Add new Android voice translator sample app

This adds a simple voice translator Android app that uses
the JNI bindings to the PGF C runtime.

Caveats:

- Since the C runtime doesn't compile for Android right now,
  I've bundled an old copy, along with its Java bindings.
  That should be removed once the C runtime compiels for Android
  again.

- Adding an automated build would be nice.

- Replacing the grammar requires editing a Java file, that should 
  really be more dynamic.

4 files changed, 116 insertions, 0 deletions

diff --git a/src/ui/android/res/layout/activity_main.xml b/src/ui/android/res/layout/activity_main.xml
new file mode 100644
index 000000000..b0ccab0ea
--- /dev/null
+++ b/src/ui/android/res/layout/activity_main.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_height="match_parent"
+        android:layout_width="match_parent"
+        >
+
+    <RelativeLayout
+            android:id="@+id/top_bg"
+            android:layout_height="wrap_content"
+            android:layout_width="match_parent"
+            android:layout_alignParentTop="true"
+            android:layout_alignParentLeft="true"
+            android:layout_alignParentRight="true"
+            android:padding="8dp"
+            android:background="#C0C0C0"
+            >
+
+        <ImageView
+                android:id="@+id/start_stop"
+                android:layout_height="wrap_content"
+                android:layout_width="wrap_content"
+                android:layout_alignTop="@+id/source_language"
+                android:layout_alignBottom="@+id/target_language"
+                android:layout_alignParentRight="true"
+                android:padding="8dp"
+                android:src="@drawable/ic_mic"
+                android:background="?android:attr/selectableItemBackground"
+                android:contentDescription="@string/microphone"
+                />
+
+        <ImageView
+                android:id="@+id/switch_languages"
+                android:layout_height="wrap_content"
+                android:layout_width="wrap_content"
+                android:layout_alignTop="@+id/source_language"
+                android:layout_alignBottom="@+id/target_language"
+                android:layout_toLeftOf="@id/start_stop"
+                android:padding="8dp"
+                android:src="@drawable/ic_action_switch"
+                android:background="?android:attr/selectableItemBackground"
+                android:contentDescription="@string/switch_languages"
+                />
+
+        <org.grammaticalframework.ui.android.LanguageSelector
+                android:id="@+id/source_language"
+                android:layout_height="wrap_content"
+                android:layout_width="match_parent"
+                android:layout_alignParentLeft="true"
+                android:layout_alignParentTop="true"
+                android:layout_toLeftOf="@id/switch_languages"
+                android:padding="0dp"
+                />
+
+        <org.grammaticalframework.ui.android.LanguageSelector
+                android:id="@+id/target_language"
+                android:layout_height="wrap_content"
+                android:layout_width="match_parent"
+                android:layout_below="@id/source_language"
+                android:layout_toLeftOf="@id/switch_languages"
+                android:padding="0dp"
+                />
+
+    </RelativeLayout>
+
+    <org.grammaticalframework.ui.android.ConversationView
+            android:id="@+id/conversation"
+            android:layout_height="match_parent"
+            android:layout_width="match_parent"
+            android:layout_alignParentLeft="true"
+            android:layout_alignParentBottom="true"
+            android:layout_alignParentRight="true"
+            android:layout_below="@id/top_bg"
+            >
+        <LinearLayout
+                android:id="@+id/conversation_content"
+                android:layout_height="wrap_content"
+                android:layout_width="match_parent"
+                android:orientation="vertical"
+                android:padding="16dp"
+                >
+        </LinearLayout>
+    </org.grammaticalframework.ui.android.ConversationView>
+
+</RelativeLayout>
\ No newline at end of file
diff --git a/src/ui/android/res/layout/first_person_utterance.xml b/src/ui/android/res/layout/first_person_utterance.xml
new file mode 100644
index 000000000..55779ae8f
--- /dev/null
+++ b/src/ui/android/res/layout/first_person_utterance.xml
@@ -0,0 +1,11 @@
+<TextView
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_height="wrap_content"
+        android:layout_width="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:layout_marginRight="32dp"
+        android:layout_gravity="left"
+        android:padding="8dp"
+        android:textSize="20sp"
+        android:background="@drawable/first_person_utterance_bg"
+        />
diff --git a/src/ui/android/res/layout/languages_item.xml b/src/ui/android/res/layout/languages_item.xml
new file mode 100644
index 000000000..d5f47ab27
--- /dev/null
+++ b/src/ui/android/res/layout/languages_item.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_height="wrap_content"
+        android:layout_width="match_parent"
+        android:padding="8dp"
+        android:textSize="20sp"
+        />
diff --git a/src/ui/android/res/layout/second_person_utterance.xml b/src/ui/android/res/layout/second_person_utterance.xml
new file mode 100644
index 000000000..416d85328
--- /dev/null
+++ b/src/ui/android/res/layout/second_person_utterance.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_height="wrap_content"
+        android:layout_width="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:layout_marginLeft="32dp"
+        android:layout_gravity="right"
+        android:padding="8dp"
+        android:textSize="20sp"
+        android:background="@drawable/second_person_utterance_bg"
+        />