android SQLite(单词的添加与查询应用)

本人小白，刚接触android，为方便记忆，将平时练习的代码写下来，跟大家分享，也希望大神批评指正。

这个实例主要用到的SQLite数据库的操作，可以向数据库添加单词，查询，修改以及删除单词，描述如有不当之处，还请帮忙纠正，下面上源码。

------------------------------------------我是邪恶的分割线----------------------------------------------

下面是java文件

1.创建数据库：

　　

 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;

 public class DatabaseHelper extends SQLiteOpenHelper {

     //定义创建数据表的语句
     private static final String CREATE_TABLES="create table word_dic(_id INTEGERT PRIMARY KEY AUTOINCREMENT,word,detail)";

     //定义构造函数
     public DatabaseHelper(Context context,String name,int version){
         super(context,name,null,version);
     }
     @Override
     public void onCreate(SQLiteDatabase db) {
         // TODO Auto-generated method stub
         db.execSQL(CREATE_TABLES);
     }

     @Override
     public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
         // TODO Auto-generated method stub

     }

 }

2.创建界面UI

　　

 import java.util.ArrayList;
 import java.util.HashMap;

 import android.app.Activity;
 import android.content.ContentValues;
 import android.content.Intent;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Toast;

 public class MainActivity extends Activity {
     private EditText word;
     private EditText detail;
     private Button insert;
     private Button query;
     private Button update;
     private Button delete;
     DatabaseHelper dbHelper=null;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

         //获取控件对象
         word=(EditText)findViewById(R.id.word);
         detail=(EditText)findViewById(R.id.detail);
         insert=(Button)findViewById(R.id.insert);
         query=(Button)findViewById(R.id.query);
         update=(Button)findViewById(R.id.update);
         delete=(Button)findViewById(R.id.delete);

         //生成DatabaseHelper对象
         dbHelper=new DatabaseHelper(MainActivity.this,"english_db",1);

         //两个EditText用来获取用户的输入
         //String wordStr=word.getText().toString();
         //String detailStr=detail.getText().toString();

         //**************************
         //为按钮绑定相应的监听器
         //**************************

         //添加单词
         insert.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 SQLiteDatabase db=dbHelper.getWritableDatabase();
                 String wordStr=word.getText().toString();
                 String detailStr=detail.getText().toString();
                 ContentValues values=new ContentValues();
                 values.put("word", wordStr);
                 values.put("detail", detailStr);
                 db.insert("word_dic", null, values);
                 Toast.makeText(MainActivity.this, "添加单词成功", Toast.LENGTH_LONG).show();
             }
         });

         //查询单词
         query.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 SQLiteDatabase db=dbHelper.getReadableDatabase();
                 String wordStr=word.getText().toString();

                 Cursor cursor=db.query("word_dic", new String[]{"_id","word","detail"}, "word like ?",
                         new String[]{wordStr},null, null, null);
                 ArrayList<HashMap<String, String>> list=new ArrayList<HashMap<String,String>>();
                 while(cursor.moveToNext()){
                     HashMap<String, String> map=new HashMap<String, String>();
                     map.put("word", cursor.getString(cursor.getColumnIndex("word")));
                     map.put("detail", cursor.getString(cursor.getColumnIndex("detail")));
                     list.add(map);
                 }
                 Intent intent=new Intent(MainActivity.this,OtherActivity.class);
                 Bundle bundle=new Bundle();
                 bundle.putSerializable("data", list);
                 intent.putExtras(bundle);
                 startActivity(intent);
             }
         });

         //修改单词
         update.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 SQLiteDatabase db=dbHelper.getWritableDatabase();
                 String wordStr=word.getText().toString();
                 String detailStr=detail.getText().toString();
                 ContentValues values=new ContentValues();
                 values.put("word", wordStr);
                 values.put("detail", detailStr);
                 db.update("word_dic", values, "word like ?", new String[]{wordStr});
                 Toast.makeText(MainActivity.this, "单词已更新", Toast.LENGTH_LONG).show();
             }
         });

         //删除单词
         delete.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 SQLiteDatabase db=dbHelper.getWritableDatabase();
                 String wordStr=word.getText().toString();

                 db.delete("word_dic", "word like ?", new String[]{wordStr});
                 Toast.makeText(MainActivity.this, "单词已删除", Toast.LENGTH_LONG).show();
             }
         });
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

 }

3.创建查询结果的ACTIVITY:

　　

 import java.util.ArrayList;
 import java.util.HashMap;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.widget.ListView;
 import android.widget.SimpleAdapter;

 public class OtherActivity extends Activity {
     private ListView listView;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
         setContentView(R.layout.result);

         listView=(ListView)findViewById(R.id.listView);
         Intent intent=getIntent();
         Bundle bundle=intent.getExtras();

         @SuppressWarnings("unchecked")
         ArrayList<HashMap<String, String>> list=(ArrayList<HashMap<String,String>>)bundle.getSerializable("data");
         SimpleAdapter adapter=new SimpleAdapter(this, list, R.layout.option, new String[]{"word","detail"},
                 new int[]{R.id.wordShow,R.id.detailShow});
         listView.setAdapter(adapter);
     }

 }

*********************************以下是用到的资源文件*********************************************

1.main.xml:

 <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent" >
     <TableRow android:paddingLeft="10dp">
         <TextView
             android:layout_width="50dp"
             android:layout_height="wrap_content"
             android:text="单词:"
             android:textSize="16sp"
             />
         <EditText
             android:id="@+id/word"
             android:layout_width="250dp"
             android:layout_height="wrap_content"
             android:selectAllOnFocus="true"
             android:hint="请输入单词"
             />
     </TableRow>
     <TableRow android:paddingLeft="10dp">
         <TextView
             android:layout_width="50dp"
             android:layout_height="wrap_content"
             android:text="释意:"
             android:textSize="16sp"
             />
         <EditText
             android:id="@+id/detail"
             android:layout_width="250dp"
             android:layout_height="wrap_content"
             android:selectAllOnFocus="true"
             android:hint="请输入单词的解释"
             />
     </TableRow>
     <Button
         android:id="@+id/insert"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="添加单词"
         />
     <Button
         android:id="@+id/query"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="查询单词"
         />
     <Button
         android:id="@+id/update"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="修改单词"
         />
     <Button
         android:id="@+id/delete"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="删除单词"
         />
 </TableLayout>

2.result.xml:

　　

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical" >

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

 </LinearLayout>

3.option.xml:

　　

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent" >

     <TextView
         android:id="@+id/wordShow"
         android:layout_width="100dp"
         android:layout_height="wrap_content"
         android:layout_alignParentLeft="true"
         android:layout_alignParentTop="true"
         />

     <TextView
         android:id="@+id/detailShow"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentRight="true"
         android:layout_alignParentTop="true"
         android:layout_toRightOf="@+id/wordShow"
         />

 </RelativeLayout>