Port Signal's emoji implementation to Briar

Add functionality to save and restore recently used Emojis

Update emoji and add new categories based on AOSP's XML file

briar-android/src/org/briarproject/android/view/ArticleMovementMethod.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.briarproject.android.view;
+
+import android.text.Layout;
+import android.text.Spannable;
+import android.text.method.ArrowKeyMovementMethod;
+import android.text.method.MovementMethod;
+import android.text.style.ClickableSpan;
+import android.view.MotionEvent;
+import android.widget.TextView;
+
+public class ArticleMovementMethod extends ArrowKeyMovementMethod {
+
+	private static ArticleMovementMethod sInstance;
+
+	public static MovementMethod getInstance() {
+		if (sInstance == null) {
+			sInstance = new ArticleMovementMethod();
+		}
+		return sInstance;
+	}
+
+	@Override
+	public boolean onTouchEvent(TextView widget, Spannable buffer,
+			MotionEvent event) {
+		int action = event.getAction();
+
+		if (action == MotionEvent.ACTION_UP) {
+			int x = (int) event.getX();
+			int y = (int) event.getY();
+
+			x -= widget.getTotalPaddingLeft();
+			y -= widget.getTotalPaddingTop();
+
+			x += widget.getScrollX();
+			y += widget.getScrollY();
+
+			Layout layout = widget.getLayout();
+			int line = layout.getLineForVertical(y);
+			int off = layout.getOffsetForHorizontal(line, x);
+
+			ClickableSpan[] link =
+					buffer.getSpans(off, off, ClickableSpan.class);
+
+			if (link.length != 0) {
+				link[0].onClick(widget);
+			}
+		}
+		return super.onTouchEvent(widget, buffer, event);
+	}
+
+}