android sqlite 中文乱码。劳驾详细点

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;	}}