init

AutoCompleteEditText.java

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+package im.dacer;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.WindowManager;
+import android.widget.ArrayAdapter;
+import android.widget.AutoCompleteTextView;
+
+import java.util.ArrayList;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+
+/**
+ * Created by Dacer on 5/23/14.
+ * Show a drop-down list after input a symbol.
+ */
+public class AutoCompleteEditText extends AutoCompleteTextView {
+
+    private ArrayAdapter<String> adapter;
+    private String startAtSymbol = "#";
+
+    public AutoCompleteEditText(Context context){
+        this(context, null);
+    }
+    public AutoCompleteEditText(Context context, AttributeSet attrs){
+        super(context,attrs);
+        init();
+    }
+    public AutoCompleteEditText(Context context, AttributeSet attrs, int defStyle){
+        super(context, attrs, defStyle);
+        init();
+    }
+
+    private void init(){
+        adapter = new ArrayAdapter<String>(getContext(),
+                android.R.layout.simple_dropdown_item_1line, new ArrayList<String>());
+        setAdapter(adapter);
+        setDropDownWidth(WindowManager.LayoutParams.WRAP_CONTENT);
+    }
+
+    /**
+     *
+     * @param symbol default is #
+     */
+    public void setStartAtSymbol(String symbol){
+        startAtSymbol = symbol;
+    }
+
+    /**
+     *
+     * @param dataList The data must start with the symbol
+     */
+    public void setAutoCompleteList(String[] dataList){
+        adapter = new ArrayAdapter<String>(getContext(),
+                android.R.layout.simple_dropdown_item_1line, dataList);
+        setAdapter(adapter);
+    }
+
+    @Override
+    public boolean enoughToFilter() {
+        if(getText() != null){
+            return getText().length() != 0;
+        }
+        return true;
+    }
+
+    @Override
+    protected void performFiltering(CharSequence text, int keyCode){
+        String beforeCursor = getText().toString().substring(0, getSelectionStart());
+        Pattern pattern = Pattern.compile(getRegularExpression());
+        Matcher matcher = pattern.matcher(beforeCursor);
+        if (matcher.find()) {
+            text = matcher.group(0);;
+        }
+        super.performFiltering(text, keyCode);
+    }
+
+    @Override
+    protected void replaceText(CharSequence text){
+        String beforeCursor = getText().toString().substring(0, getSelectionStart());
+        String afterCursor = getText().toString().substring(getSelectionStart());
+
+        Pattern pattern = Pattern.compile("#\\S*");
+        Matcher matcher = pattern.matcher(beforeCursor);
+        StringBuffer sb = new StringBuffer();
+        int matcherStart = 0;
+        while (matcher.find()) {
+            int curPos = getSelectionStart();
+            if(curPos > matcher.start() &&
+                    curPos <= matcher.end()){
+                matcherStart = matcher.start();
+                matcher.appendReplacement(sb, text.toString()+" ");
+            }
+        }
+        matcher.appendTail(sb);
+        setText(sb.toString()+afterCursor);
+        setSelection(matcherStart + text.length()+1);
+    }
+
+
+    private String getRegularExpression(){
+        return startAtSymbol+"\\S*\\z";
+    }
+}

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 Ding Wenhao
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# AutoCompleteEditText
+
+A simple EditText that can show a drop-down list after input '#' symbol.
+
+![AutoCompleteEditText](https://raw.github.com/dacer/AndroidCharts/master/preview.gif)
+It was used in [Pomotodo](https://play.google.com/store/apps/details?id=com.pomotodo)
+
+## Usage
+
+```xml
+<im.dacer.AutoCompleteEditText
+    android:id="@+id/edit_text"
+    android:layout_height="wrap_content"
+    android:layout_width="fill_parent"/>
+```
+
+```java
+AutoCompleteEditText editText = (AutoCompleteEditText) findViewById(R.id.edit_text);
+editText.setStartAtSymbol("#");
+editText.setAutoCompleteList(list);
+```
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2014 Ding Wenhao
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+## Contributing
+
+Please fork this repository and contribute back using
+[pull requests](https://github.com/github/android/pulls).
+
+Any contributions, large or small, major features, bug fixes, additional
+language translations, unit/integration tests are welcomed