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Flutter 使用 video_player 播放视频，android模拟器上播放没有问题，真机出现播放画面黑屏问题。

检查debug信息，发现出现一条错误提示：

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PlatformException(VideoError, Video player had error com.google.android.exoplayer2.ExoPlaybackException: Source error, null, null)

问题原因
安卓上从9.0(API level28)开始，明文通信支持默认是被禁用的，官方说法是不安全。因为我们播放的视频源是http协议，所以无法播放。

解决方法
修改AndroidManifest.xml

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<manifest ...>
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        ...
        android:usesCleartextTraffic="true"
        ...>
        ...
    </application>
</manifest>

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解决安装 ruby3 错误 _rvm_log_dotted:23: permission denied:

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rvm install ruby@latest

macos 安装 ruby3 出现错误:

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Error running ' CFLAGS=-O3 -I/usr/local/opt/libyaml/include -I/usr/local/opt/libksba/include -I/usr/local/opt/readline/include -I/usr/local/opt/zlib/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/libyaml/include -I/usr/local/opt/libksba/include -I/usr/local/opt/readline/include -I/usr/local/opt/zlib/include -I/usr/local/opt/openssl@1.1/include LDFLAGS=-L/usr/local/opt/libyaml/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/zlib/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/zlib/lib -L/usr/local/opt/openssl@1.1/lib ./configure --prefix=/Users/tiny/.rvm/rubies/ruby-3.0.0 --disable-install-doc --enable-shared', please read /Users/tiny/.rvm/log/1608892720_ruby-3.0.0/configure.log There has been an error while running configure. Halting the installation.

When I $cat /Users/tiny/.rvm/log/1608892720_ruby-3.0.0/configure.log

查看日志错误为：_rvm_log_dotted:23: permission denied:

使用下面命令重新安装成功
rvm install ruby-3.0.0 –with-openssl-dir=brew --prefix openssl