Add support for building android apps

Add support for running aapt to generate R.java and Manifest.java,
compiling java into jar, adding resources to the jar to convert it
into an apk, signing the apk, and zipaligning the apk.

Change-Id: I7a73fef590d07f35b3d0b56a8571780c09bb10ae

java/app_builder.go

@@ -0,0 +1,172 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// 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 java
+
+// This file generates the final rules for compiling all Java.  All properties related to
+// compiling should have been translated into javaBuilderFlags or another argument to the Transform*
+// functions.
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/google/blueprint"
+
+	"android/soong/common"
+)
+
+var (
+	aaptCreateResourceJavaFile = pctx.StaticRule("aaptCreateResourceJavaFile",
+		blueprint.RuleParams{
+			Command: `rm -rf "$javaDir" && mkdir -p "$javaDir" && ` +
+				`$aaptCmd package -m $aaptFlags -P $publicResourcesFile -G $proguardOptionsFile ` +
+				`-J $javaDir || ( rm -rf "$javaDir/*"; exit 41 ) && ` +
+				`find $javaDir -name "*.java" > $javaFileList`,
+			Description: "aapt create R.java $out",
+		},
+		"aaptFlags", "publicResourcesFile", "proguardOptionsFile", "javaDir", "javaFileList")
+
+	aaptCreateAssetsPackage = pctx.StaticRule("aaptCreateAssetsPackage",
+		blueprint.RuleParams{
+			Command:     `$aaptCmd package $aaptFlags -F $out`,
+			Description: "aapt export package $out",
+		},
+		"aaptFlags", "publicResourcesFile", "proguardOptionsFile", "javaDir", "javaFileList")
+
+	aaptAddResources = pctx.StaticRule("aaptAddResources",
+		blueprint.RuleParams{
+			// TODO: add-jni-shared-libs-to-package
+			Command:     `cp -f $in $out.tmp && $aaptCmd package -u $aaptFlags -F $out.tmp && mv $out.tmp $out`,
+			Description: "aapt package $out",
+		},
+		"aaptFlags")
+
+	zipalign = pctx.StaticRule("zipalign",
+		blueprint.RuleParams{
+			Command:     `$zipalignCmd -f $zipalignFlags 4 $in $out`,
+			Description: "zipalign $out",
+		},
+		"zipalignFlags")
+
+	signapk = pctx.StaticRule("signapk",
+		blueprint.RuleParams{
+			Command:     `java -jar $signapkCmd $certificates $in $out`,
+			Description: "signapk $out",
+		},
+		"certificates")
+
+	androidManifestMerger = pctx.StaticRule("androidManifestMerger",
+		blueprint.RuleParams{
+			Command: "java -classpath $androidManifestMergerCmd com.android.manifmerger.Main merge " +
+				"--main $in --libs $libsManifests --out $out",
+			Description: "merge manifest files $out",
+		},
+		"libsManifests")
+)
+
+func init() {
+	pctx.StaticVariable("androidManifestMergerCmd", "${srcDir}/prebuilts/devtools/tools/lib/manifest-merger.jar")
+	pctx.VariableFunc("aaptCmd", func(c interface{}) (string, error) {
+		return c.(common.Config).HostBinTool("aapt")
+	})
+	pctx.VariableFunc("zipalignCmd", func(c interface{}) (string, error) {
+		return c.(common.Config).HostBinTool("zipalign")
+	})
+	pctx.VariableFunc("signapkCmd", func(c interface{}) (string, error) {
+		return c.(common.Config).HostJavaTool("signapk.jar")
+	})
+}
+
+func CreateResourceJavaFiles(ctx common.AndroidModuleContext, flags []string,
+	deps []string) (string, string, string) {
+	javaDir := filepath.Join(common.ModuleGenDir(ctx), "R")
+	javaFileList := filepath.Join(common.ModuleOutDir(ctx), "R.filelist")
+	publicResourcesFile := filepath.Join(common.ModuleOutDir(ctx), "public_resources.xml")
+	proguardOptionsFile := filepath.Join(common.ModuleOutDir(ctx), "proguard.options")
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:      aaptCreateResourceJavaFile,
+		Outputs:   []string{publicResourcesFile, proguardOptionsFile, javaFileList},
+		Implicits: deps,
+		Args: map[string]string{
+			"aaptFlags":           strings.Join(flags, " "),
+			"publicResourcesFile": publicResourcesFile,
+			"proguardOptionsFile": proguardOptionsFile,
+			"javaDir":             javaDir,
+			"javaFileList":        javaFileList,
+		},
+	})
+
+	return publicResourcesFile, proguardOptionsFile, javaFileList
+}
+
+func CreateExportPackage(ctx common.AndroidModuleContext, flags []string, deps []string) string {
+	outputFile := filepath.Join(common.ModuleOutDir(ctx), "package-export.apk")
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:      aaptCreateAssetsPackage,
+		Outputs:   []string{outputFile},
+		Implicits: deps,
+		Args: map[string]string{
+			"aaptFlags": strings.Join(flags, " "),
+		},
+	})
+
+	return outputFile
+}
+
+func CreateAppPackage(ctx common.AndroidModuleContext, flags []string, jarFile string,
+	certificates []string) string {
+
+	resourceApk := filepath.Join(common.ModuleOutDir(ctx), "resources.apk")
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:    aaptAddResources,
+		Outputs: []string{resourceApk},
+		Inputs:  []string{jarFile},
+		Args: map[string]string{
+			"aaptFlags": strings.Join(flags, " "),
+		},
+	})
+
+	signedApk := filepath.Join(common.ModuleOutDir(ctx), "signed.apk")
+
+	var certificateArgs []string
+	for _, c := range certificates {
+		certificateArgs = append(certificateArgs, c+".x509.pem", c+".pk8")
+	}
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:    signapk,
+		Outputs: []string{signedApk},
+		Inputs:  []string{resourceApk},
+		Args: map[string]string{
+			"certificates": strings.Join(certificateArgs, " "),
+		},
+	})
+
+	outputFile := filepath.Join(common.ModuleOutDir(ctx), "package.apk")
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:    zipalign,
+		Outputs: []string{outputFile},
+		Inputs:  []string{signedApk},
+		Args: map[string]string{
+			"zipalignFlags": "",
+		},
+	})
+
+	return outputFile
+}