Issue #2 points 1 and 3 resolved

.gitignore

@@ -0,0 +1,2 @@
+
+androidkey.jks

src/app/src/main/AndroidManifest.xml

@@ -12,7 +12,6 @@
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
-
     <uses-permission android:name="android.permission.VIBRATE" />
 
     <application

src/app/src/main/java/com/xfarrow/locatemydevice/RingerActivity.java

@@ -18,7 +18,7 @@ import android.widget.Button;
 public class RingerActivity extends AppCompatActivity {
 
     private Ringtone ringtoneManager;
-    private Vibrator v;
+    private Vibrator vibrator;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -60,7 +60,7 @@ public class RingerActivity extends AppCompatActivity {
         ringtoneManager.setVolume(1f);
         ringtoneManager.play();
 
-        v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
+        vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
 
         // Start without a delay
         // Vibrate for 500 milliseconds
@@ -70,17 +70,17 @@ public class RingerActivity extends AppCompatActivity {
         // '0' is actually the index at which the pattern keeps repeating from (the start)
         // To repeat the pattern from any other point, you could increase the index, e.g. '1'
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            v.vibrate(VibrationEffect.createWaveform(pattern, 0));
+            vibrator.vibrate(VibrationEffect.createWaveform(pattern, 0));
         }
         else{
-            v.vibrate(pattern,0);
+            vibrator.vibrate(pattern,0);
         }
     }
 
     private void stopRinging(){
         ringtoneManager.stop();
-        v.cancel();
+        vibrator.cancel();
-        finishAffinity();
+        finishAndRemoveTask();
     }
 
     @Override

src/app/src/main/java/com/xfarrow/locatemydevice/Utils.java

@@ -59,4 +59,9 @@ public class Utils {
         return String.valueOf(numberProto.getCountryCode());
     }
 
+    // We'll remove parenthesis, dashes and whitespaces
+    public static String normalizePhoneNumber(String phoneNo){
+        return phoneNo.replaceAll("[-()\\s]", "");
+    }
+
 }

src/app/src/main/java/com/xfarrow/locatemydevice/WhitelistContactsActivity.java

@@ -21,7 +21,7 @@ import java.util.ArrayList;
 public class WhitelistContactsActivity extends AppCompatActivity {
 
     private ListView contactsListView;
-    private ArrayList<String> contacts;
+    private ArrayList<String> contactsListView_datasource;
     private ArrayAdapter<String> listviewAdapter;
     private final WhitelistDbHandler whitelistDbHandler = new WhitelistDbHandler(this);
 
@@ -35,10 +35,10 @@ public class WhitelistContactsActivity extends AppCompatActivity {
         setViews();
         setListeners();
 
-        contacts = whitelistDbHandler.getAllContacts();
+        contactsListView_datasource = whitelistDbHandler.getAllContacts();
         listviewAdapter = new ArrayAdapter<String>(this,
                 android.R.layout.simple_list_item_1,
-                contacts);
+                contactsListView_datasource);
         contactsListView.setAdapter(listviewAdapter);
     }
 
@@ -58,9 +58,7 @@ public class WhitelistContactsActivity extends AppCompatActivity {
             @Override
             public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
                 String number = (String)adapterView.getItemAtPosition(i);
-                contacts.remove(number);
+                removeNumberFromWhiteList(number);
-                listviewAdapter.notifyDataSetChanged();
-                whitelistDbHandler.deleteContact(number);
                 return true;
             }
         });
@@ -98,23 +96,27 @@ public class WhitelistContactsActivity extends AppCompatActivity {
                 int phoneIndex = c.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
                 int contactNameIndex = c.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
                 String number = c.getString(phoneIndex);
-                String contactName = c.getString(contactNameIndex);
+                String contactName = c.getString(contactNameIndex); // planned to show contact's name as well
-                contactSelected(number);
+                addNumberToWhiteList(number);
             }
             c.close();
         }
     }
 
-    private void contactSelected(String phoneNo){
+    private void addNumberToWhiteList(String phoneNo){
-        // We'll replace parenthesis, dashes and whitespaces to obtain a valid phone number
+        phoneNo = Utils.normalizePhoneNumber(phoneNo);
-        phoneNo = phoneNo.replaceAll("[-()\\s]", "");
+        if(contactsListView_datasource.contains(phoneNo)){
-
-        if(contacts.contains(phoneNo)){
             Toast.makeText(this, "Contact already in the list", Toast.LENGTH_SHORT).show();
             return;
         }
         whitelistDbHandler.addContact(phoneNo);
-        contacts.add(phoneNo);
+        contactsListView_datasource.add(phoneNo);
+        listviewAdapter.notifyDataSetChanged();
+    }
+
+    private void removeNumberFromWhiteList(String phoneNo){
+        whitelistDbHandler.deleteContact(phoneNo);
+        contactsListView_datasource.remove(phoneNo);
         listviewAdapter.notifyDataSetChanged();
     }
 }