Android自定义AutoCompleteTextView实现自动补全Email

public class AutoComplete extends AutoCompleteTextView {
//输入字符进行联想，@163.com、@126.com、@qq.com、@sina.com、@yeah.net、@yahoo.com、@gmail.com等常用邮箱
private static final String[] emailSuffix = {"@qq.com", "@163.com", "@126.com", "@gmail.com", "@sina.com", "@hotmail.com",
"@yahoo.cn", "@sohu.com", "@foxmail.com", "@139.com", "@yeah.net", "@vip.qq.com", "@vip.sina.com"};

public AutoComplete(Context context) {
super(context);
init(context);
}

public AutoComplete(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}

private void init(Context context) {
final MyAdatper adapter = new MyAdatper(context);
setAdapter(adapter);
addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
String input = s.toString();
adapter.mList.clear();
if (input.length() > 0) {
for (int i = 0; i < emailSuffix.length; ++i) {
adapter.mList.add(input + emailSuffix[i]);
}
}
adapter.notifyDataSetChanged();
showDropDown();
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {

}

@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
});
// default=2 当输入一个字符的时候就开始检测
setThreshold(1);
}

class MyAdatper extends BaseAdapter implements Filterable {
List<String> mList;
private Context mContext;
private MyFilter mFilter;

public MyAdatper(Context context) {
mContext = context;
mList = new ArrayList<String>();
}

@Override
public int getCount() {
return mList == null ? 0 : mList.size();
}

@Override
public Object getItem(int position) {
return mList == null ? null : mList.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
TextView tv = new TextView(mContext);
tv.setTextColor(Color.BLACK);
tv.setTextSize(20);
convertView = tv;
}
TextView txt = (TextView) convertView;
txt.setText(mList.get(position));
return txt;
}

@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new MyFilter();
}
return mFilter;
}

private class MyFilter extends Filter {

@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (mList == null) {
mList = new ArrayList<String>();
}
results.values = mList;
results.count = mList.size();
return results;
}

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
}
}

<fashion.test.com.email.AutoComplete
android:layout_width="match_parent"
android:layout_height="wrap_content" />