import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import com.bzu.qilu.R;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.os.Environment;
import android.util.Log;
/**数据库管理类* @author 刘齐鲁*date 2016-5-20*/public class DBOpenHelper {private final int BUFFER_SIZE = 400000;//缓冲区大小public static final String DB_NAME="idioms.db";//保存的数据库文件名public static final String PACKAGE_NAME="com.bzu.qilu";//应用包名public static final String DB_PATH="/data"+ Environment.getDataDirectory().getAbsolutePath()+"/"+ PACKAGE_NAME+"/databases";//在手机里存放数据库的位置private Context context;public DBOpenHelper(Context context){this.context=context;}//打开数据库public SQLiteDatabase openDatabase(){try{File myDataPathFile = new File(DB_PATH);//if(!myDataPathFile.exists()){myDataPathFile.mkdir();//如果没有这个目录则创建
           }String dbfile = myDataPathFile+"/"+DB_NAME;if(!(new File(dbfile).exists())){//判断数据库文件是否存在，若不存在则执行导入，否则直接打开数据库InputStream is = context.getResources().openRawResource(R.raw.idioms);FileOutputStream fos = new FileOutputStream(dbfile);byte[] buffer = new byte[BUFFER_SIZE];int count = 0;while((count =is.read(buffer))>0){fos.write(buffer,0,count);}fos.close();is.close();}SQLiteDatabase db =SQLiteDatabase .openOrCreateDatabase(dbfile, null);return db;}catch(FileNotFoundException e){Log.e("Database", "File not found");e.printStackTrace();}catch(IOException e){Log.e("Database", "IO exception");e.printStackTrace();}return null;}
}

public class DBOpenHelperTest extends AndroidTestCase {public void testDBCopy(){DBOpenHelper dbOpenHelper = new DBOpenHelper(getContext());dbOpenHelper.openDatabase();}
}