Support sharing via QR code

Another popular format is barcode but unfortunately I cannot seem to find documentations of that anywhere. Feel free to send me.

mobile/src/main/res/drawable/ic_social_share.xml

@@ -0,0 +1,6 @@
+<vector android:autoMirrored="true" android:height="24dp"
+    android:viewportHeight="24.0" android:viewportWidth="24.0"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android"
+        android:tint="?attr/colorControlNormal">
+    <path android:fillColor="#FF000000" android:pathData="M18,16.08c-0.76,0 -1.44,0.3 -1.96,0.77L8.91,12.7c0.05,-0.23 0.09,-0.46 0.09,-0.7s-0.04,-0.47 -0.09,-0.7l7.05,-4.11c0.54,0.5 1.25,0.81 2.04,0.81 1.66,0 3,-1.34 3,-3s-1.34,-3 -3,-3 -3,1.34 -3,3c0,0.24 0.04,0.47 0.09,0.7L8.04,9.81C7.5,9.31 6.79,9 6,9c-1.66,0 -3,1.34 -3,3s1.34,3 3,3c0.79,0 1.5,-0.31 2.04,-0.81l7.12,4.16c-0.05,0.21 -0.08,0.43 -0.08,0.65 0,1.61 1.31,2.92 2.92,2.92 1.61,0 2.92,-1.31 2.92,-2.92s-1.31,-2.92 -2.92,-2.92z"/>
+</vector>

mobile/src/main/res/menu/toolbar_configuration.xml

@@ -11,4 +11,8 @@
           android:icon="?attr/actionModePasteDrawable"
           android:title="@android:string/paste"
           app:showAsAction="ifRoom"/>
+    <item android:id="@+id/share_qr"
+          android:icon="@drawable/ic_social_share"
+          android:title="@string/configuration_share"
+          app:showAsAction="ifRoom"/>
 </menu>

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

@@ -126,6 +126,7 @@
     <string name="noisy_su_failure">发生异常，详情请查看调试信息。</string>
 
     <string name="configuration_view">设置 WLAN 中继</string>
+    <string name="configuration_share">使用 QR 码分享</string>
     <string name="configuration_rejected">Android 系统拒绝使用此配置。（详情参见日志）</string>
     <string name="wifi_ssid" msgid="5519636102673067319">"网络名称"</string>
     <string name="wifi_security" msgid="6603611185592956936">"安全性"</string>

mobile/src/main/res/values/dimen.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <dimen name="listitem_manage_tether_padding_start">56dp</dimen>
+    <dimen name="qr_code_size">250dp</dimen>
 </resources>

mobile/src/main/res/values/strings.xml

@@ -134,6 +134,7 @@
     <string name="noisy_su_failure">Something went wrong, please check the debug information.</string>
 
     <string name="configuration_view">Wi\u2011Fi configuration</string>
+    <string name="configuration_share">Share via QR code</string>
     <string name="configuration_rejected">Android system refuses such configuration. (see logcat)</string>
     <string name="wifi_ssid">Network name</string>
     <string name="wifi_security">Security</string>