Add missing files

src/main/res/layout/layout_scanner.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/content_frame"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <include layout="@layout/toolbar_light_dark" />
+</FrameLayout>

src/main/scala/com/github/shadowsocks/ScannerActivity.scala

@@ -0,0 +1,74 @@
+package com.github.shadowsocks
+
+import android.app.Activity
+import android.content.Intent
+import android.os.Bundle
+import android.os.Handler
+import android.support.v4.app.NavUtils
+import android.support.v7.app.ActionBar
+import android.support.v7.app.AppCompatActivity
+import android.support.v7.widget.Toolbar
+import android.util.AttributeSet
+import android.util.TypedValue
+import android.view.MenuItem
+import android.view.View
+import android.view.ViewGroup
+
+import com.google.zxing.Result
+
+import me.dm7.barcodescanner.core.IViewFinder
+import me.dm7.barcodescanner.core.ViewFinderView
+import me.dm7.barcodescanner.zxing.ZXingScannerView
+
+class ScannerActivity extends AppCompatActivity with ZXingScannerView.ResultHandler {
+    var scannerView: ZXingScannerView = null
+
+    override def onCreate(state: Bundle) {
+        super.onCreate(state)
+        setContentView(R.layout.layout_scanner)
+        setupToolbar()
+
+        scannerView = new ZXingScannerView(this)
+        val contentFrame = findViewById(R.id.content_frame).asInstanceOf[ViewGroup]
+        contentFrame.addView(scannerView)
+    }
+
+    override def onResume() {
+        super.onResume()
+        scannerView.setResultHandler(this) // Register ourselves as a handler for scan results.
+        scannerView.startCamera()          // Start camera on resume
+    }
+
+    override def onPause() {
+        super.onPause()
+        scannerView.stopCamera()           // Stop camera on pause
+    }
+
+    override def handleResult(rawResult: Result) = {
+        val intent = new Intent()
+        intent.putExtra("uri", rawResult.getText)
+        setResult(Activity.RESULT_OK, intent)
+        finish()
+    }
+
+    def setupToolbar() {
+        val toolbar = findViewById(R.id.toolbar).asInstanceOf[Toolbar]
+        setSupportActionBar(toolbar)
+        val ab = getSupportActionBar()
+        if (ab != null) {
+            ab.setDisplayHomeAsUpEnabled(true)
+        }
+    }
+
+    override def onOptionsItemSelected(item: MenuItem): Boolean = {
+        item.getItemId() match {
+            // Respond to the action bar's Up/Home button
+            case android.R.id.home =>
+                setResult(Activity.RESULT_CANCELED, new Intent())
+                finish()
+                return true
+        }
+        return super.onOptionsItemSelected(item)
+    }
+}
+