虚幻4中安卓sdk的接入, 可以使用 APL (Android Programming Language) 进行第三方库的接入，首先创建一个NAME_APL.XML 文件，该文件包括了库文件的拷贝、权限的写入、activity java文件的修改和添加等一系列android打包和接口修改的内容。不再需要手动去修改代码或者Java层的文件和代码调用接口。
1.创建一个插件并在插件Source目录下创建一个NAME_APL.XML文件，在该插件模块Name.Build.cs文件中调用如下：
public class PluginModuleName : ModuleRules
{
public PluginModuleNamePluginModuleName(TargetInfo Target)
{
// Additional Frameworks and Libraries for Android
if (Target.Platform == UnrealTargetPlatform.Android)
{
PrivateDependencyModuleNames.AddRange(new string[] { "Launch" });
string PluginPath = Utils.MakePathRelativeTo(ModuleDirectory, BuildConfiguration.RelativeEnginePath);
AdditionalPropertiesForReceipt.Add(new ReceiptProperty("AndroidPlugin", Path.Combine(PluginPath, "NAME_APL.XML")));
}
}
}
2.项目中加载该模块
包含头文件目录， 把插件Type改成Runtime（这个貌似很关键，之前没注意）
PublicIncludePaths.AddRange(
new string[] {
"PluginModuleName/Public",
}
);
PrivateIncludePaths.AddRange(
new string[] {
"PluginModuleName/Private",
}
);
PublicDependencyModuleNames.AddRange(new string[] { "PluginModuleName" });
PrivateIncludePathModuleNames.AddRange(new string[] { "PluginModuleName" });
3.APL_AML中文件结构说明
(1). proguardAdditions,代码混淆
<proguardAdditions>
<insert>
########################################################################################## sdkname
-dontwarn com.sdkname.**
-keep class com.sdkname.** {*;}
</insert>
</proguardAdditions>
(2). prebuildCopies,目录文件拷贝
<prebuildCopies>
<copyDir src="$S(PluginDir)/../../Libs"
dst="$S(BuildDir)" />
</prebuildCopies>
(3). gameActivityImportAdditions,引用插入
<gameActivityImportAdditions>
<insert>
import com.sdkname.*;
import com.sdkname.name.*;
</insert>
</gameActivityImportAdditions>
(4). gameActivityClassAdditions, 成员变量， 函数插入
<gameActivityClassAdditions>
<insert>
private AmazonIapManager AmazonManager;
public void AndroidThunkJava_IapSetupServiceAmazon()
{
Log.debug("[JAVA] - AndroidThunkJava_IapSetupServiceAmazon");
AmazonManager = new AmazonIapManager(this);
final AmazonPurchasingListener amazonPurchasingListener = new AmazonPurchasingListener(AmazonManager);
PurchasingService.registerListener(this.getApplicationContext(), amazonPurchasingListener);
if( AmazonManager == null )
{
Log.debug("[JAVA] - Amazon Manager is invalid");
}
}
</insert>
</gameActivityClassAdditions>
(5). gameActivity[funname]Additions, 在函数中出入内容
<gameActivityOnPauseAdditions>
<insert>
if(gvrLayout != null)
{
gvrLayout.onPause();
}
</insert>
</gameActivityOnPauseAdditions>
(6). resourceCopies, 文件拷贝，指定源和目标
<resourceCopies>
<log text="Copying GoogleVR runtime files to staging" />
<isArch arch="armeabi-v7a">
<copyFile src="$S(EngineDir)/Source/ThirdParty/GoogleVR/lib/android_arm/libgvr.so"
dst="$S(BuildDir)/libs/armeabi-v7a/libgvr.so" />
</resourceCopies>
(7).androidManifestUpdates修改AndroidManifest.xml文件
<androidManifestUpdates>
<!-- Add features -->
<addFeature android:name="android.hardware.sensor.accelerometer" android:required="true" />
<if condition="bSupportDaydream">
<true>
<addFeature android:name="android.hardware.vr.high_performance" android:required="true" />
</true>
<false>
<addFeature android:name="android.hardware.vr.high_performance" android:required="false" />
</false>
</if>
<!-- Add intents -->
<loopElements tag="activity">
<setStringFromAttribute result="activityName" tag="$" name="android:name" />
<setBoolIsEqual result="bGameActivity" arg1="$S(activityName)" arg2="com.epicgames.ue4.GameActivity" />
<if condition="bGameActivity">
<true>
<!-- Check for existing intent filter -->
<setBool result="bHasIntentFilter" value="false" />
<loopElements tag="intent-filter">
<setBool result="bHasIntentFilter" value="true" />
</loopElements>
<!-- If no intent filter found, add a new one -->
<if condition="bHasIntentFilter">
<false>
<setElement result="newIntentFilter" value="intent-filter" />
<addElement tag="$" name="newIntentFilter" />
</false>
</if>
</true>
</if>
</loopElements>
</androidManifestUpdates>
(7). soLoadLibrary， 在GameActivity.java中指定so库先于libUE4.so加载
<soLoadLibrary>
<loadLibrary name="gvr" failmsg="GoogleVR library not loaded and required!" />
</soLoadLibrary>
4.虚幻4中jni的接口调用
if (JNIEnv* Env = FAndroidApplication::GetJavaEnv())
{
// Populate some java types with the provided product information
jobjectArray ProductIDArray = (jobjectArray)Env->NewObjectArray(ProductIds.Num(), FJavaWrapper::JavaStringClass, NULL);
jbooleanArray ConsumeArray = (jbooleanArray)Env->NewBooleanArray(ProductIds.Num());
jboolean* ConsumeArrayValues = Env->GetBooleanArrayElements(ConsumeArray, 0);
for (uint32 Param = 0; Param < ProductIds.Num(); Param++)
{
jstring StringValue = Env->NewStringUTF(TCHAR_TO_UTF8(*ProductIds[Param]));
Env->SetObjectArrayElement(ProductIDArray, Param, StringValue);
Env->DeleteLocalRef(StringValue);
ConsumeArrayValues[Param] = IsConsumableFlags[Param];
}
Env->ReleaseBooleanArrayElements(ConsumeArray, ConsumeArrayValues, 0);
static jmethodID Method = FJavaWrapper::FindMethod(Env, FJavaWrapper::GameActivityClassID, "AndroidThunkJava_IapQueryInAppPurchasesAmazon", "([Ljava/lang/String;[Z)Z", false);
FJavaWrapper::CallBooleanMethod(Env, FJavaWrapper::GameActivityThis, Method, ProductIDArray, ConsumeArray);
// clean up references
Env->DeleteLocalRef(ProductIDArray);
Env->DeleteLocalRef(ConsumeArray);
}
5.虚幻4代码如果需要调用jni, 则必须包含模块 “Launch”
if (Target.Platform == UnrealTargetPlatform.Android)
{
PrivateDependencyModuleNames.AddRange(new string[] { "Launch" });
}
暂时理解到虚幻4的sdk接入流程和内容基本如上。
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