Unity打包代码修改gradle.properties或AndroidManifest文件

Unity通过Gradle打包方式会自动生成对应的gradle相关文件，再进行打包，虽然编辑器可以设置一部分参数，但是因为Unity版本不同，参数支持可能不够。

以Unity2018.4.17为例

仅支持设置部分路径，如需设置gradle版本，并没有地方设置。

 对于这种情况，其实Unity可以通过IPostGenerateGradleAndroidProject进行设置，不需要升级Unity版本。

比如我们可以这样修改打包后的gradle.properties文件，打包完后修改部分参数，再让Unity自动进行打包apk

public class AndroidPostBuildProcessor : IPostGenerateGradleAndroidProject
{public int callbackOrder{get{return 999;}}void IPostGenerateGradleAndroidProject.OnPostGenerateGradleAndroidProject(string path){Debug.Log("Bulid path : " + path);string gradlePropertiesFile = path + "/gradle.properties";if (File.Exists(gradlePropertiesFile)){File.Delete(gradlePropertiesFile);}StreamWriter writer = File.CreateText(gradlePropertiesFile);writer.WriteLine("org.gradle.jvmargs=-Xmx4096M");writer.WriteLine("android.useAndroidX=true");writer.WriteLine("android.enableJetifier=true");writer.Flush();writer.Close();}
}

甚至我们可以打包后修改AndroidManfiest文件

using System.Xml;
using UnityEditor;
using UnityEditor.Android;
using UnityEditor.XR.Oculus;#if UNITY_ANDROID
internal class OculusManifestBTFixer : IPostGenerateGradleAndroidProject {static readonly string k_AndroidURI = "http://schemas.android.com/apk/res/android";static readonly string k_AndroidManifestPath = "/src/main/AndroidManifest.xml";void CreateNameValueElementsInTag(XmlDocument doc, string parentPath, string tag,string firstName, string firstValue, string secondName = null, string secondValue = null, string thirdName = null, string thirdValue = null) {var xmlNodeList = doc.SelectNodes(parentPath + "/" + tag);// don't create if the firstValue matchesforeach (XmlNode node in xmlNodeList) {foreach (XmlAttribute attrib in node.Attributes) {if (attrib.Value == firstValue) {return;}}}XmlElement childElement = doc.CreateElement(tag);childElement.SetAttribute(firstName, k_AndroidURI, firstValue);if (secondValue != null) {childElement.SetAttribute(secondName, k_AndroidURI, secondValue);}if (thirdValue != null) {childElement.SetAttribute(thirdName, k_AndroidURI, thirdValue);}var xmlParentNode = doc.SelectSingleNode(parentPath);if (xmlParentNode != null) {xmlParentNode.AppendChild(childElement);}}public void OnPostGenerateGradleAndroidProject(string path) {if (!OculusBuildTools.OculusLoaderPresentInSettingsForBuildTarget(BuildTargetGroup.Android))return;var manifestPath = path + k_AndroidManifestPath;var manifestDoc = new XmlDocument();manifestDoc.Load(manifestPath);string nodePath = "/manifest";CreateNameValueElementsInTag(manifestDoc, nodePath, "uses-permission", "name", "android.permission.BLUETOOTH");manifestDoc.Save(manifestPath);}public int callbackOrder { get { return 20000; } }
}
#endif

参考链接：

android - Is there a way to change the gradle.properties file in Unity - Stack Overflow

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