Adapt example app to show heading configuration options

app/build.gradle

@@ -36,4 +36,6 @@ dependencies {
 
     compile 'com.google.dagger:dagger:2.10'
     annotationProcessor 'com.google.dagger:dagger-compiler:2.10'
+
+    implementation "com.android.support:appcompat-v7:27.0.2"
 }

app/src/main/java/ru/noties/markwon/MarkdownRenderer.java

@@ -1,11 +1,15 @@
 package ru.noties.markwon;
 
 import android.content.Context;
+import android.graphics.Color;
+import android.graphics.Typeface;
 import android.net.Uri;
 import android.os.Handler;
 import android.os.SystemClock;
+import android.support.annotation.FontRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.v4.content.res.ResourcesCompat;
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Future;
@@ -14,13 +18,14 @@ import javax.inject.Inject;
 
 import ru.noties.debug.Debug;
 import ru.noties.markwon.spans.AsyncDrawable;
+import ru.noties.markwon.spans.SpannableTheme;
+import ru.noties.markwon.spans.heading.HeadingConfig;
+import ru.noties.markwon.spans.heading.HeadingTypeConfig;
 
 @ActivityScope
 public class MarkdownRenderer {
 
-    interface MarkdownReadyListener {
-        void onMarkdownReady(CharSequence markdown);
-    }
+    private final Context context;
 
     @Inject
     AsyncDrawable.Loader loader;
@@ -34,14 +39,15 @@ public class MarkdownRenderer {
     private Future<?> task;
 
     @Inject
-    MarkdownRenderer() {
+    MarkdownRenderer(Context context) {
+        this.context = context;
     }
 
     public void render(
-            @NonNull final Context context,
-            @Nullable final Uri uri,
-            @NonNull final String markdown,
-            @NonNull final MarkdownReadyListener listener) {
+        @NonNull final Context context,
+        @Nullable final Uri uri,
+        @NonNull final String markdown,
+        @NonNull final MarkdownReadyListener listener) {
         cancel();
         task = service.submit(new Runnable() {
             @Override
@@ -55,9 +61,10 @@ public class MarkdownRenderer {
                 }
 
                 final SpannableConfiguration configuration = SpannableConfiguration.builder(context)
-                        .asyncDrawableLoader(loader)
-                        .urlProcessor(urlProcessor)
-                        .build();
+                    .theme(getSpannableTheme())
+                    .asyncDrawableLoader(loader)
+                    .urlProcessor(urlProcessor)
+                    .build();
 
                 final long start = SystemClock.uptimeMillis();
 
@@ -92,4 +99,25 @@ public class MarkdownRenderer {
     private boolean isCancelled() {
         return task == null || task.isCancelled();
     }
+
+    private HeadingConfig getHeadingConfig() {
+        final HeadingTypeConfig h1 = new HeadingTypeConfig(-1, Color.RED, getTypeface(R.font.opensans_semibold));
+        final HeadingTypeConfig h2 = new HeadingTypeConfig(-1, Color.BLUE, getTypeface(R.font.opensans_regular));
+
+        return new HeadingConfig(h1, h2);
+    }
+
+    private SpannableTheme getSpannableTheme() {
+        return SpannableTheme.builderWithDefaults(context)
+            .headingConfig(getHeadingConfig(), context.getResources().getDisplayMetrics().density)
+            .build();
+    }
+
+    private Typeface getTypeface(@FontRes int font){
+        return ResourcesCompat.getFont(context, font);
+    }
+
+    interface MarkdownReadyListener {
+        void onMarkdownReady(CharSequence markdown);
+    }
 }

app/src/main/res/font/app_font.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<font-family
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <!-- Regular -->
+    <font
+        android:font="@font/opensans_regular"
+        android:fontStyle="normal"
+        android:fontWeight="400"
+
+        app:font="@font/opensans_regular"
+        app:fontStyle="normal"
+        app:fontWeight="400"/>
+
+    <!-- Semi-bold -->
+    <font
+        android:font="@font/opensans_semibold"
+        android:fontStyle="normal"
+        android:fontWeight="700"
+
+        app:font="@font/opensans_semibold"
+        app:fontStyle="normal"
+        app:fontWeight="700"/>
+</font-family>