Add Datachannel support to Android AppRTCMobile

webrtc/examples/androidapp/res/xml/preferences.xml

 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
     <PreferenceCategory
         android:key="@string/pref_videosettings_key"
         android:title="@string/pref_videosettings_title">
 
         <CheckBoxPreference
             android:key="@string/pref_videocall_key"
             android:title="@string/pref_videocall_title"
             android:dialogTitle="@string/pref_videocall_dlg"
@@ skipping 138 matching lines @@
         <ListPreference
             android:key="@string/pref_speakerphone_key"
             android:title="@string/pref_speakerphone_title"
             android:defaultValue="@string/pref_speakerphone_default"
             android:dialogTitle="@string/pref_speakerphone_dlg"
             android:entries="@array/speakerphone"
             android:entryValues="@array/speakerphoneValues" />
     </PreferenceCategory>
 
     <PreferenceCategory
+        android:key="@string/pref_datasettings_key"
+        android:title="@string/pref_datasettings_title">
+
+        <CheckBoxPreference
+            android:key="@string/pref_enable_datachannel_key"
+            android:title="@string/pref_enable_datachannel_title"
+            android:defaultValue="@string/pref_enable_datachannel_default" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_ordered_key"
+            android:title="@string/pref_ordered_title"
+            android:defaultValue="@string/pref_ordered_default" />
+
+        <EditTextPreference
+            android:key="@string/pref_data_protocol_key"

[magjed_webrtc, 2016/11/17 10:51:05]

Do we really need to expose all these data settings at this point? What use case
do we have that needs anything else than the default settings?

+            android:title="@string/pref_data_protocol_title"
+            android:inputType="text"
+            android:defaultValue="@string/pref_data_protocol_default"
+            android:dialogTitle="@string/pref_data_protocol_dlg" />
+
+        <CheckBoxPreference
+            android:key="@string/pref_negotiated_key"
+            android:title="@string/pref_negotiated_title"
+            android:defaultValue="@string/pref_negotiated_default" />
+
+        <EditTextPreference
+            android:key="@string/pref_max_retransmit_time_ms_key"
+            android:title="@string/pref_max_retransmit_time_ms_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_max_retransmit_time_ms_default"
+            android:dialogTitle="@string/pref_max_retransmit_time_ms_dlg" />
+
+        <EditTextPreference
+            android:key="@string/pref_max_retransmits_key"
+            android:title="@string/pref_max_retransmits_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_max_retransmits_default"
+            android:dialogTitle="@string/pref_max_retransmits_dlg" />
+
+        <EditTextPreference
+            android:key="@string/pref_data_id_key"
+            android:title="@string/pref_data_id_title"
+            android:inputType="number"
+            android:defaultValue="@string/pref_data_id_default"
+            android:dialogTitle="@string/pref_data_id_dlg" />
+    </PreferenceCategory>
+
+    <PreferenceCategory
         android:key="@string/pref_miscsettings_key"
         android:title="@string/pref_miscsettings_title">
 
         <EditTextPreference
             android:key="@string/pref_room_server_url_key"
             android:title="@string/pref_room_server_url_title"
             android:inputType="text"
             android:defaultValue="@string/pref_room_server_url_default"
             android:dialogTitle="@string/pref_room_server_url_dlg" />
 
         <CheckBoxPreference
             android:key="@string/pref_displayhud_key"
             android:title="@string/pref_displayhud_title"
             android:dialogTitle="@string/pref_displayhud_dlg"
            android:defaultValue="@string/pref_displayhud_default" />
 
         <CheckBoxPreference
             android:key="@string/pref_tracing_key"
             android:title="@string/pref_tracing_title"
             android:dialogTitle="@string/pref_tracing_dlg"
            android:defaultValue="@string/pref_tracing_default" />
     </PreferenceCategory>
 
 </PreferenceScreen>