Getting off shared preferencies

app/src/main/java/fr/romanet/vj/apps/myweather/AddCity.java

@@ -4,6 +4,7 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 
 import android.content.Context;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.view.View;
@@ -16,10 +17,6 @@ public class AddCity extends AppCompatActivity {
 
     private EditText cityName;
 
-    // - Define shared preferences var -
-    SharedPreferences sharedPreferences;
-
-
     @Override
     protected void onCreate(Bundle savedInstanceState)
     {
@@ -39,26 +36,15 @@ public class AddCity extends AppCompatActivity {
             {
                 cityName =  (EditText) findViewById(R.id.editTextNewCity);
                 final String newCityString = cityName.getEditableText().toString();
-                if(newCityString.length() == 0)
+                if(newCityString.isEmpty())
                 {
                     cityName.setError("Please, enter a city name");
                 }
-                else
+                else {
-
-                    // - Load Shared Preferences (named 'prefs') -
-                    sharedPreferences = getSharedPreferences("prefs", Context.MODE_PRIVATE);
-
-                    // - Now the ImageView has to be hidden, so write it into the shared preferences -
-                    // - Put value '0' into the preference 'umbrella_visible' of the shared preference book called 'prefs'
-                    SharedPreferences.Editor editor = sharedPreferences.edit();
-                    editor.putInt("umbrella_visible", 0);
-                    editor.apply();
-
                     saveCity(newCityString);
                     resetForm();
-
+                    openAddCityPage();
-
+                }
-
             }
         });
     }
@@ -73,4 +59,10 @@ public class AddCity extends AppCompatActivity {
         CityRepository.getInstance(this).addCity(new City(cityName));
     }
 
+    public void openAddCityPage()
+    {
+        Intent intent = new Intent(AddCity.this, MainActivity.class);
+        startActivity(intent);
+    }
+
 }

app/src/main/java/fr/romanet/vj/apps/myweather/MainActivity.java

@@ -2,31 +2,59 @@ package fr.romanet.vj.apps.myweather;
 
 import android.content.*;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.DividerItemDecoration;
+import androidx.recyclerview.widget.RecyclerView;
+
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.EditText;
 import android.widget.ImageView;
+import android.widget.ListView;
+import android.widget.TextView;
 
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 
+import org.w3c.dom.Text;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import fr.romanet.vj.apps.myweather.bo.City;
+import fr.romanet.vj.apps.myweather.repository.CityRepository;
+
 public class MainActivity extends AppCompatActivity {
 
-    // - Umbrella ImageView
+    private ListView listViewCityNames;
-    public static ImageView imgPara;
+    private FloatingActionButton buttonPlus;
-
+    private ImageView imgPara;
-    // - Is used to store the shared preference value of umbrella visibility
+    private TextView addCityText;
-    public int umbrella_visible;
-
-    // - Define shared preferences var -
-    SharedPreferences sharedPreferences;
-
 
     @Override
     protected void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        FloatingActionButton buttonPlus = (FloatingActionButton) findViewById(R.id.plusButton);
+
+        listViewCityNames = findViewById(R.id.listeCity);
+        buttonPlus = (FloatingActionButton) findViewById(R.id.plusButton);
+        imgPara = (ImageView) findViewById(R.id.imageView);
+        addCityText = (TextView) findViewById(R.id.textViewAddCity);
+
+        initialisingComponents();
+
+        listViewCityNames.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
+                String currentCityName = adapterView.getItemAtPosition(i).toString();
+                Intent intent = new Intent(MainActivity.this, ShowTemparature.class);
+                intent.putExtra( "cityName", currentCityName);
+                startActivity(intent);
+            }
+        });
+
         buttonPlus.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view)
@@ -34,46 +62,39 @@ public class MainActivity extends AppCompatActivity {
                 openAddCityPage();
             }
         });
-
-        // - Assign Activity ImageView to var -
-        imgPara = (ImageView) findViewById(R.id.imageView);
-
-        // - Load Shared Preferences (named 'prefs') -
-        sharedPreferences = getSharedPreferences("prefs", Context.MODE_PRIVATE);
-
-        // - Try to retrieve 'umbrella_visible', if not set return 3 -
-        umbrella_visible = sharedPreferences.getInt("umbrella_visible", 3);
-
-        // - If preference not yet defined, set value to 1 (visible) -
-        if (umbrella_visible == 3){
-
-            // - Put value '1' into the preference 'umbrella_visible' of the shared preference book called 'prefs'
-            SharedPreferences.Editor editor = sharedPreferences.edit();
-            editor.putInt("umbrella_visible", 1);
-            editor.apply();
-        }
-
-        Log.d("DEBUG1 -> create", Integer.toString(umbrella_visible));
-
     }
 
     @Override
-    protected void onResume() {
+    protected void onResume()
+    {
         super.onResume();
+        //initList();
+    }
 
-        // - Load Shared Preferences (named 'prefs') -
+    public void initialisingComponents()
-        sharedPreferences = getSharedPreferences("prefs", Context.MODE_PRIVATE);
+    {
-
+        final List<City> city = CityRepository.getInstance(this).getCity();
-        // - Try to retrieve 'umbrella_visible', if not set return 3 -
+        if(city.isEmpty())
-        umbrella_visible = sharedPreferences.getInt("umbrella_visible", 3);
+        {
-        Log.d("DEBUG1 -> resume", Integer.toString(umbrella_visible));
+            listViewCityNames.setVisibility(View.GONE);
-
-        // - If 'umbrella_visible' is equal to '0', we have to hide the ImageView -
-        if(umbrella_visible == 0){
-
-            // - Hide ImageView -
-            imgPara.setVisibility(View.GONE);
         }
+        else{
+            imgPara.setVisibility(View.GONE);
+            addCityText.setVisibility(View.GONE);
+        }
+        initList();
+    }
+
+    public void initList()
+    {
+        final List<City> city = CityRepository.getInstance(this).getCity();
+        ArrayList<String> listeExample = new ArrayList<String>();
+        for(int i = 0; i < city.size(); i++)
+        {
+            listeExample.add("" + city.get(i).nameCity);
+        }
+        ArrayAdapter<String> adapter = new ArrayAdapter<String>( this, android.R.layout.simple_list_item_1, listeExample);
+        listViewCityNames.setAdapter(adapter);
     }
 
     public void openAddCityPage()