将android程序中的数据库导出到SD卡

孤风一剑 9月 02, 2014 219 0

private void copyDBToSDcrad()
{
String DATABASE_NAME = “数据库文件名称”;
String oldPath = “data/data/com.packagename/databases/” + DATABASE_NAME;
String newPath = Environment.getExternalStorageDirectory() + File.separator + DATABASE_NAME;
copyFile(oldPath, newPath);
}
/**
* 复制单个文件
*
* @param oldPath
* String 原文件路径
* @param newPath
* String 复制后路径
* @return boolean
*/
public static void copyFile(String oldPath, String newPath)
{
try
{
int bytesum = 0;
int byteread = 0;
File oldfile = new File(oldPath);
File newfile = new File(newPath);
if (!newfile.exists())
{
newfile.createNewFile();
}
if (oldfile.exists())
{ // 文件存在时
InputStream inStream = new FileInputStream(oldPath); // 读入原文件
FileOutputStream fs = new FileOutputStream(newPath);
byte[] buffer = new byte[1444];
while ((byteread = inStream.read(buffer)) != –1)
{
bytesum += byteread; // 字节数文件大小
fs.write(buffer, 0, byteread);
}
inStream.close();
}
}
catch (Exception e)
{
System.out.println(“复制单个文件操作出错”);
e.printStackTrace();
}
}

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