android小知识之邮箱地址输入自动完成

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();  
                    }  
            }  
              
    }  
}

主要的xml 部分文件：

 <AutoCompleteTextView
        android:id="@+id/set_manageaccount_reemail_act_emialaddress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:background="@drawable/edt_bg"
        android:singleLine="true"
        android:ems="10"
        android:hint="请输入邮箱地址" >

        <requestFocus />
    </AutoCompleteTextView>

继续学习！