Downgraded to Java 1.8 to comply with fdroid build system

.idea/compiler.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="11" />
+    <bytecodeTargetLevel target="1.8" />
   </component>
 </project>

.idea/misc.xml

@@ -13,5 +13,5 @@
     </option>
   </component>
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="11" project-jdk-type="JavaSDK" />
 </project>

app/build.gradle

@@ -55,15 +55,15 @@ dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
 
     implementation 'com.android.support:design:30.0.1'
-    implementation 'androidx.appcompat:appcompat:1.2.0'
-    implementation 'androidx.recyclerview:recyclerview:1.1.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.recyclerview:recyclerview:1.2.1'
     implementation "androidx.cardview:cardview:1.0.0"
-    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
     implementation "androidx.preference:preference:1.1.1"
 
-    testImplementation 'junit:junit:4.13'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
 
     // Retrofif2
     implementation 'com.squareup.retrofit2:retrofit:2.9.0'

build.gradle

@@ -25,7 +25,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.0.2'
+        classpath 'com.android.tools.build:gradle:4.2.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files