initial area management

Code Android/meinWald/app/src/main/java/com/example/meinwald/ui/area/AreaAdapter.java

@@ -5,12 +5,14 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.graphics.Rect;
 import android.util.Log;
+import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import com.example.meinwald.BuildConfig;
 import com.example.meinwald.R;
@@ -50,15 +52,15 @@ public class AreaAdapter extends BaseAdapter
     public View getView(final int i, View view, final ViewGroup viewGroup) {
 
         view = inflater.inflate(R.layout.area_element, null);
-        final ConstraintLayout elementView = view.findViewById(R.id.areaInfoView);
+        final ConstraintLayout elementView = view.findViewById(R.id.areaElement);
         final ConstraintLayout infovView = view.findViewById(R.id.areaInfoView);
         final TextView title = (TextView) view.findViewById(R.id.areaInfoTitle);
         final TextView notice = (TextView) view.findViewById(R.id.areaInfoNotice);
         final ImageView icon = (ImageView) view.findViewById(R.id.areaIcon);
+        final ImageView manageArea = (ImageView) view.findViewById(R.id.areaManageArea);
+
         context = view.getContext();
 
-
-
         if (BuildConfig.DEBUG)
         {
             Log.d("AreaAdapter",areaList.get(i).toString());
@@ -70,21 +72,84 @@ public class AreaAdapter extends BaseAdapter
         notice.setText(areaList.get(i).getNotice());
         icon.setImageBitmap(areaList.get(i).getImage());
 
-        title.setOnClickListener(new View.OnClickListener() {
+        manageArea.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v)
             {
+                final AlertDialog.Builder builder = new AlertDialog.Builder(v.getRootView().getContext());
+                final View viewInflated = LayoutInflater.from(v.getRootView().getContext()).inflate(R.layout.area_management, viewGroup, false);
+
+                builder.setView(viewInflated);
+
+                //get elements
+                TextView title = viewInflated.findViewById(R.id.areaManageTitle);
+                final TextView notice = viewInflated.findViewById(R.id.areaManageNotice);
+                TextView gpscount = viewInflated.findViewById(R.id.areaManageGPSPoints);
+                ImageView image = (ImageView) viewInflated.findViewById(R.id.areaManageImage);
+
+                ImageView newNotice = (ImageView) viewInflated.findViewById(R.id.areaManageNewDescription);
+                ImageView newGPS = (ImageView) viewInflated.findViewById(R.id.areaManageNewGPS);
+                ImageView newImage = (ImageView) viewInflated.findViewById(R.id.areaManageNewImage);
+                ImageView deleteArea = (ImageView) viewInflated.findViewById(R.id.areaManageDeleteArea);
+
+                //set current vlues
+                title.setText(areaList.get(i).getTitle());
+                notice.setText(areaList.get(i).getNotice());
+                gpscount.setText(String.valueOf(areaList.get(i).getLocations().size()));
+
+                if (areaList.get(i).getImage() != null)
+                {
+                    image.setImageBitmap(areaList.get(i).getImage());
+                }
+
+                newNotice.setOnClickListener(new View.OnClickListener() {
+                    @Override
+                    public void onClick(View v)
+                    {
+                        final AlertDialog.Builder newbuilder = new AlertDialog.Builder(v.getRootView().getContext());
+                        final View viewInflated = LayoutInflater.from(v.getRootView().getContext()).inflate(R.layout.area_management_notice, viewGroup, false);
+
+                        newbuilder.setView(viewInflated);
+
+                        final TextView noticeView = viewInflated.findViewById(R.id.areaManagementNoticeUserInput);
+
+                        newbuilder.setPositiveButton("Bestätigen", new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+
+                                areaList.get(i).setNotice(noticeView.getText().toString());
+                                notice.setText(areaList.get(i).getNotice());
+                                dialog.dismiss();
+                            }
+                        });
+
+                        newbuilder.setNegativeButton("Abbrechen", new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                dialog.cancel();
+                            }
+                        });
+
+                        newbuilder.show();
+                    }});
 
 
-            }
+                builder.setPositiveButton("Bestätigen", new DialogInterface.OnClickListener() {
-        });
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
 
-        notice.setOnClickListener(new View.OnClickListener() {
+                        dialog.dismiss();
-            @Override
+                    }
-            public void onClick(View v)
+                });
-            {
 
+                builder.setNegativeButton("Abbrechen", new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        dialog.cancel();
+                    }
+                });
 
+                builder.show();
             }
         });
 
@@ -114,10 +179,17 @@ public class AreaAdapter extends BaseAdapter
             }
         });
 
-        view.setOnLongClickListener(new View.OnLongClickListener() {
+        elementView.setOnLongClickListener(new View.OnLongClickListener() {
             @Override
             public boolean onLongClick(View v) {
-                // TODO Auto-generated method stub
+
+                Toast toast = Toast.makeText(context, "on long click!", Toast.LENGTH_SHORT);
+                TextView tv = (TextView) toast.getView().findViewById(android.R.id.message);
+                if( v != null)
+                {
+                    //text align center
+                    tv.setGravity(Gravity.CENTER);
+                }
                 return true;
             }
         });

Code Android/meinWald/app/src/main/java/com/example/meinwald/ui/area/AreaFragment.java

@@ -3,13 +3,9 @@ package com.example.meinwald.ui.area;
 import android.Manifest;
 import android.annotation.SuppressLint;
 import android.app.AlertDialog;
-import android.content.ComponentName;
 import android.content.DialogInterface;
-import android.content.ServiceConnection;
 import android.content.pm.PackageManager;
-import android.location.Location;
 import android.os.Bundle;
-import android.os.IBinder;
 import android.os.PowerManager;
 import android.preference.PreferenceManager;
 import android.util.Log;
@@ -24,27 +20,20 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.Observer;
 
 import com.example.meinwald.BuildConfig;
 import com.example.meinwald.R;
-import com.example.meinwald.ui.task.TaskAdapter;
-import com.example.meinwald.ui.task.TasksFragment;
 import com.google.android.gms.location.FusedLocationProviderClient;
 import com.google.android.gms.location.LocationServices;
 import com.google.android.gms.maps.model.LatLng;
-import com.google.android.gms.tasks.OnCompleteListener;
-import com.google.android.gms.tasks.Task;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
-import org.json.JSONStringer;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -52,8 +41,6 @@ import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.FileReader;
 import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.List;
@@ -62,7 +49,7 @@ import static android.content.Context.POWER_SERVICE;
 
 public class AreaFragment extends Fragment {
 
-    private static final String TAG = TasksFragment.class.getSimpleName();
+    private static final String TAG = AreaFragment.class.getSimpleName();
 
     /**
      * ______________________________________________________________________________________________
@@ -109,6 +96,15 @@ public class AreaFragment extends Fragment {
     PowerManager.WakeLock wakeLock;
     LocationService gps;
 
+    @Override
+    public void onCreate (Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+
+        areaReferences = new ArrayList<>();
+        areaReferences = readAreaReferencesFromPreferences();
+    }
+
 
     @SuppressLint("InvalidWakeLockTag")
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
@@ -125,7 +121,10 @@ public class AreaFragment extends Fragment {
         //instantiate area lists
         areaList = (ListView) root.findViewById(R.id.areaListView);
         allAreas = new ArrayList<>();
-        areaReferences = new ArrayList<>();
+
+        //get saved areas
+        allAreas = loadAreasFromPreferences();
+        instantiateAreasList();
 
         PowerManager powerManager = (PowerManager) getContext().getSystemService(POWER_SERVICE);
         wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakelockTag");
@@ -142,11 +141,6 @@ public class AreaFragment extends Fragment {
                 getLocationPermission();
                 getWriteStoragePPermission();
 
-                //get saved areas
-                areaReferences = readAreaReferencesFromPreferences();
-                allAreas = loadAreasFromPreferences();
-                instantiateAreasList();
-
                 AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
 
                 newArea = new OwnArea();
@@ -195,7 +189,7 @@ public class AreaFragment extends Fragment {
                     public void onClick(DialogInterface dialog, int which) {
 
                         final TextView titleView = viewInflated.findViewById(R.id.areaTitleUserInput);
-                        final TextView noticeView = viewInflated.findViewById(R.id.areaNoticeUserInput);
+                        final TextView noticeView = viewInflated.findViewById(R.id.areaManagementNoticeUserInput);
 
                         if (BuildConfig.DEBUG) {
                             Log.d(TAG, "new title: " + titleView.getText());
@@ -215,12 +209,9 @@ public class AreaFragment extends Fragment {
                                 Log.d(TAG, "add new task result: " + result);
                             }
 
-                            //stop tracking
+                            emptyPreferencesAndSaveAreaReferencesToPreferences();
-                            //wakeLock.release();
 
-                            //save new area
+                            areaReferences.add(new AreaReference(newArea.getId(), writeAreaToExternalStorage(newArea)));
-                            allAreas.add(newArea);
-                            writeAreaToExternalStorage(newArea);
 
                             //actuate list
                             instantiateAreasList();
@@ -291,10 +282,10 @@ public class AreaFragment extends Fragment {
     @Override
     public void onPause() {
 
-        //save area references to shared preferences
-        emptyPreferencesAndSaveEpiColorsToPreferences();
-
         super.onPause();
+
+        //save area references to shared preferences
+        emptyPreferencesAndSaveAreaReferencesToPreferences();
     }
 
     /**
@@ -303,13 +294,26 @@ public class AreaFragment extends Fragment {
      */
     private List<OwnArea> loadAreasFromPreferences()
     {
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "loadAreasFromPreferences() reference size: " + areaReferences.size());
+        }
+
         List<OwnArea> areas = new ArrayList<>();
+        Integer i = 0;
 
         for (AreaReference reference: areaReferences)
         {
             String jsonString = readAreaFromExternalStorage(reference.getPath());
 
             areas.add(new OwnArea(jsonString));
+
+            if (BuildConfig.DEBUG)
+            {
+                Log.d(TAG, "load area from preferences: " + areas.get(i).toString());
+            }
+
+            i++;
         }
 
         return areas;
@@ -323,13 +327,22 @@ public class AreaFragment extends Fragment {
      */
     private String writeAreaToExternalStorage(OwnArea newArea){
 
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "writeAreaToExternalStorage()");
+        }
+
         // Find the root of the external storage.
         File root = android.os.Environment.getExternalStorageDirectory();
 
         //create file if it does not exist
-        File path = new File (root.getAbsolutePath() + "meinWald" + File.pathSeparator + "areas");
+        File path = new File (getContext().getFilesDir(),  "meinWald" + File.pathSeparator + "areas");
         if(!path.exists()){
             path.mkdirs();
+            if (BuildConfig.DEBUG)
+            {
+                Log.d(TAG, "Create new text file: " + path);
+            }
         }
         File file = new File(path, newArea.getId() + ".txt");
 
@@ -341,9 +354,15 @@ public class AreaFragment extends Fragment {
             pw.close();
             f.close();
         } catch (FileNotFoundException e) {
-            e.printStackTrace();
+            if (BuildConfig.DEBUG)
+            {
+                Log.e(TAG, "Failed write to external storage: " + e.toString());
+            }
         } catch (IOException e) {
-            e.printStackTrace();
+            if (BuildConfig.DEBUG)
+            {
+                Log.e(TAG, "Failed write to external storage: " + e.toString());
+            }
         }
 
         return file.getPath();
@@ -357,6 +376,11 @@ public class AreaFragment extends Fragment {
      */
     private String readAreaFromExternalStorage(String path)
     {
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "readAreaFromExternalStorage()");
+        }
+
         //Get the text file
         File file = new File(path);
 
@@ -373,7 +397,10 @@ public class AreaFragment extends Fragment {
             br.close();
         }
         catch (IOException e) {
-            e.printStackTrace();
+            if (BuildConfig.DEBUG)
+            {
+                Log.e(TAG, "Failed read from external storage: " + e.toString());
+            }
         }
 
         return text.toString();
@@ -396,9 +423,15 @@ public class AreaFragment extends Fragment {
     /**
      * Reads areaReferences saved in preferences as jsonStrings
      *
-     * @return list of epiColorDtos
+     * @return list of AreaReferences
      */
     private List<AreaReference> readAreaReferencesFromPreferences() {
+
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "readAreaReferencesFromPreferences()");
+        }
+
         List<AreaReference> areas = new ArrayList<>();
 
         try {
@@ -406,24 +439,44 @@ public class AreaFragment extends Fragment {
             if(!"error".equalsIgnoreCase(jsonString)) {
                 JSONArray jsonObjects = new JSONArray(jsonString);
                 for (int i = 0; i<jsonObjects.length();i++) {
-                    areaReferences.add(new AreaReference(jsonObjects.getJSONObject(i)));
+                    areas.add(new AreaReference(jsonObjects.getJSONObject(i)));
+                }
+            }
+            else
+            {
+                if (BuildConfig.DEBUG)
+                {
+                    Log.e(TAG, "read area reference error");
                 }
             }
         }  catch (JSONException e) {
             if (BuildConfig.DEBUG) {
-                Log.e(TAG, "Error while parsing epicolors as jsonObjects from preferences");
+                Log.e(TAG, "Error while parsing area references as jsonObjects from preferences");
                 e.printStackTrace();
             }
         }
 
+        for (AreaReference reference: areas)
+        {
+            if (BuildConfig.DEBUG)
+            {
+                Log.d(TAG, "read reference: " + reference.toString());
+            }
+        }
+
         return areas;
     }
 
     /**
      * Saves epicolors to preferences
      */
-    private void emptyPreferencesAndSaveEpiColorsToPreferences()
+    private void emptyPreferencesAndSaveAreaReferencesToPreferences()
     {
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "emptyPreferencesAndSaveAreaReferencesToPreferences()");
+        }
+
         if (!areaReferences.isEmpty()) {
             if (BuildConfig.DEBUG) {
                 Log.d(TAG, "areaReferences not empty");
@@ -440,12 +493,18 @@ public class AreaFragment extends Fragment {
                 writeObjects.put(object);
 
                 if (BuildConfig.DEBUG) {
-                    Log.d("Color is ", object.toString());
+                    Log.d(TAG, "area reference is " + object.toString());
                 }
             }
 
             PreferenceManager.getDefaultSharedPreferences(getContext()).edit().putString(KEY_AREA_REFERENCES,  writeObjects.toString()).commit();
         }
+        else
+        {
+            if (BuildConfig.DEBUG) {
+                Log.e(TAG, "area references are empty!");
+            }
+        }
     }
 
     /**

Code Android/meinWald/app/src/main/java/com/example/meinwald/ui/area/OwnArea.java

@@ -7,10 +7,12 @@ import android.util.Log;
 import com.example.meinwald.BuildConfig;
 import com.google.android.gms.maps.model.LatLng;
 
+import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.sql.Time;
+import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 
@@ -23,7 +25,6 @@ public class OwnArea {
     private String pathImage;
     private String pathLocations;
     private String id;
-    private Date time;
 
     public void setImage(Bitmap image) {
         this.image = image;
@@ -89,11 +90,24 @@ public class OwnArea {
             this.title = areaObject.getString("title");
             this.notice = areaObject.getString("description");
             this.id = areaObject.getString("id");
-            this.time = new Date(areaObject.getString("time"));
+
+            String locationsString = areaObject.getString("locations");
+            JSONArray locations = new JSONArray(locationsString);
+            this.locations = new ArrayList<>();
+
+            for (int i = 0; i<locations.length();i++) {
+                this.locations.add(new LatLng((float) (locations.getJSONObject(i).getDouble("Lat")), (float) (locations.getJSONObject(i).getDouble("Lng"))));
+
+                if (BuildConfig.DEBUG)
+                {
+                    Log.d(getClass().getSimpleName(), "read location: " + this.locations.get(i).toString());
+                }
+            }
 
         } catch (JSONException e) {
             if (BuildConfig.DEBUG) {
-                Log.e(this.getClass().getSimpleName(),  "earthquakeJSON " + jsonString);
+                Log.e(this.getClass().getSimpleName(),  "area json: " + jsonString);
+                Log.e(this.getClass().getSimpleName(), e.toString());
                 e.printStackTrace();
             }
         }
@@ -123,28 +137,23 @@ public class OwnArea {
             object.put("description",this.notice);
             object.put("id",this.id);
 
-            if (this.time != null)
-            {
-                object.put("time", this.time);
-            }
-            else
-            {
-                object.put("time", new Date().getTime());
-            }
-
-
-            JSONObject locations = new JSONObject();
-            Long count = Long.valueOf(0);
-
             //convert all locations
-            for (LatLng location: this.locations)
+            JSONArray writeObjects = new JSONArray();
-            {
+
-                JSONObject locationObject = new JSONObject();
+            for (LatLng location: this.locations) {
-                locationObject.put("Lat", location.latitude);
+
-                locationObject.put("Lng", location.longitude);
+                JSONObject singleLocationObject = new JSONObject();
-                locations.put("location"+count, locationObject.toString());
+                singleLocationObject.put("Lat", location.latitude);
+                singleLocationObject.put("Lng", location.longitude);
+
+                writeObjects.put(singleLocationObject);
+
+                if (BuildConfig.DEBUG) {
+                    Log.d("OwnArea", "added location object: " + singleLocationObject.toString());
+                }
             }
-            object.put("locations", locations.toString());
+
+            object.put("locations", writeObjects.toString());
 
             return object;
 

Code Android/meinWald/app/src/main/java/com/example/meinwald/ui/map/MapsFragment.java

@@ -1,4 +1,4 @@
-package com.example.meinwald.ui.main.map;
+package com.example.meinwald.ui.map;
 
 import android.Manifest;
 import android.content.pm.PackageManager;
@@ -16,6 +16,8 @@ import android.widget.ListView;
 
 import com.example.meinwald.BuildConfig;
 import com.example.meinwald.R;
+import com.example.meinwald.ui.area.AreaReference;
+import com.example.meinwald.ui.area.OwnArea;
 import com.example.meinwald.ui.task.OwnTask;
 import com.google.android.gms.dynamic.IObjectWrapper;
 import com.google.android.gms.location.FusedLocationProviderClient;
@@ -28,13 +30,18 @@ import com.google.android.gms.maps.model.BitmapDescriptor;
 import com.google.android.gms.maps.model.CameraPosition;
 import com.google.android.gms.maps.model.LatLng;
 import com.google.android.gms.maps.model.MarkerOptions;
+import com.google.android.gms.maps.model.Polyline;
+import com.google.android.gms.maps.model.PolylineOptions;
 import com.google.android.gms.tasks.OnCompleteListener;
 import com.google.android.gms.tasks.Task;
 
 import org.json.JSONArray;
 import org.json.JSONException;
 
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -94,6 +101,23 @@ public class MapsFragment extends Fragment implements OnMapReadyCallback {
     private boolean mReadStorageGranted;
     private boolean mWriteStorageGranted;
 
+    /**
+     * ______________________________________________________________________________________________
+     * AREA
+     */
+    private List<OwnArea> allAreas;
+    private static final String KEY_AREA_REFERENCES = "areaReferences";
+    private List<AreaReference> areaReferences;
+
+    @Override
+    public void onCreate (Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+
+        areaReferences = new ArrayList<>();
+        areaReferences = readAreaReferencesFromPreferences();
+    }
+
     /**
      * Is called when the MapsFragment view is created. Initializes all service connections, the location client and map itself.
      * @param inflater Calling LayoutInflater
@@ -112,6 +136,13 @@ public class MapsFragment extends Fragment implements OnMapReadyCallback {
         //get tasks
         allTasks = readTasksFromPreferences();
 
+        //get areas
+        //instantiate area lists
+        allAreas = new ArrayList<>();
+
+        //get saved areas
+        allAreas = loadAreasFromPreferences();
+
         //display map fragment
         SupportMapFragment mapFragment = new SupportMapFragment();
         FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
@@ -163,6 +194,144 @@ public class MapsFragment extends Fragment implements OnMapReadyCallback {
         super.onPause();
     }
 
+    private void drawAreas()
+    {
+        for (OwnArea area: allAreas)
+        {
+
+            PolylineOptions options = new PolylineOptions().clickable(true);
+
+            for (LatLng location: area.getLocations())
+            {
+                options.add(location);
+
+                if (BuildConfig.DEBUG)
+                {
+                    Log.d(TAG, "Position: " + location.toString());
+                }
+            }
+
+            Polyline polyline1 = mMap.addPolyline(options);
+
+        }
+    }
+
+    /**
+     * Reads areaReferences saved in preferences as jsonStrings
+     *
+     * @return list of AreaReferences
+     */
+    private List<AreaReference> readAreaReferencesFromPreferences() {
+
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "readAreaReferencesFromPreferences()");
+        }
+
+        List<AreaReference> areas = new ArrayList<>();
+
+        try {
+            String jsonString = PreferenceManager.getDefaultSharedPreferences(getContext()).getString(KEY_AREA_REFERENCES, "error");
+            if(!"error".equalsIgnoreCase(jsonString)) {
+                JSONArray jsonObjects = new JSONArray(jsonString);
+                for (int i = 0; i<jsonObjects.length();i++) {
+                    areas.add(new AreaReference(jsonObjects.getJSONObject(i)));
+                }
+            }
+            else
+            {
+                if (BuildConfig.DEBUG)
+                {
+                    Log.e(TAG, "read area reference error");
+                }
+            }
+        }  catch (JSONException e) {
+            if (BuildConfig.DEBUG) {
+                Log.e(TAG, "Error while parsing area references as jsonObjects from preferences");
+                e.printStackTrace();
+            }
+        }
+
+        for (AreaReference reference: areas)
+        {
+            if (BuildConfig.DEBUG)
+            {
+                Log.d(TAG, "read reference: " + reference.toString());
+            }
+        }
+
+        return areas;
+    }
+
+    /**
+     * Get OwnAreas from a JSONString.
+     * @return
+     */
+    private List<OwnArea> loadAreasFromPreferences()
+    {
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "loadAreasFromPreferences() reference size: " + areaReferences.size());
+        }
+
+        List<OwnArea> areas = new ArrayList<>();
+        Integer i = 0;
+
+        for (AreaReference reference: areaReferences)
+        {
+            String jsonString = readAreaFromExternalStorage(reference.getPath());
+
+            areas.add(new OwnArea(jsonString));
+
+            if (BuildConfig.DEBUG)
+            {
+                Log.d(TAG, "load area from preferences: " + areas.get(i).toString());
+            }
+
+            i++;
+        }
+
+        return areas;
+    }
+
+    /**
+     * Read OwnArea from file in external storage and return as a string.
+     *
+     * @param path File path where the OwnArea is saved.
+     * @return
+     */
+    private String readAreaFromExternalStorage(String path)
+    {
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "readAreaFromExternalStorage()");
+        }
+
+        //Get the text file
+        File file = new File(path);
+
+        //Read text from file
+        StringBuilder text = new StringBuilder();
+
+        try {
+            BufferedReader br = new BufferedReader(new FileReader(file));
+            String line;
+
+            while ((line = br.readLine()) != null) {
+                text.append(line);
+            }
+            br.close();
+        }
+        catch (IOException e) {
+            if (BuildConfig.DEBUG)
+            {
+                Log.e(TAG, "Failed read from external storage: " + e.toString());
+            }
+        }
+
+        return text.toString();
+    }
+
     @Override
     public void onResume() {
         super.onResume();
@@ -330,6 +499,8 @@ public class MapsFragment extends Fragment implements OnMapReadyCallback {
 
             mMap.addMarker(marker);
         }
+
+        drawAreas();
     }
 
     /**

Code Android/meinWald/app/src/main/java/com/example/meinwald/ui/task/TasksFragment.java

@@ -299,6 +299,12 @@ public class TasksFragment extends Fragment {
      * Saves tasks to preferences
      */
     private void emptyPreferencesAndSaveTasksToPreferences() {
+
+        if (BuildConfig.DEBUG)
+        {
+            Log.d(TAG, "emptyPreferencesAndSaveTasksToPreferences()");
+        }
+
         if (!allTasks.isEmpty()) {
             if (BuildConfig.DEBUG) {
                 Log.d(TAG, "allTasks not empty!");

Code Android/meinWald/app/src/main/res/layout/area_element.xml

@@ -13,23 +13,40 @@
 
     <TextView
         android:id="@+id/areaInfoTitle"
-        android:layout_width="match_parent"
+        android:layout_width="375dp"
-        android:layout_height="30dp"
+        android:layout_height="32dp"
         android:layout_gravity="left"
         android:layout_marginStart="5dp"
         android:layout_marginLeft="5dp"
         android:layout_marginTop="5dp"
-        android:layout_marginEnd="5dp"
-        android:layout_marginRight="5dp"
         android:clickable="false"
-        android:focusable="false"
+        android:duplicateParentState="true"
 
+        android:focusable="false"
         android:textColor="@android:color/primary_text_light"
         android:textSize="22sp"
-        app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <ImageView
+        android:id="@+id/areaManageArea"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="5dp"
+        android:layout_marginEnd="5dp"
+        android:layout_marginRight="5dp"
+        android:clickable="true"
+        android:duplicateParentState="true"
+        android:focusable="false"
+        android:focusableInTouchMode="false"
+        android:src="@android:drawable/ic_menu_manage"
+        android:visibility="visible"
+        app:layout_constraintBottom_toTopOf="@+id/areaInfoView"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.0"
+        app:layout_constraintStart_toEndOf="@+id/areaInfoTitle"
+        app:layout_constraintTop_toTopOf="parent" />
+
     <androidx.constraintlayout.widget.ConstraintLayout
         android:id="@+id/areaInfoView"
         android:layout_width="0dp"
@@ -47,7 +64,8 @@
         app:layout_constraintHorizontal_bias="1.0"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/areaInfoTitle"
-        tools:visibility="visible">
+        tools:visibility="visible"
+        android:duplicateParentState="true">
 
 
         <ImageView
@@ -63,7 +81,8 @@
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            app:srcCompat="@android:drawable/ic_menu_camera" />
+            app:srcCompat="@android:drawable/ic_menu_camera"
+            android:duplicateParentState="true"/>
 
         <TextView
             android:id="@+id/areaInfoNotice"
@@ -78,7 +97,8 @@
             android:visibility="visible"
             app:layout_constraintEnd_toStartOf="@+id/taskIcon"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toTopOf="parent" />
+            app:layout_constraintTop_toTopOf="parent"
+            android:duplicateParentState="true"/>
 
     </androidx.constraintlayout.widget.ConstraintLayout>
 

Code Android/meinWald/app/src/main/res/layout/area_input.xml

@@ -25,16 +25,16 @@
     </EditText>
 
     <TextView
-        android:id="@+id/areaNotice"
+        android:id="@+id/areaManagementNotice"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Beschreibung"
         android:textAppearance="?android:attr/textAppearanceLarge" />
 
     <EditText
-        android:id="@+id/areaNoticeUserInput"
+        android:id="@+id/areaManagementNoticeUserInput"
         android:layout_width="match_parent"
-        android:layout_height="149dp"
+        android:layout_height="150dp"
         android:hint="Beschreibung eingeben!"
         android:isScrollContainer="true">
         <requestFocus />

Code Android/meinWald/app/src/main/res/layout/area_management.xml

@@ -0,0 +1,145 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/areaManageTitle"
+        android:layout_width="wrap_content"
+        android:layout_height="50dp"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginTop="5dp"
+        android:text="TextView"
+        android:textSize="36sp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/textView2"
+        android:layout_width="250dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginTop="5dp"
+        android:text="Beschreibung"
+        android:textSize="18sp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/areaManageTitle" />
+
+    <TextView
+        android:id="@+id/areaManageNotice"
+        android:layout_width="0dp"
+        android:layout_height="75dp"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginEnd="5dp"
+        android:layout_marginRight="5dp"
+        android:isScrollContainer="true"
+        android:textSize="12sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView2" />
+
+    <TextView
+        android:id="@+id/textView4"
+        android:layout_width="250dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginTop="15dp"
+        android:text="Anzahl GPS-Punkte"
+        android:textSize="18sp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/areaManageNotice" />
+
+    <TextView
+        android:id="@+id/textView6"
+        android:layout_width="250dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginTop="15dp"
+        android:text="Bild"
+        android:textSize="18sp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/areaManageGPSPoints" />
+
+    <TextView
+        android:id="@+id/areaManageGPSPoints"
+        android:layout_width="match_parent"
+        android:layout_height="30dp"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginEnd="5dp"
+        android:layout_marginRight="5dp"
+        android:textSize="12sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView4" />
+
+    <ImageView
+        android:id="@+id/areaManageImage"
+        android:layout_width="match_parent"
+        android:layout_height="200dp"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginEnd="5dp"
+        android:layout_marginRight="5dp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView6"
+        android:src="@android:drawable/ic_menu_gallery"
+        android:visibility="visible"/>
+
+    <ImageView
+        android:id="@+id/areaManageNewDescription"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        app:tint="#1B5E20"
+        android:visibility="visible"
+        app:layout_constraintBottom_toBottomOf="@+id/areaManageNotice"
+        app:layout_constraintEnd_toEndOf="@+id/areaManageNotice"
+        android:src="@android:drawable/ic_popup_sync" />
+
+    <ImageView
+        android:id="@+id/areaManageNewGPS"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        app:tint="#1B5E20"
+        android:visibility="visible"
+        app:layout_constraintBottom_toBottomOf="@+id/areaManageGPSPoints"
+        app:layout_constraintEnd_toEndOf="@+id/areaManageGPSPoints"
+        android:src="@android:drawable/ic_popup_sync" />
+
+    <ImageView
+        android:id="@+id/areaManageNewImage"
+        android:layout_width="30dp"
+        android:layout_height="30dp"
+        app:tint="#1B5E20"
+        android:visibility="visible"
+        app:layout_constraintBottom_toBottomOf="@+id/areaManageImage"
+        app:layout_constraintEnd_toEndOf="@+id/areaManageImage"
+        android:src="@android:drawable/ic_menu_camera" />
+
+    <ImageView
+        android:id="@+id/areaManageDeleteArea"
+        android:layout_width="50dp"
+        android:layout_height="50dp"
+        android:layout_marginTop="5dp"
+        android:layout_marginEnd="5dp"
+        android:layout_marginRight="5dp"
+        android:src="@android:drawable/ic_menu_delete"
+        app:tint="#B71C1C"
+        android:visibility="visible"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+         />
+</androidx.constraintlayout.widget.ConstraintLayout>

Code Android/meinWald/app/src/main/res/layout/area_management_notice.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    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">
+
+    <TextView
+        android:id="@+id/areaManagementNotice"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:layout_marginTop="5dp"
+        android:text="Neue Beschreibung"
+        android:textAppearance="?android:attr/textAppearanceLarge"
+        android:textStyle="bold"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <EditText
+        android:id="@+id/areaManagementNoticeUserInput"
+        android:layout_width="match_parent"
+        android:layout_height="149dp"
+        android:layout_marginStart="5dp"
+        android:layout_marginLeft="5dp"
+        android:hint="Neue Beschreibung eingeben!"
+        android:isScrollContainer="true"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/areaManagementNotice">
+
+        <requestFocus />
+    </EditText>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

Code Android/meinWald/app/src/main/res/layout/fragment_map.xml

@@ -8,7 +8,7 @@
     app:layout_constraintLeft_toLeftOf="parent"
     app:layout_constraintRight_toRightOf="parent"
     app:layout_constraintTop_toTopOf="parent"
-    tools:context=".ui.home.MapsFragment">
+    tools:context=".ui.map.MapsFragment">
 
     <fragment xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:map="http://schemas.android.com/apk/res-auto"

Code Android/meinWald/app/src/main/res/layout/image_large.xml

@@ -13,7 +13,7 @@
     <ImageView
         android:id="@+id/taskLargeImage"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="575dp"
         android:scaleType="fitXY"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"

Code Android/meinWald/app/src/main/res/layout/task_input.xml

@@ -83,8 +83,8 @@
 
         <ImageView
             android:id="@+id/taskImage"
-            android:layout_width="wrap_content"
+            android:layout_width="100dp"
-            android:layout_height="wrap_content"
+            android:layout_height="200dp"
             android:layout_gravity="center"
             android:baselineAlignBottom="true"
             android:foregroundGravity="center_vertical|center_horizontal"

Code Android/meinWald/app/src/main/res/navigation/mobile_navigation.xml

@@ -7,7 +7,7 @@
 
     <fragment
         android:id="@+id/navigation_map"
-        android:name="com.example.meinwald.ui.main.map.MapsFragment"
+        android:name="com.example.meinwald.ui.map.MapsFragment"
         android:label="@string/title_map"
         tools:layout="@layout/fragment_map" />