private Text totalTimeText; // the media list got from the service private List<AVElement> avElementList = new ArrayList<>(); private AVElementItemProvider avElementsListItemProvider; @Override public void onStart(Intent intent) { super.onStart(intent); LogUtil.info(TAG, "onStart"); super.setUIContent(ResourceTable.Layout_main_play_layout); // bind the handler for all the components previousButton = (Button) findComponentById(ResourceTable.Id_to_previous_button); previousButton.setClickedListener(component -> handlerPrevEvent()); nextButton = (Button) findComponentById(ResourceTable.Id_to_next_button); nextButton.setClickedListener(component -> handlerNextEvent()); playButton = (Button) findComponentById(ResourceTable.Id_play_button); playButton.setClickedListener(component -> handlerPlayEvent()); titleText = (Text) findComponentById(ResourceTable.Id_audio_title); progressText = (Text) findComponentById(ResourceTable.Id_audio_progress); totalTimeText = (Text) findComponentById(ResourceTable.Id_audio_total_time); ListContainer avElementsListContainer = (ListContainer) findComponentById(ResourceTable.Id_play_list); avElementsListItemProvider = new AVElementItemProvider(); avElementsListContainer.setItemProvider(avElementsListItemProvider); Component jumpComponent = findComponentById(ResourceTable.Id_jump_to_next_page_button); jumpComponent.setClickedListener(component -> jumpOnline()); // init the avBrowser and connect the browser service ElementName elementName = new ElementName("", AVPlayService.class.getPackage().getName(), AVPlayService.class.getName()); avBrowser = new AVBrowser(this, elementName, avConnectionCallback, null); connectService(); } private void jumpOnline() { Intent intent = new Intent(); Operation operation = new Intent.OperationBuilder().withBundleName( OnlinePlayClient.class.getPackage().getName()).withAbilityName(OnlinePlayClient.class.getName()).build(); intent.setOperation(operation); startAbility(intent); } @Override protected void onStop() { LogUtil.info(TAG, "onStop"); super.onStop(); Intent intent = new Intent(); Operation operation = new Intent.OperationBuilder().withBundleName(AVPlayService.class.getPackage().getName()) .withAbilityName(AVPlayService.class.getName()) .build(); intent.setOperation(operation); stopAbility(intent); if (avBrowser != null && avBrowser.isConnected()) { avBrowser.disconnect(); } } /** * create the list of audios */ class AVElementItemProvider extends RecycleItemProvider { @Override public int getCount() { return avElementList.size(); } @Override public Object getItem(int position) { return avElementList.get(position); } @Override public long getItemId(int position) { return position; } @Override public Component getComponent(int position, Component component, ComponentContainer componentContainer) { final Object item = avElementList.get(position); if (component == null && item instanceof AVElement) { String itemText = ((AVElement) item).getAVDescription().getTitle().toString(); Text text = (Text) LayoutScatter.getInstance(AVPlayClient.this) .parse(ResourceTable.Layout_list_item, null, false); text.setText(itemText); return text; } else { return component; } } }; private AVConnectionCallback avConnectionCallback = new AVConnectionCallback() { @Override public void onConnected() { LogUtil.info(TAG + "-AVConnectionCallback", "onConnected"); // before subscribe, first to unsubscribe, it's necessary. avBrowser.unsubscribeByParentMediaId(AVPlayService.PARENT_MEDIA_ID_1); // onLoadAVElementList() on service will be called if subscribed. avBrowser.subscribeByParentMediaId(AVPlayService.PARENT_MEDIA_ID_1, avSubscriptionCallback); } @Override public void onDisconnected() { LogUtil.warn(TAG + "-AVConnectionCallback", "onDisconnected"); } @Override public void onConnectFailed() { LogUtil.error(TAG + "-AVConnectionCallback", "onConnectionFailed"); } }; private AVControllerCallback avControllerCallback = new AVControllerCallback() { @Override public void onAVMetadataChanged(AVMetadata metadata) { // this will be called with avSession.setAVMetadata() called on service. super.onAVMetadataChanged(metadata); LogUtil.info(TAG + "-AVControllerCallback", "onAVMetadataChanged"); titleText.setText(metadata.getString(AVMetadata.AVTextKey.TITLE)); totalTimeText.setText(String.valueOf(metadata.getLong(AVMetadata.AVLongKey.DURATION) / 1000)); } @Override public void onAVPlaybackStateChanged(AVPlaybackState playbackState) { // this will be called with avSession.setAVPlaybackState() called on service. super.onAVPlaybackStateChanged(playbackState); LogUtil.info(TAG + "-AVControllerCallback", "onAVPlaybackStateChanged"); switch (playbackState.getAVPlaybackState()) { case AVPlaybac