Textwatcher和SQLite,ListView集合的基本用法或许有用

两个xml文件

main.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/tv" 

               android:layout_width="fill_parent"   

               android:layout_height="wrap_content" 

               android:textColor="@android:color/white"  

               android:ellipsize="marquee"     android:focusable="true"

               android:marqueeRepeatLimit="marquee_forever"   

               android:focusableInTouchMode="true" 

               android:scrollHorizontally="true"   

               android:text="Please input the text:"    />

         <EditText android:id="@+id/ET"  

                android:hint="请输入要查询的信息" 

                android:layout_width="match_parent" 

                android:layout_height="wrap_content"  />

     

      <ListView android:id="@+id/lv"

               android:layout_width="match_parent" 

                android:layout_height="wrap_content"  >

           </ListView>

 

</LinearLayout>

listadapter.xml

<?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="fill_parent"  

                 android:orientation="horizontal" >

       

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  

                android:orientation="vertical"

                 android:layout_width="fill_parent"

                 android:layout_height="30px"    >

     

      <TextView android:id="@+id/tv12"

                android:layout_width="fill_parent"

                android:layout_height="15px" />

         

      <TextView android:id="@+id/tv11"

                android:layout_width="fill_parent"

                android:layout_height="15px" />

   </LinearLayout>     

</LinearLayout>

主Activity

package ntc.textwatcher;

 

import java.util.ArrayList;

import java.util.List;

import ntc.textwatcher.jdbc.BaseSqliteHelper;

import ntc.textwatcher.jdbc.sql;

import ntc.textwatcher.model.Cys;

import android.app.Activity;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

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.BaseAdapter;

import android.widget.EditText;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.Toast;

public class TextWatcherActivity extends Activity {

    /** Called when the activity is first created. */

  private TextView mTextView;

  private EditText mEditText;  

private  BaseSqliteHelper base=new BaseSqliteHelper(this);      //BaseSqliteHelper 自己写的类获取BaseSqliteHelper的实例

  private  SQLiteDatabase db;             //获取数据库的实例

  

 List<Cys> list=new ArrayList<Cys>();        //model 文件夹下的自己写的类Cys

  ListView lv=null;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        mTextView = (TextView)findViewById(R.id.tv);     

        mEditText = (EditText)findViewById(R.id.ET);      

      mEditText.addTextChangedListener(mTextWatcher);

       

        db=base.getWritableDatabase();//用于调用BaseSQLiteHelper中的onCreate方法，主要是创建数据库和表格，版本的更新等等

        

     

    }     

 

      private    TextWatcher   mTextWatcher=new TextWatcher(){

                  private CharSequence temp;    

                  private int editStart ;     //开始输入时

                  private int editEnd ;     //结束输入时

  

       

         

       

  public void beforeTextChanged(CharSequence s, int start, int count,

    int after) {

   // TODO Auto-generated method stub

    temp=s;     //输入text前s赋给temp

  }

  public void onTextChanged(CharSequence s, int start, int before,

    int count) {

    mTextView.setText(s);

     //输入时 s赋给Text

  

} 

  

   

        public void afterTextChanged(Editable s) {

//输入后

         

         editStart=mTextView.getSelectionStart();

         editEnd=mTextView.getSelectionEnd();

         if(temp.length()>10){

        Toast.makeText(TextWatcherActivity.this,  "你输入的字数已经超过了限制！", Toast.LENGTH_SHORT).show();      

        s.delete(editStart-1, editEnd);           

        int tempSelection = editStart;            

        mEditText.setText(s);           

        mEditText.setSelection(tempSelection);

  }

       String m=  s.toString() ;

         String[] ss= m.split(":");

     

        lv=(ListView)findViewById(R.id.lv);

        

    list= new sql(base).query(ss);

//    

//    

     lv.setAdapter(new adapter(TextWatcherActivity.this,list));

    

        }

       

    };

    

       class adapter extends BaseAdapter{   //listview的适配器

     

     List<Cys> list=null;

     

     LayoutInflater inflater=null;

     

     public adapter(Context context,List<Cys> list)    //构造函数

     {

      this.list=list;

         inflater=LayoutInflater.from(context);         //获取上下文将其转换为布局

         }

      public int getCount() {

   // TODO Auto-generated method stub

   return list.size();

  }

  public Object getItem(int position) {

   // TODO Auto-generated method stub

   return list.get(position);

  }

  public long getItemId(int position) {

   // TODO Auto-generated method stub

   return position;

  }

  public View getView(int position, View convertView, ViewGroup parent) {

   // TODO Auto-generated method stub

  

   convertView=inflater.inflate(R.layout.listadapter, null);    

   //final int id=contentview.;

     TextView tv1=(TextView)convertView.findViewById(R.id.tv12);

     TextView tv2=(TextView)convertView.findViewById(R.id.tv11);

   

   

     tv1.setText( list.get(position).getName());

           tv2.setText(list.get(position).getFirstname());

            

     return convertView;

  }

      }

}

model包下的Cys类

package ntc.textwatcher.model;

public class Cys {

 

 private String name;

 private String firstname;

 public String getName() {

  return name;

 }

 public void setName(String name) {

  this.name = name;

 }

 public String getFirstname() {

  return firstname;

 }

 public void setFirstname(String firstname) {

  this.firstname = firstname;

 }

 

 public Cys(String name,String firstname)

 {

  

  

  this.name=name;

  this.firstname=firstname;

 }

 

}

数据库交互的jdbc包

package ntc.textwatcher.jdbc;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;

public class BaseSqliteHelper extends SQLiteOpenHelper {

 

 private final static String DB_NAME="student.db";

 private final static int DB_VERSION=1;        //可以更新版本通过Update类

  private Context context;

 

 

 

 public BaseSqliteHelper(Context context) {

  super(context, DB_NAME, null, DB_VERSION);

  // TODO Auto-generated constructor stub

  

  //VERSION=2

  

  //create table tblStudent (sid int primary key, sname varchar(10), sage int)；

  

  }

  

 

 

 

 

 @Override

 public void onCreate(SQLiteDatabase db) {

  // TODO Auto-generated method stub

  //VERSION=1

  db.execSQL("create table tblStudent (sid int primary key, sname varchar(10))");

  db.execSQL("insert into tblStudent values (1, 'Tom')");

  db.execSQL("insert into tblStudent values (2, 'Sam')");

      System.out.println("run init");

 }

 @Override

 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

  // TODO Auto-generated method stub

//  db.beginTransaction();//事务注意

//  try{

//  db.execSQL("alter table tblStudent rename to tblStudentTemp");

//  db.execSQL("create table tblStudent (sid int primary key, sname varchar(10), sage int)");

//  db.execSQL("insert into tblStudent (sid, sname, sage) select sid, sname, 18 from tblStudentTemp");

//  db.execSQL("drop table tblStudentTemp");

//     System.out.println("run update");

//     db.setTransactionSuccessful();

//     }

//  finally{

//     db.endTransaction();}

 }

 

}

 

//sql语句类

package ntc.textwatcher.jdbc;

import java.util.ArrayList;

import java.util.List;

import ntc.textwatcher.model.Cys;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

public class sql {

 

 

 private static BaseSqliteHelper helper;

 

 

 public sql(BaseSqliteHelper helper)

 {

  this.helper=helper;

  

 }

 

 

 

 public static List<Cys>  query(String[] ss)

 {

  

  List<Cys> list=new ArrayList<Cys>();

  Cursor cursor=null;

 SQLiteDatabase db=  helper.getReadableDatabase();

  for(String ll:ss)

  {

    String s="%"+ll+"%";

   

   

     cursor=db.rawQuery("select * from tblStudent where  ( sname like  ? or sid like ?)",new String[]{s,s});

  

  //用or语句，必须上面这样new String【】{}，其实query(String[] ss)的ss就是一个String

  

  

  while(cursor.moveToNext())

  {  String sname=cursor.getString(cursor.getColumnIndex("sid"));

    String sfirstname=cursor.getString(cursor.getColumnIndex("sname"));

    Cys cys=new Cys(sname,sfirstname);

   

   list.add(cys);

    

  }}

   

  return list;

  

  }

 

 

 

 public Boolean insert(Cys cys)

 {

    

  try{

  

  SQLiteDatabase db=helper.getWritableDatabase();

  db.execSQL("inset into tblStudent values(?,?)",new Object[]{cys.getName(),cys.getFirstname()});

  

  }catch(Exception e)

  {

   return false;

   

   

   

  }  

  

  

  return true;

  

  

 }

 

}