Used Android Studio Refactor tool to convert to AppCompat (had to change some references back to just Activity to get it to compile

app/src/main/java/com/rohitss/uceh/UCEDefaultActivity.java

@@ -18,8 +18,6 @@
 package com.rohitss.uceh;
 
 import android.annotation.SuppressLint;
-import android.app.Activity;
-import android.app.AlertDialog;
 import android.content.ClipData;
 import android.content.ClipboardManager;
 import android.content.Context;
@@ -28,7 +26,6 @@ import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
-import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
@@ -39,6 +36,9 @@ import android.view.View;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -54,7 +54,7 @@ import uk.org.openseizuredetector.R;
  * <p>This class is used to </p>
  * Created by Rohit.
  */
-public final class UCEDefaultActivity extends Activity {
+public final class UCEDefaultActivity extends AppCompatActivity {
     private File txtFile;
     private String strCurrentErrorLog;
     private String TAG = "UCEDefaultActivity";

app/src/main/java/com/rohitss/uceh/UCEHandler.java

@@ -25,6 +25,8 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.lang.ref.WeakReference;
@@ -228,7 +230,7 @@ public final class UCEHandler {
         return context.getSharedPreferences(SHARED_PREFERENCES_FILE, Context.MODE_PRIVATE).getLong(SHARED_PREFERENCES_FIELD_TIMESTAMP, -1);
     }
 
-    static void closeApplication(Activity activity) {
+    static void closeApplication(AppCompatActivity activity) {
         activity.finish();
         killCurrentProcess();
     }

app/src/main/java/uk/org/openseizuredetector/BLEScanActivity.java

@@ -17,6 +17,8 @@ package uk.org.openseizuredetector;
  */
 
 
+import static androidx.core.content.PermissionChecker.PERMISSION_GRANTED;
+
 import android.Manifest;
 import android.app.Activity;
 import android.app.ListActivity;
@@ -33,8 +35,6 @@ import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.os.Handler;
 import android.preference.PreferenceManager;
-import androidx.core.app.ActivityCompat;
-import androidx.core.content.ContextCompat;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -47,9 +47,12 @@ import android.widget.ListView;
 import android.widget.TextView;
 import android.widget.Toast;
 
-import java.util.ArrayList;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import androidx.core.view.MenuItemCompat;
 
-import static androidx.core.content.PermissionChecker.PERMISSION_GRANTED;
+import java.util.ArrayList;
 
 /**
  * Activity for scanning and displaying available Bluetooth LE devices.
@@ -116,7 +119,7 @@ public class BLEScanActivity extends ListActivity {
         if (!mScanning) {
             menu.findItem(R.id.menu_stop).setVisible(false);
             menu.findItem(R.id.menu_scan).setVisible(true);
-            menu.findItem(R.id.menu_refresh).setActionView(null);
+            MenuItemCompat.setActionView(menu.findItem(R.id.menu_refresh), null);
         } else {
             menu.findItem(R.id.menu_stop).setVisible(true);
             menu.findItem(R.id.menu_scan).setVisible(false);

app/src/main/java/uk/org/openseizuredetector/MainActivity.java

@@ -25,7 +25,6 @@
 
 package uk.org.openseizuredetector;
 
-import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
@@ -37,25 +36,20 @@ import android.os.Handler;
 import android.os.Message;
 import android.os.Messenger;
 import android.preference.PreferenceManager;
-import androidx.core.view.MenuCompat;
-import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewConfiguration;
 import android.view.WindowManager;
+import android.widget.Button;
 import android.widget.ProgressBar;
 import android.widget.TextView;
-import android.widget.Button;
 
-import java.lang.reflect.Field;
+import androidx.appcompat.app.AlertDialog;
-import java.text.DecimalFormat;
+import androidx.appcompat.app.AppCompatActivity;
-import java.util.ArrayList;
+import androidx.core.view.MenuCompat;
-import java.util.Timer;
-import java.util.TimerTask;
 
-//MPAndroidChart
 import com.github.mikephil.charting.charts.BarChart;
 import com.github.mikephil.charting.components.XAxis;
 import com.github.mikephil.charting.components.YAxis;
@@ -65,6 +59,14 @@ import com.github.mikephil.charting.data.BarEntry;
 import com.github.mikephil.charting.utils.ValueFormatter;
 import com.rohitss.uceh.UCEHandler;
 
+import java.lang.reflect.Field;
+import java.text.DecimalFormat;
+import java.util.ArrayList;
+import java.util.Timer;
+import java.util.TimerTask;
+
+//MPAndroidChart
+
 public class MainActivity extends AppCompatActivity {
     static final String TAG = "MainActivity";
     private int okColour = Color.BLUE;

app/src/main/java/uk/org/openseizuredetector/OsdUncaughtExceptionHandler.java

@@ -1,6 +1,5 @@
 package uk.org.openseizuredetector;
 
-import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -11,7 +10,8 @@ import android.os.Environment;
 import android.os.Looper;
 import android.os.StatFs;
 import android.util.Log;
-import android.view.WindowManager;
+
+import androidx.appcompat.app.AlertDialog;
 
 import java.io.File;
 import java.io.PrintWriter;

app/src/main/java/uk/org/openseizuredetector/OsdUtil.java

@@ -45,12 +45,14 @@ import android.os.Build;
 import android.os.Environment;
 import android.os.Handler;
 import android.preference.PreferenceManager;
-import androidx.core.app.ActivityCompat;
-import androidx.core.content.ContextCompat;
 import android.text.format.Time;
 import android.util.Log;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+
 import org.apache.http.conn.util.InetAddressUtils;
 
 import java.io.File;
@@ -488,7 +490,7 @@ public class OsdUtil implements ActivityCompat.OnRequestPermissionsResultCallbac
     }
 
 
-    public void requestPermissions(Activity activity) {
+    public void requestPermissions(AppCompatActivity activity) {
         if (mPermissionsRequested) {
             Log.i(TAG, "requestPermissions() - request already sent - not doing anything");
         } else {

app/src/main/java/uk/org/openseizuredetector/SdServer.java

@@ -26,11 +26,7 @@
 
 package uk.org.openseizuredetector;
 
-import java.text.DecimalFormat;
-import java.text.NumberFormat;
-
 import android.app.ActivityManager;
-import android.app.AlertDialog;
 import android.app.Notification;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
@@ -49,24 +45,21 @@ import android.media.ToneGenerator;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
 import android.net.Uri;
+import android.os.Binder;
 import android.os.Build;
 import android.os.CountDownTimer;
 import android.os.Handler;
 import android.os.HandlerThread;
-import android.os.Binder;
 import android.os.IBinder;
 import android.os.PowerManager;
 import android.os.PowerManager.WakeLock;
 import android.preference.PreferenceManager;
-import androidx.core.app.NotificationCompat;
 import android.telephony.SmsManager;
+import android.text.format.Time;
 import android.util.Log;
 
-import java.util.Timer;
+import androidx.appcompat.app.AlertDialog;
-import java.io.*;
+import androidx.core.app.NotificationCompat;
-import java.util.*;
-
-import android.text.format.Time;
 
 import com.rohitss.uceh.UCEHandler;
 
@@ -74,6 +67,12 @@ import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.io.IOException;
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
+import java.util.List;
+import java.util.Timer;
+
 /**
  * Based on example at:
  * http://stackoverflow.com/questions/14309256/using-nanohttpd-in-android

app/src/main/java/uk/org/openseizuredetector/StartupActivity.java

@@ -24,8 +24,6 @@
 */
 package uk.org.openseizuredetector;
 
-import android.app.Activity;
-import android.app.AlertDialog;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -46,6 +44,9 @@ import android.widget.Button;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+
 import com.rohitss.uceh.UCEHandler;
 
 import java.util.Timer;
@@ -56,7 +57,7 @@ import java.util.TimerTask;
  * for it to start and to receive data and settings from the seizure detector before exiting and
  * starting the main activity.
  */
-public class StartupActivity extends Activity {
+public class StartupActivity extends AppCompatActivity {
     private static String TAG = "StartupActivity";
     private int okColour = Color.BLUE;
     private int warnColour = Color.MAGENTA;

app/src/main/res/layout/activity_authenticate.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical">
@@ -15,7 +16,7 @@
             android:background="#FFFFFF"
             android:contentDescription="@string/app_name"
             android:scaleType="center"
-            android:src="@drawable/star_of_life_24x24" />
+            app:srcCompat="@drawable/star_of_life_24x24" />
 
         <TextView
             android:layout_width="wrap_content"

app/src/main/res/layout/startup_activity.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
@@ -15,7 +16,7 @@
         android:layout_height="wrap_content"
         android:id="@+id/imageView"
         android:layout_gravity="center_horizontal"
-        android:src="@drawable/star_of_life_48x48" />
+        app:srcCompat="@drawable/star_of_life_48x48" />
 
     <TextView
         android:layout_width="wrap_content"

app/src/main/res/menu/log_manager_activity_menu.xml

@@ -1,8 +1,9 @@
-<menu xmlns:android="http://schemas.android.com/apk/res/android">
+<menu xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
     <group android:id="@+id/grp1">
         <item
             android:id="@+id/pruneDatabaseMenuItem"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/prune_database" />
     </group>
 
@@ -11,7 +12,7 @@
             android:id="@+id/action_report_seizure"
             android:enabled="true"
             android:icon="@drawable/ic_action_settings"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/report_seizure" />
 
 
@@ -19,7 +20,7 @@
             android:id="@+id/action_authenticate_api"
             android:enabled="true"
             android:icon="@drawable/ic_action_settings"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/data_sharing_log_in" />
 
     </group>

app/src/main/res/menu/main_activity_actions.xml

@@ -1,8 +1,9 @@
-<menu xmlns:android="http://schemas.android.com/apk/res/android">
+<menu xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
     <group android:id="@+id/grp1">
         <item
             android:id="@+id/action_accept_alarm"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/accept_alarm" />
     </group>
 
@@ -10,7 +11,7 @@
         <item
             android:id="@+id/action_start_stop"
             android:icon="@drawable/stop_server"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/start_stop_server" />
     </group>
     <group android:id="@+id/grp3">
@@ -18,53 +19,53 @@
             android:id="@+id/action_report_seizure"
             android:enabled="true"
             android:icon="@drawable/ic_action_settings"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/report_seizure" />
 
         <item
             android:id="@+id/action_logmanager"
             android:enabled="true"
             android:icon="@drawable/ic_action_settings"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/data_log_manager" />
 
         <item
             android:id="@+id/action_authenticate_api"
             android:enabled="true"
             android:icon="@drawable/ic_action_settings"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/data_sharing_log_in" />
 
         <item
             android:id="@+id/action_about_datasharing"
             android:enabled="true"
             android:icon="@drawable/ic_action_settings"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="About Data Sharing..." />
 
     </group>
     <group android:id="@+id/grp4">
         <item
             android:id="@+id/action_install_watch_app"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/install_watch_app" />
 
         <item
             android:id="@+id/action_test_alarm_beep"
             android:icon="@drawable/stop_server"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/test_alarm_beep" />
 
         <item
             android:id="@+id/action_test_warning_beep"
             android:icon="@drawable/stop_server"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/test_warning_beep" />
 
         <item
             android:id="@+id/action_test_sms_alarm"
             android:icon="@drawable/stop_server"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/test_sms_alarm_notification" />
     </group>
     <group android:id="@+id/grp5">
@@ -86,7 +87,7 @@
         <item
             android:id="@+id/action_settings"
             android:icon="@drawable/ic_action_settings"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/settings" />
 
     </group>
@@ -95,7 +96,7 @@
 
         <item
             android:id="@+id/action_about"
-            android:showAsAction="never|withText"
+            app:showAsAction="never|withText"
             android:title="@string/about" />
     </group>