add autocomplete functionality

demo/src/main/java/me/gujun/android/taggroup/demo/TagEditorActivity.java

@@ -1,9 +1,12 @@
 package me.gujun.android.taggroup.demo;
 
+import android.content.Context;
 import android.os.Bundle;
 import android.support.v7.app.ActionBarActivity;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.widget.ArrayAdapter;
+import android.widget.Filter;
 
 import me.gujun.android.taggroup.TagGroup;
 import me.gujun.android.taggroup.demo.db.TagsManager;
@@ -22,6 +25,7 @@ protected void onCreate(Bundle savedInstanceState) {
         String[] tags = mTagsManager.getTags();
 
         mTagGroup = (TagGroup) findViewById(R.id.tag_group);
+        mTagGroup.setAutoCompleteAdapter(new TagAutoCompleteAdapter(this));
         mTagGroup.setTags(tags);
     }
 
@@ -49,4 +53,39 @@ public void onBackPressed() {
         mTagsManager.updateTags(mTagGroup.getTags());
         super.onBackPressed();
     }
+
+    private class TagAutoCompleteAdapter extends ArrayAdapter<String>  {
+        public TagAutoCompleteAdapter(Context context) {
+            super(context, R.layout.autocomplete_row);
+        }
+
+        @Override
+        public Filter getFilter() {
+            return new Filter() {
+                @Override
+                protected Filter.FilterResults performFiltering(CharSequence constraint) {
+                    Filter.FilterResults result = new Filter.FilterResults();
+                    result.count = 0;
+                    if(constraint!=null) {
+                        String[] data = mTagsManager.getAutoCompleteData(TagEditorActivity.this, constraint.toString());
+                        result.values = data;
+                        result.count = data.length;
+                    }
+                    return result;
+                }
+
+                @Override
+                protected void publishResults(CharSequence constraint, Filter.FilterResults results) {
+                    clear();
+                    if (results.count > 0) {
+                        for (String s : (String[]) results.values) {
+                            add(s);
+                        }
+                    }
+                    notifyDataSetChanged();
+                }
+            };
+        }
+
+    }
 }

demo/src/main/java/me/gujun/android/taggroup/demo/db/TagsManager.java

@@ -4,9 +4,15 @@
 import android.content.Context;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
+import android.text.TextUtils;
 
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
+import java.util.Random;
+
+import me.gujun.android.taggroup.demo.R;
 
 /**
  * Manage the tags from SQLite database.
@@ -65,4 +71,17 @@ public void clearTags() {
         db.delete(TagsTable.TABLE_NAME, null, null);
         db.close();
     }
+    public String[] getAutoCompleteData(Context context,String _query) {
+        //Return countries
+        String[] data = context.getResources().getStringArray(R.array.countries_array);
+        String query = _query.toLowerCase();
+        ArrayList<String> filtredData = new ArrayList<>();
+
+        for (String d : data) {
+            if(d.toLowerCase().startsWith(query))
+                filtredData.add(d);
+        }
+
+        return  filtredData.toArray(new String[filtredData.size()]);
+    }
 }

demo/src/main/res/layout/autocomplete_row.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@android:id/text1"
+    style="@android:style/TextAppearance.Small"
+    android:textAppearance="?android:attr/textAppearanceSmall"
+    android:textColor="#000"
+    android:paddingTop="5dp"
+    android:paddingBottom="5dp"
+    android:singleLine="true"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:ellipsize="marquee" />

library/src/main/java/me/gujun/android/taggroup/SpaceTokenizer.java

@@ -0,0 +1,61 @@
+package me.gujun.android.taggroup;
+
+import android.text.SpannableString;
+import android.text.Spanned;
+import android.text.TextUtils;
+import android.widget.MultiAutoCompleteTextView;
+
+/**
+ * http://stackoverflow.com/questions/3482981/how-to-replace-the-comma-with-a-space-when-i-use-the-multiautocompletetextview
+ */
+public class SpaceTokenizer implements MultiAutoCompleteTextView.Tokenizer {
+
+    public int findTokenStart(CharSequence text, int cursor) {
+        int i = cursor;
+
+        while (i > 0 && text.charAt(i - 1) != ' ') {
+            i--;
+        }
+        while (i < cursor && text.charAt(i) == ' ') {
+            i++;
+        }
+
+        return i;
+    }
+
+    public int findTokenEnd(CharSequence text, int cursor) {
+        int i = cursor;
+        int len = text.length();
+
+        while (i < len) {
+            if (text.charAt(i) == ' ') {
+                return i;
+            } else {
+                i++;
+            }
+        }
+
+        return len;
+    }
+
+    public CharSequence terminateToken(CharSequence text) {
+        int i = text.length();
+
+        while (i > 0 && text.charAt(i - 1) == ' ') {
+            i--;
+        }
+
+        if (i > 0 && text.charAt(i - 1) == ' ') {
+            return text;
+        } else {
+            if (text instanceof Spanned) {
+                SpannableString sp = new SpannableString(text + " ");
+                TextUtils.copySpansFrom((Spanned) text, 0, text.length(),
+                        Object.class, sp, 0);
+                return sp;
+            } else {
+                return text + " ";
+            }
+        }
+    }
+}