gogio: [Android] add support for querying apps

Previously, it was impossible to identify if a specific app
was installed on the user device. It was also impossible to
launch a external app from Gio using Intent.

Now, you can use `-queries` with a comma separed package names,
like `com.another.app`. That allows you to launch Intent to
`com.another.app`.

Signed-off-by: inkeliz <inkeliz@inkeliz.com>

gogio/androidbuild.go

@@ -40,15 +40,16 @@ type errWriter struct {
 var exeSuffix string
 
 type manifestData struct {
-	AppID       string
-	Version     Semver
-	MinSDK      int
-	TargetSDK   int
-	Permissions []string
-	Features    []string
-	IconSnip    string
-	AppName     string
-	Schemes     []string
+	AppID          string
+	Version        Semver
+	MinSDK         int
+	TargetSDK      int
+	Permissions    []string
+	Features       []string
+	IconSnip       string
+	AppName        string
+	Schemes        []string
+	PackageQueries []string
 }
 
 const (
@@ -435,15 +436,16 @@ func exeAndroid(tmpDir string, tools *androidTools, bi *buildInfo, extraJars, pe
 	permissions, features := getPermissions(perms)
 	appName := UppercaseName(bi.name)
 	manifestSrc := manifestData{
-		AppID:       bi.appID,
-		Version:     bi.version,
-		MinSDK:      minSDK,
-		TargetSDK:   targetSDK,
-		Permissions: permissions,
-		Features:    features,
-		IconSnip:    iconSnip,
-		AppName:     appName,
-		Schemes:     bi.schemes,
+		AppID:          bi.appID,
+		Version:        bi.version,
+		MinSDK:         minSDK,
+		TargetSDK:      targetSDK,
+		Permissions:    permissions,
+		Features:       features,
+		IconSnip:       iconSnip,
+		AppName:        appName,
+		Schemes:        bi.schemes,
+		PackageQueries: bi.packageQueries,
 	}
 	tmpl, err := template.New("test").Parse(
 		`<?xml version="1.0" encoding="utf-8"?>
@@ -451,6 +453,13 @@ func exeAndroid(tmpDir string, tools *androidTools, bi *buildInfo, extraJars, pe
 	package="{{.AppID}}"
 	android:versionCode="{{.Version.VersionCode}}"
 	android:versionName="{{.Version}}">
+	{{if .PackageQueries}}
+ 	<queries>
+	    {{range .PackageQueries}}
+        <package android:name="{{.}}" />
+        {{end}}
+    </queries>
+	{{end}}
 	<uses-sdk android:minSdkVersion="{{.MinSDK}}" android:targetSdkVersion="{{.TargetSDK}}" />
 {{range .Permissions}}	<uses-permission android:name="{{.}}"/>
 {{end}}{{range .Features}}	<uses-feature android:{{.}} android:required="false"/>

gogio/build_info.go

@@ -32,6 +32,7 @@ type buildInfo struct {
 	notaryPassword string
 	notaryTeamID   string
 	schemes        []string
+	packageQueries []string
 }
 
 type Semver struct {
@@ -80,6 +81,7 @@ func newBuildInfo(pkgPath string) (*buildInfo, error) {
 		notaryPassword: *notaryPass,
 		notaryTeamID:   *notaryTeamID,
 		schemes:        getCommaList(*schemes),
+		packageQueries: getCommaList(*pkgQueries),
 	}
 	return bi, nil
 }

gogio/help.go

@@ -88,4 +88,8 @@ The -schemes flag specifies a list of comma separated URI schemes that the progr
 handle. For example, use -schemes yourAppName to receive a app.URLEvent for URIs 
 starting with yourAppName://. It is only supported on Android, iOS, macOS and Windows. 
 On Windows, it will restrict the program to a single instance.
+
+The -queries flag specifies a list of comma separated package names used to query other apps,
+that is useful to launch other apps and verify their presence. For example, use -queries 
+com.example.otherapp to query the app with that package name. It is only necessary on Android.
 `

gogio/main.go

@@ -42,6 +42,7 @@ var (
 	notaryPass    = flag.String("notarypass", "", "specify app-specific password of the Apple ID to be used for notarization.")
 	notaryTeamID  = flag.String("notaryteamid", "", "specify the team id to use for notarization.")
 	schemes       = flag.String("schemes", "", "specify a list of comma separated URL schemes that the program accepts")
+	pkgQueries    = flag.String("queries", "", "specify a list of comma separated package names used to query other apps on Android.")
 )
 
 func main() {