android开发笔记-EditText自动补全功能

精创之作《雷神的微软平台安全宝典》诚邀译者                                             移动业界领袖会议·上海·6.20 
CSDN博客频道“移动开发之我见”主题征文活动          【分享季1】：网友推荐130个经典资源，分享再赠分！

 

Android开发笔记-EditText自动补全功能

分类： android 2012-05-21 18:28  8人阅读  评论(0)  收藏  举报

项目开发之需要, 根据用户拼音或代码检索出用户信息. 现在有两种方法可以实现.

1. 使用android系统自带组件: AutoCompleteTextView .

效果图如下:

布局文件:

auto_textview.xml

 

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

     <TextView android:id="@+id/selection6"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"   />
     <AutoCompleteTextView android:id="@+id/editAuto"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:completionThreshold ="1" />

</LinearLayout>

 

 

 2. java代码:

public class AutoComplementTest extends Activity {

    private AutoCompleteTextView edit;
    private String[]  items={"lorem", "ipsum", "dolor", "sit", "amet", "consectetuer", "adipiscing", "elit", "morbi", "vel", "ligula", "vitae", "arcu", "aliquet", "mollis", "etiam", "vel", "erat", "placerat", "ante", "porttitor", "sodales", "pellentesque", "augue", "purus"};


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.auto_textview);
        edit = (AutoCompleteTextView)findViewById(R.id .editAuto);
        //步骤1：设置适配器
        edit.setAdapter (new ArrayAdapter<String>(this ,android.R.layout.simple_dropdown_item_1line ,items ));

    }

}

 

此法的弊端: 不能根据字母拼音或代码检索, 只能根据返回的值自动补全, 拓展性不全.

 

 

方法二:

EditText和ListView组合成类似自动补全功能.

 

效果图如下:

 

 

布局文件代码:

 

<EditText android:id="@+id/edit_key"
                            android:layout_width="fill_parent"
                            android:layout_height="32dip"
                            android:layout_marginLeft="2dip"
                            android:layout_marginTop="4dip"
                            android:layout_marginBottom="4dip"
                            android:paddingTop="8dip"
                            android:paddingBottom="4dip"
                            android:focusable="false"
                            android:layout_marginRight="12dip"
                            android:background="@drawable/qt_search_txt"
                            />


                        <ListView android:id="@+id/lstv_all"
                            android:layout_width="fill_parent"
                            android:layout_height="wrap_content" />

 

java代码:

 

public class LoadableStockListActivity extends ListActivity{

    private StringBuffer sb = new StringBuffer();

    private EditText txtKey;
    private ListView listView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.loadable_stock_list_activity);


        foursquared = ((Foursquared)this.getApplication());

        mEmptyProgress = (ProgressBar) findViewById(R.id.emptyProgress);
        mEmptyText = (TextView) findViewById(R.id.emptyText);
        setLoadingView();


        txtKey = (EditText)findViewById(R.id.edit_key);

        listView = (ListView)findViewById(R.id.lstv_all);
        //添加文本改变事件
        txtKey.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

                key =  txtKey.getText().toString();
                if(key!=null && !"".equals(key.trim())){
                    Log.i(TAG , " key:"+key);
                    List<Map<String , String>> lst = foursquared.getSelectStock(key);//根据关键字查询股票代码
                    StockListAdapter stockAdapter = new StockListAdapter(LoadableStockListActivity.this , lst);
                    listView.setAdapter(stockAdapter);
                }else{
                    listView.setAdapter(null);
                }
            }

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

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

        //查询所有股票相关数据
        List<Map<String , String>> lst = foursquared.getSelectStock(null);
        //自定义ListView适配器
        StockListAdapter stockAdapter = new StockListAdapter(this , lst);
        //设置适配器
        listView.setAdapter(stockAdapter);
}

 

  getSelectStock()方法详解:

/**
     * 获取股票代码信息列表
     * @return
     */
    public List<Map<String , String>> getSelectStock(String key){

        stockDB.open();
        List<Map<String , String>> stocks = stockDB.selectStock(key);
        stockDB.close();

        return stocks;

    }


selectStock()方法详解:(欲了解stockDB具体代码,请参考: 上篇:android开发笔记-sqllite操作)

public List<Map<String , String>> selectStock(String key){

        if(!db.isOpen()){
            db = dbHelper.getReadableDatabase();
        }

        List<Map<String , String>> stockList = new ArrayList<Map<String , String>>();

        Cursor cur = null;

        if(null!=key && !"".equals(key)){

            //查询的列字段名
            String [] columns = {CODE , NAME , SIMPLE};
            //查询条件
            String where =  CODE+ " like ? or "+NAME+" like ? or "+SIMPLE+" like ? ";
            //查询参数
            String [] selectArgs = {key+"%" , key+"%" , key+"%"};
            //执行查询
            cur = db.query(DATABASE_TABLE, columns, where , selectArgs, null, null, null);

            cur.moveToFirst();
            //循环读取数据
            while(!cur.isAfterLast()){
                Map<String , String> stockMap = new HashMap<String , String>();
                String code =  cur.getString(0);
                String name =  cur.getString(1)+"("+code+")";
                stockMap.put("code" , code);
                stockMap.put("name" , name);
                stockList.add(stockMap);
                cur.moveToNext();
            }
            cur.close();
            close();
            return stockList;
        }
        return null;
    }