Gradle upgrades and fixes

app/build.gradle

@@ -1,12 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 28
-    buildToolsVersion '26.0.2'
+    compileSdkVersion 30
+    buildToolsVersion '30.0.2'
     defaultConfig {
         applicationId "com.example.iris.login1"
         minSdkVersion 15
-        targetSdkVersion 22
+        targetSdkVersion 30
         versionCode 1
 
         //Previous was 1.7.5.7 => 1.7.5.6
@@ -76,13 +76,13 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:23.4.0'
-    compile 'com.android.support:appcompat-v7:23.4.0'
+    //noinspection GradleCompatible
+    implementation 'com.android.support:appcompat-v7:28.0.0'
     //compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha4'
-    testCompile 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.13.2'
 
 }

build.gradle

@@ -2,12 +2,12 @@
 
 buildscript {
     repositories {
-        jcenter()
         google()
+        mavenCentral()
     }
     dependencies {
 
-        classpath 'com.android.tools.build:gradle:4.2.2'
+        classpath 'com.android.tools.build:gradle:7.0.4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -16,8 +16,8 @@ buildscript {
 
 allprojects {
     repositories {
-        jcenter()
         google()
+        mavenCentral()
     }
 }
 

gradle.properties

@@ -9,8 +9,7 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
-org.gradle.jvmargs=-Xmx1536m
-
+org.gradle.jvmargs=-Xmx4608m
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects