Sometimes we need to put a lot of configurations in gradle file,in order to build different apks.However, this could cause a serious gradle effiency issue,that is everything is fxxking slow,inlcuding gradle sync,gradle window fake dead and so on.It turns out we can ignore some tasks to make things a lot better!

下面是正文

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通过使用忽略不相关task的方式，可以大大加快gradle sync的速度

例如应用有四种flavor

flavorDimensions "flavorA","flavorB","flavoC","flavorD"
productFlavors{
    flavorAA{
        dimension "flavorA"
    }
    flavorAB{
        dimension "flavorA"
    }
    flavorBA{
        dimension "flavorB"
    }
    flavorBB{
        dimension "flavorB"
    }
    flavorCA{
        dimension "flavorC"
    }
    flavorCB{
        dimension "flavorC"
    }
    flavorDA{
        dimension "flavorD"
    }
    flavorDB{
        dimension "flavorD"
    }
}

经过组合，一共有8种打包方式，16种build variants（包括debug和release），这时候打包速度其实还可以接受

现在添加gradle脚本，忽略不相关task，首先在app模块的build.gradle添加代码，读取local.properties

Properties properties = new Properties()
properties.load(project.rootProject.file('local.properties').newDataInputStream())
def flavorAValue = properties.getProperty("flavorA")
def flavorBValue = properties.getProperty("flavorB")
def flavorCValue = properties.getProperty("flavorC")
def flavorDValue = properties.getProperty("flavorD")
if (flavorAValue == null)
    flavorAValue = 'flavorAA'
if (flavorBValue == null)
    flavorBValue = 'flavorBA'
if (flavorCValue == null)
    flavorCValue = 'flavorCA'
if (flavorDValue == null)
    flavorDValue = 'flavorDA'
def compositeFlavors = flavorAValue+flavorBValue+flavorCValue+flavorDValue

同样的文件，添加代码，忽略不相关task

android{
    android.variantFilter { variant ->
        if(!variant.getName().toUpperCase().startsWith(compositeFlavors.toUpperCase())){
            variant.setIgnore(true)
        }
    }
}

重新sync，将看到Build Variant窗口只剩下两个选项flavorAAflavorBAflavorCAflavorDADebug和flavorAAflavorBAflavorCAflavorDADebug，同理Gradle窗口下的选项也仅剩下flavorAAflavorBAflavorCAflavor相关的task