Remove unnecessary attributes.

build.gradle

@@ -1,29 +1,18 @@
-subprojects {
-  repositories {
-    mavenCentral()
-  }
+
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+        maven { url 'https://plugins.gradle.org/m2/' }
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:4.2.1'
+    }
 }
+
 allprojects {
     repositories {
         mavenCentral()
-        jcenter()
-        maven {
-            url "https://maven.google.com"
-        }
-    }
-}
-buildscript {
-    repositories {
-        mavenCentral()
-        maven {
-            url 'https://maven.google.com/'
-            name 'Google'
-        }
-        google()
-        jcenter()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.2'
-        classpath 'com.novoda:bintray-release:0.9.1'
+        maven { url 'https://plugins.gradle.org/m2/' }
     }
 }

graphenej/build.gradle

@@ -1,37 +1,16 @@
-apply plugin: 'com.novoda.bintray-release'
 apply plugin: 'com.android.library'
 
-publish {
-    userOrg = 'bilthon'
-    groupId = 'cy.agorise.graphenej'
-    artifactId = 'graphenej'
-    publishVersion = '0.6.0'
-    repoName = 'Graphenej'
-    desc = 'A Java library for mobile app Developers; Graphene/Bitshares blockchain.'
-    website = 'https://github.com/Agorise/graphenej'
-}
-
 android {
-    compileSdkVersion 28
+    compileSdkVersion 29
 
     defaultConfig {
         minSdkVersion 14
-        targetSdkVersion 28
-        versionCode 12
-        versionName "0.6.0"
+        targetSdkVersion 29
         vectorDrawables.useSupportLibrary = true
     }
-    buildTypes {
-        debug{}
-        preRelease{}
-        release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
-        }
-    }
+
     defaultConfig {
         multiDexEnabled true
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
 }
 
@@ -39,16 +18,16 @@ dependencies {
     testImplementation group: 'junit', name: 'junit', version: '4.12'
     implementation 'com.neovisionaries:nv-websocket-client:1.30'
     implementation 'org.bitcoinj:bitcoinj-core:0.14.3'
-    implementation 'com.google.code.gson:gson:2.8.5'
-    implementation 'org.tukaani:xz:1.6'
+    implementation 'com.google.code.gson:gson:2.8.6'
+    implementation 'org.tukaani:xz:1.9'
+
+    //  Rx dependencies
+    api 'io.reactivex.rxjava2:rxandroid:2.1.1'
+    api 'io.reactivex.rxjava2:rxjava:2.2.10'
+    api 'com.jakewharton.rxrelay2:rxrelay:2.1.0'
+    api 'com.squareup.okhttp3:okhttp:4.2.0'
 
     androidTestImplementation 'com.android.support:support-annotations:28.0.0'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test:rules:1.0.2'
-
-    //  Rx dependencies
-    api 'io.reactivex.rxjava2:rxandroid:2.1.0'
-    api 'io.reactivex.rxjava2:rxjava:2.2.2'
-    api 'com.jakewharton.rxrelay2:rxrelay:2.1.0'
-    api 'com.squareup.okhttp3:okhttp:3.12.2'
 }

graphenej/src/androidTest/java/cy/agorise/graphenej/NodeLatencyVerifierTest.java

@@ -1,8 +1,9 @@
 package cy.agorise.graphenej;
 
-import android.support.test.runner.AndroidJUnit4;
 import android.util.Log;
 
+import androidx.test.runner.AndroidJUnit4;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;