Get the project syncing and building again.

app/build.gradle

@@ -5,22 +5,22 @@ android {
     namespace "com.hyperling.apps.the45minuterule"
     defaultConfig {
         applicationId "com.hyperling.apps.the45minuterule"
-        minSdkVersion 14
+        minSdkVersion 23
         targetSdkVersion 36
-        versionCode 8
-        versionName "1.07"
+        versionCode 9
+        versionName "1.0.8"
     }
     buildTypes {
         release {
             minifyEnabled true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
 }
 
 dependencies {
     //compile fileTree(dir: 'libs', include: ['*.jar'])
-    implementation fileTree(dir: 'libs', include: ['*.jar'])
-    testImplementation 'junit:junit:4.12'
-    implementation group: 'com.android.support', name: 'appcompat-v7', version: '28.0.0'
+    //implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation 'junit:junit:4.13.2'
+    implementation "androidx.appcompat:appcompat:1.8.0"
 }

app/src/main/AndroidManifest.xml

@@ -1,9 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    package="com.hyperling.apps.the45minuterule">
-
-    <uses-sdk tools:overrideLibrary="com.google.android.gms,com.google.android.gms.ads" />
+    xmlns:tools="http://schemas.android.com/tools">
 
     <!-- Include required permissions for Google Mobile Ads to run. -->
     <uses-permission android:name="android.permission.INTERNET" />
@@ -11,7 +8,7 @@
 
     <application
         android:allowBackup="true"
-        android:icon="@mipmap/t45mr_icon_003"
+        android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme"

app/src/main/java/com/hyperling/apps/the45minuterule/MainActivity.java

@@ -7,7 +7,7 @@ import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.os.Build;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
+//import android.support.v7.app.AppCompatActivity;
 import android.text.format.DateFormat;
 import android.util.Log;
 import android.view.Gravity;
@@ -24,6 +24,8 @@ import android.widget.TextView;
 import android.widget.TimePicker;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Timer;
@@ -254,18 +256,16 @@ public class MainActivity extends AppCompatActivity {
 
             ////////////////////////////////////////////////////////////////////////////////////////
             // Get sleepiness of the user
-            switch(radioGroup.getCheckedRadioButtonId()){
-                case R.id.rb1:
-                    sleepiness = Integer.parseInt(recs.getString(R.string.rb_opt1_value));
-                    break;
-                case R.id.rb2:
-                    sleepiness = Integer.parseInt(recs.getString(R.string.rb_opt2_value));
-                    break;
-                case R.id.rb3:
-                    sleepiness = Integer.parseInt(recs.getString(R.string.rb_opt3_value));
-                    break;
-                default:
-                    sleepiness = 0;
+            @SuppressWarnings("ConstantConditions")
+            int checkedRadioButtonId = radioGroup.getCheckedRadioButtonId();
+            if (checkedRadioButtonId == R.id.rb1) {
+                sleepiness = Integer.parseInt(recs.getString(R.string.rb_opt1_value));
+            } else if (checkedRadioButtonId == R.id.rb2) {
+                sleepiness = Integer.parseInt(recs.getString(R.string.rb_opt2_value));
+            } else if (checkedRadioButtonId == R.id.rb3) {
+                sleepiness = Integer.parseInt(recs.getString(R.string.rb_opt3_value));
+            } else {
+                sleepiness = 0;
             }
             if (debug) System.out.println("Sleepiness is " + sleepiness);
             ////////////////////////////////////////////////////////////////////////////////////////

app/src/main/java/com/hyperling/apps/the45minuterule/Tips.java

@@ -2,12 +2,14 @@ package com.hyperling.apps.the45minuterule;
 
 import android.content.res.Resources;
 import android.graphics.Color;
-import android.support.v7.app.AppCompatActivity;
+//import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.ViewGroup;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 public class Tips extends AppCompatActivity {
 
     @Override