android eclipse 将项目中assets文件夹下的数据库文件存储到data/data/包名/databases下

本是古典何须时尚 2022-08-20 12:22 2阅读 0赞

android eclipse 将项目中assets文件夹下的数据库文件存储到data/data/包名/databases下：

public SQLiteDatabase openDatabase()
        {
            String pathFile = "data/data/com.example/databases/clearpath.db";//数据库存储路径； 
            String pathMdkir = "data/data/com.example/databases";//数据库存储文件夹； 
            File path = new File(pathFile);
            //判断文件是否已经生成，如果存在就直接返回数据；
            if(path.exists())
            {
                SQLiteDatabase db=SQLiteDatabase.openOrCreateDatabase(path, null);
                return db;
            }
            else
            {
                File path1 = new File(pathMdkir);
                if(path1.mkdir())
                {
                    System.out.println("创建成功");
                }
                else
                {
                    System.out.println("创建失败");
                }
            }
            BufferedInputStream bis = null;
            BufferedOutputStream bos = null;
            try {
                bis = new BufferedInputStream(context.getAssets().open("clearpath.db"));
                bos = new BufferedOutputStream(new FileOutputStream(pathFile));
                int len;
                byte[] b = new byte[1024];
                while((len = bis.read(b)) != -1)
                {
                    bos.write(b, 0, len);
                    bos.flush();
                }
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally
            {
                if(bis != null)
                {
                    try {
                        bis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if(bos != null)
                {
                    try {
                        bos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return openDatabase();
        }