Updated example to not use native activity anymore

examples/android/android-simple/app/build.gradle

@@ -1,4 +1,6 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
 Properties properties = new Properties()
 properties.load(project.rootProject.file('local.properties').newDataInputStream())
@@ -6,12 +8,13 @@ def ndkDir = properties.getProperty('ndk.dir')
 def valLayerBinDir = "${ndkDir}/sources/third_party/vulkan/src/build-android/jniLibs"
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 29
+    ndkVersion '21.2.6472646'
 
     defaultConfig {
         applicationId "com.ethicalml.kompute.examples.android"
         minSdkVersion 26
-        targetSdkVersion 26
+        targetSdkVersion 29
         versionCode = 1
         versionName = "0.0.1"
         externalNativeBuild {
@@ -26,29 +29,57 @@ android {
             }
         }
     }
+
+    buildFeatures {
+        viewBinding true
+    }
+    buildTypes {
+        release {
+             minifyEnabled = false
+             proguardFiles getDefaultProguardFile('proguard-android.txt'),
+                     'proguard-rules.pro'
+        }
+     }
     externalNativeBuild {
         cmake {
-            path 'src/main/jni/CMakeLists.txt'
+            path 'src/main/cpp/CMakeLists.txt'
         }
     }
 
     sourceSets {
         main {
             jniLibs {
-              // Must have ndk-r12 or better which including layer binaries
-              srcDirs = ["${valLayerBinDir}"]
+                // Must have ndk-r12 or better which including layer binaries
+                srcDirs = ["${valLayerBinDir}"]
             }
         }
     }
 
-    buildTypes {
-        release {
-             minifyEnabled = false
-             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+    flavorDimensions 'cpuArch'
+    productFlavors {
+        arm8 {
+            dimension 'cpuArch'
+            ndk {
+                abiFilters 'arm64-v8a', 'armeabi-v7a'
+            }
         }
-     }
+        x86_64 {
+            dimension 'cpuArch'
+            ndk {
+                abiFilters 'x86_64', 'x86'
+            }
+        }
+        universal {
+            dimension 'cpuArch'
+            // include all default ABIs. with NDK-r16,  it is:
+            //   armeabi-v7a, arm64-v8a, x86, x86_64
+        }
+    }
 }
 
 dependencies {
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 }