Automate versionName

MPChartExample/build.gradle

@@ -9,8 +9,8 @@ android {
         applicationId "com.xxmassdeveloper.mpchartexample"
         minSdkVersion 19
         targetSdkVersion 33
-        versionCode 57
-        versionName '3.1.0'
+        versionCode getGitCommitCount()
+        versionName getTag()
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         testInstrumentationRunnerArguments useTestStorageService: 'true'
     }

MPChartLib/build.gradle

@@ -9,6 +9,10 @@ android {
         minSdkVersion 19
         targetSdkVersion 33
 
+        // VERSION_NAME no longer available as of 4.1
+        // https://issuetracker.google.com/issues/158695880
+        buildConfigField 'String', 'VERSION_NAME', "\"${getTag()}\""
+
         consumerProguardFiles 'proguard-project.txt'
     }
     buildTypes {

build.gradle

@@ -18,3 +18,15 @@ allprojects {
         mavenCentral()
     }
 }
+
+@SuppressWarnings('unused')
+static def getTag() {
+    def process = "git describe --tags --abbrev=0".execute()
+    return process.text.toString().trim()
+}
+
+@SuppressWarnings('unused')
+static def getGitCommitCount() {
+    def process = "git rev-list HEAD --count".execute()
+    return process.text.toInteger()
+}