Allow user to use any QR code scanner and remove unused resources

src/main/AndroidManifest.xml

@@ -8,8 +8,6 @@
 
     <uses-feature android:name="android.hardware.touchscreen"
                   android:required="false"/>
-    <uses-feature android:name="android.hardware.camera"
-                  android:required="false"/>
     <uses-feature android:name="android.hardware.nfc"
                   android:required="false"/>
     <uses-feature android:name="android.software.leanback"

src/main/res/layout/layout_scanner.xml

@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical">
-    <include layout="@layout/toolbar_light_dark" />
-    <me.dm7.barcodescanner.zxing.ZXingScannerView android:id="@+id/scanner"
-                                                  android:layout_width="match_parent"
-                                                  android:layout_height="0dp"
-                                                  android:layout_weight="1"/>
-</LinearLayout>

src/main/res/values-ja/strings.xml

@@ -87,7 +87,6 @@
   <string name="add_profile_dialog">シャドーソックスにプロファイルを追加しますか</string>
   <string name="add_profile_methods_scan_qr_code">QRコードを読み取る</string>
   <string name="add_profile_methods_manual_settings">手動でセットアップ</string>
-  <string name="add_profile_scanner_permission_required">QRコードを読み取るにはカメラの使用権限が必要です。</string>
 
   <string-array name="route_entry">
     <item>すべて</item>

src/main/res/values-ru/strings.xml

@@ -108,7 +108,6 @@
   <string name="add_profile_dialog">Добавить этот Профиль Shadowsocks?</string>
   <string name="add_profile_methods_scan_qr_code">Сканировать QR код</string>
   <string name="add_profile_methods_manual_settings">Настройка вручную</string>
-  <string name="add_profile_scanner_permission_required">Разрешение камеры требуется для сканирования QR код.</string>
   <string name="copy_url">Копировать URL</string>
   <plurals name="removed">
     <item quantity="one">Удалён</item>

src/main/res/values-zh-rCN/strings.xml

@@ -98,7 +98,7 @@
   <string name="add_profile_dialog">为影梭添加此配置文件？</string>
   <string name="add_profile_methods_scan_qr_code">扫描二维码</string>
   <string name="add_profile_methods_manual_settings">手动设置</string>
-  <string name="add_profile_scanner_permission_required">扫描二维码需要相机权限。</string>
+  <string name="add_profile_scanner_not_installed">请安装任意兼容 ZXing 的二维码扫描应用。</string>
 
   <string-array name="route_entry">
     <item>全局</item>

src/main/res/values-zh-rTW/strings.xml

@@ -99,7 +99,7 @@
   <string name="add_profile_dialog">為 Shadowsocks 新增此設定檔？</string>
   <string name="add_profile_methods_scan_qr_code">掃描 QR 碼</string>
   <string name="add_profile_methods_manual_settings">手動設定</string>
-  <string name="add_profile_scanner_permission_required">掃描 QR 碼需要相機權限。</string>
+  <string name="add_profile_scanner_not_installed">請安裝任何兼容 ZXing 的 QR 碼掃描應用程式。</string>
 
   <string-array name="route_entry">
     <item>全域</item>

src/main/res/values/strings.xml

@@ -127,7 +127,7 @@
   <string name="add_profile_dialog">Add this Shadowsocks Profile?</string>
   <string name="add_profile_methods_scan_qr_code">Scan QR code</string>
   <string name="add_profile_methods_manual_settings">Manual Settings</string>
-  <string name="add_profile_scanner_permission_required">Camera permission is required for scanning QR code.</string>
+  <string name="add_profile_scanner_not_installed">Please install any ZXing-compliant QR code scanning app.</string>
   <string name="copy_url">Copy URL</string>
   <plurals name="removed">
     <item quantity="one">Removed</item>

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

@@ -22,7 +22,9 @@ package com.github.shadowsocks
 
 import java.util.GregorianCalendar
 
+import android.app.Activity
 import android.content._
+import android.net.Uri
 import android.os.Bundle
 import android.support.v7.widget.RecyclerView.ViewHolder
 import android.support.v7.widget._
@@ -306,18 +308,23 @@ final class ProfilesFragment extends ToolbarFragment with Toolbar.OnMenuItemClic
   }
 
   override def onActivityResult(requestCode: Int, resultCode: Int, data: Intent): Unit = requestCode match {
-    case REQUEST_SCAN_QR_CODE =>
+    case REQUEST_SCAN_QR_CODE => if (resultCode == Activity.RESULT_OK) {
       val contents = data.getStringExtra("SCAN_RESULT")
       if (!TextUtils.isEmpty(contents)) Parser.findAll(contents).foreach(app.profileManager.createProfile)
+    }
     case _ => super.onActivityResult(resultCode, resultCode, data)
   }
 
   def onMenuItemClick(item: MenuItem): Boolean = item.getItemId match {
     case R.id.action_scan_qr_code =>
-      startActivityForResult(new Intent("com.google.zxing.client.android.SCAN")
+      try startActivityForResult(new Intent("com.google.zxing.client.android.SCAN")
         .addCategory(Intent.CATEGORY_DEFAULT)
         .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_DOCUMENT),
-        REQUEST_SCAN_QR_CODE)
+        REQUEST_SCAN_QR_CODE) catch {
+        case _: ActivityNotFoundException =>
+          Toast.makeText(getActivity, R.string.add_profile_scanner_not_installed, Toast.LENGTH_LONG).show()
+          startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=tw.com.quickmark")))
+      }
       true
     case R.id.action_import =>
       if (clipboard.hasPrimaryClip) {