自由手記

main.xml如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <AutoCompleteTextView
        android:id="@+id/edit"
        android:layout_width="230dip"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dip" />

</LinearLayout>

程序代碼如下：

package com.android.system.AutoComplete;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AutoCompleteTextView;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

public class AutoComplete extends Activity {
	AutoCompleteTextView autoview;

	// default city
	String[] stringArray = { "@163.com", "@126.com", "@qq.com", "@sina.com", "@taobao.com" };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		autoview = (AutoCompleteTextView) findViewById(R.id.edit);
//		adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, stringArray);
		final MyAdatper adapter = new MyAdatper(this);
		autoview.setAdapter(adapter);
		autoview.addTextChangedListener(new TextWatcher() {
			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {
			}
			@Override
			public void beforeTextChanged(CharSequence s, int start, int count, int after) {
			}
			@Override
			public void afterTextChanged(Editable s) {
				String input = s.toString();
				adapter.mList.clear();
				if (input.length() > 0) {
					for (int i = 0; i < stringArray.length; ++i) {
						adapter.mList.add(input + stringArray[i]);
					}
				}
				adapter.notifyDataSetChanged();
				autoview.showDropDown();
				
			}
		});

		// default=2
		autoview.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();
	            }
			}
			
		}
		
	}
	
}

From：CSDN