优化Android Studio/Gradle构建

使用Android Studio进行开，随着项目的增大，依赖库的增多，构建速度越来越慢，现在最慢要6分钟才能    

build一个release的安装包，在网上查找资料，发现可以通过一些配置可以加快速度，这里跟大家分享一下。

1.  在下面的目录下面创建gradle.properties文件：
    
 C:\Users\<username>\.gradle (Windows)
 /home/<username>/.gradle/ (Linux)
 /Users/<username>/.gradle/ (Mac)

2.  把下面配置复制gradle.properties文件也可以优化：

# 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

installation path\studio64.exe.vmoptions or studio.exe.vmoptions

 使用文本编辑器打开，找到起始两行，如下
-Xms128m
-Xmx750m

修改最小值和最大值，建议为
-Xms256m
-Xmx2048m

 file->setting->compile
 勾选除第二项之外的其他选项，并在VM options里填入：
 -Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8