在xml中“直接”使用px的小技巧和工具

注：这个idea出自知乎某个回答，但是来源找不到了。。。工具是自己写的。

在项目开发中，UI给过来的设计图上的尺寸标识，一般以px（像素）为单位。Android工程师需根据设计图的尺寸将px换成dp，填到layout.xml中。

有了这个工具，可以很方便地实现这一点。

首先，确认设计图属于下列哪种规格：

ldpi (low) ~120dpi
mdpi (medium) ~160dpi
hdpi (high) ~240dpi
xhdpi (extra-high) ~320dpi
xxhdpi (extra-extra-high) ~480dpi
xxxhdpi (extra-extra-extra-high) ~640dpi
 

然后安装python，运行一个脚本：

然后在控制台中输入：

pythondp_convertor.py 1 100 xxhdpi
 

可得到：

<!-- wrapperfor px -->
<dimenname="_1px">0.3dp</dimen>
<dimenname="_2px">0.7dp</dimen>
<dimenname="_3px">1.0dp</dimen>
<dimenname="_4px">1.3dp</dimen>
<dimenname="_5px">1.7dp</dimen>
<dimenname="_6px">2.0dp</dimen>
<dimenname="_7px">2.3dp</dimen>
<dimenname="_8px">2.6dp</dimen>
<dimenname="_9px">3.0dp</dimen>
<dimenname="_10px">3.3dp</dimen>
<dimenname="_11px">3.6dp</dimen>
<dimenname="_12px">4.0dp</dimen>
<dimenname="_13px">4.3dp</dimen>
<dimenname="_14px">4.6dp</dimen>
<dimenname="_15px">5.0dp</dimen>
<dimenname="_16px">5.3dp</dimen>
<dimenname="_17px">5.6dp</dimen>
<dimenname="_18px">5.9dp</dimen>
<dimenname="_19px">6.3dp</dimen>
<dimenname="_20px">6.6dp</dimen>
<dimenname="_21px">6.9dp</dimen>
<dimenname="_22px">7.3dp</dimen>
<dimenname="_23px">7.6dp</dimen>
<dimenname="_24px">7.9dp</dimen>
<dimenname="_25px">8.2dp</dimen>
<dimenname="_26px">8.6dp</dimen>
<dimenname="_27px">8.9dp</dimen>
<dimenname="_28px">9.2dp</dimen>
<dimenname="_29px">9.6dp</dimen>
<dimenname="_30px">9.9dp</dimen>
<dimenname="_31px">10.2dp</dimen>
<dimenname="_32px">10.6dp</dimen>
<dimenname="_33px">10.9dp</dimen>
<dimenname="_34px">11.2dp</dimen>
<dimenname="_35px">11.6dp</dimen>
<dimenname="_36px">11.9dp</dimen>
<dimenname="_37px">12.2dp</dimen>
<dimenname="_38px">12.5dp</dimen>
<dimenname="_39px">12.9dp</dimen>
<dimenname="_40px">13.2dp</dimen>
<dimenname="_41px">13.5dp</dimen>
<dimenname="_42px">13.9dp</dimen>
<dimenname="_43px">14.2dp</dimen>
<dimenname="_44px">14.5dp</dimen>
<dimenname="_45px">14.9dp</dimen>
<dimenname="_46px">15.2dp</dimen>
<dimenname="_47px">15.5dp</dimen>
<dimenname="_48px">15.8dp</dimen>
<dimenname="_49px">16.2dp</dimen>
<dimenname="_50px">16.5dp</dimen>
<dimenname="_51px">16.8dp</dimen>
<dimenname="_52px">17.2dp</dimen>
<dimenname="_53px">17.5dp</dimen>
<dimenname="_54px">17.8dp</dimen>
<dimenname="_55px">18.2dp</dimen>
<dimenname="_56px">18.5dp</dimen>
<dimenname="_57px">18.8dp</dimen>
<dimenname="_58px">19.1dp</dimen>
<dimenname="_59px">19.5dp</dimen>
<dimenname="_60px">19.8dp</dimen>
<dimenname="_61px">20.1dp</dimen>
<dimenname="_62px">20.5dp</dimen>
<dimenname="_63px">20.8dp</dimen>
<dimenname="_64px">21.1dp</dimen>
<dimenname="_65px">21.4dp</dimen>
<dimenname="_66px">21.8dp</dimen>
<dimenname="_67px">22.1dp</dimen>
<dimenname="_68px">22.4dp</dimen>
<dimenname="_69px">22.8dp</dimen>
<dimenname="_70px">23.1dp</dimen>
<dimenname="_71px">23.4dp</dimen>
<dimenname="_72px">23.8dp</dimen>
<dimenname="_73px">24.1dp</dimen>
<dimenname="_74px">24.4dp</dimen>
<dimenname="_75px">24.8dp</dimen>
<dimenname="_76px">25.1dp</dimen>
<dimenname="_77px">25.4dp</dimen>
<dimenname="_78px">25.7dp</dimen>
<dimenname="_79px">26.1dp</dimen>
<dimenname="_80px">26.4dp</dimen>
<dimenname="_81px">26.7dp</dimen>
<dimenname="_82px">27.1dp</dimen>
<dimenname="_83px">27.4dp</dimen>
<dimenname="_84px">27.7dp</dimen>
<dimenname="_85px">28.1dp</dimen>
<dimenname="_86px">28.4dp</dimen>
<dimenname="_87px">28.7dp</dimen>
<dimenname="_88px">29.0dp</dimen>
<dimenname="_89px">29.4dp</dimen>
<dimenname="_90px">29.7dp</dimen>
<dimenname="_91px">30.0dp</dimen>
<dimenname="_92px">30.4dp</dimen>
<dimenname="_93px">30.7dp</dimen>
<dimenname="_94px">31.0dp</dimen>
<dimenname="_95px">31.4dp</dimen>
<dimenname="_96px">31.7dp</dimen>
<dimenname="_97px">32.0dp</dimen>
<dimenname="_98px">32.3dp</dimen>
<dimenname="_99px">32.7dp</dimen>
<dimenname="_100px">33.0dp</dimen>
 
<dimenname="_1spx">0.3sp</dimen>
<dimenname="_2spx">0.7sp</dimen>
<dimenname="_3spx">1.0sp</dimen>
<dimenname="_4spx">1.3sp</dimen>
<dimenname="_5spx">1.7sp</dimen>
<dimenname="_6spx">2.0sp</dimen>
<dimenname="_7spx">2.3sp</dimen>
<dimenname="_8spx">2.6sp</dimen>
<dimenname="_9spx">3.0sp</dimen>
<dimenname="_10spx">3.3sp</dimen>
<dimenname="_11spx">3.6sp</dimen>
<dimenname="_12spx">4.0sp</dimen>
<dimenname="_13spx">4.3sp</dimen>
<dimenname="_14spx">4.6sp</dimen>
<dimenname="_15spx">5.0sp</dimen>
<dimenname="_16spx">5.3sp</dimen>
<dimenname="_17spx">5.6sp</dimen>
<dimenname="_18spx">5.9sp</dimen>
<dimenname="_19spx">6.3sp</dimen>
<dimenname="_20spx">6.6sp</dimen>
<dimenname="_21spx">6.9sp</dimen>
<dimenname="_22spx">7.3sp</dimen>
<dimenname="_23spx">7.6sp</dimen>
<dimenname="_24spx">7.9sp</dimen>
<dimenname="_25spx">8.2sp</dimen>
<dimenname="_26spx">8.6sp</dimen>
<dimenname="_27spx">8.9sp</dimen>
<dimenname="_28spx">9.2sp</dimen>
<dimenname="_29spx">9.6sp</dimen>
<dimenname="_30spx">9.9sp</dimen>
<dimenname="_31spx">10.2sp</dimen>
<dimenname="_32spx">10.6sp</dimen>
<dimenname="_33spx">10.9sp</dimen>
<dimenname="_34spx">11.2sp</dimen>
<dimenname="_35spx">11.6sp</dimen>
<dimenname="_36spx">11.9sp</dimen>
<dimenname="_37spx">12.2sp</dimen>
<dimenname="_38spx">12.5sp</dimen>
<dimenname="_39spx">12.9sp</dimen>
<dimenname="_40spx">13.2sp</dimen>
<dimenname="_41spx">13.5sp</dimen>
<dimenname="_42spx">13.9sp</dimen>
<dimenname="_43spx">14.2sp</dimen>
<dimenname="_44spx">14.5sp</dimen>
<dimenname="_45spx">14.9sp</dimen>
<dimenname="_46spx">15.2sp</dimen>
<dimenname="_47spx">15.5sp</dimen>
<dimenname="_48spx">15.8sp</dimen>
<dimenname="_49spx">16.2sp</dimen>
<dimenname="_50spx">16.5sp</dimen>
<dimenname="_51spx">16.8sp</dimen>
<dimenname="_52spx">17.2sp</dimen>
<dimenname="_53spx">17.5sp</dimen>
<dimenname="_54spx">17.8sp</dimen>
<dimenname="_55spx">18.2sp</dimen>
<dimenname="_56spx">18.5sp</dimen>
<dimenname="_57spx">18.8sp</dimen>
<dimenname="_58spx">19.1sp</dimen>
<dimenname="_59spx">19.5sp</dimen>
<dimenname="_60spx">19.8sp</dimen>
<dimenname="_61spx">20.1sp</dimen>
<dimenname="_62spx">20.5sp</dimen>
<dimenname="_63spx">20.8sp</dimen>
<dimenname="_64spx">21.1sp</dimen>
<dimenname="_65spx">21.4sp</dimen>
<dimenname="_66spx">21.8sp</dimen>
<dimenname="_67spx">22.1sp</dimen>
<dimenname="_68spx">22.4sp</dimen>
<dimenname="_69spx">22.8sp</dimen>
<dimenname="_70spx">23.1sp</dimen>
<dimenname="_71spx">23.4sp</dimen>
<dimenname="_72spx">23.8sp</dimen>
<dimenname="_73spx">24.1sp</dimen>
<dimenname="_74spx">24.4sp</dimen>
<dimenname="_75spx">24.8sp</dimen>
<dimenname="_76spx">25.1sp</dimen>
<dimenname="_77spx">25.4sp</dimen>
<dimenname="_78spx">25.7sp</dimen>
<dimenname="_79spx">26.1sp</dimen>
<dimenname="_80spx">26.4sp</dimen>
<dimenname="_81spx">26.7sp</dimen>
<dimenname="_82spx">27.1sp</dimen>
<dimenname="_83spx">27.4sp</dimen>
<dimenname="_84spx">27.7sp</dimen>
<dimenname="_85spx">28.1sp</dimen>
<dimenname="_86spx">28.4sp</dimen>
<dimenname="_87spx">28.7sp</dimen>
<dimenname="_88spx">29.0sp</dimen>
<dimenname="_89spx">29.4sp</dimen>
<dimenname="_90spx">29.7sp</dimen>
<dimenname="_91spx">30.0sp</dimen>
<dimenname="_92spx">30.4sp</dimen>
<dimenname="_93spx">30.7sp</dimen>
<dimenname="_94spx">31.0sp</dimen>
<dimenname="_95spx">31.4sp</dimen>
<dimenname="_96spx">31.7sp</dimen>
<dimenname="_97spx">32.0sp</dimen>
<dimenname="_98spx">32.3sp</dimen>
<dimenname="_99spx">32.7sp</dimen>
<dimenname="_100spx">33.0sp</dimen>
 

将以上复制到你项目的dimens.xml中，以后可以直接按照设计图的px值，在layout.xml中写 @dimen/_**px 了。