Remove bitmap drawables and let Android Studio generate the at build time

Tested on virtual Android 8.1, 5.0 and an API Level 14. 14 showed some visual glitches (Some minor parts of the icons are black) - But i think it's a good trade-off. Everything still works.

app/src/main/java/it/niedermann/owncloud/notes/android/activity/NotesListViewActivity.java

@@ -328,7 +328,7 @@ public class NotesListViewActivity extends AppCompatActivity implements ItemAdap
 
     private void setupNavigationMenu() {
         final NavigationAdapter.NavigationItem itemSettings = new NavigationAdapter.NavigationItem("settings", getString(R.string.action_settings), null, R.drawable.ic_settings_grey600_24dp);
-        final NavigationAdapter.NavigationItem itemAbout = new NavigationAdapter.NavigationItem("about", getString(R.string.simple_about), null, R.drawable.ic_information_outline_grey600_24dp);
+        final NavigationAdapter.NavigationItem itemAbout = new NavigationAdapter.NavigationItem("about", getString(R.string.simple_about), null, R.drawable.ic_info_outline_grey600_24dp);
 
         ArrayList<NavigationAdapter.NavigationItem> itemsMenu = new ArrayList<>();
         itemsMenu.add(itemSettings);

app/src/main/java/it/niedermann/owncloud/notes/android/fragment/BaseNoteFragment.java

@@ -103,7 +103,7 @@ public abstract class BaseNoteFragment extends Fragment implements CategoryDialo
     }
 
     private void prepareFavoriteOption(MenuItem item) {
-        item.setIcon(note.isFavorite() ? R.drawable.ic_star_white_24dp : R.drawable.ic_star_outline_white_24dp);
+        item.setIcon(note.isFavorite() ? R.drawable.ic_star_white_24dp : R.drawable.ic_star_border_white_24dp);
         item.setChecked(note.isFavorite());
     }
 

app/src/main/java/it/niedermann/owncloud/notes/model/ItemAdapter.java

@@ -103,7 +103,7 @@ public class ItemAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
             nvHolder.noteCategory.setText(NoteUtil.extendCategory(note.getCategory()));
             nvHolder.noteExcerpt.setText(note.getExcerpt());
             nvHolder.noteStatus.setVisibility(DBStatus.VOID.equals(note.getStatus()) ? View.INVISIBLE : View.VISIBLE);
-            nvHolder.noteFavorite.setImageResource(note.isFavorite() ? R.drawable.ic_star_grey600_24dp : R.drawable.ic_star_outline_grey600_24dp);
+            nvHolder.noteFavorite.setImageResource(note.isFavorite() ? R.drawable.ic_star_grey600_24dp : R.drawable.ic_star_border_grey600_24dp);
             nvHolder.noteFavorite.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View view) {

app/src/main/java/it/niedermann/owncloud/notes/model/NavigationAdapter.java

@@ -24,15 +24,15 @@ public class NavigationAdapter extends RecyclerView.Adapter<NavigationAdapter.Vi
     @DrawableRes
     public static final int ICON_FOLDER = R.drawable.ic_folder_grey600_24dp;
     @DrawableRes
-    public static final int ICON_NOFOLDER = R.drawable.ic_folder_outline_grey600_24dp;
+    public static final int ICON_NOFOLDER = R.drawable.ic_folder_open_grey600_24dp;
     @DrawableRes
     public static final int ICON_SUB_FOLDER = R.drawable.ic_folder_grey600_18dp;
     @DrawableRes
-    public static final int ICON_MULTIPLE = R.drawable.ic_folder_plus_grey600_24dp; //R.drawable.ic_folder_multiple_grey600_24dp;
+    public static final int ICON_MULTIPLE = R.drawable.ic_create_new_folder_grey600_24dp;
     @DrawableRes
-    public static final int ICON_MULTIPLE_OPEN = R.drawable.ic_folder_grey600_24dp; //R.drawable.ic_folder_multiple_outline_grey600_24dp;
+    public static final int ICON_MULTIPLE_OPEN = R.drawable.ic_folder_grey600_24dp;
     @DrawableRes
-    public static final int ICON_SUB_MULTIPLE = R.drawable.ic_folder_plus_grey600_18dp; //R.drawable.ic_folder_multiple_grey600_18dp;
+    public static final int ICON_SUB_MULTIPLE = R.drawable.ic_create_new_folder_grey600_18dp;
 
     public static class NavigationItem {
         @NonNull

app/src/main/res/drawable/ic_create_new_folder_grey600_18dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="18dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="18dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M20,6h-8l-2,-2L4,4c-1.11,0 -1.99,0.89 -1.99,2L2,18c0,1.11 0.89,2 2,2h16c1.11,0 2,-0.89 2,-2L22,8c0,-1.11 -0.89,-2 -2,-2zM19,14h-3v3h-2v-3h-3v-2h3L14,9h2v3h3v2z"/>
+</vector>

app/src/main/res/drawable/ic_create_new_folder_grey600_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M20,6h-8l-2,-2L4,4c-1.11,0 -1.99,0.89 -1.99,2L2,18c0,1.11 0.89,2 2,2h16c1.11,0 2,-0.89 2,-2L22,8c0,-1.11 -0.89,-2 -2,-2zM19,14h-3v3h-2v-3h-3v-2h3L14,9h2v3h3v2z"/>
+</vector>

app/src/main/res/drawable/ic_edit_white_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z"/>
+</vector>

app/src/main/res/drawable/ic_eye_white_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M12,4.5C7,4.5 2.73,7.61 1,12c1.73,4.39 6,7.5 11,7.5s9.27,-3.11 11,-7.5c-1.73,-4.39 -6,-7.5 -11,-7.5zM12,17c-2.76,0 -5,-2.24 -5,-5s2.24,-5 5,-5 5,2.24 5,5 -2.24,5 -5,5zM12,9c-1.66,0 -3,1.34 -3,3s1.34,3 3,3 3,-1.34 3,-3 -1.34,-3 -3,-3z"/>
+</vector>

app/src/main/res/drawable/ic_folder_grey600_18dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="18dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="18dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M10,4H4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V8c0,-1.1 -0.9,-2 -2,-2h-8l-2,-2z"/>
+</vector>

app/src/main/res/drawable/ic_folder_grey600_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M10,4H4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V8c0,-1.1 -0.9,-2 -2,-2h-8l-2,-2z"/>
+</vector>

app/src/main/res/drawable/ic_folder_open_grey600_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M20,6h-8l-2,-2L4,4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2L22,8c0,-1.1 -0.9,-2 -2,-2zM20,18L4,18L4,8h16v10z"/>
+</vector>

app/src/main/res/drawable/ic_info_outline_grey600_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M11,17h2v-6h-2v6zM12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM12,20c-4.41,0 -8,-3.59 -8,-8s3.59,-8 8,-8 8,3.59 8,8 -3.59,8 -8,8zM11,9h2L13,7h-2v2z"/>
+</vector>

app/src/main/res/drawable/ic_settings_grey600_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M19.43,12.98c0.04,-0.32 0.07,-0.64 0.07,-0.98s-0.03,-0.66 -0.07,-0.98l2.11,-1.65c0.19,-0.15 0.24,-0.42 0.12,-0.64l-2,-3.46c-0.12,-0.22 -0.39,-0.3 -0.61,-0.22l-2.49,1c-0.52,-0.4 -1.08,-0.73 -1.69,-0.98l-0.38,-2.65C14.46,2.18 14.25,2 14,2h-4c-0.25,0 -0.46,0.18 -0.49,0.42l-0.38,2.65c-0.61,0.25 -1.17,0.59 -1.69,0.98l-2.49,-1c-0.23,-0.09 -0.49,0 -0.61,0.22l-2,3.46c-0.13,0.22 -0.07,0.49 0.12,0.64l2.11,1.65c-0.04,0.32 -0.07,0.65 -0.07,0.98s0.03,0.66 0.07,0.98l-2.11,1.65c-0.19,0.15 -0.24,0.42 -0.12,0.64l2,3.46c0.12,0.22 0.39,0.3 0.61,0.22l2.49,-1c0.52,0.4 1.08,0.73 1.69,0.98l0.38,2.65c0.03,0.24 0.24,0.42 0.49,0.42h4c0.25,0 0.46,-0.18 0.49,-0.42l0.38,-2.65c0.61,-0.25 1.17,-0.59 1.69,-0.98l2.49,1c0.23,0.09 0.49,0 0.61,-0.22l2,-3.46c0.12,-0.22 0.07,-0.49 -0.12,-0.64l-2.11,-1.65zM12,15.5c-1.93,0 -3.5,-1.57 -3.5,-3.5s1.57,-3.5 3.5,-3.5 3.5,1.57 3.5,3.5 -1.57,3.5 -3.5,3.5z"/>
+</vector>

app/src/main/res/drawable/ic_star_border_grey600_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M22,9.24l-7.19,-0.62L12,2 9.19,8.63 2,9.24l5.46,4.73L5.82,21 12,17.27 18.18,21l-1.63,-7.03L22,9.24zM12,15.4l-3.76,2.27 1,-4.28 -3.32,-2.88 4.38,-0.38L12,6.1l1.71,4.04 4.38,0.38 -3.32,2.88 1,4.28L12,15.4z"/>
+</vector>

app/src/main/res/drawable/ic_star_border_white_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M22,9.24l-7.19,-0.62L12,2 9.19,8.63 2,9.24l5.46,4.73L5.82,21 12,17.27 18.18,21l-1.63,-7.03L22,9.24zM12,15.4l-3.76,2.27 1,-4.28 -3.32,-2.88 4.38,-0.38L12,6.1l1.71,4.04 4.38,0.38 -3.32,2.88 1,4.28L12,15.4z"/>
+</vector>

app/src/main/res/drawable/ic_star_grey600_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#757575" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M12,17.27L18.18,21l-1.64,-7.03L22,9.24l-7.19,-0.61L12,2 9.19,8.63 2,9.24l5.46,4.73L5.82,21z"/>
+</vector>

app/src/main/res/drawable/ic_star_white_24dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:tint="#FFFFFF" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M12,17.27L18.18,21l-1.64,-7.03L22,9.24l-7.19,-0.61L12,2 9.19,8.63 2,9.24l5.46,4.73L5.82,21z"/>
+</vector>

app/src/main/res/drawable/ic_sync_blue_18dp.xml

@@ -0,0 +1,5 @@
+<vector android:autoMirrored="true" android:height="18dp"
+    android:tint="#2268AB" android:viewportHeight="24.0"
+    android:viewportWidth="24.0" android:width="18dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M12,4L12,1L8,5l4,4L12,6c3.31,0 6,2.69 6,6 0,1.01 -0.25,1.97 -0.7,2.8l1.46,1.46C19.54,15.03 20,13.57 20,12c0,-4.42 -3.58,-8 -8,-8zM12,18c-3.31,0 -6,-2.69 -6,-6 0,-1.01 0.25,-1.97 0.7,-2.8L5.24,7.74C4.46,8.97 4,10.43 4,12c0,4.42 3.58,8 8,8v3l4,-4 -4,-4v3z"/>
+</vector>

app/src/main/res/menu/menu_note_activity.xml

@@ -9,7 +9,7 @@
         app:showAsAction="ifRoom" />
     <item
         android:id="@+id/menu_edit"
-        android:icon="@drawable/ic_action_edit_24dp"
+        android:icon="@drawable/ic_edit_white_24dp"
         android:orderInCategory="50"
         android:title="@string/simple_edit"
         app:showAsAction="ifRoom" />