android: update configuration files:

- remove unsupported hardware platforms
- udpate dependencies and versions of tools

android/build.gradle

@@ -2,9 +2,10 @@ buildscript {
     repositories {
         mavenCentral()
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.2.1'
     }
 }
 
@@ -12,14 +13,17 @@ apply plugin: 'com.android.application'
 
 repositories {
     mavenCentral()
+    jcenter()
+    google()
 }
 
 dependencies {
-    androidTestCompile 'org.hamcrest:hamcrest-all:1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'org.hamcrest:hamcrest-all:1.3'
 }
 
 android {
-    buildToolsVersion '25.0.3'
+    buildToolsVersion '28.0.3'
     compileSdkVersion 26
 
     defaultConfig {

android/jni/Application.mk

@@ -1,4 +1,4 @@
 APP_OPTIM             := release
-APP_PLATFORM          := android-14
+APP_PLATFORM          := android-26
 APP_TOOLCHAIN_VERSION := 4.6.3
-APP_ABI               := mips armeabi armeabi-v7a x86
+APP_ABI               := armeabi-v7a x86