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## JDK-GC.md

      
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                tw-Frey
                / JDK-GC.md
            
            
              Created
              August 16, 2023 09:56
            
              
                JDK 18 GC垃圾回收机制比较
              
          
    https://www.jdon.com/61051.html
从 JDK 18 开始，JDK 附带了四个垃圾收集器 (GC)；串行 GC、并行 GC、G1 GC 和 ZGC。在大多数情况下，默认的 GC G1 GC 将是最佳选择。但是，了解 GC 的设计目标可能会有所帮助，并且可能会帮助您实现应用程序的性能目标。本文将对每个 GC 以及何时应该使用它们进行高级研究。
串行垃圾收集器

Serial GC 是 GC 中“最简单的”。它在单个线程上执行所有工作，因此它被命名为“串行”。
Serial GC 最适合在资源有限且 live set 不超过 100 MB 的环境中运行的应用程序。
可以使用 VM 标志启用串行 GC -XX:+UseSerialGC
并行垃圾收集器


## build.gradle
import com.android.build.gradle.api.ApplicationVariant
import com.android.build.gradle.api.BaseVariantOutput
import com.android.build.gradle.internal.api.BaseVariantOutputImpl

android {
    //...

    applicationVariants.all(ApplicationVariantAction())
}

## convert_binary_file_to_base64.ps1
Param(
    $filePath,
    [switch]$reverse = $false
)

## Usage
#
# From binary to UTF8 base-64 file with "b64" extension:
#     .\convert_binary_file_to_base64.ps1 path\to\file.bin
#

## result-of-basic.kt
/* Copyright 2020 Seanghay Yath (@seanghay)
   SPDX-License-Identifier: Apache-2.0 */

sealed class ResultOf<out T> {
  data class Success<out R>(val value: R): ResultOf<R>()
  data class Failure(
     val message: String?,
     val throwable: Throwable?
  ): ResultOf<Nothing>()
}

## CorountineScope_self_Cancel.md

      
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                tw-Frey
                / CorountineScope_self_Cancel.md
            
            
              Created
              January 16, 2023 12:01
            
              
                自己開的 CoroutineScope, 要自己關 (cancel) 
              
          
    The key part of custom usage of CoroutineScope is cancelling it at the end of the lifecycle.

https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-coroutine-scope/

  
## ffmpeg.md

      
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                tw-Frey
                / ffmpeg.md
            
            
              Created
              December 29, 2022 14:01
                — forked from protrolium/ffmpeg.md
            
              
                ffmpeg guide
              
          
    ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:

ffmpeg -i input.mp3 output.wma
You can get the list of supported formats with:

ffmpeg -formats
You can get the list of installed codecs with:


## Safe_call_on_a_non-null_receiver_will_have_nullable_type_in_future_releases.md

      
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                tw-Frey
                / Safe_call_on_a_non-null_receiver_will_have_nullable_type_in_future_releases.md
            
            
              Last active
              December 16, 2022 13:20
            
              
                Safe call on a non-null receiver will have nullable type in future releases.
              
          
    Safe call on a non-null receiver will have nullable type in future releases.
Right now safe call on non nullable receiver has not null type:

"hello"?.length has type Int

In future releases all safe calls will have nullable type:

"hello"?.length will have type Int?


## mobile-hls-video.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Mobile HLS video</title>
</head>
<body>
<h1>Mobile HLS video</h1>

## fab_alpha.md

      
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                tw-Frey
                / fab_alpha.md
            
            
              Last active
              October 23, 2022 21:59
            
              
                FAB 設 半透明被景色時 中間 貌似 卡住 氣泡 (髒髒的)
              
          
    現況


期許


## SignatureCheck.java
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;

public class TamperCheck {

//we store the hash of the signture for a little more protection
private static final String APP_SIGNATURE = "1038C0E34658923C4192E61B16846";
	import com.android.build.gradle.api.ApplicationVariant
	import com.android.build.gradle.api.BaseVariantOutput
	import com.android.build.gradle.internal.api.BaseVariantOutputImpl

	android {
	//...

	applicationVariants.all(ApplicationVariantAction())
	}
	Param(
	$filePath,
	[switch]$reverse = $false
	)

	## Usage
	#
	# From binary to UTF8 base-64 file with "b64" extension:
	# .\convert_binary_file_to_base64.ps1 path\to\file.bin
	#
	/* Copyright 2020 Seanghay Yath (@seanghay)
	SPDX-License-Identifier: Apache-2.0 */

	sealed class ResultOf<out T> {
	data class Success<out R>(val value: R): ResultOf<R>()
	data class Failure(
	val message: String?,
	val throwable: Throwable?
	): ResultOf<Nothing>()
	}
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>Mobile HLS video</title>
	</head>
	<body>
	<h1>Mobile HLS video</h1>
	import android.content.Context;
	import android.content.pm.PackageInfo;
	import android.content.pm.PackageManager;
	import android.content.pm.PackageManager.NameNotFoundException;
	import android.content.pm.Signature;

	public class TamperCheck {

	//we store the hash of the signture for a little more protection
	private static final String APP_SIGNATURE = "1038C0E34658923C4192E61B16846";