added PrecomputedFutureTextSetterCompat with tests in the sample app

build.gradle

@@ -66,6 +66,7 @@ ext {
             'x-annotations'           : 'androidx.annotation:annotation:1.1.0',
             'x-recycler-view'         : 'androidx.recyclerview:recyclerview:1.0.0',
             'x-core'                  : 'androidx.core:core:1.0.2',
+            'x-appcompat'             : 'androidx.appcompat:appcompat:1.1.0',
             'commonmark'              : "com.atlassian.commonmark:commonmark:$commonMarkVersion",
             'commonmark-strikethrough': "com.atlassian.commonmark:commonmark-ext-gfm-strikethrough:$commonMarkVersion",
             'commonmark-table'        : "com.atlassian.commonmark:commonmark-ext-gfm-tables:$commonMarkVersion",

markwon-core/build.gradle

@@ -22,6 +22,7 @@ dependencies {
         // @since 4.1.0 to allow PrecomputedTextSetterCompat
         // note that this dependency must be added on a client side explicitly
         compileOnly it['x-core']
+        compileOnly it['x-appcompat']
     }
 
     deps['test'].with {

markwon-core/src/main/java/io/noties/markwon/PrecomputedFutureTextSetterCompat.java

@@ -0,0 +1,61 @@
+package io.noties.markwon;
+
+import android.text.Spanned;
+import android.util.Log;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.AppCompatTextView;
+import androidx.core.text.PrecomputedTextCompat;
+
+import java.util.concurrent.Executor;
+
+/**
+ * Please note this class requires `androidx.core:core` artifact being explicitly added to your dependencies.
+ * This is intended to be used in a RecyclerView.
+ *
+ * @see io.noties.markwon.Markwon.TextSetter
+ */
+public class PrecomputedFutureTextSetterCompat implements Markwon.TextSetter {
+
+    /**
+     * @param executor for background execution of text pre-computation,
+     *                 if not provided the standard, single threaded one will be used.
+     */
+    @NonNull
+    public static PrecomputedFutureTextSetterCompat create(@Nullable Executor executor) {
+        return new PrecomputedFutureTextSetterCompat(executor);
+    }
+
+    @NonNull
+    public static PrecomputedFutureTextSetterCompat create() {
+        return new PrecomputedFutureTextSetterCompat(null);
+    }
+
+    @Nullable
+    private final Executor executor;
+
+    @SuppressWarnings("WeakerAccess")
+    PrecomputedFutureTextSetterCompat(@Nullable Executor executor) {
+        this.executor = executor;
+    }
+
+    @Override
+    public void setText(
+            @NonNull TextView textView,
+            @NonNull Spanned markdown,
+            @NonNull TextView.BufferType bufferType,
+            @NonNull Runnable onComplete) {
+
+        if (textView instanceof AppCompatTextView) {
+            ((AppCompatTextView) textView).setTextFuture(PrecomputedTextCompat.getTextFuture(
+                    markdown, ((AppCompatTextView) textView).getTextMetricsParamsCompat(), executor
+            ));
+
+            onComplete.run();
+        } else {
+            Log.w("Markwon, no-op", "PrecomputedFutureTextSetterCompat: textView provided is not an AppCompatTextView!");
+        }
+    }
+}

sample/build.gradle

@@ -54,6 +54,7 @@ dependencies {
     deps.with {
         implementation it['x-recycler-view']
         implementation it['x-core'] // for precomputedTextCompat
+        implementation it['x-appcompat'] // for setTextFuture
         implementation it['okhttp']
         implementation it['prism4j']
         implementation it['debug']

sample/src/main/AndroidManifest.xml

@@ -28,6 +28,7 @@
         <activity android:name=".simpleext.SimpleExtActivity" />
         <activity android:name=".customextension2.CustomExtensionActivity2" />
         <activity android:name=".precomputed.PrecomputedActivity" />
+        <activity android:name=".precomputed.PrecomputedFutureActivity" />
 
         <activity
             android:name=".editor.EditorActivity"

sample/src/main/java/io/noties/markwon/sample/MainActivity.java

@@ -30,6 +30,7 @@ import io.noties.markwon.sample.inlineparser.InlineParserActivity;
 import io.noties.markwon.sample.latex.LatexActivity;
 import io.noties.markwon.sample.notification.NotificationActivity;
 import io.noties.markwon.sample.precomputed.PrecomputedActivity;
+import io.noties.markwon.sample.precomputed.PrecomputedFutureActivity;
 import io.noties.markwon.sample.recycler.RecyclerActivity;
 import io.noties.markwon.sample.simpleext.SimpleExtActivity;
 import io.noties.markwon.sample.tasklist.TaskListActivity;
@@ -123,6 +124,10 @@ public class MainActivity extends Activity {
                 activity = PrecomputedActivity.class;
                 break;
 
+            case PRECOMPUTED_FUTURE_TEXT:
+                activity = PrecomputedFutureActivity.class;
+                break;
+
             case EDITOR:
                 activity = EditorActivity.class;
                 break;

sample/src/main/java/io/noties/markwon/sample/Sample.java

@@ -23,6 +23,8 @@ public enum Sample {
 
     PRECOMPUTED_TEXT(R.string.sample_precomputed_text),
 
+    PRECOMPUTED_FUTURE_TEXT(R.string.sample_precomputed_future_text),
+
     EDITOR(R.string.sample_editor),
 
     INLINE_PARSER(R.string.sample_inline_parser),

sample/src/main/java/io/noties/markwon/sample/precomputed/PrecomputedFutureActivity.java

@@ -0,0 +1,95 @@
+package io.noties.markwon.sample.precomputed;
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+import io.noties.markwon.Markwon;
+import io.noties.markwon.PrecomputedFutureTextSetterCompat;
+import io.noties.markwon.recycler.MarkwonAdapter;
+import io.noties.markwon.sample.R;
+
+public class PrecomputedFutureActivity extends Activity {
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_recycler);
+
+        final Markwon markwon = Markwon.builder(this)
+                .textSetter(PrecomputedFutureTextSetterCompat.create())
+                .build();
+
+        // create MarkwonAdapter and register two blocks that will be rendered differently
+        final MarkwonAdapter adapter = MarkwonAdapter.builder(R.layout.adapter_appcompat_default_entry, R.id.text)
+                .build();
+
+        final RecyclerView recyclerView = findViewById(R.id.recycler_view);
+        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+        recyclerView.setHasFixedSize(true);
+        recyclerView.setAdapter(adapter);
+
+        adapter.setMarkdown(markwon, loadReadMe(this));
+
+        // please note that we should notify updates (adapter doesn't do it implicitly)
+        adapter.notifyDataSetChanged();
+    }
+
+    @NonNull
+    private static String loadReadMe(@NonNull Context context) {
+        InputStream stream = null;
+        try {
+            stream = context.getAssets().open("README.md");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return readStream(stream);
+    }
+
+    @NonNull
+    private static String readStream(@Nullable InputStream inputStream) {
+
+        String out = null;
+
+        if (inputStream != null) {
+            BufferedReader reader = null;
+            //noinspection TryFinallyCanBeTryWithResources
+            try {
+                reader = new BufferedReader(new InputStreamReader(inputStream));
+                final StringBuilder builder = new StringBuilder();
+                String line;
+                while ((line = reader.readLine()) != null) {
+                    builder.append(line)
+                            .append('\n');
+                }
+                out = builder.toString();
+            } catch (IOException e) {
+                e.printStackTrace();
+            } finally {
+                if (reader != null) {
+                    try {
+                        reader.close();
+                    } catch (IOException e) {
+                        // no op
+                    }
+                }
+            }
+        }
+
+        if (out == null) {
+            throw new RuntimeException("Cannot read stream");
+        }
+
+        return out;
+    }
+}

sample/src/main/res/layout/adapter_appcompat_default_entry.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.appcompat.widget.AppCompatTextView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/text"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginLeft="16dip"
+    android:layout_marginRight="16dip"
+    android:lineSpacingExtra="2dip"
+    android:paddingTop="8dip"
+    android:paddingBottom="8dip"
+    android:textAppearance="?android:attr/textAppearanceMedium"
+    android:textColor="#000"
+    android:textSize="16sp"
+    tools:text="Hello" />

sample/src/main/res/values/strings-samples.xml

@@ -25,6 +25,8 @@
 
     <string name="sample_precomputed_text"># \# PrecomputedText\n\nUsage of TextSetter and PrecomputedTextCompat</string>
 
+    <string name="sample_precomputed_future_text"># \# PrecomputedFutureText\n\nUsage of TextSetter and PrecomputedFutureTextSetterCompat</string>
+
     <string name="sample_editor"># \# Editor\n\n`MarkwonEditor` sample usage to highlight user input in EditText</string>
 
     <string name="sample_inline_parser"># \# Inline Parser\n\nUsage of custom inline parser</string>