update android target API to 28, use gradle and ndk parallel building

android/AndroidManifest.xml

@@ -7,7 +7,7 @@
 
     <uses-sdk
         android:minSdkVersion="14"
-        android:targetSdkVersion="25" />
+        android:targetSdkVersion="28" />
 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.INTERNET" /> <!-- normal perm, per https://developer.android.com/guide/topics/permissions/normal-permissions.html -->

android/assets/i2pd.conf

@@ -0,0 +1,78 @@
+## Configuration file for a typical i2pd user
+## See https://i2pd.readthedocs.org/en/latest/configuration.html
+## for more options you can use in this file.
+
+#logfile = /sdcard/i2pd/i2pd.log
+loglevel = none
+
+# host = 1.2.3.4
+# port = 4567
+
+ipv4 = true
+ipv6 = false
+
+# ntcp = true
+# ntcpproxy = http://127.0.0.1:8118
+# ssu = true
+
+bandwidth = O
+# share = 100
+
+# notransit = true
+# floodfill = true
+
+[http]
+enabled = true
+address = 127.0.0.1
+port = 7070
+# auth = true
+# user = i2pd
+# pass = changeme
+
+[httpproxy]
+enabled = true
+address = 127.0.0.1
+port = 4444
+# keys = http-proxy-keys.dat
+# addresshelper = true
+# outproxy = http://false.i2p
+## httpproxy section also accepts I2CP parameters, like "inbound.length" etc.
+
+[socksproxy]
+enabled = true
+address = 127.0.0.1
+port = 4447
+# keys = socks-proxy-keys.dat
+# outproxy.enabled = false
+# outproxy = 127.0.0.1
+# outproxyport = 9050
+## socksproxy section also accepts I2CP parameters, like "inbound.length" etc.
+
+[sam]
+enabled = false
+# address = 127.0.0.1
+# port = 7656
+
+[precomputation]
+elgamal = true
+
+[upnp]
+enabled = true
+# name = I2Pd
+
+[reseed]
+verify = true
+## Path to local reseed data file (.su3) for manual reseeding
+# file = /path/to/i2pseeds.su3
+## or HTTPS URL to reseed from
+# file = https://legit-website.com/i2pseeds.su3
+## Path to local ZIP file or HTTPS URL to reseed from
+# zipfile = /path/to/netDb.zip
+## If you run i2pd behind a proxy server, set proxy server for reseeding here
+## Should be http://address:port or socks://address:port
+# proxy = http://127.0.0.1:8118
+## Minimum number of known routers, below which i2pd triggers reseeding. 25 by default
+# threshold = 25
+
+[limits]
+transittunnels = 50

android/assets/subscriptions.txt

@@ -0,0 +1,3 @@
+http://inr.i2p/export/alive-hosts.txt
+http://stats.i2p/cgi-bin/newhosts.txt
+http://i2p-projekt.i2p/hosts.txt

android/assets/tunnels.conf

@@ -0,0 +1,33 @@
+[IRC-IRC2P]
+#type = client
+#address = 127.0.0.1
+#port = 6668
+#destination = irc.postman.i2p
+#destinationport = 6667
+#keys = irc-keys.dat
+
+#[IRC-ILITA]
+#type = client
+#address = 127.0.0.1
+#port = 6669
+#destination = irc.ilita.i2p
+#destinationport = 6667
+#keys = irc-keys.dat
+
+#[SMTP]
+#type = client
+#address = 127.0.0.1
+#port = 7659
+#destination = smtp.postman.i2p
+#destinationport = 25
+#keys = smtp-keys.dat
+
+#[POP3]
+#type = client
+#address = 127.0.0.1
+#port = 7660
+#destination = pop.postman.i2p
+#destinationport = 110
+#keys = pop3-keys.dat
+
+# see more examples at https://i2pd.readthedocs.io/en/latest/user-guide/tunnels/

android/build.gradle

@@ -18,17 +18,22 @@ repositories {
 }
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.3"
+    compileSdkVersion 28
+    buildToolsVersion "28.0.1"
     defaultConfig {
         applicationId "org.purplei2p.i2pd"
-        targetSdkVersion 25
+        targetSdkVersion 28
         minSdkVersion 14
         versionCode 1
         versionName "2.19.0"
         ndk {
             abiFilters 'armeabi-v7a'
-            //abiFilters 'x86'
+            abiFilters 'x86'
+        }
+        externalNativeBuild {
+            ndkBuild {
+                arguments "-j4"
+            }
         }
     }
     sourceSets {

android/gradle.properties

@@ -0,0 +1 @@
+org.gradle.parallel=true

android/project.properties

@@ -11,4 +11,4 @@
 #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
 
 # Project target.
-target=android-25
+target=android-28

android/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = "i2pd"