网站排名哪家好,做平面设计哪个网站下载素材好,做美食网站的目的意义,尚海整装总店地址flutter开发实战-video_player视频播放功能及视频缓存
最近开发过程中video_player播放视频#xff0c;
一、引入video_player
在pubspec.yaml引入video_player video_player: ^2.7.0在iOS上#xff0c;video_player使用的是AVPlayer进行播放。 在Android上#xff0c;…flutter开发实战-video_player视频播放功能及视频缓存
最近开发过程中video_player播放视频
一、引入video_player
在pubspec.yaml引入video_player video_player: ^2.7.0在iOS上video_player使用的是AVPlayer进行播放。 在Android上video_player使用的是ExoPlayer。
二、使用前设置
2.1 在iOS中的设置
在iOS工程中info.plist添加一下设置以便支持HttpsHTTP的视频地址
keyNSAppTransportSecurity/key
dictkeyNSAllowsArbitraryLoads/keytrue/
/dict2.2 在Android中的设置
需要在/android/app/src/main/AndroidManifest.xml文件中添加网络权限
uses-permission android:nameandroid.permission.INTERNET/三、使用前设置video_player
video_player 使用VideoPlayerController来控制播放与暂停
VideoPlayerController的初始化
_controller VideoPlayerController.networkUrl(Uri.parse(https://flutter.github.io/assets-for-api-docs/assets/videos/bee.mp4))..initialize().then((_) {// Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.setState(() {});});显示视频Widget
Center(child: _controller.value.isInitialized? AspectRatio(aspectRatio: _controller.value.aspectRatio,child: VideoPlayer(_controller),): Container(),),控制播放与暂停
// 播放
_controller.play();// 暂停
_controller.pause();完整实例代码
import package:flutter/material.dart;
import package:video_player/video_player.dart;void main() runApp(const VideoApp());/// Stateful widget to fetch and then display video content.
class VideoApp extends StatefulWidget {const VideoApp({super.key});override_VideoAppState createState() _VideoAppState();
}class _VideoAppState extends StateVideoApp {late VideoPlayerController _controller;overridevoid initState() {super.initState();_controller VideoPlayerController.networkUrl(Uri.parse(https://flutter.github.io/assets-for-api-docs/assets/videos/bee.mp4))..initialize().then((_) {// Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.setState(() {});});}overrideWidget build(BuildContext context) {return MaterialApp(title: Video Demo,home: Scaffold(body: Center(child: _controller.value.isInitialized? AspectRatio(aspectRatio: _controller.value.aspectRatio,child: VideoPlayer(_controller),): Container(),),floatingActionButton: FloatingActionButton(onPressed: () {setState(() {_controller.value.isPlaying? _controller.pause(): _controller.play();});},child: Icon(_controller.value.isPlaying ? Icons.pause : Icons.play_arrow,),),),);}overridevoid dispose() {super.dispose();_controller.dispose();}
}注意video_player暂时不支持缓存如果需要可以使用flutter_cache_manager
四 缓存flutter_cache_manager下载文件
使用flutter_cache_manager代码如下
import package:flutter_cache_manager/flutter_cache_manager.dart;
import dart:async;
import dart:typed_data;
import package:file/file.dart;
import package:flutter_suprisebox/utils/string_utils.dart;class CustomCacheManager {static const key customCacheKey;static CacheManager instance CacheManager(Config(key,stalePeriod: const Duration(days: 7),maxNrOfCacheObjects: 20,repo: JsonCacheInfoRepository(databaseName: key),fileService: HttpFileService(),),);FutureFile getSingleFile(String url, {String? key,MapString, String? headers,}) async {return await instance.getSingleFile(url, key: key, headers: headers);}FutureFileInfo? getFileFromCache(String url,{bool ignoreMemCache false}) async {String? key StringUtils.toMD5(url);if (key ! null key.isNotEmpty) {return await instance.getFileFromCache(key, ignoreMemCache: ignoreMemCache);}return null;}FutureFileInfo downloadFile(String url,{String? key,MapString, String? authHeaders,bool force false}) async {return await instance.downloadFile(url, key: key, authHeaders: authHeaders, force: force);}StreamFileResponse getFileStream(String url,{String? key, MapString, String? headers, bool withProgress false}) {return instance.getFileStream(url,key: key, headers: headers, withProgress: withProgress);}Futurevoid removeFile(String key) async {return instance.removeFile(key);}/// Removes all files from the cacheFuturevoid emptyCache() {return instance.emptyCache();}
}添加flutter_cache_manager后flutter_cache_manager会先判断文件是否存在如果不存在则下载视频文件。
使用CustomCacheManager后的视频初始化代码如下
Futurevoid stuVideoPlay() async {_controller?.dispose();if (Platform.isIOS) {_controller VideoPlayerController.network(widget.videoUrl);} else {FileInfo? fileInfo await CustomCacheManager().getFileFromCache(widget.videoUrl);if (fileInfo null) {fileInfo await CustomCacheManager().downloadFile(widget.videoUrl);// if (fileInfo ! null) {_controller VideoPlayerController.file(fileInfo.file);// } else {// _controller VideoPlayerController.network(widget.videoUrl);// }} else {var file await CustomCacheManager().getSingleFile(widget.videoUrl);_controller VideoPlayerController.file(file);}}await _controller?.initialize().then((_) {// Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.setState(() {});});await _controller!.setLooping(true);if (widget.autoPlay) {await _controller?.play();} else {await _controller?.pause();}}特别注意我使用的时候flutter_cache_manager好像暂时不支持iOS。这点可能还需要其他方案来做缓存处理。如果支持了请留言哦也可能我记错了。
四、小结
flutter开发实战-video_player视频播放功能及视频缓存。video_player播放视频flutter_cache_manager处理视频缓存。
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