Flutter音频录制插件flutter_sound配置

最近在开发的一个 Flutter App 中需要用到录音的功能，经过对几款插件的比较，最终确定了采用 flutter_sound 这款插件来实现。Flutter Sound 插件为Android和iOS平台提供了简单的记录器和播放器功能。

flutter_sound 插件目前有两个版本： v4.x.x 和 v5.x.x ，我直接使用的是最新的 v5.1.0 。

有录音必然要有播放，播放的的话我并没有选用 flutter_sound 来同时实现，而是采用里另一款评价量高的插件 audioplayers 。

---

添加依赖

dependencies:
  # 必需
  permission_handler: ^5.0.1
  path_provider: ^1.6.11
  audioplayers: ^0.15.1
  flutter_sound: ^5.0.0
  
  # 可选
  intl: ^0.16.1
  filesize: ^1.0.4
  uuid: ^2.1.0

---

设置权限

Ios权限

需要获取使用麦克风权限和后台录音权限。

在文件 ios/Runner/info.plist 中添加：

<key>NSMicrophoneUsageDescription</key>
<string>Need microphone access for recording</string>
<key>UIBackgroundModes</key>
<array>
	<string>audio</string>
</array>

Android权限

在文件 android/app/src/main/AndroidManifest.xml 中添加:

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

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真机调试初始化

Ios

首先，修改 ios/Podfile 文件中的 platform:

# platform :ios, '9.0'

# 修改成：

platform :ios, '11.0'

然后在 ios 目录下执行 pod install 安装所需依赖：

cd ios
pod install

最后，第一次真机运行一定要通过 XCode 来执行 Build 操作。

1. 在 Finder 中打开 ios 目录，找到 Runner.xcworkspace 文件，选择用 XCode 打开。
2. 配置 Team ：依次选择 左侧目录栏 Runner – TARGETS 中 Runner – Singing&Capabilities – 点击 Team 选项，选择 Apple ID 账户或新增。
3. 执行 Build 操作。

Ios配置注意

上面的最后一步操作中，一定要先通过 XCode 来进行 Build 操作。否则的话，如果你是直接在 VSCode 中执行 flutter run ，会报如下的错误：

...
...
/Users/project/myflutter_test/build/ios/Debug-iphonesimulator/flutter_sound/flutter_sound.framework/Headers/TrackPlayer.h:42:38: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
- (void)nowPlaying:(FlutterMethodCall*)call result: (FlutterResult)result;
                                     ^
/Users/project/myflutter_test/build/ios/Debug-iphonesimulator/flutter_sound/flutter_sound.framework/Headers/TrackPlayer.h:42:38: note: insert '_Nullable' if the pointer may be null
- (void)nowPlaying:(FlutterMethodCall*)call result: (FlutterResult)result;
                                     ^
                                      _Nullable
/Users/project/myflutter_test/build/ios/Debug-iphonesimulator/flutter_sound/flutter_sound.framework/Headers/TrackPlayer.h:42:38: note: insert '_Nonnull' if the pointer should never be null
- (void)nowPlaying:(FlutterMethodCall*)call result: (FlutterResult)result;
                                     ^
                                      _Nonnull
/Users/project/myflutter_test/build/ios/Debug-iphonesimulator/flutter_sound/flutter_sound.framework/Headers/TrackPlayer.h:42:54: warning: block pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
- (void)nowPlaying:(FlutterMethodCall*)call result: (FlutterResult)result;
                                                     ^
/Users/project/myflutter_test/build/ios/Debug-iphonesimulator/flutter_sound/flutter_sound.framework/Headers/TrackPlayer.h:42:54: note: insert '_Nullable' if the block pointer may be null
- (void)nowPlaying:(FlutterMethodCall*)call result: (FlutterResult)result;
                                                     ^
                                                                   _Nullable
/Users/project/myflutter_test/build/ios/Debug-iphonesimulator/flutter_sound/flutter_sound.framework/Headers/TrackPlayer.h:42:54: note: insert '_Nonnull' if the block pointer should never be null
- (void)nowPlaying:(FlutterMethodCall*)call result: (FlutterResult)result;
                                                     ^
                                                                   _Nonnull
                                                            ...
...

Android

打开 android/build.gradle 文件：

将其中的两处 ：

repositories {
    google()
    jcenter()
}

修改为：

repositories {
    // google()
    // jcenter()
    maven { url 'https://maven.aliyun.com/nexus/content/repositories/google' }
    maven { url 'https://maven.aliyun.com/nexus/content/repositories/jcenter'}
    maven { url 'https://maven.aliyun.com/repository/public/' }
}

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