add library module and fix gradle files

api/.gitignore

@@ -0,0 +1 @@
+/build

api/build.gradle

@@ -0,0 +1,51 @@
+plugins {
+    id 'com.android.library'
+    id 'maven-publish'
+}
+
+group = 'com.github.BLuFeNiX'
+version = '1.0'
+
+android {
+    namespace 'net.blufenix.smtshell.api'
+    compileSdk 33
+
+    defaultConfig {
+        minSdk 28
+        targetSdk 33
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+}
+
+afterEvaluate {
+    publishing {
+        publications {
+            // Creates a Maven publication called "release".
+            release(MavenPublication) {
+                from components.release
+                groupId = 'com.github.BLuFeNiX'
+                artifactId = 'SMTShell-API'
+                version = '1.0'
+            }
+        }
+    }
+}

api/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

api/src/androidTest/java/net/blufenix/smtshell/api/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package net.blufenix.smtshell.api;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("net.blufenix.smtshell.api.test", appContext.getPackageName());
+    }
+}

api/src/main/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

api/src/test/java/net/blufenix/smtshell/api/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package net.blufenix.smtshell.api;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}

build.gradle

@@ -1,5 +1,21 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-plugins {
-    id 'com.android.application' version '7.4.2' apply false
-    id 'com.android.library' version '7.4.2' apply false
-}
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:4.2.2'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+        maven { url "https://jitpack.io" }
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

settings.gradle

@@ -1,16 +1 @@
-pluginManagement {
-    repositories {
-        google()
-        mavenCentral()
-        gradlePluginPortal()
-    }
-}
-dependencyResolutionManagement {
-    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
-    repositories {
-        google()
-        mavenCentral()
-    }
-}
-rootProject.name = "SMTShell-API"
-include ':app'
+include ':api'