很长一段时间后，我重新打开了一个 Android Studio 项目，并且我看到像往常一样快速构建，但现在 Android Studio (3.5) 的“安装”步骤需要几分钟，而过去需要几秒钟。
如果我在安装时打开设备 Logcat，我可以看到大量这些：
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.onSaveInstanceState(android.os.Bundle)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.onViewCreated(android.view.View, android.os.Bundle)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.onViewModelCreated()
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.removeCancelListener(com.package.base.view.BaseDialog$CancelListener)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.removeDismissListener(com.package.base.view.BaseDialog$DismissListener)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.setChildFragmentInjector(dagger.android.DispatchingAndroidInjector)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.setSharedValue(java.lang.String, java.lang.Object)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseDialog.setViewModelFactory(androidx.lifecycle.ViewModelProvider$Factory)
W/dex2oat: Method processed more than once: dagger.android.AndroidInjector com.package.base.view.BaseDialog.supportFragmentInjector()
I/dex2oat: Explicit concurrent copying GC freed 647(112KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 60us total 250.774ms
I/dex2oat: Explicit concurrent copying GC freed 446(29KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 60us total 252.704ms
I/dex2oat: Explicit concurrent copying GC freed 396(13KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 67us total 257.367ms
I/dex2oat: Explicit concurrent copying GC freed 413(13KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 68us total 258.540ms
I/dex2oat: Explicit concurrent copying GC freed 413(13KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 64us total 253.988ms
I/dex2oat: Explicit concurrent copying GC freed 413(13KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 61us total 258.701ms
I/dex2oat: Explicit concurrent copying GC freed 413(13KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 60us total 255.313ms
I/dex2oat: Explicit concurrent copying GC freed 419(45KB) AllocSpace objects, 0(0B) LOS objects, 32% free, 12MB/18MB, paused 60us total 261.034ms
W/dex2oat: Method processed more than once: void com.package.base.view.BaseFragment.<init>()
W/dex2oat: Method processed more than once: void com.package.base.view.BaseFragment.applyStatusBar(com.package.base.view.BaseFragment$StatusBar)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseFragment.dispatchOnStatusBar()
W/dex2oat: Method processed more than once: void com.package.base.view.BaseFragment.restoreStatusBar(android.app.Activity)
W/dex2oat: Method processed more than once: void com.package.base.view.BaseFragment.saveStatusBar(android.app.Activity)
所有方法似乎都被处理了两次（至少），垃圾收集器似乎做了很多工作。
我不知道发生了什么，但我很想保持这样的速度——现在开发是不可能的。任何人都可以帮忙吗？
额外信息
在 dex2oat 开始这个很长的过程之前，我可以看到以下日志：
W/dex2oat: Unexpected CPU variant for X86 using defaults: x86
W/dex2oat: Mismatch between dex2oat instruction set features (ISA: X86 Feature string: -ssse3,-sse4.1,-sse4.2,-avx,-avx2,-popcnt) and those of dex2oat executable (ISA: X86 Feature string: ssse3,-sse4.1,-sse4.2,-avx,-avx2,-popcnt) for the command line:
W/dex2oat: /system/bin/dex2oat --zip-fd=8 --zip-location=base.apk --input-vdex-fd=-1 --output-vdex-fd=10 --oat-fd=9 --oat-location=/data/app/com.package-7KbZxh8JQyXUOcSGvv-5hA==/oat/x86/base.odex --instruction-set=x86 --instruction-set-variant=x86 --instruction-set-features=default --runtime-arg -Xms64m --runtime-arg -Xmx512m --compiler-filter=quicken --swap-fd=11 --debuggable --classpath-dir=/data/app/com.package-7KbZxh8JQyXUOcSGvv-5hA== --class-loader-context=PCL[]
I/dex2oat: /system/bin/dex2oat --input-vdex-fd=-1 --output-vdex-fd=10 --compiler-filter=quicken --debuggable --classpath-dir=/data/app/com.package-7KbZxh8JQyXUOcSGvv-5hA== --class-loader-context=PCL[]
I/dex2oat: Large app, accepted running with swap.
构建文件
这是build.gradle应用程序模块的一部分。这是一个多模块项目，但其他文件非常相似。
android {
compileSdkVersion(AndroidBuild.compileSdk)
defaultConfig {
applicationId = "com.package"
minSdkVersion(AndroidBuild.minSdk)
targetSdkVersion(AndroidBuild.targetSdk)
versionCode = 7
versionName = "0.2.0"
vectorDrawables.useSupportLibrary = true
renderscriptTargetApi = 24
renderscriptSupportModeEnabled = true
multiDexEnabled = true
testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
testInstrumentationRunnerArgument("clearPackageData", "true")
}
signingConfigs {
create("release") {
// signing stuff
}
}
testOptions {
// execution = "ANDROIDX_TEST_ORCHESTRATOR"
}
buildTypes {
getByName("release") {
signingConfig = signingConfigs.getByName("release")
isShrinkResources = true
isMinifyEnabled = true
proguardFile(getDefaultProguardFile("proguard-defaults.txt"))
proguardFile("proguard-rules.pro")
}
getByName("debug") {
versionNameSuffix = "-debug"
// Hoping that this should speed up builds due to multidexing
defaultConfig.minSdkVersion(21)
}
}
dataBinding.isEnabled = true
compileOptions {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
}
使用 vmSafeMode="true" 时的 aapt 输出
运行时输出./Library/Android/sdk/build-tools/29.0.2/aapt list -a app-debug.apk很大，只粘贴相关部分：
E: application (line=57)
A: android:theme(0x01010000)=@0x7f11014c
A: android:label(0x01010001)=@0x7f100002
A: android:icon(0x01010002)=@0x7f0e0001
A: android:name(0x01010003)="com.package.App" (Raw: "com.package.App")
A: android:debuggable(0x0101000f)=(type 0x12)0xffffffff
A: android:allowBackup(0x01010280)=(type 0x12)0xffffffff
A: android:vmSafeMode(0x010102b8)=(type 0x12)0xffffffff
A: android:supportsRtl(0x010103af)=(type 0x12)0xffffffff
A: android:appComponentFactory(0x0101057a)="androidx.core.app.CoreComponentFactory" (Raw: "androidx.core.app.CoreComponentFactory")