Lots of progress with dynamic theming, the nav drawer now uses a RecyclerView, AboutDeveloperDialogHelper is now a DialogFragment, RTL support (to suppress Lint warnings), other various small fixes, cleaned up and formatted lot of code (and removed un-used resources), R.string.ok > android.R.string.ok, R.string.cancel > android.R.string.cancel, switched dialog helpers to DialogFragments.

app/src/main/java/com/kabouzeid/gramophone/prefs/ColorChooserPreference.java

@@ -0,0 +1,56 @@
+package com.kabouzeid.gramophone.prefs;
+
+import android.content.Context;
+import android.preference.Preference;
+import android.support.annotation.NonNull;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.views.CircleView;
+
+public class ColorChooserPreference extends Preference {
+
+    private View mView;
+    private int color;
+    private int border;
+
+    public ColorChooserPreference(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public ColorChooserPreference(Context context) {
+        this(context, null, 0);
+    }
+
+    public ColorChooserPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        setLayoutResource(R.layout.preference_custom);
+    }
+
+    @Override
+    protected void onBindView(@NonNull View view) {
+        super.onBindView(view);
+        mView = view;
+        invalidateColor();
+    }
+
+    public void setColor(int color, int border) {
+        this.color = color;
+        this.border = border;
+        invalidateColor();
+    }
+
+    private void invalidateColor() {
+        if (mView != null) {
+            CircleView circle = (CircleView) mView.findViewById(R.id.circle);
+            if (this.color != 0) {
+                circle.setVisibility(View.VISIBLE);
+                circle.setBackgroundColor(color);
+                circle.setBorderColor(border);
+            } else {
+                circle.setVisibility(View.GONE);
+            }
+        }
+    }
+}

app/src/main/java/com/kabouzeid/gramophone/prefs/DynamicPreferenceCategory.java

@@ -0,0 +1,39 @@
+package com.kabouzeid.gramophone.prefs;
+
+import android.content.Context;
+import android.preference.PreferenceCategory;
+import android.support.annotation.NonNull;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.TextView;
+
+import com.afollestad.materialdialogs.ThemeSingleton;
+import com.kabouzeid.gramophone.R;
+
+/**
+ * Uses the theme's primary color as the text color of the category.
+ *
+ * @author Aidan Follestad (afollestad)
+ */
+public class DynamicPreferenceCategory extends PreferenceCategory {
+
+    public DynamicPreferenceCategory(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public DynamicPreferenceCategory(Context context) {
+        this(context, null, 0);
+    }
+
+    public DynamicPreferenceCategory(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        setLayoutResource(R.layout.preference_category_custom);
+        setSelectable(false);
+    }
+
+    @Override
+    protected void onBindView(@NonNull View view) {
+        super.onBindView(view);
+        ((TextView) view.findViewById(android.R.id.title)).setTextColor(ThemeSingleton.get().positiveColor);
+    }
+}