android檢測apk及dex方法數
阿新 • • 發佈:2019-02-13
原文:http://www.jianshu.com/p/366b3ae72be6
隨著專案越來越大,android應用不得不面對64k方法數限制的問題,說真的,這個問題很頭疼,雖然網上已經有了多種解決方案,multidex,dynamicApk,程式碼混淆,業務邏輯用c實現然後用jni呼叫等等,dynamicApk需要工程模組化,高度解耦,修改量極大;程式碼混淆,已經做了,治標不治本;業務邏輯用c實現然後用jni呼叫,技術不到家是一種,各種依賴包的新增才是方法數爆棚的罪魁禍首,作用不大;multidex,雖然解了燃眉之急,但仍感到憂心忡忡,不是長久之計,還有各種坑等著你跳。
問題預防,檢測方法數
雖然目前還沒有一勞永逸的方案,只能走一步算一步,避免使用一些方法數較多的庫,時時刻刻意識到這問題,讓它慢一點到來,做我們能做的事,哦彌陀佛。
使用dexcount-gradle-plugin 計算apk方法數
用法
在app/build.gradle新增
buildscript {
repositories {
mavenCentral() // or jcenter()
}
dependencies {
classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.3.0'
}
}
apply plugin: 'com.getkeepsafe.dexcount'
簡單輸出
> ./gradlew assembleDebug
...buildspam...
:app :compileDebugSources
:app:preDexDebug UP-TO-DATE
:app:dexDebug
:app:packageDebug
:app:zipalignDebug
:app:assembleDebug
Total methods in MyApp-debug-5.3.14.apk: 56538
BUILD SUCCESSFUL
Total time: 33.017 secs
使用dex-method-count計算單個dex方法數
解壓apk檔案可以看到classes.dex檔案,如果使用了multidex可能會看到多個classses.dex,classes2.dex等。
這裡使用了網上找的一個指令碼,很早之前看到的,找不到出處了,貼出來
printhex.ps1
<#
.SYNOPSIS
Outputs the number of methods in a dex file.
.PARAMETER Path
Specifies the path to a file. Wildcards are not permitted.
#>
param(
[parameter(Position=0,Mandatory=$TRUE)]
[String] $Path
)
if ( -not (test-path -literalpath $Path) ) {
write-error "Path '$Path' not found." -category ObjectNotFound
exit
}
$item = get-item -literalpath $Path -force
if ( -not ($? -and ($item -is [System.IO.FileInfo])) ) {
write-error "'$Path' is not a file in the file system." -category InvalidType
exit
}
if ( $item.Length -gt [UInt32]::MaxValue ) {
write-error "'$Path' is too large." -category OpenError
exit
}
$stream = [System.IO.File]::OpenRead($item.FullName)
$buffer = new-object Byte[] 2
$stream.Position = 88
$bytesread = $stream.Read($buffer, 0, 2)
$output = $buffer[0..1]
#("{1:X2} {0:X2}") -f $output
$outputdec = $buffer[1]*256 + $buffer[0]
"Number of methods is " + $outputdec
$stream.Close()
dex-method-count.bat
@ECHO OFF
IF "%1"=="" GOTO MissingFileNameError
IF EXIST "%1" (GOTO ContinueProcessing) ELSE (GOTO FileDoesntExist)
:ContinueProcessing
set FileNameToProcess=%1
set FileNameForDx=%~n1.dex
IF "%~x1"==".dex" GOTO ProcessWithPowerShell
REM preprocess Jar with dx
IF "%~x1"==".jar" (
ECHO Processing Jar %FileNameToProcess% with DX!
CALL dx --dex --output=%FileNameForDx% %FileNameToProcess%
set FileNameToProcess=%FileNameForDx%
IF ERRORLEVEL 1 GOTO DxProcessingError
)
:ProcessWithPowerShell
ECHO Counting methods in DEX file %FileNameToProcess%
CALL powershell -noexit -executionpolicy bypass "& ".\printhex.ps1" %FileNameToProcess%
GOTO End
:MissingFileNameError
@ECHO Missing filename for processing
GOTO End
:DxProcessingError
@ECHO Error processing file %1% with dx!
GOTO End
:FileDoesntExist
@ECHO File %1% doesn't exist!
GOTO End
:End
用法:
將上面兩個檔案拷貝到電腦(windows),檔名字和字尾都不要變,且放在同一個目錄下,需要檢測的dex檔案也放在同一級目錄,就像這樣
QQ截圖20151116174811.png
開啟命令列並切到當前目錄下,執行命令
dex-method-count.bat classes.dex
執行結果:Number of methods is 64595
QQ截圖20151116175052.png
計算開源庫方法數的網站
文/dongjunkun(簡書作者)
原文連結:http://www.jianshu.com/p/366b3ae72be6
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