diff --git a/README.md b/README.md
index eff82d6..cc4bd7f 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,19 @@
 Interactive Math Pad
 ====================
 
-![preview](https://github.com/raw/jingkecn/myscript-iink-codelabs-android-kotlin/master/docs/images/app/math-pad/preview.gif)
+This is a reproduction of [MyScript MathPad](https://www.myscript.com/retired-apps) on Android platform, based on [MyScript Interactive Ink SDK](https://www.myscript.com/interactive-ink).
 
-> [!INFO]
-> This is a reproduction of the retired MyScript MathPad for Android.
+![preview](docs/images/preview.gif)
+
+> [!ACKNOWLEDGEMENTS]
+>
+> - [1] [MyScript Interactive Ink](https://www.myscript.com/interactive-ink)®
+> - [2] [中國色](http://zhongguose.com/)
 >
 > [!DISCLAIMER]
-> The software is for your study and reference only and the developer will not be responsible for its content.
+> **The software is for your study and reference only and the developer will not be responsible for its content.**
+
+LICENSE
+-------
+
+[MIT License](LICENSE).
diff --git a/app/src/main/java/com/myscript/iink/app/mathpad/MainActivity.kt b/app/src/main/java/com/myscript/iink/app/mathpad/MainActivity.kt
index 6ec7bab..ea74fb3 100644
--- a/app/src/main/java/com/myscript/iink/app/mathpad/MainActivity.kt
+++ b/app/src/main/java/com/myscript/iink/app/mathpad/MainActivity.kt
@@ -6,11 +6,111 @@ package com.myscript.iink.app.mathpad
 
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.widget.Toast
+import com.myscript.iink.*
+import com.myscript.iink.extensions.convert
+import com.myscript.iink.extensions.copyToClipboard
+import com.myscript.iink.uireferenceimplementation.EditorView
+import com.myscript.iink.uireferenceimplementation.FontUtils
+import com.myscript.iink.uireferenceimplementation.InputController
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), IEditorListener {
+
+    private lateinit var contentPart: ContentPart
+    private lateinit var editorView: EditorView
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        (application as? MyApplication)?.contentPackage?.let { initWith(it) }
+        editorView = findViewById<EditorView>(R.id.editor_view).also { initWith(it) }
+    }
+
+    private fun initWith(contentPackage: ContentPackage) = with(contentPackage) {
+        createPart("Math").let { contentPart = it }
+    }
+
+    private fun initWith(view: EditorView) = with(view) {
+        (application as? IInteractiveInkApplication)?.engine?.let {
+            setEngine(it)
+            editor?.addListener(this@MainActivity)
+            inputMode = InputController.INPUT_MODE_FORCE_PEN
+            setTypefaces(FontUtils.loadFontsFromAssets(applicationContext.assets))
+            post {
+                editor?.part = contentPart
+                visibility = View.VISIBLE
+            }
+        }
+    }
+
+    override fun onDestroy() {
+        editorView.close()
+        contentPart.close()
+        super.onDestroy()
     }
+
+    // region Implementations (options menu)
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.activity_main, menu)
+        return super.onCreateOptionsMenu(menu)
+    }
+
+    override fun onPrepareOptionsMenu(menu: Menu?): Boolean {
+        menu?.let {
+            editorView.editor?.run {
+                it.findItem(R.id.menu_clear)?.isEnabled = part?.isClosed == false
+                it.findItem(R.id.menu_redo)?.isEnabled = canRedo()
+                it.findItem(R.id.menu_undo)?.isEnabled = canUndo()
+            }
+        }
+        return super.onPrepareOptionsMenu(menu)
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+        editorView.editor?.let {
+            // wait for the editor to be idle.
+            if (!it.isIdle) it.waitForIdle()
+            when (item?.itemId) {
+                R.id.menu_clear -> it.clear()
+                R.id.menu_convert -> it.convert()
+                R.id.menu_redo -> it.redo()
+                R.id.menu_undo -> it.undo()
+                R.id.menu_export_latex -> it.copyToClipboard(this, MimeType.LATEX)
+                R.id.menu_export_math_ml -> it.copyToClipboard(this, MimeType.MATHML)
+                else -> return@let
+            }
+        }
+        return super.onOptionsItemSelected(item)
+    }
+
+    // endregion
+
+    // region Implementations (IEditorListener)
+
+    override fun contentChanged(editor: Editor?, blockIds: Array<out String>?) {
+        invalidateOptionsMenu()
+    }
+
+    override fun partChanging(editor: Editor?, old: ContentPart?, new: ContentPart?) {
+        invalidateOptionsMenu()
+    }
+
+    override fun partChanged(editor: Editor?) {
+        invalidateOptionsMenu()
+    }
+
+    override fun onError(editor: Editor?, blockId: String?, message: String?) {
+        GlobalScope.launch(Dispatchers.Main) {
+            Toast.makeText(this@MainActivity, message, Toast.LENGTH_LONG).show()
+        }
+    }
+
+    // endregion
 }
diff --git a/app/src/main/java/com/myscript/iink/app/mathpad/MyApplication.kt b/app/src/main/java/com/myscript/iink/app/mathpad/MyApplication.kt
index e37d6ad..6826517 100644
--- a/app/src/main/java/com/myscript/iink/app/mathpad/MyApplication.kt
+++ b/app/src/main/java/com/myscript/iink/app/mathpad/MyApplication.kt
@@ -6,6 +6,7 @@ package com.myscript.iink.app.mathpad
 
 import android.app.Application
 import com.myscript.certificate.MyCertificate
+import com.myscript.iink.ContentPackage
 import com.myscript.iink.Engine
 import java.io.File
 
@@ -15,6 +16,9 @@ class MyApplication : Application(), IInteractiveInkApplication {
     override lateinit var engine: Engine
         private set
 
+    lateinit var contentPackage: ContentPackage
+        private set
+
     override fun onCreate() {
         super.onCreate()
         // Create MyScript interactive ink engine.
@@ -33,11 +37,21 @@ class MyApplication : Application(), IInteractiveInkApplication {
                 it.setString("content-package.temp-folder", "${filesDir.path}${File.separator}tmp")
             }
         }
+        val myPackageFile = File(filesDir, "$IINK_PACKAGE_NAME.iink")
+        try {
+            contentPackage = engine.createPackage(myPackageFile)
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
     }
 
     override fun onTerminate() {
-        // close MyScript iink runtime to release resources.
+        contentPackage.close()
         engine.close()
         super.onTerminate()
     }
+
+    companion object {
+        private const val IINK_PACKAGE_NAME = "my_math_pad_package"
+    }
 }
diff --git a/app/src/main/java/com/myscript/iink/extensions/Editor.kt b/app/src/main/java/com/myscript/iink/extensions/Editor.kt
new file mode 100644
index 0000000..0e37968
--- /dev/null
+++ b/app/src/main/java/com/myscript/iink/extensions/Editor.kt
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) MyScript. All rights reserved.
+ */
+
+package com.myscript.iink.extensions
+
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
+import android.support.annotation.NonNull
+import android.widget.Toast
+import com.myscript.iink.Editor
+import com.myscript.iink.MimeType
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+
+fun Editor.convert() =
+    getSupportedTargetConversionStates(null).firstOrNull()?.let { convert(null, it) }
+
+fun Editor.copyToClipboard(@NonNull context: Context, type: MimeType) =
+    export_(null, type).let {
+        GlobalScope.launch(Dispatchers.Main) {
+            (context.getSystemService(Context.CLIPBOARD_SERVICE) as? ClipboardManager)?.run {
+                primaryClip = ClipData.newPlainText(type.name, it)
+                Toast.makeText(
+                    context,
+                    "String ($type) copied to clipboard:\n$it",
+                    Toast.LENGTH_LONG
+                ).show()
+            }
+        }
+    }
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index c16e569..0cbcded 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -5,57 +5,60 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
-    android:viewportWidth="320"
-    android:viewportHeight="320">
+    android:viewportWidth="1024"
+    android:viewportHeight="1024">
     <path
-        android:fillColor="#009FE3"
-        android:pathData="M271.2,224.8c1.1,1.2 1.7,2.9 1.8,4.4c0,1.5 -0.5,2.9 -1,4c-0.5,1.1 -1.2,1.9 -1.9,2.7c-0.3,0.4 -0.7,0.7 -1.1,1.1c-0.5,0.4 -0.6,0.4 -1.1,0.9c-1.5,1.3 -3.2,2.3 -4.9,3.1c-3.4,1.7 -7.2,2.7 -11.2,2.5c-2,-0.2 -4,-0.6 -5.8,-1.7c-0.9,-0.5 -1.7,-1.2 -2.4,-1.9c-0.1,-0.1 -0.2,-0.2 -0.3,-0.3c-0.9,0.7 -1.7,1.2 -2.4,1.7c-0.6,0.4 -1.2,0.7 -1.7,0.9c-0.5,0.2 -1.1,0.3 -1.6,0.4c-0.6,0 -1,0 -1.3,0c-0.3,-0.1 -0.5,-0.1 -0.5,-0.1h-0.1c-1.3,-0.2 -2.2,-1.2 -2.5,-2.4c0,0 -0.1,-0.1 -0.1,-0.5c-0.1,-0.3 -0.1,-0.8 0,-1.3c0,-0.5 0.2,-1.1 0.5,-1.7c0.3,-0.5 0.8,-1.2 1.2,-1.8c0.4,-0.6 1.1,-1.4 1.8,-2c0.8,-0.6 1.6,-1.3 2.5,-1.9c0.3,-0.1 0.5,-0.3 0.8,-0.5c0,-1.1 0.1,-2.2 0.5,-3.2c1.1,-3.3 3.1,-5.7 5.2,-7.5c2.1,-1.7 4.3,-3 6.3,-3.8c2,-0.8 3.8,-1.3 5.3,-1.7c1.5,-0.3 2.7,-0.5 3.5,-0.6c0.8,0 1.3,-0.1 1.3,-0.1c0.3,0 0.6,0.2 0.6,0.5c0,0.3 -0.2,0.5 -0.5,0.6c0,0 -0.4,0.1 -1.2,0.3c-0.8,0.2 -1.9,0.4 -3.3,0.9c-1.4,0.5 -3.1,1.1 -4.9,2c-1.9,0.9 -3.8,2.1 -5.5,3.9c-1.7,1.8 -3.3,3.9 -3.8,6.4c0.6,-0.4 1.3,-0.7 1.9,-1.1c2.5,-1.3 5.2,-2.6 8.3,-3.7c1.6,-0.6 3.3,-1 4.9,-1.4c1.9,-0.4 3.9,-0.6 6,-0.3c1,0.1 2.1,0.3 3.3,0.8c1.2,0.5 2.4,1.2 3.4,2.4zM266,230.3c0.2,-0.3 0.1,-0.8 0.1,-1c-0.1,-0.1 -0.3,-0.3 -0.7,-0.4c-0.5,-0.1 -1,-0.2 -1.5,-0.2c-1.1,0 -2.3,0.1 -3.5,0.5c-0.4,0.1 -0.7,0.3 -1.1,0.4c-0.9,0.4 -1.8,0.6 -2.7,1.1c-2.4,1.1 -4.6,2.3 -6.6,3.6c-1.3,0.8 -2.6,1.7 -3.7,2.6c0.4,0.4 1,0.7 1.5,1c1.2,0.5 2.5,0.7 3.9,0.7c2.9,-0.1 5.9,-1.2 8.5,-2.7c1.2,-0.7 2.5,-1.6 3.5,-2.6c0.2,-0.2 0.6,-0.6 0.8,-0.8c0.1,-0.2 0.4,-0.4 0.6,-0.7c0.4,-0.5 0.7,-1 0.9,-1.5zM266,230.3c-0.2,0.5 0.2,-0.3 0,0z" />
+        android:fillColor="#000000"
+        android:pathData="M280.62,309.23L280.62,293.77L541.24,293.77L570.54,394.31L552.02,394.31L532.57,335.72Q528.59,323.53 519.68,318.61Q511.01,313.45 484.52,313.45L367.1,313.45L507.49,496.97L507.49,506.58L352.34,665.95L539.37,665.95Q549.45,665.95 552.96,662.91Q556.71,659.86 558.82,650.95L574.05,597.28L592.57,597.28L555.77,731.11L279.68,731.11L279.68,714.47L453.12,537.28L280.62,309.23Z" />
+    <path
+        android:fillColor="#009fe3"
+        android:pathData="M745,579.2c0,1.5 -0.5,2.9 -1,4c-0.5,1.1 -1.2,1.9 -1.9,2.7c-0.3,0.4 -0.7,0.7 -1.1,1.1c-0.5,0.4 -0.6,0.4 -1.1,0.9c-1.5,1.3 -3.2,2.3 -4.9,3.1c-3.4,1.7 -7.2,2.7 -11.2,2.5c-2,-0.2 -4,-0.6 -5.8,-1.7c-0.9,-0.5 -1.7,-1.2 -2.4,-1.9c-0.1,-0.1 -0.2,-0.2 -0.3,-0.3c-0.9,0.7 -1.7,1.2 -2.4,1.7c-0.6,0.4 -1.2,0.7 -1.7,0.9c-0.5,0.2 -1.1,0.3 -1.6,0.4c-0.6,0 -1,0 -1.3,0c-0.3,-0.1 -0.5,-0.1 -0.5,-0.1h-0.1c-1.3,-0.2 -2.2,-1.2 -2.5,-2.4c0,0 -0.1,-0.1 -0.1,-0.5c-0.1,-0.3 -0.1,-0.8 0,-1.3c0,-0.5 0.2,-1.1 0.5,-1.7c0.3,-0.5 0.8,-1.2 1.2,-1.8c0.4,-0.6 1.1,-1.4 1.8,-2c0.8,-0.6 1.6,-1.3 2.5,-1.9c0.3,-0.1 0.5,-0.3 0.8,-0.5c0,-1.1 0.1,-2.2 0.5,-3.2c1.1,-3.3 3.1,-5.7 5.2,-7.5c2.1,-1.7 4.3,-3 6.3,-3.8c2,-0.8 3.8,-1.3 5.3,-1.7c1.5,-0.3 2.7,-0.5 3.5,-0.6c0.8,0 1.3,-0.1 1.3,-0.1c0.3,0 0.6,0.2 0.6,0.5c0,0.3 -0.2,0.5 -0.5,0.6c0,0 -0.4,0.1 -1.2,0.3c-0.8,0.2 -1.9,0.4 -3.3,0.9c-1.4,0.5 -3.1,1.1 -4.9,2c-1.9,0.9 -3.8,2.1 -5.5,3.9c-1.7,1.8 -3.3,3.9 -3.8,6.4c0.6,-0.4 1.3,-0.7 1.9,-1.1c2.5,-1.3 5.2,-2.6 8.3,-3.7c1.6,-0.6 3.3,-1 4.9,-1.4c1.9,-0.4 3.9,-0.6 6,-0.3c1,0.1 2.1,0.3 3.3,0.8c1.2,0.5 2.4,1.2 3.4,2.4c1.1,1.2 1.7,2.9 1.8,4.4zM738.1,579.3c-0.1,-0.1 -0.3,-0.3 -0.7,-0.4c-0.5,-0.1 -1,-0.2 -1.5,-0.2c-1.1,0 -2.3,0.1 -3.5,0.5c-0.4,0.1 -0.7,0.3 -1.1,0.4c-0.9,0.4 -1.8,0.6 -2.7,1.1c-2.4,1.1 -4.6,2.3 -6.6,3.6c-1.3,0.8 -2.6,1.7 -3.7,2.6c0.4,0.4 1,0.7 1.5,1c1.2,0.5 2.5,0.7 3.9,0.7c2.9,-0.1 5.9,-1.2 8.5,-2.7c1.2,-0.7 2.5,-1.6 3.5,-2.6c0.2,-0.2 0.6,-0.6 0.8,-0.8c0.1,-0.2 0.4,-0.4 0.6,-0.7c0.4,-0.5 0.7,-1 0.9,-1.5c0.2,-0.3 0.1,-0.8 0.1,-1z" />
     <path
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+        android:pathData="M590.1,465.2c0,-5.2 -4.2,-9.4 -9.4,-9.4c-5.2,0 -9.4,4.2 -9.4,9.4c0,5.2 4.2,9.4 9.4,9.4c5.2,0 9.4,-4.2 9.4,-9.4z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M93,115.2c0,-5.2 -4.2,-9.4 -9.4,-9.4c-5.2,0 -9.4,4.2 -9.4,9.4c0,5.2 4.2,9.4 9.4,9.4c5.2,0 9.4,-4.2 9.4,-9.4z" />
+        android:pathData="M565,465.2c0,-5.2 -4.2,-9.4 -9.4,-9.4c-5.2,0 -9.4,4.2 -9.4,9.4c0,5.2 4.2,9.4 9.4,9.4c5.2,0 9.4,-4.2 9.4,-9.4z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M90.3,93.4h3l-1.2,-15.4h-3.7l-3.9,11.7l-3.9,-11.7h-3.8l-1.2,15.4h2.7l0.8,-11.3l3.9,11.3h2.6l3.9,-11.3l0.8,11.3z" />
+        android:pathData="M562.3,443.4h3l-1.2,-15.4h-3.7l-3.9,11.7l-3.9,-11.7h-3.8l-1.2,15.4h2.7l0.8,-11.3l3.9,11.3h2.6l3.9,-11.3l0.8,11.3z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M104.4,82.6h-2.7l-2.4,7.5l-2.5,-7.7l-2.8,0.4l3.8,10.8l-0.2,0.7c-0.3,0.7 -0.9,1.1 -1.7,1.1c-0.6,0 -0.9,-0.1 -1.3,-0.2l0.4,2.2c0.3,0.1 0.5,0.1 1,0.1c2.1,0 3.3,-0.8 4.3,-3.5z" />
+        android:pathData="M576.4,432.6h-2.7l-2.4,7.5l-2.5,-7.7l-2.8,0.4l3.8,10.8l-0.2,0.7c-0.3,0.7 -0.9,1.1 -1.7,1.1c-0.6,0 -0.9,-0.1 -1.3,-0.2l0.4,2.2c0.3,0.1 0.5,0.1 1,0.1c2.1,0 3.3,-0.8 4.3,-3.5z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M115.2,89c0,-2.4 -1.1,-3.5 -4.3,-4.8c-2.1,-0.8 -2.6,-1.3 -2.6,-2.3c0,-1 0.6,-1.7 2.1,-1.7c1.2,0 2.5,0.5 3.6,1.2l0.4,-2.7c-1.1,-0.5 -2.4,-0.9 -4.1,-0.9c-2.9,0 -5,1.6 -5,4.3c0,2.4 1.2,3.4 4.2,4.6c2.3,1 2.8,1.5 2.8,2.6c0,1.3 -0.9,1.9 -2.3,1.9c-1.6,0 -3.2,-0.6 -4.5,-1.4l-0.4,2.7c1.4,0.7 3,1.1 4.9,1.1c3,0 5.2,-1.6 5.2,-4.6z" />
+        android:pathData="M587.2,439c0,-2.4 -1.1,-3.5 -4.3,-4.8c-2.1,-0.8 -2.6,-1.3 -2.6,-2.3c0,-1 0.6,-1.7 2.1,-1.7c1.2,0 2.5,0.5 3.6,1.2l0.4,-2.7c-1.1,-0.5 -2.4,-0.9 -4.1,-0.9c-2.9,0 -5,1.6 -5,4.3c0,2.4 1.2,3.4 4.2,4.6c2.3,1 2.8,1.5 2.8,2.6c0,1.3 -0.9,1.9 -2.3,1.9c-1.6,0 -3.2,-0.6 -4.5,-1.4l-0.4,2.7c1.4,0.7 3,1.1 4.9,1.1c3,0 5.2,-1.6 5.2,-4.6z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M125.1,92.6l-0.4,-2.3c-1,0.8 -1.9,1 -2.8,1c-1.6,0 -2.8,-1.1 -2.8,-3.3c0,-2.2 1.2,-3.3 2.7,-3.3c1,0 1.9,0.3 2.8,1l0.4,-2.4c-0.9,-0.5 -1.9,-0.9 -3.4,-0.9c-2.9,0 -5.2,1.9 -5.2,5.7c0,3.5 2.1,5.5 5.1,5.5c1.3,0 2.4,-0.3 3.6,-1z" />
+        android:pathData="M597.1,442.6l-0.4,-2.3c-1,0.8 -1.9,1 -2.8,1c-1.6,0 -2.8,-1.1 -2.8,-3.3c0,-2.2 1.2,-3.3 2.7,-3.3c1,0 1.9,0.3 2.8,1l0.4,-2.4c-0.9,-0.5 -1.9,-0.9 -3.4,-0.9c-2.9,0 -5.2,1.9 -5.2,5.7c0,3.5 2.1,5.5 5.1,5.5c1.3,0 2.4,-0.3 3.6,-1z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M133,85.1l-0.4,-2.7c-1.7,0.1 -2.8,1.1 -3.5,2.4l-0.3,-2.2h-2.3v10.8h2.7v-6.2c0.8,-1.2 2.2,-2.1 3.8,-2.1z" />
+        android:pathData="M605,435.1l-0.4,-2.7c-1.7,0.1 -2.8,1.1 -3.5,2.4l-0.3,-2.2h-2.3v10.8h2.7v-6.2c0.8,-1.2 2.2,-2.1 3.8,-2.1z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M137.1,79.3c0,-1 -0.7,-1.6 -1.6,-1.6c-0.9,0 -1.6,0.7 -1.6,1.6c0,0.9 0.7,1.5 1.6,1.5c0.9,0 1.6,-0.7 1.6,-1.5zM134.1,93.4h2.7v-10.8h-2.7v10.8z" />
+        android:pathData="M609.1,429.3c0,-1 -0.7,-1.6 -1.6,-1.6c-0.9,0 -1.6,0.7 -1.6,1.6c0,0.9 0.7,1.5 1.6,1.5c0.9,0 1.6,-0.7 1.6,-1.5zM606.1,443.4h2.7v-10.8h-2.7z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M144.1,93.5c-1,0 -1.9,-0.2 -2.5,-0.4v4.1l-2.7,0.4v-15h2.3l0.2,1.5c0.8,-0.9 1.8,-1.7 3.3,-1.7c2.3,0 4.1,1.7 4.1,5.3c0,4 -2.2,5.8 -4.7,5.8zM144,84.7c-1,0 -1.7,0.6 -2.4,1.5v4.6c0.6,0.3 1.2,0.5 2.1,0.5c1.4,0 2.4,-1.1 2.4,-3.5c0,-2 -0.9,-3.1 -2.1,-3.1z" />
+        android:pathData="M613.6,443.1v4.1l-2.7,0.4v-15h2.3l0.2,1.5c0.8,-0.9 1.8,-1.7 3.3,-1.7c2.3,0 4.1,1.7 4.1,5.3c0,4 -2.2,5.8 -4.7,5.8c-1,0 -1.9,-0.2 -2.5,-0.4zM616,434.7c-1,0 -1.7,0.6 -2.4,1.5v4.6c0.6,0.3 1.2,0.5 2.1,0.5c1.4,0 2.4,-1.1 2.4,-3.5c0,-2 -0.9,-3.1 -2.1,-3.1z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M156,93.5l-0.3,-2.3c-0.2,0.1 -0.5,0.1 -0.8,0.1c-1,0 -1.4,-0.4 -1.4,-1.3v-5.1h2.5l-0.3,-2.2h-2.2v-3.8l-2.6,0.4v3.4h-1.5v2.2h1.5v5.5c0,2.4 1.5,3.2 3.6,3.2c0.8,0 1.3,-0.1 1.5,-0.1z" />
+        android:pathData="M628,443.5l-0.3,-2.3c-0.2,0.1 -0.5,0.1 -0.8,0.1c-1,0 -1.4,-0.4 -1.4,-1.3v-5.1h2.5l-0.3,-2.2h-2.2v-3.8l-2.6,0.4v3.4h-1.5v2.2h1.5v5.5c0,2.4 1.5,3.2 3.6,3.2c0.8,0 1.3,-0.1 1.5,-0.1z" />
     <path
         android:fillColor="#000000"
-        android:pathData="M231.9,198.9c-3,0 -5.1,-2.1 -5.1,-5.2c0,-3.1 2.1,-5.2 5.1,-5.2c3,0 5.1,2.1 5.1,5.2c0,3.1 -2.1,5.2 -5.1,5.2zM231.9,189.1c-2.4,0 -4.3,1.7 -4.3,4.6c0,2.9 1.9,4.6 4.3,4.6c2.4,0 4.4,-1.7 4.4,-4.6c0,-2.9 -1.9,-4.6 -4.4,-4.6zM233.2,196.5l-1.5,-2.3h-0.4v2.2h-1.3v-5.7h2c1.3,0 2.1,0.6 2.1,1.7c0,0.8 -0.4,1.3 -1.1,1.6l1.5,2.3zM231.9,191.7h-0.6v1.6h0.6c0.6,0 1,-0.3 1,-0.8c-0.1,-0.5 -0.4,-0.8 -1,-0.8z" />
+        android:pathData="M703.9,548.9c-3,0 -5.1,-2.1 -5.1,-5.2c0,-3.1 2.1,-5.2 5.1,-5.2c3,0 5.1,2.1 5.1,5.2c0,3.1 -2.1,5.2 -5.1,5.2zM703.9,539.1c-2.4,0 -4.3,1.7 -4.3,4.6c0,2.9 1.9,4.6 4.3,4.6c2.4,0 4.4,-1.7 4.4,-4.6c0,-2.9 -1.9,-4.6 -4.4,-4.6zM705.2,546.5l-1.5,-2.3h-0.4v2.2h-1.3v-5.7h2c1.3,0 2.1,0.6 2.1,1.7c0,0.8 -0.4,1.3 -1.1,1.6l1.5,2.3zM703.3,541.7v1.6h0.6c0.6,0 1,-0.3 1,-0.8c-0.1,-0.5 -0.4,-0.8 -1,-0.8z" />
 </vector>
diff --git a/app/src/main/res/drawable/ic_clear.xml b/app/src/main/res/drawable/ic_clear.xml
new file mode 100644
index 0000000..0743d47
--- /dev/null
+++ b/app/src/main/res/drawable/ic_clear.xml
@@ -0,0 +1,14 @@
+<!--
+  ~ Copyright (c) MyScript. All rights reserved.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?android:attr/colorControlNormal"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_convert.xml b/app/src/main/res/drawable/ic_convert.xml
new file mode 100644
index 0000000..04d4b2f
--- /dev/null
+++ b/app/src/main/res/drawable/ic_convert.xml
@@ -0,0 +1,14 @@
+<!--
+  ~ Copyright (c) MyScript. All rights reserved.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?android:attr/colorControlNormal"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M19,8l-4,4h3c0,3.31 -2.69,6 -6,6 -1.01,0 -1.97,-0.25 -2.8,-0.7l-1.46,1.46C8.97,19.54 10.43,20 12,20c4.42,0 8,-3.58 8,-8h3l-4,-4zM6,12c0,-3.31 2.69,-6 6,-6 1.01,0 1.97,0.25 2.8,0.7l1.46,-1.46C15.03,4.46 13.57,4 12,4c-4.42,0 -8,3.58 -8,8H1l4,4 4,-4H6z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_export.xml b/app/src/main/res/drawable/ic_export.xml
new file mode 100644
index 0000000..71a1819
--- /dev/null
+++ b/app/src/main/res/drawable/ic_export.xml
@@ -0,0 +1,14 @@
+<!--
+  ~ Copyright (c) MyScript. All rights reserved.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?android:attr/colorControlNormal"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M19,9h-4V3H9v6H5l7,7 7,-7zM5,18v2h14v-2H5z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 85efc6f..06ac429 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -5,9 +5,10 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
+    android:tint="@color/colorPrimary"
     android:viewportWidth="108"
     android:viewportHeight="108">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="#FF000000"
         android:pathData="M0,0h108v108h-108z" />
 </vector>
diff --git a/app/src/main/res/drawable/ic_logo_iink.xml b/app/src/main/res/drawable/ic_logo_iink.xml
new file mode 100644
index 0000000..82f76a2
--- /dev/null
+++ b/app/src/main/res/drawable/ic_logo_iink.xml
@@ -0,0 +1,61 @@
+<!--
+  ~ Copyright (c) MyScript. All rights reserved.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="320"
+    android:viewportHeight="320">
+    <path
+        android:fillColor="#009fe3"
+        android:pathData="M271.2,224.8c1.1,1.2 1.7,2.9 1.8,4.4c0,1.5 -0.5,2.9 -1,4c-0.5,1.1 -1.2,1.9 -1.9,2.7c-0.3,0.4 -0.7,0.7 -1.1,1.1c-0.5,0.4 -0.6,0.4 -1.1,0.9c-1.5,1.3 -3.2,2.3 -4.9,3.1c-3.4,1.7 -7.2,2.7 -11.2,2.5c-2,-0.2 -4,-0.6 -5.8,-1.7c-0.9,-0.5 -1.7,-1.2 -2.4,-1.9c-0.1,-0.1 -0.2,-0.2 -0.3,-0.3c-0.9,0.7 -1.7,1.2 -2.4,1.7c-0.6,0.4 -1.2,0.7 -1.7,0.9c-0.5,0.2 -1.1,0.3 -1.6,0.4c-0.6,0 -1,0 -1.3,0c-0.3,-0.1 -0.5,-0.1 -0.5,-0.1h-0.1c-1.3,-0.2 -2.2,-1.2 -2.5,-2.4c0,0 -0.1,-0.1 -0.1,-0.5c-0.1,-0.3 -0.1,-0.8 0,-1.3c0,-0.5 0.2,-1.1 0.5,-1.7c0.3,-0.5 0.8,-1.2 1.2,-1.8c0.4,-0.6 1.1,-1.4 1.8,-2c0.8,-0.6 1.6,-1.3 2.5,-1.9c0.3,-0.1 0.5,-0.3 0.8,-0.5c0,-1.1 0.1,-2.2 0.5,-3.2c1.1,-3.3 3.1,-5.7 5.2,-7.5c2.1,-1.7 4.3,-3 6.3,-3.8c2,-0.8 3.8,-1.3 5.3,-1.7c1.5,-0.3 2.7,-0.5 3.5,-0.6c0.8,0 1.3,-0.1 1.3,-0.1c0.3,0 0.6,0.2 0.6,0.5c0,0.3 -0.2,0.5 -0.5,0.6c0,0 -0.4,0.1 -1.2,0.3c-0.8,0.2 -1.9,0.4 -3.3,0.9c-1.4,0.5 -3.1,1.1 -4.9,2c-1.9,0.9 -3.8,2.1 -5.5,3.9c-1.7,1.8 -3.3,3.9 -3.8,6.4c0.6,-0.4 1.3,-0.7 1.9,-1.1c2.5,-1.3 5.2,-2.6 8.3,-3.7c1.6,-0.6 3.3,-1 4.9,-1.4c1.9,-0.4 3.9,-0.6 6,-0.3c1,0.1 2.1,0.3 3.3,0.8c1.2,0.5 2.4,1.2 3.4,2.4zM266,230.3c0.2,-0.3 0.1,-0.8 0.1,-1c-0.1,-0.1 -0.3,-0.3 -0.7,-0.4c-0.5,-0.1 -1,-0.2 -1.5,-0.2c-1.1,0 -2.3,0.1 -3.5,0.5c-0.4,0.1 -0.7,0.3 -1.1,0.4c-0.9,0.4 -1.8,0.6 -2.7,1.1c-2.4,1.1 -4.6,2.3 -6.6,3.6c-1.3,0.8 -2.6,1.7 -3.7,2.6c0.4,0.4 1,0.7 1.5,1c1.2,0.5 2.5,0.7 3.9,0.7c2.9,-0.1 5.9,-1.2 8.5,-2.7c1.2,-0.7 2.5,-1.6 3.5,-2.6c0.2,-0.2 0.6,-0.6 0.8,-0.8c0.1,-0.2 0.4,-0.4 0.6,-0.7c0.4,-0.5 0.7,-1 0.9,-1.5zM266,230.3c-0.2,0.5 0.2,-0.3 0,0z" />
+    <path
+        android:fillColor="#009fe3"
+        android:pathData="M253.4,201.5c0.4,-0.3 0.4,-0.8 0.6,-1.3c2.1,-6.7 3.3,-13.7 4.5,-20.5c1.3,-7.7 2.2,-15.5 3,-23.2c1.6,-15.6 2.5,-31.4 3,-47.1c0.2,-3.5 0.7,-7.1 -0.5,-10.6c-1,-2.9 -4.4,-4.8 -7.5,-4.6c-3.1,0.2 -5.8,2.6 -6.5,5.5c-0.8,3.4 0,7.1 0.3,10.6c1.3,15.5 2.3,31.2 2.8,46.8c0.3,7.9 0.4,15.7 0.3,23.5c-0.1,6.7 -0.4,13.4 -1.3,20c-0.1,0.7 0.7,1.3 1.3,0.9z" />
+    <path
+        android:fillColor="#009fe3"
+        android:pathData="M50.8,246c1.6,1 4.1,1.2 6.7,0.9c2.7,-0.2 5.5,-0.9 8.2,-1.5c5.6,-1.3 11.4,-2.7 17.2,-3.8c11.9,-2.2 23.8,-4.2 35.8,-5.7c12.3,-1.4 24.7,-2.4 37.1,-2.9c12.1,-0.5 24.2,-0.6 36.3,-0.4c5.6,0 11.2,0.2 16.7,0.5c2.1,0.1 4.3,0.2 6.5,0.3c0.4,0 0.7,0 1,0c0.8,-0.1 0.9,-1.1 0.1,-1.4c-1.2,-0.4 -2.5,-0.3 -3.7,-0.5c-2.7,-0.4 -5.4,-0.7 -8.1,-1c-5.7,-0.6 -11.4,-1.2 -17.1,-1.7c-12,-1.1 -24.1,-1.7 -36.1,-1.9c-12.5,-0.2 -24.8,0.2 -37.3,0.9c-12,0.7 -24.1,1.9 -36,3.8c-5.6,0.8 -11.4,1.7 -17.1,2.8c-4.6,0.9 -9,1.5 -11.5,5.9c-1,2 -0.5,4.7 1.3,5.7z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M221.5,196.7l-24.7,-33.6l23.3,-28.3h-17.6l-20.7,26.2v-57.5l-15.7,2.5v92.1h15.7v-31.3l23.2,32.2z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M140.2,198.1h15.9v-45.6c0,-11.8 -6.3,-19 -18.1,-19c-8.5,0 -15.2,4.6 -21.1,10.2l-1.5,-8.9h-13.4v63.3h15.7v-42.7c4.6,-4.8 9.4,-8 14.4,-8c5.7,0 8.1,3.8 8.1,9.3v41.4z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M75.8,198.1h15.6v-63.3h-15.6v63.3z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M118.1,115.2c0,-5.2 -4.2,-9.4 -9.4,-9.4c-5.2,0 -9.4,4.2 -9.4,9.4c0,5.2 4.2,9.4 9.4,9.4c5.2,0 9.4,-4.2 9.4,-9.4z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M93,115.2c0,-5.2 -4.2,-9.4 -9.4,-9.4c-5.2,0 -9.4,4.2 -9.4,9.4c0,5.2 4.2,9.4 9.4,9.4c5.2,0 9.4,-4.2 9.4,-9.4z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M90.3,93.4h3l-1.2,-15.4h-3.7l-3.9,11.7l-3.9,-11.7h-3.8l-1.2,15.4h2.7l0.8,-11.3l3.9,11.3h2.6l3.9,-11.3l0.8,11.3z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M104.4,82.6h-2.7l-2.4,7.5l-2.5,-7.7l-2.8,0.4l3.8,10.8l-0.2,0.7c-0.3,0.7 -0.9,1.1 -1.7,1.1c-0.6,0 -0.9,-0.1 -1.3,-0.2l0.4,2.2c0.3,0.1 0.5,0.1 1,0.1c2.1,0 3.3,-0.8 4.3,-3.5z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M115.2,89c0,-2.4 -1.1,-3.5 -4.3,-4.8c-2.1,-0.8 -2.6,-1.3 -2.6,-2.3c0,-1 0.6,-1.7 2.1,-1.7c1.2,0 2.5,0.5 3.6,1.2l0.4,-2.7c-1.1,-0.5 -2.4,-0.9 -4.1,-0.9c-2.9,0 -5,1.6 -5,4.3c0,2.4 1.2,3.4 4.2,4.6c2.3,1 2.8,1.5 2.8,2.6c0,1.3 -0.9,1.9 -2.3,1.9c-1.6,0 -3.2,-0.6 -4.5,-1.4l-0.4,2.7c1.4,0.7 3,1.1 4.9,1.1c3,0 5.2,-1.6 5.2,-4.6z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M125.1,92.6l-0.4,-2.3c-1,0.8 -1.9,1 -2.8,1c-1.6,0 -2.8,-1.1 -2.8,-3.3c0,-2.2 1.2,-3.3 2.7,-3.3c1,0 1.9,0.3 2.8,1l0.4,-2.4c-0.9,-0.5 -1.9,-0.9 -3.4,-0.9c-2.9,0 -5.2,1.9 -5.2,5.7c0,3.5 2.1,5.5 5.1,5.5c1.3,0 2.4,-0.3 3.6,-1z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M133,85.1l-0.4,-2.7c-1.7,0.1 -2.8,1.1 -3.5,2.4l-0.3,-2.2h-2.3v10.8h2.7v-6.2c0.8,-1.2 2.2,-2.1 3.8,-2.1z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M137.1,79.3c0,-1 -0.7,-1.6 -1.6,-1.6c-0.9,0 -1.6,0.7 -1.6,1.6c0,0.9 0.7,1.5 1.6,1.5c0.9,0 1.6,-0.7 1.6,-1.5zM134.1,93.4h2.7v-10.8h-2.7v10.8z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M144.1,93.5c-1,0 -1.9,-0.2 -2.5,-0.4v4.1l-2.7,0.4v-15h2.3l0.2,1.5c0.8,-0.9 1.8,-1.7 3.3,-1.7c2.3,0 4.1,1.7 4.1,5.3c0,4 -2.2,5.8 -4.7,5.8zM144,84.7c-1,0 -1.7,0.6 -2.4,1.5v4.6c0.6,0.3 1.2,0.5 2.1,0.5c1.4,0 2.4,-1.1 2.4,-3.5c0,-2 -0.9,-3.1 -2.1,-3.1z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M156,93.5l-0.3,-2.3c-0.2,0.1 -0.5,0.1 -0.8,0.1c-1,0 -1.4,-0.4 -1.4,-1.3v-5.1h2.5l-0.3,-2.2h-2.2v-3.8l-2.6,0.4v3.4h-1.5v2.2h1.5v5.5c0,2.4 1.5,3.2 3.6,3.2c0.8,0 1.3,-0.1 1.5,-0.1z" />
+    <path
+        android:fillColor="#000000"
+        android:pathData="M231.9,198.9c-3,0 -5.1,-2.1 -5.1,-5.2c0,-3.1 2.1,-5.2 5.1,-5.2c3,0 5.1,2.1 5.1,5.2c0,3.1 -2.1,5.2 -5.1,5.2zM231.9,189.1c-2.4,0 -4.3,1.7 -4.3,4.6c0,2.9 1.9,4.6 4.3,4.6c2.4,0 4.4,-1.7 4.4,-4.6c0,-2.9 -1.9,-4.6 -4.4,-4.6zM233.2,196.5l-1.5,-2.3h-0.4v2.2h-1.3v-5.7h2c1.3,0 2.1,0.6 2.1,1.7c0,0.8 -0.4,1.3 -1.1,1.6l1.5,2.3zM231.9,191.7h-0.6v1.6h0.6c0.6,0 1,-0.3 1,-0.8c-0.1,-0.5 -0.4,-0.8 -1,-0.8z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_redo.xml b/app/src/main/res/drawable/ic_redo.xml
new file mode 100644
index 0000000..223f00e
--- /dev/null
+++ b/app/src/main/res/drawable/ic_redo.xml
@@ -0,0 +1,14 @@
+<!--
+  ~ Copyright (c) MyScript. All rights reserved.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?android:attr/colorControlNormal"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M18.4,10.6C16.55,8.99 14.15,8 11.5,8c-4.65,0 -8.58,3.03 -9.96,7.22L3.9,16c1.05,-3.19 4.05,-5.5 7.6,-5.5 1.95,0 3.73,0.72 5.12,1.88L13,16h9V7l-3.6,3.6z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_undo.xml b/app/src/main/res/drawable/ic_undo.xml
new file mode 100644
index 0000000..6ff0e7a
--- /dev/null
+++ b/app/src/main/res/drawable/ic_undo.xml
@@ -0,0 +1,14 @@
+<!--
+  ~ Copyright (c) MyScript. All rights reserved.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?android:attr/colorControlNormal"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12.5,8c-2.65,0 -5.05,0.99 -6.9,2.6L2,7v9h9l-3.62,-3.62c1.39,-1.16 3.16,-1.88 5.12,-1.88 3.54,0 6.55,2.31 7.6,5.5l2.37,-0.78C21.08,11.03 17.15,8 12.5,8z" />
+</vector>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 1c69e25..dacfd38 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -5,6 +5,7 @@
   -->
 
 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -12,4 +13,15 @@
 
     <include layout="@layout/editor_view" />
 
+    <TextView
+        style="?android:attr/tooltipText"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:background="@color/chShiruihong"
+        android:drawableEnd="@drawable/ic_logo_iink"
+        android:text="@string/footnote"
+        android:textColor="@color/colorPrimaryDark"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
+
 </android.support.constraint.ConstraintLayout>
diff --git a/app/src/main/res/menu/activity_main.xml b/app/src/main/res/menu/activity_main.xml
new file mode 100644
index 0000000..4dcd6e5
--- /dev/null
+++ b/app/src/main/res/menu/activity_main.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (c) MyScript. All rights reserved.
+  -->
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/menu_undo"
+        android:icon="@drawable/ic_undo"
+        android:title="@string/menu_undo"
+        app:showAsAction="ifRoom" />
+    <item
+        android:id="@+id/menu_redo"
+        android:icon="@drawable/ic_redo"
+        android:title="@string/menu_redo"
+        app:showAsAction="ifRoom" />
+    <item
+        android:id="@+id/menu_clear"
+        android:icon="@drawable/ic_clear"
+        android:title="@string/menu_clear"
+        app:showAsAction="ifRoom" />
+    <item
+        android:id="@+id/menu_convert"
+        android:icon="@drawable/ic_convert"
+        android:title="@string/menu_convert"
+        app:showAsAction="ifRoom" />
+    <item
+        android:id="@+id/menu_export"
+        android:icon="@drawable/ic_export"
+        android:title="@string/menu_export"
+        app:showAsAction="ifRoom">
+        <menu>
+            <item
+                android:id="@+id/menu_export_latex"
+                android:icon="@drawable/ic_export"
+                android:title="@string/menu_export_latex"
+                app:showAsAction="ifRoom" />
+            <item
+                android:id="@+id/menu_export_math_ml"
+                android:icon="@drawable/ic_export"
+                android:title="@string/menu_export_math_ml"
+                app:showAsAction="ifRoom" />
+        </menu>
+    </item>
+</menu>
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index 6824835..96525d0 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -5,6 +5,6 @@
   -->
 
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-  <background android:drawable="@drawable/ic_launcher_background" />
-  <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index 6824835..96525d0 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -5,6 +5,6 @@
   -->
 
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-  <background android:drawable="@drawable/ic_launcher_background" />
-  <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
index a98a138..328b0d3 100644
Binary files a/app/src/main/res/mipmap-hdpi/ic_launcher.png and b/app/src/main/res/mipmap-hdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
index 34ca9b3..bc46265 100644
Binary files a/app/src/main/res/mipmap-mdpi/ic_launcher.png and b/app/src/main/res/mipmap-mdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
index 4b3eb36..50452bb 100644
Binary files a/app/src/main/res/mipmap-xhdpi/ic_launcher.png and b/app/src/main/res/mipmap-xhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
index bbea1d0..3d56b84 100644
Binary files a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png and b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
index 36639e3..407f699 100644
Binary files a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png and b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index dcfa90c..76b86ec 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -5,7 +5,12 @@
   -->
 
 <resources>
-    <color name="colorPrimary">#009FE3</color>
-    <color name="colorPrimaryDark">#008DC9</color>
+    <color name="colorPrimary">@color/chMudanfenhong</color>
+    <color name="colorPrimaryDark">@color/chManjianghong</color>
     <color name="colorAccent">@android:color/white</color>
+
+    <!-- 中國色（http://zhongguose.com） -->
+    <color name="chManjianghong">#a7535a</color>
+    <color name="chMudanfenhong">#eea2a4</color>
+    <color name="chShiruihong">#f0c9cf</color>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 9716dfd..68ae282 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -3,5 +3,15 @@
   -->
 
 <resources>
-  <string name="app_name">Interactive Math Pad</string>
+    <string name="app_name">Interactive Math Pad</string>
+
+    <string name="menu_undo">Undo</string>
+    <string name="menu_redo">Redo</string>
+    <string name="menu_clear">Clear</string>
+    <string name="menu_convert">Convert</string>
+    <string name="menu_export">Export As</string>
+    <string name="menu_export_latex">LaTeX</string>
+    <string name="menu_export_math_ml">Math ML</string>
+
+    <string name="footnote">All rights reserved. Powered by</string>
 </resources>
diff --git a/build.gradle b/build.gradle
index c8fe179..71b3ad5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,52 +5,52 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-  ext {
-    android_plugin_version = '3.3.2'
-    kotlin_version = '1.3.21'
-    kotlinx_coroutines_version = '1.1.1'
-  }
-  repositories {
-    google()
-    jcenter()
-  }
-  dependencies {
-    classpath "com.android.tools.build:gradle:$android_plugin_version"
-    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-
-    // NOTE: Do not place your application dependencies here; they belong
-    // in the individual module build.gradle files
-  }
+    ext {
+        android_plugin_version = '3.3.2'
+        kotlin_version = '1.3.30'
+        kotlinx_coroutines_version = '1.1.1'
+    }
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath "com.android.tools.build:gradle:$android_plugin_version"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
 }
 
 allprojects {
-  repositories {
-    google()
-    jcenter()
-  }
-  ext {
-    // configure versions used by dependencies to harmonize and update easily across all components
-
-    // Android SDK
-    compileSdkVersion = 28
-    minSdkVersion = 21
-    targetSdkVersion = 28
-
-    // Android libraries
-    supportLibraryVersion = '28.0.0'
-
-    // Android test libraries
-    testRunnerVersion = '1.0.2'
-
-    // Supported ABIs for the native libraries (see below)
-    abiFilters = []
-
-    // iink version
-    iinkVersionCode = 1300
-    iinkVersionName = '1.3.0'
-  }
+    repositories {
+        google()
+        jcenter()
+    }
+    ext {
+        // configure versions used by dependencies to harmonize and update easily across all components
+
+        // Android SDK
+        compileSdkVersion = 28
+        minSdkVersion = 21
+        targetSdkVersion = 28
+
+        // Android libraries
+        supportLibraryVersion = '28.0.0'
+
+        // Android test libraries
+        testRunnerVersion = '1.0.2'
+
+        // Supported ABIs for the native libraries (see below)
+        abiFilters = []
+
+        // iink version
+        iinkVersionCode = 1300
+        iinkVersionName = '1.3.0'
+    }
 }
 
 task clean(type: Delete) {
-  delete rootProject.buildDir
+    delete rootProject.buildDir
 }
diff --git a/buildSrc/src/main/groovy/com/myscript/gradle/tasks/FetchRecognitionAssetsTask.groovy b/buildSrc/src/main/groovy/com/myscript/gradle/tasks/FetchRecognitionAssetsTask.groovy
index fa13798..3c69ea0 100644
--- a/buildSrc/src/main/groovy/com/myscript/gradle/tasks/FetchRecognitionAssetsTask.groovy
+++ b/buildSrc/src/main/groovy/com/myscript/gradle/tasks/FetchRecognitionAssetsTask.groovy
@@ -17,24 +17,15 @@ class FetchRecognitionAssetsTask extends DefaultTask {
     void fetchRecognitionAssets() {
         // Thanks to https://gitreleases.dev/
         def baseUrl = "https://gitreleases.dev/gh/jingkecn/myscript-iink-recognition-assets/latest"
-        def urls = [
-                "$baseUrl/myscript-iink-recognition-diagram.zip",
-                "$baseUrl/myscript-iink-recognition-raw-content.zip",
-                "$baseUrl/myscript-iink-recognition-math.zip",
-                "$baseUrl/myscript-iink-recognition-text-en_US.zip"
-        ]
+        def urls = ["$baseUrl/myscript-iink-recognition-math.zip"]
 
         def intoDir = project.file("$project.projectDir/src/main/assets")
         if (!intoDir.isDirectory())
             intoDir.mkdirs()
 
-        def diagramConf = project.file("$intoDir/conf/diagram.conf")
-        def rawContentConf = project.file("$intoDir/conf/raw-content.conf")
         def mathConf = project.file("$intoDir/conf/math.conf")
-        def enUSConf = project.file("$intoDir/conf/en_US.conf")
 
-        if (!diagramConf.exists() || !rawContentConf.exists() || !mathConf.exists()
-                || !enUSConf.exists()) {
+        if (!mathConf.exists()) {
             def fromDir = project.file("$intoDir/temp")
             if (!fromDir.isDirectory())
                 fromDir.mkdirs()
diff --git a/certificate/src/main/java/com/myscript/certificate/MyCertificate.java b/certificate/src/main/java/com/myscript/certificate/MyCertificate.java
index 9ecd0b8..b108a54 100644
--- a/certificate/src/main/java/com/myscript/certificate/MyCertificate.java
+++ b/certificate/src/main/java/com/myscript/certificate/MyCertificate.java
@@ -1,14 +1,614 @@
-/*
- * Copyright (c) MyScript. All rights reserved.
- */
-
 package com.myscript.certificate;
 
+/**
+ * The <code>MyCertificate</code> class provides the bytes of the user
+ * certificate used to grant the access to the MyScript technologies.
+ */
 public final class MyCertificate {
+    /**
+     * The bytes of the user certificate.
+     */
+    private static final byte[] BYTES = new byte[]{
+            91, 63, -14, -6, 78, 43, 86, 34,
+            52, -28, 76, -61, 68, -115, -71, 125,
+            -51, 24, 93, -127, 107, 81, -99, -11,
+            114, 113, 50, 32, 84, -12, -58, -82,
+            120, 109, 125, 119, -100, 114, -117, -8,
+            -102, -59, -117, 21, 127, -24, -12, 45,
+            48, -74, 120, -3, -38, 20, -124, 10,
+            59, -117, 48, -61, -19, 83, 30, 84,
+            21, 71, 102, -15, -22, 113, -70, -49,
+            103, 119, -57, -99, 101, 10, 103, 27,
+            -122, 58, 41, 116, -51, 38, 31, -65,
+            -84, 34, 67, 86, -18, -118, 14, 37,
+            -97, 18, -40, 111, -45, 54, 95, -84,
+            -92, -20, 125, 33, -88, -86, 94, -89,
+            -120, -9, 23, 63, -5, -67, 90, -46,
+            -37, -118, 91, 17, -105, -50, 56, -9,
+            112, 60, 1, 13, 81, 127, 111, 115,
+            7, -112, 74, -17, -82, 53, 66, 36,
+            -44, -13, -3, 96, 72, 105, 77, 79,
+            4, -18, -64, -90, 66, 86, -118, 16,
+            -104, -71, -35, -63, -58, 9, -85, 94,
+            -109, -33, 123, -13, 7, -120, 0, -50,
+            -105, 45, 88, -101, -59, 27, -38, -97,
+            -58, -13, -34, -58, -98, -68, -104, -41,
+            -27, -104, 79, -11, -58, -65, -4, 3,
+            -7, -62, 35, 94, 15, 120, 91, 120,
+            100, 88, -112, 110, 107, 127, 29, -42,
+            -108, -70, -31, -29, -60, -40, -14, 35,
+            -20, -109, -88, -41, 88, 23, 82, 14,
+            46, -74, -6, 121, -12, 35, -4, -30,
+            27, 59, 36, 126, 117, -13, 57, 10,
+            79, 116, 43, 65, -61, -34, 31, -14,
+            34, -89, 109, 30, -82, 72, 28, 65,
+            124, 83, -42, 86, -102, -76, 55, -126,
+            70, -91, 111, 30, 68, 18, -117, 66,
+            -80, 40, 69, 85, 101, 75, -56, 125,
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+            11, -107, 5, -120, 59, -12, 118, 83,
+            -84, -2, 54, -43, -98, 31, 83, 74,
+            -82, -72, -36, 91, 69, -82, -14, -124,
+            59, 16, 99, 4, -31, -104, 70, 79,
+            -66, 102, 78, -111, -46, -31, 95, 77,
+            -36, -7, -99, -24, -61, 22, 92, 92,
+            36, -44, 109, -91, 13, -59, 82, -79,
+            -82, -74, -96, 20, -10, 20, -3, 87,
+            23, -5, -93, -68, -8, -121, 10, -66,
+            120, 20, -103, 87, 6, -101, 14, -27,
+            -103, 71, -24, 48, -48, -22, -85, 112,
+            7, 97, -126, 125, -14, -25, 7, -21,
+            -7, -122, -75, 111, -76, -20, -90, -40,
+            58, 52, 82, -50, -69, -63, 77, 105,
+            -30, -21, 23, -11, -57, 94, -105, 120,
+            87, 68, -72, -64, -21, -65, -34, -110,
+            62, 7, 6, -13, -24, -70, -9, -124,
+            31, 0, -106, 117, 120, 3, -59, 24,
+            -33, -54, 14, 44, 20, 41, -86, -102,
+            -91, -2, 93, -33, 33, 116, -75, 64,
+            -100, 122, -44, 6, -1, -86, -62, -65,
+            -53, 23, 86, -49, -43, -119, 126, -119,
+            126, 28, 18, -83, -42, -54, 71, -3,
+            -17, 33, 121, -127, 27, 11, 101, 52,
+            32, -104, 109, 29, 68, 18, -118, 42,
+            8, -86, -127, 37, -96, -101, 24, -29,
+            87, -50, 65, 115, 60, 97, -24, 48,
+            21, -82, -123, 120, -7, -37, 90, -83,
+            71, -64, 25, 119, 38, 119, -76, 35,
+            12, -82, -72, 18, -89, -111, 68, -92,
+            71, -60, 27, 127, 120, 55, -8
+    };
+
+    /**
+     * Returns the bytes of the user certificate.
+     *
+     * @return The bytes of the user certificate.
+     */
+    public static byte[] getBytes() {
+        return BYTES;
+    }
 
-  public static byte[] getBytes() {
-    throw new RuntimeException(
-        "Please replace the content of MyCertificate.java with the certificate you received from "
-            + "the developer portal");
-  }
-}
+} // end of: class MyCertificate
diff --git a/docs/images/preview.gif b/docs/images/preview.gif
new file mode 100644
index 0000000..e479ea0
Binary files /dev/null and b/docs/images/preview.gif differ