Adds basic dark mode.

app/src/main/java/org/secuso/privacyfriendlynotes/ui/adapter/NoteAdapter.java

@@ -71,18 +71,18 @@ public void onBindViewHolder(@NonNull NoteHolder holder, int position) {
 
         switch (currentNote.getType()) {
             case DbContract.NoteEntry.TYPE_TEXT:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_short_text_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_short_text_icon_24dp);
                 holder.textViewDescription.setText(Html.fromHtml(currentNote.getContent()));
                 holder.textViewDescription.setMaxLines(3);
                 break;
             case DbContract.NoteEntry.TYPE_AUDIO:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_mic_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_mic_icon_24dp);
                 break;
             case DbContract.NoteEntry.TYPE_SKETCH:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_photo_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_photo_icon_24dp);
                 break;
             case DbContract.NoteEntry.TYPE_CHECKLIST:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_format_list_bulleted_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_format_list_bulleted_icon_24dp);
                 String preview = "";
                 try {
                     JSONArray content = new JSONArray(currentNote.getContent());

app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.java → app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.kt

@@ -11,20 +11,25 @@
  You should have received a copy of the GNU General Public License
  along with Privacy Friendly Notes. If not, see <http://www.gnu.org/licenses/>.
  */
-package org.secuso.privacyfriendlynotes.ui.fragments;
+package org.secuso.privacyfriendlynotes.ui.fragments
 
-import android.os.Bundle;
-import android.preference.PreferenceFragment;
-
-import org.secuso.privacyfriendlynotes.R;
+import android.os.Bundle
+import android.preference.PreferenceFragment
+import androidx.appcompat.app.AppCompatDelegate
+import org.secuso.privacyfriendlynotes.R
 
 /**
  * Fragment that provides the settings.
  * Created by Robin on 11.09.2016.
  */
-public class SettingsFragment extends PreferenceFragment {
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        addPreferencesFromResource(R.xml.pref_settings);
+class SettingsFragment : PreferenceFragment() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        addPreferencesFromResource(R.xml.pref_settings)
+        findPreference("settings_day_night_theme")?.setOnPreferenceChangeListener { _, newValue ->
+            AppCompatDelegate.setDefaultNightMode(newValue.toString().toInt())
+            true;
+        }
+
     }
 }

app/src/main/java/org/secuso/privacyfriendlynotes/ui/main/MainActivity.java

@@ -15,6 +15,7 @@
 
 import android.app.Activity;
 import android.content.Intent;
+import android.graphics.drawable.ColorDrawable;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import com.google.android.material.navigation.NavigationView;
@@ -24,8 +25,10 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import android.util.Log;
 import android.widget.SearchView;
 
+import androidx.appcompat.app.AppCompatDelegate;
 import androidx.arch.core.util.Function;
 import androidx.core.view.GravityCompat;
 import androidx.appcompat.app.ActionBarDrawerToggle;
@@ -107,7 +110,7 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.activity_main);
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
-
+        getSupportActionBar().setStackedBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.colorPrimary)));
         //set the OnClickListeners
         findViewById(R.id.fab_text).setOnClickListener(this);
         findViewById(R.id.fab_checklist).setOnClickListener(this);
@@ -208,6 +211,10 @@ public boolean onQueryTextSubmit(String query) {
         });
 
         PreferenceManager.setDefaultValues(this, R.xml.pref_settings, false);
+
+        String theme = PreferenceManager.getDefaultSharedPreferences(this).getString("settings_day_night_theme", "-1");
+        Log.d("Theme", theme);
+        AppCompatDelegate.setDefaultNightMode(Integer.parseInt(theme));
     }
 
     @Override

app/src/main/java/org/secuso/privacyfriendlynotes/ui/notes/AudioNoteActivity.kt

@@ -254,9 +254,9 @@ class AudioNoteActivity : BaseNoteActivity(DbContract.NoteEntry.TYPE_AUDIO) {
 
     private fun togglePlayPauseButton() {
         if (playing) {
-            btnPlayPause.setBackgroundResource(R.drawable.ic_pause_black_24dp)
+            btnPlayPause.setBackgroundResource(R.drawable.ic_pause_icon_24dp)
         } else {
-            btnPlayPause.setBackgroundResource(R.drawable.ic_play_arrow_black_24dp)
+            btnPlayPause.setBackgroundResource(R.drawable.ic_play_arrow_icon_24dp)
         }
     }
 

app/src/main/res/drawable/ic_format_list_bulleted_black_24dp.xml → app/src/main/res/drawable/ic_format_list_bulleted_icon_24dp.xml

@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M4,10.5c-0.83,0 -1.5,0.67 -1.5,1.5s0.67,1.5 1.5,1.5 1.5,-0.67 1.5,-1.5 -0.67,-1.5 -1.5,-1.5zM4,4.5c-0.83,0 -1.5,0.67 -1.5,1.5S3.17,7.5 4,7.5 5.5,6.83 5.5,6 4.83,4.5 4,4.5zM4,16.67c-0.74,0 -1.33,0.6 -1.33,1.33s0.6,1.33 1.33,1.33 1.33,-0.6 1.33,-1.33 -0.59,-1.33 -1.33,-1.33zM7,19h14v-2L7,17v2zM7,13h14v-2L7,11v2zM7,5v2h14L21,5L7,5z"/>
 </vector>

app/src/main/res/drawable/ic_mic_black_24dp.xml → app/src/main/res/drawable/ic_mic_icon_24dp.xml

@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M12,14c1.66,0 2.99,-1.34 2.99,-3L15,5c0,-1.66 -1.34,-3 -3,-3S9,3.34 9,5v6c0,1.66 1.34,3 3,3zM17.3,11c0,3 -2.54,5.1 -5.3,5.1S6.7,14 6.7,11L5,11c0,3.41 2.72,6.23 6,6.72L11,21h2v-3.28c3.28,-0.48 6,-3.3 6,-6.72h-1.7z"/>
 </vector>

app/src/main/res/drawable/ic_pause_black_24dp.xml → app/src/main/res/drawable/ic_pause_icon_24dp.xml

@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M6,19h4L10,5L6,5v14zM14,5v14h4L18,5h-4z"/>
 </vector>

app/src/main/res/drawable/ic_photo_black_24dp.xml → app/src/main/res/drawable/ic_photo_icon_24dp.xml

@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M21,19V5c0,-1.1 -0.9,-2 -2,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2zM8.5,13.5l2.5,3.01L14.5,12l4.5,6H5l3.5,-4.5z"/>
 </vector>

app/src/main/res/drawable/ic_play_arrow_black_24dp.xml → app/src/main/res/drawable/ic_play_arrow_icon_24dp.xml

@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M8,5v14l11,-7z"/>
 </vector>

app/src/main/res/drawable/ic_short_text_black_24dp.xml → app/src/main/res/drawable/ic_short_text_icon_24dp.xml

@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M4,9h16v2L4,11zM4,13h10v2L4,15z"/>
 </vector>