1.開啓gradle單獨的守護進程
- /home/<username>/.gradle/ (Linux)
- /Users/<username>/.gradle/ (Mac)
- C:\Users\<username>\.gradle (Windows)
- 把下面配置複製gradle.properties文件也可以優化：
# Project-wide Gradle settings.
# IDE (e.g. Android Studio) users:
# Settings specified in this file will override any Gradle settings
# configured through the IDE.
# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
# The Gradle daemon aims to improve the startup and execution time of Gradle.
# When set to true the Gradle daemon is to run the build.
# TODO: disable daemon on CI, since builds should be clean and reliable on servers
org.gradle.daemon=true
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
# Default value: -Xmx10248m -XX:MaxPermSize=256m
org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
org.gradle.parallel=true
# Enables new incubating mode that makes Gradle selective when configuring projects.
# Only relevant projects are configured which results in faster builds for large multi-projects.
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:configuration_on_demand
org.gradle.configureondemand=true
同時上面的這些參數也可以配置到前面的用戶目錄下的gradle.properties文件裏，那樣就不是針對一個項目生效，而是針對所有項目生效。
上面的配置文件主要就是做， 增大gradle運行的java虛擬機的大小，讓gradle在編譯的時候使用獨立進程，讓gradle可以平行的運行。
2.申請大內存
installation path\studio64.exe.vmoptions or studio.exe.vmoptions
使用文本編輯器打開，找到起始兩行，如下
-Xms128m
-Xmx750m
修改最小值和最大值，建議爲
-Xms256m
-Xmx2048m
2 優化編譯
file->setting->compile
勾選除第二項之外的其他選項，並在VM options裏填入：
-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
經過測試，編譯速度有很大提升，比較大的項目從之前的5-8分鐘可以減少到1-2分鐘。