Separate modules for API docs and API stubs

frameworks/base/Android.bp became too big. Modularize it into multiple
files for better readability and extensibility.

droidstubs and java_library modules for API stub libraries are moved to
StubLibraries.bp.

droidstubs and droiddoc modules for API documents are moved to
ApiDocs.bp

Also, added some documentation to explain the roles of the many modules
and how they are related with each other.

Bug: N/A
Test: m

Exempt-From-Owner-Approval: cherry-pick from internal

Merged-In: I285e8c82078d5bd3ed85b0343db2f6375ce7ffb7
(cherry picked from commit 0d7e86d03c8443cee90096ff0447fd50541d77c3)
Change-Id: I285e8c82078d5bd3ed85b0343db2f6375ce7ffb7
diff --git a/ApiDocs.bp b/ApiDocs.bp
new file mode 100644
index 0000000..e373db6
--- /dev/null
+++ b/ApiDocs.bp
@@ -0,0 +1,436 @@
+// Copyright (C) 2019 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.
+
+// How API docs are generated:
+//
+// raw source files --(metalava)--> stub source files --(doclava)--> API doc
+//
+// The metalava conversion is done by droidstub modules framework-doc-*-stubs.
+// The API doc generation is done by the various droiddoc modules each of which
+// is for different format.
+
+/////////////////////////////////////////////////////////////////////
+// stub source files are generated using metalava
+/////////////////////////////////////////////////////////////////////
+
+framework_docs_only_libs = [
+    "voip-common",
+    "android.test.mock",
+    "android-support-annotations",
+    "android-support-compat",
+    "android-support-core-ui",
+    "android-support-core-utils",
+    "android-support-design",
+    "android-support-dynamic-animation",
+    "android-support-exifinterface",
+    "android-support-fragment",
+    "android-support-media-compat",
+    "android-support-percent",
+    "android-support-transition",
+    "android-support-v7-cardview",
+    "android-support-v7-gridlayout",
+    "android-support-v7-mediarouter",
+    "android-support-v7-palette",
+    "android-support-v7-preference",
+    "android-support-v13",
+    "android-support-v14-preference",
+    "android-support-v17-leanback",
+    "android-support-vectordrawable",
+    "android-support-animatedvectordrawable",
+    "android-support-v7-appcompat",
+    "android-support-v7-recyclerview",
+    "android-support-v8-renderscript",
+    "android-support-multidex",
+    "android-support-multidex-instrumentation",
+]
+
+stubs_defaults {
+    name: "framework-doc-stubs-default",
+    srcs: [
+        ":framework-mime-sources",
+        ":framework-non-updatable-sources",
+        ":framework-updatable-sources",
+        "core/java/**/*.logtags",
+        "test-base/src/**/*.java",
+        ":opt-telephony-srcs",
+        ":opt-net-voip-srcs",
+        ":core-current-stubs-source",
+        ":core_public_api_files",
+        "test-mock/src/**/*.java",
+        "test-runner/src/**/*.java",
+    ],
+    libs: framework_docs_only_libs,
+    create_doc_stubs: true,
+    annotations_enabled: true,
+    api_levels_annotations_enabled: true,
+    api_levels_annotations_dirs: [
+        "sdk-dir",
+        "api-versions-jars-dir",
+    ],
+    previous_api: ":last-released-public-api",
+    merge_annotations_dirs: [
+        "metalava-manual",
+    ],
+}
+
+droidstubs {
+    name: "framework-doc-stubs",
+    defaults: ["framework-doc-stubs-default"],
+    arg_files: [
+        "core/res/AndroidManifest.xml",
+    ],
+    args: metalava_framework_docs_args,
+    write_sdk_values: true,
+}
+
+droidstubs {
+    name: "framework-doc-system-stubs",
+    defaults: ["framework-doc-stubs-default"],
+    arg_files: [
+        "core/res/AndroidManifest.xml",
+    ],
+    args: metalava_framework_docs_args + " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS,process=android.annotation.SystemApi.Process.ALL\\) ",
+    write_sdk_values: true,
+}
+
+/////////////////////////////////////////////////////////////////////
+// API docs are created from the generated stub source files
+// using droiddoc
+/////////////////////////////////////////////////////////////////////
+
+framework_docs_only_args = " -android -manifest $(location core/res/AndroidManifest.xml) " +
+    "-werror -lerror -hide 111 -hide 113 -hide 125 -hide 126 -hide 127 -hide 128 " +
+    "-overview $(location core/java/overview.html) " +
+    // Federate Support Library references against local API file.
+    "-federate SupportLib https://developer.android.com " +
+    "-federationapi SupportLib $(location :current-support-api) " +
+    // Federate Support Library references against local API file.
+    "-federate AndroidX https://developer.android.com " +
+    "-federationapi AndroidX $(location :current-androidx-api) "
+
+doc_defaults {
+    name: "framework-docs-default",
+    libs: framework_docs_only_libs +
+        ["stub-annotations"],
+    html_dirs: [
+        "docs/html",
+    ],
+    knowntags: [
+        "docs/knowntags.txt",
+        ":known-oj-tags",
+    ],
+    custom_template: "droiddoc-templates-sdk",
+    resourcesdir: "docs/html/reference/images/",
+    resourcesoutdir: "reference/android/images/",
+    hdf: [
+        "dac true",
+        "sdk.codename O",
+        "sdk.preview.version 1",
+        "sdk.version 7.0",
+        "sdk.rel.id 1",
+        "sdk.preview 0",
+    ],
+    arg_files: [
+        "core/res/AndroidManifest.xml",
+        "core/java/overview.html",
+        ":current-support-api",
+        ":current-androidx-api",
+    ],
+    create_stubs: false,
+}
+
+doc_defaults {
+    name: "framework-dokka-docs-default",
+    create_stubs: false,
+}
+
+droiddoc {
+    name: "doc-comment-check-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    args: framework_docs_only_args + " -referenceonly -parsecomments",
+    installable: false,
+}
+
+droiddoc {
+    name: "offline-sdk-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    hdf: [
+        "android.whichdoc offline",
+    ],
+    proofread_file: "offline-sdk-docs-proofrerad.txt",
+    args: framework_docs_only_args + " -offlinemode -title \"Android SDK\"",
+    static_doc_index_redirect: "docs/docs-preview-index.html",
+}
+
+droiddoc {
+    // Please sync with android-api-council@ before making any changes for the name property below.
+    // Since there's cron jobs that fetch offline-sdk-referenceonly-docs-docs.zip periodically.
+    // See b/116221385 for reference.
+    name: "offline-sdk-referenceonly-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    hdf: [
+        "android.whichdoc offline",
+    ],
+    proofread_file: "offline-sdk-referenceonly-docs-proofrerad.txt",
+    args: framework_docs_only_args + " -offlinemode -title \"Android SDK\" -referenceonly",
+    static_doc_index_redirect: "docs/docs-documentation-redirect.html",
+    static_doc_properties: "docs/source.properties",
+}
+
+droiddoc {
+    // Please sync with android-api-council@ before making any changes for the name property below.
+    // Since there's cron jobs that fetch offline-system-sdk-referenceonly-docs-docs.zip periodically.
+    // See b/116221385 for reference.
+    name: "offline-system-sdk-referenceonly-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-system-stubs",
+    ],
+    hdf: [
+        "android.whichdoc offline",
+    ],
+    proofread_file: "offline-system-sdk-referenceonly-docs-proofrerad.txt",
+    args: framework_docs_only_args + " -hide 101 -hide 104 -hide 108" +
+    " -offlinemode -title \"Android System SDK\" -referenceonly",
+    static_doc_index_redirect: "docs/docs-documentation-redirect.html",
+    static_doc_properties: "docs/source.properties",
+}
+
+droiddoc {
+    name: "online-sdk-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    hdf: [
+        "android.whichdoc online",
+        "android.hasSamples true",
+    ],
+    proofread_file: "online-sdk-docs-proofrerad.txt",
+    args: framework_docs_only_args +
+        " -toroot / -samplegroup Admin " +
+        " -samplegroup Background " +
+        " -samplegroup Connectivity " +
+        " -samplegroup Content " +
+        " -samplegroup Input " +
+        " -samplegroup Media " +
+        " -samplegroup Notification " +
+        " -samplegroup RenderScript " +
+        " -samplegroup Security " +
+        " -samplegroup Sensors " +
+        " -samplegroup System " +
+        " -samplegroup Testing " +
+        " -samplegroup UI " +
+        " -samplegroup Views " +
+        " -samplegroup Wearable -samplesdir development/samples/browseable ",
+}
+
+droiddoc {
+    name: "online-system-api-sdk-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-system-stubs",
+    ],
+    hdf: [
+        "android.whichdoc online",
+        "android.hasSamples true",
+    ],
+    proofread_file: "online-system-api-sdk-docs-proofrerad.txt",
+    args: framework_docs_only_args +
+        " -referenceonly " +
+        " -title \"Android SDK - Including system APIs.\" " +
+        " -hide 101 " +
+        " -hide 104 " +
+        " -hide 108 " +
+        " -toroot / -samplegroup Admin " +
+        " -samplegroup Background " +
+        " -samplegroup Connectivity " +
+        " -samplegroup Content " +
+        " -samplegroup Input " +
+        " -samplegroup Media " +
+        " -samplegroup Notification " +
+        " -samplegroup RenderScript " +
+        " -samplegroup Security " +
+        " -samplegroup Sensors " +
+        " -samplegroup System " +
+        " -samplegroup Testing " +
+        " -samplegroup UI " +
+        " -samplegroup Views " +
+        " -samplegroup Wearable -samplesdir development/samples/browseable ",
+    installable: false,
+}
+
+droiddoc {
+    name: "ds-docs-java",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    hdf: [
+        "android.whichdoc online",
+        "android.hasSamples true",
+    ],
+    proofread_file: "ds-docs-proofrerad.txt",
+    args: framework_docs_only_args +
+        " -toroot / -yamlV2 -metalavaApiSince -samplegroup Admin " +
+        " -samplegroup Background " +
+        " -samplegroup Connectivity " +
+        " -samplegroup Content " +
+        " -samplegroup Input " +
+        " -samplegroup Media " +
+        " -samplegroup Notification " +
+        " -samplegroup RenderScript " +
+        " -samplegroup Security " +
+        " -samplegroup Sensors " +
+        " -samplegroup System " +
+        " -samplegroup Testing " +
+        " -samplegroup UI " +
+        " -samplegroup Views " +
+        " -samplegroup Wearable -devsite -samplesdir development/samples/browseable ",
+}
+
+droiddoc {
+    name: "ds-docs-kt",
+    defaults: ["framework-dokka-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    args: "-noJdkLink -links https://kotlinlang.org/api/latest/jvm/stdlib/^external/dokka/package-list " +
+    "-noStdlibLink",
+    proofread_file: "ds-dokka-proofread.txt",
+    dokka_enabled: true,
+}
+
+java_genrule {
+    name: "ds-docs",
+    tools: [
+        "zip2zip",
+        "merge_zips",
+    ],
+    srcs: [
+        ":ds-docs-java{.docs.zip}",
+        ":ds-docs-kt{.docs.zip}",
+    ],
+    out: ["ds-docs.zip"],
+    dist: {
+        targets: ["docs"],
+    },
+    cmd: "$(location zip2zip) -i $(location :ds-docs-kt{.docs.zip}) -o $(genDir)/ds-docs-kt-moved.zip **/*:en/reference/kotlin && " +
+         "$(location merge_zips) $(out) $(location :ds-docs-java{.docs.zip}) $(genDir)/ds-docs-kt-moved.zip",
+}
+
+java_genrule {
+    name: "ds-docs-switched",
+    tools: [
+        "switcher4",
+        "soong_zip",
+    ],
+    srcs: [
+        ":ds-docs-java{.docs.zip}",
+        ":ds-docs-kt{.docs.zip}",
+    ],
+    out: ["ds-docs-switched.zip"],
+    dist: {
+        targets: ["docs"],
+    },
+    cmd: "unzip $(location :ds-docs-java{.docs.zip}) -d $(genDir) && " +
+         "unzip $(location :ds-docs-kt{.docs.zip}) -d $(genDir)/en/reference/kotlin && " +
+         "SWITCHER=$$(cd $$(dirname $(location switcher4)) && pwd)/$$(basename $(location switcher4)) && " +
+         "(cd $(genDir)/en/reference && $$SWITCHER --work platform) && " +
+         "$(location soong_zip) -o $(out) -C $(genDir) -D $(genDir)",
+}
+
+droiddoc {
+    name: "ds-static-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    hdf: [
+        "android.whichdoc online",
+    ],
+    proofread_file: "ds-static-docs-proofrerad.txt",
+    args: framework_docs_only_args +
+        " -staticonly " +
+        " -toroot / " +
+        " -devsite " +
+        " -ignoreJdLinks ",
+}
+
+droiddoc {
+    name: "ds-ref-navtree-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    hdf: [
+        "android.whichdoc online",
+    ],
+    proofread_file: "ds-ref-navtree-docs-proofrerad.txt",
+    args: framework_docs_only_args +
+        " -toroot / " +
+        " -atLinksNavtree " +
+        " -navtreeonly ",
+}
+
+droiddoc {
+    name: "online-sdk-dev-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    hdf: [
+        "android.whichdoc online",
+        "android.hasSamples true",
+    ],
+    proofread_file: "online-sdk-dev-docs-proofrerad.txt",
+    args: framework_docs_only_args +
+        " -toroot / -samplegroup Admin " +
+        " -samplegroup Background " +
+        " -samplegroup Connectivity " +
+        " -samplegroup Content " +
+        " -samplegroup Input " +
+        " -samplegroup Media " +
+        " -samplegroup Notification " +
+        " -samplegroup RenderScript " +
+        " -samplegroup Security " +
+        " -samplegroup Sensors " +
+        " -samplegroup System " +
+        " -samplegroup Testing " +
+        " -samplegroup UI " +
+        " -samplegroup Views " +
+        " -samplegroup Wearable -samplesdir development/samples/browseable ",
+}
+
+droiddoc {
+    name: "hidden-docs",
+    defaults: ["framework-docs-default"],
+    srcs: [
+        ":framework-doc-stubs",
+    ],
+    proofread_file: "hidden-docs-proofrerad.txt",
+    args: framework_docs_only_args +
+        " -referenceonly " +
+        " -title \"Android SDK - Including hidden APIs.\"",
+}
+