android小知识之邮箱地址输入自动完成

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虽然不难，但是容易忘记，做个备忘吧

package com.guet.zhuge;import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.AutoCompleteTextView;public class MainActivity extends Activity implements TextWatcher{ private AutoCompleteTextView autoview;
private AutoTextViewAdapter adapter; private static final String[] AUTO_EMAILS = {"@163.com", "@sina.com", "@qq.com", "@126.com", "@gmail.com", "@apple.com"}; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
autoview = (AutoCompleteTextView) findViewById(R.id.auto_tv);
adapter = new AutoTextViewAdapter(this);
autoview.setAdapter(adapter);
autoview.setThreshold(1);//输入1个字符时就开始检测，默认为2个
autoview.addTextChangedListener(this);//监听autoview的变化
} @Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
String input = s.toString();
adapter.mList.clear();
autoAddEmails(input);
adapter.notifyDataSetChanged();
autoview.showDropDown();
} /**
* 自动填充邮箱列表
* @param input
*/
private void autoAddEmails(String input) {
System.out.println("input-->" + input);
String autoEmail = "";
if (input.length() > 0) {
for (int i = 0; i < AUTO_EMAILS.length; ++i) {
if(input.contains("@")) {//包含“@”则开始过滤
String filter = input.substring(input.indexOf("@") + 1 , input.length());//获取过滤器，即根据输入“@”之后的内容过滤出符合条件的邮箱
System.out.println("filter-->" + filter);
if(AUTO_EMAILS[i].contains(filter)) {//符合过滤条件
autoEmail = input.substring(0, input.indexOf("@")) + AUTO_EMAILS[i];//用户输入“@”之前的内容加上自动填充的内容即为最后的结果
adapter.mList.add(autoEmail);
}
}else {
autoEmail = input + AUTO_EMAILS[i];
adapter.mList.add(autoEmail);
}
}
}
} @Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub } @Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub }
}

适配器代码如下：

package com.guet.zhuge;import java.util.ArrayList;
import java.util.List;import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;public class AutoTextViewAdapter extends BaseAdapter implements Filterable { public List<String> mList;
private Context mContext;
private MyFilter mFilter; public AutoTextViewAdapter(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;
} 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();
}
} }
}