ResourceRemapping.kt
/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.privacysandbox.sdkruntime.client.loader
import androidx.privacysandbox.sdkruntime.client.config.ResourceRemappingConfig
/**
* Update RPackage.packageId for supporting Android Resource remapping for SDK.
* Each resource has id calculated as id = RPackage.packageId + index.
* Updating packageId effectively shifting all SDK resource ids in resource table.
* IMPORTANT: ResourceRemapping should happen before ANY interactions with R.class
*/
internal object ResourceRemapping {
private const val PACKAGE_ID_FIELD_NAME = "packageId"
fun apply(
sdkClassLoader: ClassLoader,
remappingConfig: ResourceRemappingConfig?
) {
if (remappingConfig == null)
return
val rPackageClass = Class.forName(
remappingConfig.rPackageClassName,
/* initialize = */ false,
sdkClassLoader
)
val field = rPackageClass.getDeclaredField(PACKAGE_ID_FIELD_NAME)
field.setInt(null, remappingConfig.packageId)
}
}