android sqlite 中文乱码。。麻烦详细点

package cn.reciteWord.operation;

import android.content.ContentValues;



import android.content.Context;

import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/*
 *  创建数据库
 */
public class MyDataBaseAdapter {
	
	public static String DB_NAME = "vocabulary.db";
	public static String ID = "_id";
	public static String CHA = "chinese";
	public static String ENG = "english";
	private static String tableName = "vocabulary";
	private static int version = 1;
	private static final String DB_CREATE = "CREATE TABLE IF NOT EXISTS " + tableName + " (" + ID + " INTEGER PRIMARY KEY," + CHA + " TEXT," + ENG + " TEXT)";
	private Context mContext = null;
	
	private SQLiteDatabase mSqLiteDatabase = null;		//保存返回的数据库对象
	private DataBaseHelper mDataBaseHelper = null;
	
	private static class DataBaseHelper extends SQLiteOpenHelper {

		
		public DataBaseHelper(Context context) {
			super(context, DB_NAME, null, version );
			// TODO Auto-generated constructor stub
		}
	
		@Override
		public void onCreate(SQLiteDatabase db) {
			// TODO Auto-generated method stub
			db.execSQL(DB_CREATE);
			
		}
	
		@Override
		public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
			// TODO Auto-generated method stub
			// 删除以前的旧表，创建一张新的空表  
	        db.execSQL("DROP TABLE IF EXISTS " + DB_NAME);  
	        onCreate(db);  
	        
		}
	
	}

	public MyDataBaseAdapter(Context context) {
		// TODO Auto-generated constructor stub
		mContext = context;
	
	}
	
	//打开数据库, 返回数据库对象
	public void open() throws SQLException{
		mDataBaseHelper = new DataBaseHelper(mContext);
		
	}
	
	//关闭数据库
	public void close() {
		mDataBaseHelper.close();
	}
	
	public long insertData(String en, String ch) {	
		// 插入数据
		mSqLiteDatabase = mDataBaseHelper.getWritableDatabase();
		ContentValues mContentValues = new ContentValues();
		mContentValues.put(ENG, en);
		mContentValues.put(CHA, ch);
		
		return mSqLiteDatabase.insert(tableName, ID, mContentValues);
		
	}
	
	public boolean deleteData(long rowID) {
		// 删除一条数据
		mSqLiteDatabase = mDataBaseHelper.getWritableDatabase();
		return mSqLiteDatabase.delete(tableName, ID + "=" + rowID, null) > 0;
		
	}
	
	public Cursor fetchAllData() {
		//查询所有数据
		mSqLiteDatabase = mDataBaseHelper.getWritableDatabase();
		return mSqLiteDatabase.query(tableName, new String[] {ID, ENG, CHA}, null, null, null, null, null);
	}
	
	public Cursor fetchData(long rowID)throws SQLException {
		mSqLiteDatabase = mDataBaseHelper.getWritableDatabase();
		Cursor cursor = mSqLiteDatabase.query(true, tableName, new String[] {ID, ENG, CHA}, ID + "=" + rowID, null, null, null, null, null);
		
		if(cursor != null) {
			cursor.moveToFirst();
		}
		return cursor;
	}
	
	public boolean updateData(long rowId, String en, String ch) {
		//更新一条数据
		mSqLiteDatabase = mDataBaseHelper.getWritableDatabase();
		ContentValues mContentValues = new ContentValues();
		mContentValues.put(ENG, en);
		mContentValues.put(CHA, ch);
		return mSqLiteDatabase.update(tableName, mContentValues, ID + "=" + rowId, null) > 0;
	}
}