Implemented file writing, implemented write permission request, refactored Dialog to use DialogFragment, implemented json de/serializer for Settings

.idea/misc.xml

@@ -1,5 +1,44 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="org.jetbrains.annotations.Nullable" />
+    <option name="myDefaultNotNull" value="androidx.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="12">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="javax.annotation.CheckForNull" />
+          <item index="3" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="4" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.Nullable" />
+          <item index="6" class="java.lang.String" itemvalue="android.annotation.Nullable" />
+          <item index="7" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNullable" />
+          <item index="8" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.Nullable" />
+          <item index="9" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableDecl" />
+          <item index="10" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableType" />
+          <item index="11" class="java.lang.String" itemvalue="com.android.annotations.Nullable" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="11">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+          <item index="4" class="java.lang.String" itemvalue="androidx.annotation.NonNull" />
+          <item index="5" class="java.lang.String" itemvalue="android.annotation.NonNull" />
+          <item index="6" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNonNull" />
+          <item index="7" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.NonNull" />
+          <item index="8" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullDecl" />
+          <item index="9" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullType" />
+          <item index="10" class="java.lang.String" itemvalue="com.android.annotations.NonNull" />
+        </list>
+      </value>
+    </option>
+  </component>
   <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/MainActivity.java

@@ -1,20 +1,34 @@
 package org.timecrafters.TimeCraftersConfigurationTool;
 
+import android.Manifest;
 import android.os.Bundle;
+import android.util.Log;
+import android.widget.Toast;
 
 import com.google.android.material.bottomnavigation.BottomNavigationView;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 import androidx.navigation.NavController;
 import androidx.navigation.Navigation;
 import androidx.navigation.ui.AppBarConfiguration;
 import androidx.navigation.ui.NavigationUI;
 
+import org.timecrafters.TimeCraftersConfigurationTool.backend.Backend;
+import org.timecrafters.TimeCraftersConfigurationTool.dialogs.Dialog;
+import org.timecrafters.TimeCraftersConfigurationTool.dialogs.PermissionsRequestDialog;
+
+import static android.content.pm.PackageManager.PERMISSION_GRANTED;
+
 public class MainActivity extends AppCompatActivity {
+    private static final int REQUEST_WRITE_PERMISSION = 70;
+    private static final String TAG = "MainActivity";
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+
         setContentView(R.layout.activity_main);
         BottomNavigationView navView = findViewById(R.id.nav_view);
         // Passing each menu ID as a set of Ids because each
@@ -26,6 +40,40 @@ public class MainActivity extends AppCompatActivity {
         NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
         NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
         NavigationUI.setupWithNavController(navView, navController);
+
+        if (!havePermissions()) {
+            new PermissionsRequestDialog().show(getSupportFragmentManager(), null);
+        } else {
+            new Backend();
+        }
     }
 
+    @Override
+    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
+        switch (requestCode) {
+            case REQUEST_WRITE_PERMISSION: {
+                if (grantResults.length > 0 && grantResults[0] == PERMISSION_GRANTED) {
+                    // Permission granted
+                    new Backend();
+                } else {
+                    // Permission not given
+                    new PermissionsRequestDialog().show(getSupportFragmentManager(), null);
+                }
+            }
+        }
+    }
+
+    private boolean havePermissions() {
+        return ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PERMISSION_GRANTED;
+    }
+
+    public void requestStoragePermissions() {
+        ActivityCompat.requestPermissions(MainActivity.this,
+                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
+                REQUEST_WRITE_PERMISSION);
+    }
+
+    public void close() {
+        finish();
+    }
 }

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/backend/Backend.java

@@ -1,11 +1,30 @@
 package org.timecrafters.TimeCraftersConfigurationTool.backend;
 
-import org.timecrafters.TimeCraftersConfigurationTool.tacnet.PacketHandler;
+import android.util.Log;
 
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.internal.LinkedTreeMap;
+
+import org.timecrafters.TimeCraftersConfigurationTool.serializers.SettingsDeserializer;
+import org.timecrafters.TimeCraftersConfigurationTool.serializers.SettingsSerializer;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Date;
+import java.util.LinkedHashMap;
+import java.util.Map;
 
 public class Backend {
+    private static final String TAG = "Backend";
     static private Backend instance;
     private TACNET tacnet;
     private Config config;
@@ -16,7 +35,7 @@ public class Backend {
         instance = this;
 
         loadSettings();
-        if (settings.config != null) {
+        if (!settings.config.isEmpty()) {
             loadConfig(settings.config);
         }
         tacnet = new TACNET();
@@ -84,28 +103,94 @@ public class Backend {
         settingsChanged = true;
     }
 
-    public boolean isSettingsChanged() {
+    public boolean haveSettingsChanged() {
         return settingsChanged;
     }
 
-    public boolean loadSettings() {
-        return false;
+    public void loadSettings() {
+        File settingsFile = new File(TAC.SETTINGS_PATH);
+
+        if (!settingsFile.exists()) {
+            Log.i(TAG, "Writing default settings.json");
+            writeDefaultSettings();
+        }
+
+        try {
+            settings = gsonForSettings().fromJson(new FileReader(settingsFile), Settings.class);
+        } catch (FileNotFoundException e) {
+            // TODO
+            Log.e(TAG, "Unable to load settings.json");
+        }
     }
 
     public void saveSettings() {
-
+        Log.i(TAG, "Settings: " + gsonForSettings().toJson(settings));
+        writeToFile(TAC.SETTINGS_PATH, gsonForSettings().toJson(settings));
     }
 
     public void writeDefaultSettings() {
-        /*
-        {
-            "data":
-                {
-                    "hostname":TACNET.DEFAULT_HOSTNAME,
-                    "port":TACNET.DEFAULT_PORT,
-                    "config":null,
-                }
+        settings = new Settings(TACNET.DEFAULT_HOSTNAME, TACNET.DEFAULT_PORT, "");
+        saveSettings();
+    }
+
+    private Gson gsonForSettings() {
+        return new GsonBuilder()
+                .registerTypeAdapter(Settings.class, new SettingsSerializer())
+                .registerTypeAdapter(Settings.class, new SettingsDeserializer())
+                .create();
+    }
+
+    private String readFromFile(String path) {
+        StringBuilder text = new StringBuilder();
+
+        try {
+            BufferedReader br = new BufferedReader( new FileReader(path) );
+            String line;
+
+            while((line = br.readLine()) != null) {
+                text.append(line);
+                text.append("\n");
+            }
+
+            br.close();
+        } catch (IOException e) {
+            // TODO
+        }
+
+        return text.toString();
+    }
+
+    protected boolean writeToFile(String filePath, String content) {
+        try {
+            if (filePath.startsWith(TAC.ROOT_PATH)) {
+                createFolders(filePath);
+
+                FileWriter writer = new FileWriter(filePath);
+                writer.write(content);
+                writer.close();
+
+                return true;
+            } else {
+                Log.e(TAG, "writeToFile disallowed path: " + filePath);
+                return false;
+            }
+
+        } catch (IOException e) {
+            Log.e(TAG, e.getLocalizedMessage());
+            return false;
+        }
+    }
+
+    private void createFolders(String filePath) throws IOException {
+        File rootPath = new File(TAC.ROOT_PATH);
+        File configsPath = new File(TAC.CONFIGS_PATH);
+
+        if (!rootPath.exists()) {
+            rootPath.mkdir();
+        }
+
+        if (!configsPath.exists()) {
+            configsPath.mkdir();
         }
-         */
     }
 }

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/dialogs/Dialog.java

@@ -1,45 +1,43 @@
 package org.timecrafters.TimeCraftersConfigurationTool.dialogs;
 
-import android.app.ActionBar;
-import android.content.Context;
 import android.graphics.Point;
 import android.os.Bundle;
-import android.util.DisplayMetrics;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.Window;
-import android.view.WindowManager;
-import android.widget.Button;
 import android.widget.ImageButton;
 
-import androidx.annotation.NonNull;
+import androidx.fragment.app.DialogFragment;
 
 import org.timecrafters.TimeCraftersConfigurationTool.R;
 
-public class Dialog extends android.app.Dialog {
-    public Dialog(@NonNull Context context) {
-        super(context);
+public class Dialog extends DialogFragment {
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        View v = View.inflate(getContext(), R.layout.dialog_base, null);
+
+        ImageButton closeButton = v.findViewById(R.id.dialogCloseButton);
+
+        if (isCancelable()) {
+            closeButton.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    dismiss();
+                }
+            });
+        } else {
+            closeButton.setVisibility(View.GONE);
+        }
+
+        return v;
     }
 
     @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        requestWindowFeature(Window.FEATURE_NO_TITLE);
-        setContentView(R.layout.dialog_base);
+    public void onStart() {
+        super.onStart();
 
-        ImageButton closeButton = findViewById(R.id.dialogCloseButton);
-        closeButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                dismiss();
-            }
-        });
-    }
-
-    @Override
-    protected void onStart() {
         Point point = new Point();
-        getWindow().getWindowManager().getDefaultDisplay().getSize(point);
-        getWindow().setLayout((int) (point.x * 0.75), ViewGroup.LayoutParams.WRAP_CONTENT);
+        getActivity().getWindowManager().getDefaultDisplay().getSize(point);
+        getDialog().getWindow().setLayout((int) (point.x * 0.8), ViewGroup.LayoutParams.WRAP_CONTENT);
     }
 }

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/dialogs/PermissionsRequestDialog.java

@@ -0,0 +1,53 @@
+package org.timecrafters.TimeCraftersConfigurationTool.dialogs;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+
+import org.timecrafters.TimeCraftersConfigurationTool.MainActivity;
+import org.timecrafters.TimeCraftersConfigurationTool.R;
+import org.timecrafters.TimeCraftersConfigurationTool.backend.Backend;
+import org.timecrafters.TimeCraftersConfigurationTool.backend.TAC;
+
+public class PermissionsRequestDialog extends Dialog {
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        setCancelable(false);
+
+        View v = super.onCreateView(inflater, container, savedInstanceState);
+
+        ((TextView)v.findViewById(R.id.dialogTitle)).setText("Storage Permission Required");
+        LinearLayout view = v.findViewById(R.id.dialogContent);
+        view.addView(getLayoutInflater().inflate(R.layout.dialog_permission_request, null));
+        ((TextView)view.findViewById(R.id.message)).setText("Permission is required to write to external storage:\n\n" + TAC.ROOT_PATH);
+
+        Button quitButton = view.findViewById(R.id.quit_button);
+        Button continueButton = view.findViewById(R.id.continue_button);
+
+        quitButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+            dismiss();
+            ((MainActivity) getActivity()).close();
+            }
+        });
+
+        continueButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                dismiss();
+                ((MainActivity) getActivity()).requestStoragePermissions();
+            }
+        });
+
+
+        return v;
+    }
+}

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/dialogs/VariableDialog.java

@@ -0,0 +1,42 @@
+package org.timecrafters.TimeCraftersConfigurationTool.dialogs;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import org.timecrafters.TimeCraftersConfigurationTool.R;
+
+public class VariableDialog extends Dialog {
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        setCancelable(false);
+
+        View v = super.onCreateView(inflater, container, savedInstanceState);
+
+        ((TextView)v.findViewById(R.id.dialogTitle)).setText("Add Variable");
+        LinearLayout view = v.findViewById(R.id.dialogContent);
+        view.addView(getLayoutInflater().inflate(R.layout.dialog_edit_variable, null));
+
+        Button cancelButton = view.findViewById(R.id.cancel);
+        Button mutateButton = view.findViewById(R.id.mutate);
+        cancelButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                dismiss();
+            }
+        });
+
+        mutateButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                dismiss();
+            }
+        });
+
+        return v;
+    }
+}

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/serializers/SettingsDeserializer.java

@@ -0,0 +1,25 @@
+package org.timecrafters.TimeCraftersConfigurationTool.serializers;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+
+import org.timecrafters.TimeCraftersConfigurationTool.backend.Settings;
+
+import java.lang.reflect.Type;
+
+public class SettingsDeserializer implements JsonDeserializer<Settings> {
+    @Override
+    public Settings deserialize(JsonElement json, Type type, JsonDeserializationContext context) throws JsonParseException {
+        JsonObject jsonObject = json.getAsJsonObject();
+        JsonObject data = jsonObject.get("data").getAsJsonObject();
+
+        return new Settings(
+                    data.get("hostname").getAsString(),
+                    data.get("port").getAsInt(),
+                    data.get("config").getAsString()
+                );
+    }
+}

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/serializers/SettingsSerializer.java

@@ -0,0 +1,30 @@
+package org.timecrafters.TimeCraftersConfigurationTool.serializers;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+
+import org.timecrafters.TimeCraftersConfigurationTool.backend.Settings;
+
+import java.lang.reflect.Type;
+
+public class SettingsSerializer implements JsonSerializer<Settings> {
+    @Override
+    public JsonElement serialize(Settings settings, Type type, JsonSerializationContext context) {
+        JsonObject container = new JsonObject();
+        JsonObject result = new JsonObject();
+        result.add("hostname", new JsonPrimitive(settings.hostname));
+        result.add("port", new JsonPrimitive(settings.port));
+        result.add("config", new JsonPrimitive(settings.config));
+
+        container.add("data", result);
+
+        return container;
+    }
+}
+

app/src/main/java/org/timecrafters/TimeCraftersConfigurationTool/ui/tacnet/TACNETFragment.java

@@ -5,8 +5,6 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
-import android.widget.LinearLayout;
-import android.widget.TextView;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -15,9 +13,7 @@ import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModelProviders;
 
 import org.timecrafters.TimeCraftersConfigurationTool.R;
-import org.timecrafters.TimeCraftersConfigurationTool.dialogs.Dialog;
-
-import static android.view.View.inflate;
+import org.timecrafters.TimeCraftersConfigurationTool.dialogs.VariableDialog;
 
 public class TACNETFragment extends Fragment {
 
@@ -38,12 +34,8 @@ public class TACNETFragment extends Fragment {
         connect.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                Dialog dialog = new Dialog(getContext());
-                dialog.show();
-
-                ((TextView)dialog.findViewById(R.id.dialogTitle)).setText("Add Variable");
-                LinearLayout view = dialog.findViewById(R.id.dialogContent);
-                view.addView(getLayoutInflater().inflate(R.layout.dialog_edit_variable, null));
+                VariableDialog dialog = new VariableDialog();
+                dialog.show(getFragmentManager(), null);
             }
         });
 

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

@@ -65,14 +65,14 @@
         android:orientation="horizontal">
 
         <Button
-            android:id="@+id/button"
+            android:id="@+id/cancel"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_weight="1"
             android:text="@string/dialog_cancel" />
 
         <Button
-            android:id="@+id/button3"
+            android:id="@+id/mutate"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_weight="1"

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

@@ -0,0 +1,42 @@
+<?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">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <TextView
+            android:id="@+id/message"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textColor="@android:color/black" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal">
+
+            <Button
+                android:id="@+id/quit_button"
+                android:layout_width="0dip"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Quit" />
+
+            <Button
+                android:id="@+id/continue_button"
+                android:layout_width="0dip"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Continue" />
+        </LinearLayout>
+
+    </LinearLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>